Course

KASUN WICKRAMASINGHE

The thesis can be summarised as an exercise in linking the theoretical knowledge of Nickel Titanium Shape Memory Alloys to a practical space. Background work includes establishing a thorough understanding of the behaviour of Shape Memory Alloys, locating the opportunities for actuation available in gas turbine engines, and evaluating past studies that utilise SMA technologies in aerospace applications. Using this knowledge base, an experimental methodology is devised, focused on assessing criteria specifically related to SMA actuation demands. FEM techniques are employed, using data from the experimental study, to develop and analyse SMA actuator concepts. The culmination of these various streams of work effects the conceptualization of a novel solid-state flexural actuator for the gas turbine engine variable stator vane assembly.

Rahul Ranjan Mohanta

This document serves as an introductory guide to physical metallurgy and material engineering aimed at B. Tech students in their fourth semester. The objective is to provide comprehensive insights into the classification of engineering materials, properties, and the principles governing their behavior under various conditions. The methodology incorporates theoretical concepts such as atomic bonding, crystal structures, and phase diagrams, allowing students to grasp the foundational knowledge necessary for understanding materials science. Results are derived from synthesizing information from various academic and freely available resources, ensuring that critical topics such as plastic deformation of metals, alloy formation, and the implications of heat treatment on material properties, including strength and toughness, are covered extensively. This educational tool emphasizes the significance of alloys in various applications, highlighting their enhanced properties that are essential for high-performance uses in industries such as aerospace and automotive. The document may be utilized as a supplementary resource in conjunction with traditional textbooks, thereby enriching the teaching-learning process in metallurgical education.

Avala Lava Kumar

The course on Physical Metallurgy aims to provide students with a comprehensive introduction to the fundamental principles governing the behavior and properties of metals. The objective is to equip students with a systematic understanding of crystal structures, phase diagrams, solidification, and various metallurgical processes. Through an organized methodology that encompasses both theoretical insights and practical applications, the module covers crucial topics including diffusion, microstructure, and the mechanical properties of metals. Key learning outcomes include the ability to critically evaluate phase diagrams and transformation processes, as well as an understanding of the relationship between microstructure and engineering properties of metallic materials. The systematic exploration of alloy types, heat treatment processes, and their relevance to real-world engineering problems further enhances students' awareness of current issues in the field. By connecting these principles to practical scenarios, the course seeks to foster a critical awareness of how to exploit structural alloys in various applications. Overall, the module provides essential knowledge that is vital for those pursuing further studies and careers in metallurgical and materials engineering.

G. Dieter

This lecture covers the principles of mechanical metallurgy focusing on the mechanisms of cold working and annealing in materials. The objective is to explain the effects of dislocation movements and how they influence the mechanical properties of metals. The methodology involves reviewing temperature effects on the stress-strain curve, discussing the role of dislocation climb in ductility enhancement, and delineating the stages of annealing which include recovery, recrystallization, and grain growth. Results show that cold working increases tensile strength and yield strength while decreasing ductility, alongside notable changes in electrical conductivity and chemical reactivity. In the recovery stage, there is a restoration of physical properties without structural changes, while recrystallization replaces the cold worked structure with new strain-free grains, effectively reducing dislocation density and restoring ductility. The lecture emphasizes the non-fixed nature of recrystallization temperature depending on multiple influencing factors. This thorough analysis provides insight into the complex behavior of materials under mechanical stress and subsequent treatment processes.

Avala Lava Kumar

This document provides a comprehensive overview of the course on Physical Metallurgy, aimed at equipping students with a systematic introduction to the subject. The objective is to facilitate a critical understanding of the roles that various structural concepts play in the properties of materials, focusing on crucial aspects such as crystal structures, solidification processes, and phase diagrams. The methodology implemented in this course covers key topics including diffusion, liquid to solid transformations, and the behavior of ferrous and non-ferrous materials, emphasizing their relevance to contemporary engineering applications. The educational framework is designed to cultivate students' abilities to critically analyze the interplay between microstructure, processing techniques, and the resulting mechanical properties in metals. Through completion of the course, students are expected to demonstrate thorough comprehension of both the theoretical and practical dimensions of physical metallurgy, thereby addressing current challenges in the field. This systematic approach ensures that learners develop the necessary skills to engage effectively in the design and utilization of structural alloys in engineering contexts.

Dr. Swarnalata Behera

Dr. Swarnalata Behera

This lecture note outlines the fundamentals of physical metallurgy, emphasizing the importance of crystalline structures, phase diagrams, and the mechanical properties of various steel alloys. The objective is to provide a comprehensive understanding of the principles governing the microstructure and performance of metallic materials. Employing a structured lesson plan, the methodology includes weekly theoretical topics covering crystal structures, defects, and phase changes, with specific focus on equilibrium diagrams for binary and complex alloys. Results from this educational framework demonstrate the critical considerations for alloy design, addressing how heat treatments influence the strength and ductility of low and high-carbon steels. The note also discusses the applications of these materials in industries ranging from construction to aerospace, highlighting the versatility of steel in modern engineering. By intertwining theoretical knowledge with practical examples, the note serves as a vital resource for students in metallurgical engineering disciplines.

Avala Lava Kumar, Suneeti Purohit

The course on Physical Metallurgy aims to provide students with a comprehensive understanding of the fundamental principles governing metallic materials used in engineering applications. The objective of this module is to cover essential topics such as crystal structures, solidification processes, phase diagrams, and material transformations, which are pivotal for grasping the behavior of alloys under different conditions. Methodologically, the course employs systematic teaching strategies, incorporating theoretical concepts and practical case studies to enhance the learning experience. By evaluating key areas like diffusion, defects, and processing parameters, students will develop a critical awareness of how these principles relate to current challenges in alloy design and exploitation. Results from the course indicate that students achieve a sound understanding of microstructure and its influence on material properties, preparing them for advanced studies and professional practice in the field of materials engineering. Upon successful completion, students are equipped with the skills to make informed decisions regarding the selection and processing of alloys in real-world applications.

Avala Lava Kumar, Suneeti Purohit

This document provides a comprehensive introduction to the field of Physical Metallurgy, specifically designed for B.Tech students in the 3rd semester. The objective is to familiarize students with essential concepts such as crystal structures, solidification processes, equilibrium phase diagrams, transformation diagrams, diffusion, and the characteristics of ferrous and non-ferrous materials. Methodologically, the course integrates theoretical frameworks with practical applications to elucidate key principles. The systematic overview covers a range of topics, including cold work, recovery, and recrystallization, emphasizing their relevance in exploiting structural alloys within engineering contexts. Upon completion, students will demonstrate not only a systematic understanding of crystal structures and phase diagrams but also possess the ability to critically evaluate their significance in relation to real alloys and their microstructures. Additionally, the course aims to instill a robust awareness of key concepts such as diffusion and transformation types while exploring their implications for designing and processing metallic materials. Results indicate that successful participants will be well-equipped to address contemporary challenges in material science, particularly concerning the interplay between microstructure, processing, and engineering properties.

Dr. Sisira Kanta Pattnaik

This lecture notes document provides a comprehensive overview of physical metallurgy and engineering, specifically aimed at students in their 4th semester of the Mechanical Engineering program. The objective is to facilitate understanding of the evolution of structures in metals and alloys from their liquid state, considering the influence of alloy elements, impurities, and processing techniques on transformation processes. The methodology entails a systematic exploration of fundamental concepts, including atomic and crystal structure, mechanical properties, phase diagrams, and heat treatment processes. Key findings highlight the relationship between material structure, processing, and resultant properties, emphasizing the importance of materials selection in engineering applications. The teachings encapsulate principles that guide the engineering of materials to achieve desired performance characteristics, culminating in a holistic perspective of material behavior in service conditions. The approach taken in this document aims to equip students with essential knowledge and skills necessary to navigate the complexities of materials engineering.

Prof. Pravata Ranjan Kaunr

This document serves as a comprehensive introduction to the field of physical metallurgy and engineering materials, highlighting the essential properties and classifications of various materials used in engineering. The primary objective is to equip students with foundational knowledge through detailed lecture notes covering multiple modules. The methodology involves systematic exploration of topics such as bonding in solids, plastic deformation of metals, alloy formation, and phase diagrams. Results include an in-depth understanding of critical concepts like dislocation theory, heat treatment of steels, and the characteristics of different alloys and composite materials. Additionally, the notes address practical applications of materials, including sandwich structures and laminar composites, emphasizing their design benefits such as strength, weight reduction, and corrosion resistance. This structured approach aims to foster a robust comprehension of engineering materials for students pursuing degrees in mechanical engineering and related disciplines.

PETER JAMES SQUIRE

This study focuses on the development of a new alloy system capable of forming metallic glass upon rapid solidification, rather than modifying existing glass-forming compositions. The objective is to examine the glass-forming ability of an iron-based system, leveraging the cost-effectiveness of iron compared to traditional base elements in metallic glasses. A ternary alloy system comprised of iron, carbon, and boron was selected, with manganese and molybdenum included as secondary alloying elements to assess their impact on glass formation. Methodologically, a diverse range of characterization techniques—including optical microscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffractometry, secondary ion mass spectroscopy, and differential scanning calorimetry—were utilized to analyze both the microstructural features and thermal behavior of the alloys. The results indicate that the ability of the iron-based alloys to achieve vitrification on rapid solidification is not predictable based on the as-cast microstructure or computational models, with successful glass formation occurring only in compositions near a eutectic point, highlighting the complexities associated with stabilizing supercooled liquids in these systems.

PETER JAMES SQUIRE

This study focuses on developing a new alloy system capable of forming a metallic glass upon rapid solidification, diverging from traditional modifications of known glass forming compositions. Iron was selected as the base element due to its lower cost compared to other metallic glass bases, eliminating the need for expensive alloying elements for vitrification. The research began with a ternary system consisting of carbon and boron, which are recognized for enhancing glass formation. Secondary alloying elements, manganese and molybdenum, were introduced to evaluate their influence on the glass forming ability of the iron-carbon-boron alloy. A range of advanced characterization techniques, including optical microscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffractometry, and secondary ion mass spectroscopy, were employed to analyze the microstructure of the as-cast and rapidly solidified alloys, while differential scanning calorimetry (DSC) was utilized to assess their thermal behavior. The findings revealed that the ability of the iron-based alloys to form a glass upon rapid solidification could not be anticipated based solely on the examination of as-cast microstructures or computational methods. Successful vitrification was contingent upon the compositions being near a eutectic point.

William Shockley, John Bardeen

This document explores the evolution of materials science, tracing its roots from prehistoric tool-making to modern advancements in nanoscience and technology. The objective is to provide a comprehensive overview of significant milestones in materials and their applications in various engineering fields. The methodology involves a chronological presentation of historical advancements alongside key inventions, such as the transition from the Bronze Age to modern metallurgy, and the development of semiconductor technologies, particularly the invention of the transistor at Bell Labs. Results indicate that the evolution of materials science has been pivotal in shaping technological progress, emphasizing the importance of understanding atomic scale structures and their influence on mechanical, electrical, optical, and thermal properties of materials. The document concludes with a call for continued exploration and mastery of materials science principles as the foundation for future innovations in engineering and technology.

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This document provides an overview of materials science and its historical context, detailing significant milestones and advancements from the formation of the solar system to the development of modern nanotechnology. The primary objective is to illustrate the evolution of materials and their properties, focusing on key periods such as the Bronze Age, the invention of the transistor, and the advent of the Silicon Age. Methodologically, it utilizes a chronological approach to discuss the transition from basic tools made of native metals to complex alloys and modern semiconductor technology. The results highlight the enduring relevance of materials science in addressing contemporary technological challenges, as well as its foundational role in various engineering disciplines. The text emphasizes the need for understanding atomic-scale structures and their influence on the mechanical, electrical, optical, and thermal properties of materials, culminating in practical laboratory experiences to bridge theory with hands-on application.

This document outlines the objectives and detailed contents of the PC4306 Physical Metallurgy course, which aims to teach students about the principles of alloy design, phase diagrams, and the strengthening mechanisms in various metals and alloys. The course content is structured into four modules, covering important topics such as phase changes in unary and binary systems, solidification mechanisms, conventional heat treatment processes, and a wide range of ferrous and non-ferrous alloys. Special attention is given to the influence of heat treatment on material properties, as well as the phenomena of solid-state transformations, including age hardening and martensitic changes. The course also emphasizes the significance of grain size and boundary effects on the strength and toughness of alloys, supported by discussions on the Hall-Petch equation. By engaging with these fundamental concepts, students will gain a comprehensive understanding of physical metallurgy, enabling them to apply this knowledge in engineering contexts.

The course PC4306 in Physical Metallurgy is designed to impart knowledge on principles of alloy design, phase diagrams, and the various strengthening mechanisms applicable to different metals and alloys. The primary objective is to explore the fundamental aspects of heat treatment processes and their effects on properties and practical applications of materials. The methodology includes a detailed examination of phase changes in unary and binary systems, significant phase diagrams including those relevant to metallic and ceramic systems, and various solidification mechanisms. Additionally, the course covers essential concepts like TTT and CCT diagrams, conventional heat treatment techniques such as annealing and hardening, and the role of alloying elements in enhancing the characteristics of ferrous and non-ferrous alloys. The results highlight the importance of understanding microstructural changes, grain size effects, and the role of heat treatment in determining the mechanical properties of materials. The insights gained from this course are crucial for the application of physical metallurgy in engineering contexts.

SHENG LI

This thesis focused on the development of Ti-Ni-based shape memory alloys (SMA) using a novel alloy development process based on laser melting technique, suspended droplet alloying (SDA), and on development of a manufacturing route for Ti-Ni-based structures using selective laser melting (SLM), specifically for negative Poisson’s ratio (NPR) auxetic structures. To assess the SDA process, a series of Ti-Ni-based binary, ternary and quaternary shape memory alloys (SMA) have been built to analyse the chemical and microstructural homogeneity of the builds produced by the SDA process. The shape memory performance in terms of the transformation temperature, thermal stability and thermo-mechanical stability was also investigated and compared with commercial SMA and literature. It proved that the SDA built sample was comparable to the bulk SMA prepared by other alloy development processes. To assess the processability of Ti-Ni-based alloys, SLM process parameters were optimised for Ti-Ni SMA and the SMA NPR structure was built for mechanical testing. It was found that the SLM process parameters can severely alter the microstructure and shape memory properties due to different cooling rates and Ni vaporisation. Finally, TiNiCuNb and TiNiHfCuNb alloys were developed using SDA to improve the shape memory properties by altering the precipitates.

Wei Hu, Krishna Rajan

This thesis explores data-driven methodologies for metallurgical design aimed at enhancing the performance of high strength low alloy (HSLA) steels. The objective is to develop models that predict the mechanical properties of HSLA steel by utilizing multivariate data. The research employs techniques such as linear regression, artificial neural networks, and recursive partitioning to analyze input variables and their interactions. Through comprehensive data collection and model evaluation, the study identifies critical factors influencing yield strength and ultimate tensile strength of HSLA steels. The results indicate that the integrated modeling approach can significantly improve the predictive accuracy of steel property outcomes. Insights gained from this research have considerable implications for advancing metallurgical design practices and optimizing the material properties of HSLA steels for various industrial applications.

Wei Hu

This thesis presents a data-driven approach to the design of high strength low alloy (HSLA) steel, focusing on metallurgical properties and modeling techniques. The objective is to enhance HSLA steel's performance by employing advanced data mining and modeling strategies. A comprehensive methodology is developed, incorporating linear regression models, artificial neural networks, and recursive partitioning techniques to evaluate various properties of HSLA steel. The results indicate significant improvements in yield strength and overall material performance through the application of these methods. This study contributes to the field of materials science by demonstrating the potential of data-driven approaches in optimizing steel design, thereby providing valuable insights for future research and industrial applications.

Yanheng Xie

Advances in lightweight structural materials have intensified interest in magnesium alloys, particularly those strengthened by Zn, Ca, and Ag additions. This research presents a comprehensive study of the thermodynamic and kinetic behaviour of Mg-Zn-Ca and Mg-Zn-Ca-Ag alloys using an integrated CALPHAD-based modelling and experimental approach. The solidification process is analysed using an extended Scheil model, capturing non-equilibrium phase evolution and solute segregation during casting. A mean-field model is developed to simulate the nucleation, growth, and coarsening of strengthening phases during heat treatment, enabling the prediction of precipitate evolution over time. Together, these models provide a framework for simulating phase transformations across the entire processing route from casting to homogenisation and ageing treatment. The modelling results are supported and validated by advanced characterisation and mechanical experiments. Zn is shown to play a central role in age-hardening by promoting the formation of fine strengthening precipitates. Ca is beneficial in refining grain structure and modifying texture and tends to form Laves phases during solidification. These coarse particles are thermodynamically stable and dissolve slowly during homogenisation, limiting solute uniformity. Ag additions can promote mechanical performance by accelerating the nucleation of fine precipitates, improving strengthening responses. By linking CALPHAD predictions with observed microstructure and mechanical behaviour, this work establishes a predictive design strategy for magnesium alloys.

Yanheng Xie

Advances in lightweight structural materials have intensified interest in magnesium alloys, particularly those strengthened by Zn, Ca, and Ag additions. This research presents a comprehensive study of the thermodynamic and kinetic behaviour of Mg-Zn-Ca and Mg-Zn-Ca-Ag alloys using an integrated CALPHAD-based modelling and experimental approach. The solidification process is analysed using an extended Scheil model, capturing non-equilibrium phase evolution and solute segregation during casting. A mean-field model is developed to simulate the nucleation, growth, and coarsening of strengthening phases during heat treatment, enabling the prediction of precipitate evolution over time. Together, these models provide a framework for simulating phase transformations across the entire processing route from casting to homogenisation and ageing treatment. The modelling results are supported and validated by advanced characterisation and mechanical experiments. Zn is shown to play a central role in age-hardening by promoting the formation of fine strengthening precipitates. Ca is beneficial in refining grain structure and modifying texture and tends to form Laves phases during solidification. These coarse particles are thermodynamically stable and dissolve slowly during homogenisation, limiting solute uniformity. Ag additions can promote mechanical performance by accelerating the nucleation of fine precipitates, improving strengthening responses. By linking CALPHAD predictions with observed microstructure and mechanical behaviour, this work establishes a predictive design strategy for magnesium alloys. These findings are directly applicable to the development of lightweight structural materials, aligning with Industry 4.0 schemes that include data-driven materials design and digital manufacturing.

Tracie Lee Durbin, Thomas Sanders, Jr.

This dissertation investigates the dissolution behavior in aluminum alloys, specifically focusing on the mechanisms that govern this phenomenon. The primary objective is to develop a comprehensive model that captures the dynamics of dissolution in these materials, thereby enhancing understanding and control over alloy performance. Methodologically, the study employs a combination of computational simulations and theoretical analysis to explore how various factors, such as temperature and alloy composition, influence dissolution rates. Results indicate a strong correlation between the alloying elements and the kinetics of dissolution, revealing critical insights into the microstructural changes that occur during alloy processing. The model developed provides a robust framework for predicting dissolution behavior under varying environmental conditions and can be utilized to optimize alloy formulations in future applications. This work contributes significantly to the field of mechanical engineering by offering valuable data that can inform both academic research and industrial practices in the development of aluminum alloys.

Luis Fernando Romano Acosta, Eric Palmiere

This thesis investigates the microstructure development of complex phase (CP) steels during thermomechanical processing (TMP). The objective is to enhance the understanding of the microstructural evolution in CP steels, which typically comprise a mix of ferrite, bainite, and martensite, under specific TMP conditions. Methodologically, the research incorporates advanced techniques such as Electron Backscatter Diffraction (EBSD) to map and quantify the different phases present in the steel samples subjected to designed TMP routes. The EBSD maps are constructed to elucidate phase segmentation based on crystal structure, and metrics like grain orientation spread and aspect ratio are applied to define grain characteristics. Results indicate that the TMP routes significantly influence the microstructural composition, leading to variations in phase distribution and grain size, which are critical for determining the mechanical properties of CP steels. Furthermore, the findings provide insights into optimizing TMP parameters for desired microstructural outcomes in steel production.

Luis Fernando Romano Acosta, Eric Palmiere

This thesis presents an in-depth investigation into the microstructure development of Complex Phase (CP) steels during thermomechanical processing (TMP). The objective of this research is to gain a better understanding of how different processing parameters affect the resulting microstructure in these advanced materials. Employing advanced characterization techniques such as Electron Backscatter Diffraction (EBSD), the study meticulously analyzes the phases present, including ferrite, bainite, martensite, and occasionally retained austenite within the CP steels. A comprehensive experimental methodology was established, wherein the TMP route was systematically designed, and the EBSD maps were constructed to identify and quantify the microstructural phases in various specimens. The results reveal that the microstructural evolution is significantly influenced by processing conditions, which is crucial for optimizing the mechanical properties of CP steels. The findings contribute valuable insights that may guide future research and development efforts in the steel industry, particularly for applications requiring high strength and ductility.

Department of Mechanical Engineering, SIET Nilokheri

This laboratory manual outlines a structured approach to exploring fundamental concepts in material engineering, particularly focusing on crystal structures and microstructural analysis of various alloy types. The main objective is to familiarize students with practical experiments that enhance their understanding of metallurgical principles. The methodology encompasses a series of experiments including the study of crystal structures using models, operation of a metallurgical microscope, specimen preparation for metallographic examination, and microstructural analysis of different alloys such as carbon steels, cast iron, brass, bronze, and aluminum alloys. The manual delineates standard testing methods for estimating grain size, along with annealing and hardening processes, aiming to analyze the microstructural changes resulting from these treatments. Results from these experiments are expected to provide insights into the hardness variations among treated and untreated steel specimens, thus contributing to a comprehensive understanding of material properties. The manual serves as an essential resource for students in the Mechanical Engineering Department, facilitating hands-on experience in a laboratory setting.

Department of Mechanical Engineering, SIET Nilokheri

This laboratory manual presents a comprehensive guide for conducting experiments in material engineering, focusing on the exploration of various crystal structures and their properties. The objective is to equip students with practical knowledge regarding metallurgical microscopes, specimen preparation, grain size estimation, and microstructural analysis of different steel and alloy specimens. Methodologically, the manual outlines a series of structured experiments, including studies on body-centered cubic (BCC) and face-centered cubic (FCC) crystal structures, as well as microstructural analyses of carbon steels, low alloy steels, and non-ferrous alloys. Through hands-on testing, students learn to perform hardness tests, heat treatments such as annealing and hardening, and effectively analyze microstructures. Results from these experiments provide valuable insights into the relationships between processing conditions and material properties, enhancing students' understanding of material behavior and performance in engineering applications. This manual serves as a critical resource for students in mechanical engineering to gain practical skills essential for their academic and professional careers.

Zhihua ZHU

Application prospects in the automotive industry have led to increasing interests in the studies on Al-Mg-Cu-Si alloys. In this PhD thesis, nine Al-(1-3)Mg-(0-0.4)Cu-0.15Si-0.25Mn (in wt%) alloys with potential applications in both packaging and automotive industries have been investigated. The principal aim of the thesis is to elucidate the relation between processing and the final strength of the alloys. By means of mechanical testing, differential scanning calorimetry (DSC) and transmission electron microscopy (TEM), this study identified several mechanisms that influence the final strength of cold rolled alloys during ageing: solid solution, work hardening, recovery and precipitation. Microstructure analyses using field emission gun scanning electron microscopy (FEG-SEM) and energy dispersive spectroscopy (EDS) revealed the formation of undissolved coarse particles consuming the small Si addition, which influences age hardening behaviour. Furthermore, the thesis explores the development of a yield strength model accounting for ageing behaviour of solution treated samples, ultimately providing insights into enhancing the strength characteristics of these alloys for industrial applications.

Department of Metallurgical and Materials Engineering

This laboratory manual serves as a comprehensive guide for B. Tech students in their second year, specifically during the third semester, detailing essential safety protocols and experimental procedures in physical metallurgy. The objective is to equip students with practical skills in metallographic techniques, enabling them to prepare and examine various metals and alloys under a microscope. The methodology includes hands-on activities such as studying the metallurgical microscope, preparing metallographic samples, and interpreting microstructures of both heat-treated steels and non-ferrous metals. Students are instructed to conduct microscopic examinations and report their findings in a structured format, focusing on significant features and magnifications relevant to the samples analyzed. Results from these activities are expected to deepen students' understanding of metallurgical principles through identification and sketching of microstructures. The emphasis on safety in the lab underscores the importance of following guidelines to maintain a secure working environment. This approach not only enhances students' knowledge but also promotes best practices in laboratory settings.

Dr.KallolMondal, Dr.VivekVerma

This manual provides a comprehensive guide to the Physical Metallurgy Lab, aimed at undergraduate students in Materials Science and Engineering. The objective is to facilitate hands-on experience in various metallurgical techniques and to understand the fundamentals of materials behavior under different conditions. The methodology includes a series of experiments focusing on key topics such as nucleation and growth in eutectoid steel, recovery and recrystallization of materials, carburization of steel, and thermal analysis using Differential Scanning Calorimetry (DSC). In addition, students will undertake projects involving the aging response of Duralumin, microstructural identification using X-ray Diffraction (XRD), and analyses of various thermal treatments like annealing and hardening. The results from these experiments are intended to develop practical skills, enhance theoretical knowledge, and encourage critical thinking regarding material properties and processing. Safety protocols are emphasized throughout the manual to ensure a safe working environment in the lab. Overall, this lab manual serves as an invaluable resource for students to gain practical insights into the study of materials science and engineering.

Stacy Gleixner, Elliot Douglas

This paper presents a set of engineering project laboratory modules designed for an introductory materials course, aimed at enhancing student engagement and understanding of core concepts in materials science. The primary objective is to develop hands-on learning experiences that promote problem-solving skills and practical application of theoretical knowledge among undergraduate engineering students. The methodology involved a series of integrated laboratory modules that incorporate real-world engineering challenges, allowing students to apply material principles in a collaborative setting. Assessments were conducted through student feedback, performance metrics, and qualitative observations during the lab sessions. Results indicate an improvement in students' understanding of materials properties and engineering practices, as well as an increase in their motivation and retention in engineering programs. The modules facilitated a deeper engagement with the content, demonstrating the effectiveness of project-based learning in engineering education. This work underscores the importance of innovative teaching strategies that align with contemporary educational goals in the field of materials science. The findings contribute to the ongoing discourse on pedagogical practices in engineering education, providing a framework for future curriculum development. Contribution to greater understanding of materials education is significant as it paves the way for further research and implementation of similar educational initiatives.

Stacy Gleixner, Elliot Douglas

This paper discusses the development and implementation of engineering project laboratory modules aimed at enhancing the learning experience in an introductory materials course. The primary objective was to create engaging, hands-on projects that facilitate the understanding of fundamental materials science concepts. The methodology involved designing various lab modules that encourage problem-solving, teamwork, and practical application of materials theory. Results from student feedback and performance indicated a significant increase in student engagement and understanding of the material. Furthermore, these modules fostered a collaborative learning environment, allowing students to connect theoretical concepts with real-world applications in materials engineering. The findings suggest that incorporating project-based learning approaches in materials courses can effectively enhance student learning outcomes and foster a deeper appreciation for the subject matter.

Department of Industrial and Production Engineering

The Metallography and Material Testing Lab Manual serves as an essential guide for students in the Department of Industrial and Production Engineering at Sri Jayachamarajendra College of Engineering. The manual aims to provide an understanding of material behavior under various external loads, including tension, torsion, and bending, while reinforcing theoretical concepts learned in the classroom. Methodologically, students perform a series of experiments that assess mechanical properties such as hardness, wear, creep, and fracture modes, as well as conducting heat treatments and metallographic examinations to investigate microstructures. Results indicate that hands-on experimentation enhances students' comprehension of materials engineering, allowing them to identify material characteristics and conduct heat treatments effectively. The culmination of these activities is the preparation of professionally documented reports summarizing findings, thereby equipping students with practical knowledge and technical skills pertinent to their future careers in engineering.

C.A. Handwerker, R.J. Schaefer

The research presents a prediction model for the variation in hardness across the surface of a standard reference material (SRM) 2812, specifically a Rockwell C scale test block. This model facilitates the calculation of certified hardness values at locations on the test surface that have not been previously measured, thereby reducing measurement uncertainty associated with block nonuniformity. The developed methodology is applicable for quality control and assurance in metallurgical applications, enabling more reliable and accurate hardness testing. By employing calibrations at a limited number of points, the prediction model allows for a broader assessment of material hardness across various regions of the test block, enhancing the understanding of material properties in engineering and manufacturing contexts. Results indicate that the implementation of this model effectively mitigates the inherent variability in hardness measurements, leading to improved standardization processes and better material performance evaluations across industries.

Department of Industrial and Production Engineering

This lab manual is designed for students in the Department of Industrial and Production Engineering at Sri Jayachamarajendra College of Engineering, Mysuru, focusing on metallography and material testing. The objective of the lab is to provide students with hands-on experience in analyzing the mechanical properties of materials under various types of external loads, including tension, torsion, and bending. Methodologically, students will perform a series of experiments designed to reinforce classroom theory, such as testing material behavior, studying mechanical characteristics like hardness and creep, and examining fracture modes under different conditions. Results from these experiments will enable students to determine material properties and characteristics, understand the effects of heat treatment processes, and identify microstructures through metallographic examination. This practical experience aims to equip students with the skills necessary for professional practice, culminating in a comprehensively prepared report reflecting their findings and analyses.

LSU

Proper preparation of metallographic specimens is essential for accurately determining their microstructure and composition. This experiment aims to familiarize students with the step-by-step process involved in preparing metallographic specimens, which includes sectioning, mounting, grinding, polishing, etching, and microscopic examination. Each student is tasked with preparing and analyzing samples of brass, steel, and aluminum, as well as eutectoid steel and eutectoid Pb-Sn samples. By following meticulous preparation protocols, the integrity of the microstructures is preserved, allowing for accurate observations and conclusions. The study also emphasizes the importance of maintaining cleanliness and precision throughout the preparation process to avoid alterations in microstructure that might lead to erroneous results. Various techniques such as optical microscopy and advanced methods, which may include electron microscopy and x-ray diffractometry, are highlighted for specimen examination. Results from the examination will contribute to the understanding of how different alloy compositions influence microstructure and properties, culminating in examinations of ASTM grain size numbers for the specimens. This hands-on experience is fundamental in imparting practical skills in metallography to engineering students.

Donald C. Zipperian, Ph.D.

Metallography is a critical field that focuses on the study of materials' microstructures, serving as a key tool for both ensuring product reliability and analyzing material failures. This paper outlines the essential steps for proper metallographic specimen preparation, including documentation, sectioning and cutting, mounting, grinding, polishing, etching, microscopic analysis, and hardness testing. The methodology encompasses various cutting techniques tailored to the material type, emphasizing the importance of minimizing damage during the sectioning process to preserve accurate microstructural characterization. Specific guidelines for blade selection based on material characteristics and cutting parameters are presented in tables. By establishing appropriate specimen preparation procedures grounded in physical property knowledge and careful selection of abrasives and equipment parameters, the study aims to enhance the representation of the materials' microstructures. This systematic approach serves to reinforce metallography as a powerful quality control measure and an investigative tool in materials science. The insights provided in this paper are intended to assist practitioners and researchers in the field of metallography in achieving optimal results during specimen preparation.

MSE Faculty

The document provides a comprehensive overview of the current laboratories included in the digitized portion of the Materials Science course curriculum. The objective is to present a structured and detailed outline of various laboratory activities that enhance the learning experience in the field of materials science. Methodologically, the content is organized into sections that cover different laboratories, each focusing on specific scientific principles such as crystal structure, electrical conductivity, mechanical properties, phase diagrams, and the behavior of various materials. Each section includes detailed activities, safety guidelines, worksheet tasks, and simulations that support optimal learning outcomes for students. The results illustrate a versatile and impactful curriculum that is designed to integrate practical laboratory experience with theoretical knowledge, preparing students for advanced studies and research in materials science. This document serves as a vital resource for both educators and students, ensuring a comprehensive understanding of materials science through hands-on experimentation and theoretical exploration.

E.N. Pugh, J.H. Smith

This report summarizes the FY1988 activities of the Metallurgy Division of the National Institute of Standards and Technology (NIST). The research centers upon the structure-processing-properties relations of metals and alloys and on the methods of their measurement. The activities also include the generation and evaluation of critical materials data. Efforts comprise studies of metallurgical processing, corrosion, mechanical properties, electrodeposition, process sensors, high temperature reactions and magnetic materials. The work described also includes four cooperative programs with American professional societies and industry: the National Association of Corrosion Engineers (NACE)-NIST Corrosion Data Program, the Aluminum Association-NIST Temperature Sensor Program, the American Iron and Steel Institute (AISI)-NIST Steel Sensor Program, and the ASM INTERNATIONAL (ASM)-NIST Alloy Phase Diagram Program. The scientific publications, committee participation, and other professional interactions of the 79 full-time and part-time permanent members of the Metallurgy Division and its 48 guest researchers are identified.

E.N. Pugh, J.H. Smith

This report summarizes the FY1988 activities of the Metallurgy Division of the National Institute of Standards and Technology (NIST). The research centers upon the structure-processing-properties relations of metals and alloys and on the methods of their measurement. The activities also include the generation and evaluation of critical materials data. Efforts comprise studies of metallurgical processing, corrosion, mechanical properties, electrodeposition, process sensors, high temperature reactions, and magnetic materials. The work described also includes four cooperative programs with American professional societies and industry: the National Association of Corrosion Engineers (NACE)-NIST Corrosion Data Program, the Aluminum Association-NIST Temperature Sensor Program, the American Iron and Steel Institute (AISI)-NIST Steel Sensor Program, and the ASM INTERNATIONAL (ASM)-NIST Alloy Phase Diagram Program. The scientific publications, committee participation, and other professional interactions of the 79 full-time and part-time permanent members of the Metallurgy Division and its 48 guest researchers are identified.

MIT

This laboratory manual focuses on the metallographic examination of archaeological artifacts, providing a comprehensive guide for understanding metal structures through microscopic analysis. The objective is to educate students and professionals in the field of materials science and archaeology on the practical aspects of metallography and its applications in revealing the manufacturing processes, composition, and condition of metal artifacts. The methodology includes sampling techniques, preparation of metallographic specimens, and use of etching agents for revealing microstructures. Detailed protocols for sample selection and analysis are outlined, ensuring maximum information is obtained from minimal samples. The results illustrate the diverse information that metallography can extract, including manufacturing techniques, temperature exposure during production, corrosion analysis, and alloy composition. This manual serves as an essential resource for students and researchers involved in the study of historical artifacts, offering practical guidance for metallographic practices and fostering a deeper understanding of ancient metalworking techniques.

Alexander Kauffmann

The Metallography Lab Course at the Karlsruhe Institute of Technology aims to provide students with a comprehensive understanding of metallographic analyses essential for materials science and engineering. The objective of the course is to familiarize participants with various methods of analyzing the structure and microstructure of materials. A structured methodology is employed, which includes sample extraction, mounting, grinding, polishing, contrasting, imaging, and both qualitative and quantitative analyses. This hands-on approach allows students to engage with actual processes and interpretations of metallographic samples. Key results indicate that students gain practical experience and theoretical knowledge necessary for their future careers in materials science and engineering. The incorporation of relevant literature further enriches the learning experience. Overall, this lab course serves as a vital foundation for students to apply metallographic techniques in their future academic and professional pursuits.

Eyyüp Murat Karakurt, Dr Yan Huang

This thesis presents a study on microstructural, biomechanical, and in vitro studies of Ti-Nb-Zr alloys fabricated by powder metallurgy with the space holder technique. This work aims to fabricate Ti-xNb (x:10, 20, and 30; at.%), Ti-20Zr (at.%) and Ti-xNb-10Zr (x: 10, and 20; at.%) alloys with different porosities used as a load-bearing implant that can mimic bone structure. Microstructural analysis was performed by using various methods including scanning electron microscopy, energy dispersive spectroscopy, electron backscatter diffraction and X-ray diffraction. Corrosion performance was assessed via electrochemical polarisation tests, while mechanical behaviour was determined by uniaxial compressive tests. In vitro studies such as cell viability and proliferation, adhesion potential, and genotoxicity were examined by performing MTT assay, scanning electron microscopy, fibronectin adsorption, and plasmid-DNA interaction assay. Results revealed that the alloys could be divided into low and highly porous categories, with porosities ranging from 21% to 29% and 43% to 58%, respectively. The alloys exhibited irregularly shaped open pores with a uniform pore size distribution, allowing for cell ingrowth. Adding a space holder effectively adjusted the porosity characteristics of the alloys achieved. As foreseen, porosities dramatically diminished the mechanical performance of the alloys. The ultimate compressive strengths ranged from 618 MPa to 1376 MPa for low porous alloys and from 48 MPa to 356 MPa for highly porous alloys. Moreover, potentiodynamic polarisation revealed that the alloys had passivation behaviour, protecting against corrosion attacks in Hank’s Balanced Salt Solution. Ti-xNb and Ti-xNb-10Zr alloys contained hcp α-Ti and bcc β-Ti phases with primary niobium phase, while Ti-20Zr alloys exhibited hcp α-Ti and distorted hcp αʹ-Ti phase structures. Biological evaluations of the alloys studied met the biocompatibility criteria required for orthopaedic biomaterial use.

Eyyüp Murat Karakurt, Yan Huang

This thesis presents a study on microstructural, biomechanical, and in vitro studies of Ti-Nb-Zr alloys fabricated by powder metallurgy with the space holder technique. This work aims to fabricate Ti-xNb (x:10, 20, and 30; at.%), Ti-20Zr (at.%) and Ti-xNb-10Zr (x: 10, and 20; at.%) alloys with different porosities used as a load-bearing implant that can mimic bone structure. Microstructural analysis was performed by using various methods including scanning electron microscopy, energy dispersive spectroscopy, electron backscatter diffraction and X-ray diffraction. Corrosion performance was assessed via electrochemical polarisation tests, while mechanical behaviour was determined by uniaxial compressive tests. In vitro studies such as cell viability and proliferation, adhesion potential, and genotoxicity were examined by performing MTT assay, scanning electron microscopy, fibronectin adsorption, and plasmid-DNA interaction assay. Results revealed that the alloys could be divided into low and highly porous categories, with porosities ranging from 21% to 29% and 43% to 58%, respectively. The alloys exhibited irregularly shaped open pores with a uniform pore size distribution, allowing for cell ingrowth. Adding a space holder effectively adjusted the porosity characteristics of the alloys achieved. As foreseen, porosities dramatically diminished the mechanical performance of the alloys. The ultimate compressive strengths ranged from 618 MPa to 1376 MPa for low porous alloys and from 48 MPa to 356 MPa for highly porous alloys. Moreover, potentiodynamic polarisation revealed that the alloys had passivation behaviour, protecting against corrosion attacks in Hank's Balanced Salt Solution.

Christos V. Chorinos, Helen Kamoutsi

This diploma thesis investigates the microscopic characteristics of H13 tool steel produced through selective laser melting (SLM), focusing on the impact of various processing parameters. The objective of the study is to determine how different SLM conditions, such as laser power, scanning speed, and layer thickness, affect the microstructure and mechanical properties of the material. The research methodology encompasses a series of experimental tests, including metallographic sample preparation, microscopy analyses, and mechanical property assessments, to analyze the resulting microstructures. The results demonstrate significant correlations between process parameters and the evolution of the microstructure, highlighting that optimized SLM conditions can lead to enhanced mechanical properties in H13 tool steel. Additionally, the findings suggest potential pathways for improving tool steel processing methodologies within the field of mechanical engineering. Overall, this study contributes valuable insights to the understanding of SLM technology and its application to high-performance materials like tool steels.

G.E.Hicho, W.J.Boettinger

We have examined the failed or "mishap" section, and other selected sections made from 17-7 precipitation hardening stainless steel, and have concluded that the unusually large amount of retained austenite, greater than 7%, measured on the surface appears to have been produced during both the solution annealing and austenite conditioning steps of the heat treating process, but was revealed only after the austenite conditioning step. We suspect that during the heat treating process these sections may have been exposed to a furnace atmosphere that contained too much carbon or nitrogen. This exposure could have led to an increase in the amount of retained austenite both on the surface and internally.

G.E. Hicho, W.J. Boettinger

This study examines a mishap section and other selected sections made from 17-7 precipitation hardening stainless steel, revealing an unusually large amount of retained austenite greater than 7%. The excessive retained austenite on the surface appears to have been produced during both the solution annealing and austenite conditioning steps of the heat treating process, although it was only revealed after the austenite conditioning step. It is suspected that these sections may have been exposed to a furnace atmosphere containing too much carbon or nitrogen during the heat treating process, which could have led to an increase in the amount of retained austenite both on the surface and internally. The metallurgical examination provides insight into the factors contributing to this microstructural condition, emphasizing the importance of controlling furnace atmospheres to avoid potentially detrimental effects on material properties.

S. W. Stratton

In modern metals testing, understanding the underlying conditions that determine the properties of metals and alloys is essential. This document presents an overview of metallography, which involves examining the structure, constitution, and treatment of metals and alloys. The principal conditions influencing mechanical properties include melting and casting processes, mechanical working, thermal treatment, and structural features. The Bureau of Standards' circular outlines various metallographic testing approaches, including microscopy and structure analysis, thermal analysis, heat treatment, and chemical metallurgy. It emphasizes the necessity of metallographic methods alongside traditional mechanical and chemical analyses to achieve a comprehensive understanding of material properties. The text also provides guidelines on types of examinations, fees for specific tests, and discounts available for educational and scientific institutions. Through these methods, it is hoped that numerous unexplained difficulties in metallurgy can be addressed more effectively. A detailed table of contents is included to systematically guide readers through the various topics discussed in the circular.

S. W. Stratton

In the modern testing of metals, determining their properties is insufficient without understanding the underlying conditions that influence these properties. This circular outlines the significance of metallography, which encompasses the study of the structure, constitution, and treatment of metals and alloys. It identifies critical factors affecting the mechanical and other common properties of metals, including melting and casting conditions, mechanical working, thermal treatment, and structural features. The document discusses various metallographic testing methods employed by the Bureau of Standards, categorized into microscopy and structure of metals, thermal analysis and heat treatment, mechanical working, chemical metallurgy, and the melting of metals. These categories align with the subdivisions within the field of metallurgy and serve to facilitate the physical metallurgical research and investigations. Ultimately, the circular emphasizes the necessity of incorporating metallographic examination methods alongside traditional mechanical tests and chemical analyses to achieve a comprehensive understanding of metals and alloys, thereby addressing complex issues that were previously intractable with older testing methodologies.

David A. Scott

This work discusses the intricacies of metallography and the microstructure present in ancient and historic metals, aiming to elucidate the methods and findings associated with the study of such materials. The objective is to enhance the understanding and conservation of metallic artifacts of historical significance. Employing a range of metallographic techniques, the research analyzes various ancient metal samples, including Wootz steel, to reveal their microstructural features and the implications of their compositions. Results indicate significant variances in the microstructures of different metals, which are critical for determining their processing methods and subsequent conservation strategies. This foundational study serves to inform future conservation efforts and metallurgical research by highlighting the importance of accurate metallographic analysis. In conclusion, the findings underscore the value of such analyses in preserving heritage metals and a deeper understanding of their historical contexts.

Bandaru Dyva Isac Premkumar

This document provides an introduction to the Metallurgy and Material Science Lab, aiming to expose students to fundamental techniques employed in metallurgical practices. The primary objective is to help students determine the mechanical properties of materials under varying loading conditions and explore the microstructural attributes of alloys. A hands-on methodology is implemented, where students engage in procedures such as sectioning, grinding, polishing, etching, and photomicrography using optical microscopes equipped with digital cameras. Additionally, the lab emphasizes tensile and impact testing on standardized samples to illustrate the strengths and limitations of different materials. By integrating practical laboratory work with theoretical lectures, students gain a comprehensive overview of metallographic evaluations used across diverse industries, including aerospace, automotive, and construction. The course outcomes include the ability to prepare test specimens per standards, observe and analyze microstructures, perform hardness testing, and execute heat treatment of steels, ensuring a well-rounded educational experience for participants.

Muffakham Jah College of Engineering and Technology

This document outlines the experiments conducted in the Metallography course for the academic year 2021-2022 at Muffakham Jah College of Engineering and Technology, specifically within the Mechanical Engineering Department. The objective is to provide mechanical engineering students with hands-on experience in metallographic studies of various materials, including low and medium carbon steel, grey cast iron, malleable cast iron, brass, and aluminum-silicon alloy. A series of carefully structured experiments are detailed, including the preparation and etching solutions required for effective microstructural analysis that adheres to ASTM and BS standards. Results from these experiments demonstrate the microstructures of different alloys, such as the appearance of eutectic mixtures in aluminum-silicon alloys and the properties associated with carbon content in cast iron. Through these practical exercises, students gain valuable insights into the relationships between material properties and processing techniques, reinforcing their understanding of metallurgical principles. Additionally, precautions and procedural instructions are highlighted to ensure safety and accuracy during experimentation. The document serves as a comprehensive guide for both instructors and students engaged in metallographic analysis.

Ubaid-ur-Rehman Ghori

This research explores the temperature-dependent plastic deformation of magnesium through micro-pillar compression techniques, aiming to enhance the understanding of its mechanical behavior under varying thermal conditions. Given magnesium's growing importance in various engineering applications due to its lightweight and high strength-to-weight ratio, the study's objective is to investigate how temperature influences the deformation mechanisms at the micro-scale. The methodology involved fabricating micro-pillars of magnesium and conducting compression tests at different temperatures to observe changes in yield strength and ductility. Statistical analysis of the results indicated a marked decrease in yield strength with increasing temperature, highlighting the role of thermal activation in plastic deformation. The findings reveal that temperature plays a crucial role in modifying the deformation characteristics of magnesium, with implications for its performance in real-world applications. This work contributes to the existing body of knowledge regarding magnesium's mechanical properties and sets the groundwork for future studies focused on optimizing its use in structural applications.

Ubaid-ur-Rehman Ghori

This thesis investigates the temperature-dependent plastic deformation of magnesium through micro-pillar compression, addressing critical challenges in the mechanical behavior of this metal at varying temperatures. The objective of the study is to analyze how temperature influences the deformation mechanisms and yield strength of magnesium. To achieve this, a series of micro-pillar compression tests were performed across a range of temperatures, allowing for detailed observations of the material's response to stress. The methodology involved the fabrication of micro-pillars using micro-machining techniques, followed by in-situ compression tests under controlled temperature conditions. The results obtained demonstrate a significant correlation between temperature and the flow stress of magnesium, indicating that increased temperatures lead to enhanced ductility and reduced strength. The findings suggest that the activation of specific deformation mechanisms, such as twinning and dislocation movement, plays a crucial role in this behavior. Overall, this research contributes to a deeper understanding of the mechanical properties of magnesium and highlights the importance of temperature in materials science, with implications for its applications in various engineering fields.

Mairym Vázquez

This dissertation investigates the microstructure and mechanical behavior of novel powder-extruded Al-Ce-Mg alloys, aiming to enhance understanding of these materials for structural applications. The objective is to characterize the microstructural features and performance metrics of the alloys under varying processing conditions. Employing a combination of experimental techniques, including scanning electron microscopy (SEM) and tensile testing, the study systematically analyzes the impacts of processing parameters on the microstructural evolution and mechanical properties. Key findings reveal significant correlations between processing conditions and the resulting microstructure, which in turn influences the mechanical behavior, including yield strength and ductility. The optimized conditions for achieving superior mechanical performance are identified and discussed, contributing valuable insights into the design of lightweight alloys with enhanced properties. This work not only enriches the body of knowledge in materials science but also proposes pathways for the development of advanced aluminum-based alloys for various engineering applications.

Dongqing Yan, Somayeh Pasebani

This study investigates the effect of Laser Powder Bed Fusion (LPBF) parameters and Hot Isostatic Pressing (HIP) on the microstructure and mechanical properties of Hastelloy C22 alloy. The primary objective was to optimize laser power and scanning speed to achieve the highest density in the manufactured specimens, with optimal conditions identified at 150 W and 200 mm/s, yielding a relative density of 99.6%. A total of eight post-processing conditions including heat treatment and HIP were evaluated to analyze phase composition and microstructural characteristics using various microscopy techniques. The results revealed that typical cellular and columnar dendritic structures were present in as-printed samples, with Mo-rich nanoparticles enhancing strength. While HIP was effective in reducing defects, fine precipitates were observed in the HIPped samples. Solution heat treatment resulted in complete recrystallization but demonstrated limited impact on mechanical enhancement compared to HIP. Consequently, the findings suggest that LPBF followed by HIP is essential for producing fully dense parts with optimal mechanical properties, while the role of solution treatment is comparatively less significant.

Madie Allen, James Campbell

Additive manufacturing (AM) is becoming an increasingly popular manufacturing process due to its design freedoms and material efficiency. However, the use of AM in industry is limited by the reliability of the deposited parts. Process-microstructure-property relationships are of paramount importance to increasing understanding and consistency within additive processes. Within this work, thermal and microstructure modelling methods are investigated to develop an efficient approach to the simulation of solidification microstructure. Finite element thermal models are considered alongside the implementation of analytical solutions. Cellular automata methods are utilized to simulate grain growth, while 2D models are implemented for computational efficiency. The established approach is applied to three case studies: the application to laser scans on a bare nickel superalloy substrate, followed by direct energy deposition techniques. The second study investigates the modelling approach's capability to capture changes in microstructure as a result of varying process parameters. Finally, the modelling approach is applied to functionally graded materials through in situ changes in process parameters.

Xingjian Zhao

Magnesium (Mg) and its alloys represent the lightest structural metallic materials available, with a density approximately two-thirds that of aluminum (Al) alloys and four to five times lighter than steel. This characteristic, combined with a high strength-to-weight ratio, enables their use in sectors where mass reduction is pivotal, such as in transportation industries including automobiles and aeronautics, ultimately improving fuel efficiency and reducing emissions. However, the production of Mg remains energy-intensive, counteracting some environmental benefits. Furthermore, the hexagonal close packed (HCP) crystal structure of Mg alloys complicates the balance between strength and ductility, posing significant challenges in their application. This research aims to develop Mg alloys that successfully integrate strength and ductility through innovative friction stir-based technologies. The methodology involves the careful selection of alloy compositions and processing parameters, followed by extensive mechanical testing to evaluate the resultant material properties. Preliminary findings indicate that the proposed approach can lead to significant improvements in both mechanical performance and sustainability in Mg alloy applications. This work holds promise for advancing the use of lightweight materials in modern engineering and transportation applications, contributing to ongoing efforts to enhance energy efficiency.

Emily Margaret McCabe

This graduate thesis evaluates the effects of rotational speed on the microstructural and mechanical properties of additive friction stir deposited aluminum 6061. The study aims to understand how varying rotational speeds during the friction stir process influences the final properties of the aluminum alloy. A detailed methodology was employed, involving the preparation and analysis of samples subjected to different rotational speeds, followed by microstructural examinations and mechanical testing. Results indicate significant variations in grain structure, hardness, and tensile strength correlating with the specified rotational speeds. Specific findings show that higher rotational speeds tend to refine the microstructure, leading to improved mechanical properties, particularly tensile strength. These insights provide a deeper understanding of the relationship between process parameters and material performance, allowing for optimization in additive manufacturing processes. It also highlights the potential for enhancing the mechanical integrity of aluminum components produced through friction stir deposition techniques. This research contributes valuable data and practical guidelines that could influence future practices in the field of additive manufacturing within the engineering sector.

Feng Yan, Shouxun Ji

Aluminium alloys are the most promising lightweight materials used in the automotive industry to achieve weight reduction for improving fuel efficiency and reducing CO2 emissions. High pressure diecasting (HPDC) is a fast and economical near-net shape manufacturing method to produce engineering components. About 80 % of cast aluminium alloys are currently manufactured by HPDC. The increased demands of manufacturing structural components by the HPDC process require high strength Al-alloys for the automotive industry. However, the currently available die cast Al-alloys are unable to fulfill this requirement. Al-Mg2Si alloy is known as an alloy capable of providing superior high strength by Mg2Si particles. However, Al-Mg2Si alloy is not applicable in the HPDC process because of the severe die soldering problem. This has limited its applications throughout industries. Moreover, the existing studies on the Al-Mg2Si alloy are mainly focused on the hyper-eutectic alloys and limited information is available for hypo-eutectic alloys. Therefore, the development of high strength Al-Mg2Si based alloys for the HPDC process is significant for manufacturing quality automotive components. The present study mainly focuses on the alloy development for the HPDC process, investigating the effect of excess Mg on the solidification, microstructural evolution, and mechanical properties of Al-Mg2Si alloys.

Feng Yan, Dr. Shouxun Ji, Prof. Zhongyun Fan

Aluminium alloys are the most promising lightweight materials used in the automotive industry to achieve weight reduction for improving fuel efficiency and reducing CO2 emissions. High pressure diecasting (HPDC) is a fast and economical near-net shape manufacturing method to produce engineering components. About 80% of cast aluminium alloys are currently manufactured by HPDC. The increased demands of manufacturing structural components by HPDC require high strength Al-alloys for the automotive industry; however, the currently available die cast Al-alloys are unable to fulfill this requirement. Al-Mg2Si alloy is known for providing superior high strength through Mg2Si particles but is not applicable in the HPDC process due to severe die soldering issues, limiting its industrial applications. This study focuses on the alloy development for the HPDC process, investigating the effect of excess Mg to modify the hypo-eutectic Al-Mg2Si system and improve mechanical properties. The research combines thermodynamic calculations with experimental methods to analyze the solidification, microstructural evolution, and mechanical characteristics of Al-Mg2Si alloys. Consequently, developing high strength Al-Mg2Si based alloys for the HPDC process is significant for manufacturing quality automotive components.

Stephen Essex

This thesis investigates the ultrasonic characterization of rolled aluminium and steel sheets, correlating findings with measurements obtained from Electron Backscatter Diffraction (EBSD). The objective is to enhance the reliability of non-destructive testing techniques by establishing a link between ultrasonic characteristics and microstructural properties identified through EBSD. A combination of theoretical analysis and experimental measurements was employed, utilizing advanced Electromagnetic Acoustic Transducers (EMATs) to efficiently conduct ultrasonic testing on both materials. The resulting data demonstrated that multiple EBSD scans are essential to accurately represent the texture and microstructure of the sheets, as reliance on single scans proved unreliable. Specifically, it was determined that a minimum sample of approximately 1400 grains is required to yield a statistically significant average texture reading. The research findings advocate for comprehensive analysis by employing in-plane EBSD data to confirm homogeneity within the microstructure of the material under study. This work contributes valuable insights into non-destructive testing methodologies and the mechanical characterization of metals, ultimately fostering improved material utilization in industrial applications.

Nijenthan Rajendran

This dissertation investigates the metal flow optimization within the deformation zone during the continuous rotary extrusion (CRE) of AZ91 magnesium alloy. The objective of this research is to enhance the material flow characteristics and improve the overall efficiency of the extrusion process. A comprehensive methodology was employed, utilizing both experimental techniques and numerical modeling. The study involved developing a robust numerical model using DEFORM® 3D software to simulate the extrusion process and understand the influence of various process parameters on metal flow. Through a series of experiments, hot extrusion exit speeds were analyzed, focusing on optimizing temperature and strain rate conditions. Results indicate significant improvements in metal flow uniformity and extrusion efficiency, leading to a more productive process with reduced material wastage. This work contributes valuable insights into the CRE of magnesium alloys and serves as a foundation for future studies aiming to optimize similar metal forming processes.

ヴィオラ, ポール

An improved combination of strength and ductility is generally a trade-off relationship, and it remains a major research topic in the field of structural materials. A bimodal grained microstructure, consisting of a coarse-grained “core” region and a surrounding fine-grained “shell” region, exhibits a good balance between strength and ductility. Therefore, the strengthening mechanism that contributed to the excellent mechanical properties of the harmonic structure was investigated. Furthermore, the deformation and fracture behavior were also studied. The individual strengthening factor in the Hall–Petch model was investigated using nanoindentation technique to understand the strengthening mechanisms in the SUS304L stainless steel harmonic structure. This is because of the limitation of the conventional evaluation methods for mechanical properties, such as macroscopic tensile or compression tests, which cannot measure each factor separately. Therefore, nanoindentation technique was applied locally, such as in the “grain interior” to evaluate the matrix strength (𝜎!) and “on grain boundary” and “near grain boundary” to assess the grain boundary effect (𝑘) for each region of the shell and core. Important parameters such as the pop-in behavior on the initial loading curve and nanohardness were analyzed.

John F. Ambielli

This thesis presents a comprehensive exploration of industrial process design specifically targeted at the manufacturing of Inconel 718 extremely large forged rings. The objective is to develop methodologies that enhance the efficiency and effectiveness of the manufacturing process of these complex components, which are critical in various high-temperature applications. A combination of experimental studies and theoretical analyses were employed to evaluate the properties and behavior of Inconel 718 during the forging process, with a focus on optimizing parameters such as temperature, pressure, and tooling design. Results demonstrate significant improvements in material characteristics and manufacturing outcomes, highlighting the importance of careful process design in achieving desired mechanical properties and performance metrics. Furthermore, the findings contribute to the broader understanding of Inconel 718 use in industrial applications, offering new insights into its manufacturability and potential innovations in forging techniques. The work concludes by discussing implications for future research and practical applications in the field of materials science and engineering.

ÜLKE ¸ S˙IM¸ SEK

Advancements in technology for the creation, characterization, modeling, design, and application of nanostructured materials are essential for maintaining competitiveness in the global industrial design and manufacturing market. Recently, processing extremely fine-grained metals through severe plastic deformation (SPD) techniques has reached a critical phase in development. Sufficient laboratory findings are available to demonstrate the overall viability of this approach, and it is widely acknowledged that these materials hold significant innovation potential. The present work aims to conduct numerical investigations into the severe plastic deformation behaviors of metallic materials using both classical continuum and microscale approaches based on finite element analysis. The study provides detailed insights into the mechanical properties and deformation mechanisms of various metals subjected to SPD, highlighting the role of microstructural evolution during processing. Experimental validation of the models is presented, along with a comparison of the different simulation techniques employed. The findings contribute to the understanding of how advanced materials can be effectively processed and utilized in aerospace applications.

Dr. K. Viswanath Allamraju, Mr. A Somaiah

This lab manual provides a comprehensive guide for the Materials and Mechanics of Solids course, aimed at B. Tech. students in Mechanical Engineering. The objective is to equip students with essential skills and knowledge required in the analysis and design of mechanical systems. The manual details various experiments, including procedure, observation, and result sections, focusing on shear strength measurements of materials. Methodologically, students are instructed to perform hands-on experiments using a universal testing machine, determining the shear strength through systematic testing and data analysis. Results from these experiments help students understand the behavior of materials under shear stress, fostering their engineering knowledge and problem-solving abilities. The manual supports the academic mission by ensuring quality education and preparing responsible engineers to meet global challenges. It emphasizes the integration of basic and applied research to create competencies necessary for the mechanical engineering domain. Period.

JSS Science & Technology University

This manual serves as a foundational document for the Basic Material Testing Laboratory course, aimed at equipping IV Semester B.E. Mechanical Engineering students with essential skills in material testing. The objective of this manual is to provide a structured approach to laboratory practices, ensuring that students gain practical experience that complements their theoretical knowledge. The methodology includes various testing procedures designed to analyze mechanical properties of materials, such as tensile strength, fatigue resistance, and creep behavior. Through a series of hands-on experiments, students will engage in tasks that require them to apply fundamental principles of mechanical engineering and utilize modern testing equipment. Results derived from these experiments will not only enhance the students' understanding of material behavior under different loading conditions but will also refine their problem-solving skills in real-world contexts. This manual ultimately aims to bridge the gap between academic theory and practical application, preparing students for future challenges in the field of mechanical engineering.

Abinash Pujari

This document presents a comprehensive lecture plan and notes for the Theory of Metal Forming course, which is part of the curriculum for the 6th semester of B.Tech in Production Engineering at Veer Surendra Sai University of Technology, Burla, Odisha, India. The primary objective is to provide students with a detailed understanding of metal forming processes and related stress analysis. The methodology includes a structured outline of lectures covering fundamental concepts such as stress, strain, and the behavior of materials under various forming conditions. Each lecture addresses specific topics, including the state of stress in three dimensions, Mohr's circle, yield criteria, and analysis techniques like upper and lower bound theory. Key findings emphasize the importance of understanding flow curves, friction, lubrication, and the mechanics behind deformation processes. The notes also encompass practical applications of theory to real-world scenarios in metal processing and highlight typical drawing processes utilized in manufacturing. This structured curriculum is aimed at equipping students with the necessary theoretical background and practical insights essential for a career in production engineering.

Siddharth Sankar Jena

This document serves as a lecture note on the deformation behavior of materials, compiled for the 5th semester students of Metallurgical and Materials Engineering. The objective is to present a comprehensive overview of elastic, plastic, and visco-elastic deformation processes within the framework of continuum mechanics. The methodology encompasses fundamental concepts including stress and strain tensors, principal stresses, and the plastic response of materials, focusing on single crystal deformation through various mechanisms such as dislocation movement and twinning. Results emphasize the classification of stress-strain curves and the influential factors that govern material behaviors under loading conditions. Additionally, the document outlines the significance of structural properties in relation to crystal defects and their effects on mechanical characteristics. Overall, this compilation facilitates a better understanding of how metals respond to applied forces, thus aiding in the design of improved material applications.

MOHD ASYRAF BIN CHE AZMI

This study investigates the effect of heat treatment on the corrosion behavior of SS316 stainless steel in a simulated body environment. The objective is to evaluate how different heat treatment processes can influence the resistance of SS316 to corrosion when subjected to conditions that mimic those found in biological systems. A systematic methodology was followed, involving the preparation of stainless steel samples, application of various heat treatments, and subsequent exposure to corrosive environments to assess corrosion rates and mechanisms. The results indicated that heat treatment significantly affects the microstructure of SS316 stainless steel, leading to alterations in its corrosion resistance. Specifically, certain heat treatment procedures enhanced the material's ability to withstand corrosive attacks, while others did not yield favorable outcomes. The findings contribute valuable insights into material selection and treatment processes for applications involving stainless steels in biomedical contexts, highlighting the importance of tailored heat treatment for optimizing performance in corrosive environments.

Alan C Demmons

At temperatures above 0.5 Tm and in aggressive atmospheres predicting alloy performance is particularly challenging. Nickel alloys used in regimes where microstructure and properties are altered dynamically present unique requirements. Exposure may alter properties with unexpected early failure. The Gleeble is a valuable tool for investigation and simulation of thermo-mechanical properties of an alloy in various regimes up to the threshold of melting. In this study, four regimes of temperature and strain rate were simulated in an argon atmosphere to both investigate and document normal and abnormal failure modes. Commercial Inconel 601 was tested in selected regimes and in two treatments (as received and strain aged). Next, two exposed conditions (TEOS and Hydride) were tested. Slow strain-rate and high temperature produced brittle intergranular fracture. Exposure at elevated temperature to process gases reduced both strength and ductility in both TEOS and Hydride. TEOS exposure reduced reduction in area in the alloy significantly more than the Hydride exposure.

Subrata Deb Nath

This doctoral dissertation investigates the process-property-microstructure relationships in laser-powder bed fusion (LPBF) of 420 stainless steel, addressing the growing interest in additive manufacturing technologies for engineering applications. The objective of this research is to delineate how variations in processing parameters affect the resultant material properties and microstructural characteristics of the final product. A combination of experimental and analytical methodologies was employed, which included controlled LPBF experiments and extensive characterization techniques such as scanning electron microscopy (SEM), X-ray diffraction (XRD), and mechanical testing. Results demonstrate a significant correlation between the processing parameters and the resulting microstructure, revealing the importance of factors such as layer thickness, feedstock characteristics, and thermal management during the LPBF process. Additionally, the study identifies optimal processing conditions conducive to enhancing mechanical performance, highlighting the potential of LPBF technology for producing high-performance steel components. The findings contribute valuable insights to the field of mechanical engineering and materials science, particularly in relation to advanced manufacturing techniques for metals.

I.J. Feinberg

This report examines the influence of various hardening variables on the mechanical properties of Type 431 stainless steel. The objective is to determine how alterations in hardening processes affect the material's performance characteristics, which is crucial for applications in demanding environments. The methodology involves a comprehensive analysis of the cooling rates and delays during the hardening process, along with microstructural examination of the steel specimens. By conducting controlled experiments, the resulting mechanical properties, such as tensile strength and toughness, were systematically documented and correlated with the varying hardening techniques employed. The findings indicate significant relationships between the hardening methods and the resulting microstructure and properties of the stainless steel. Specifically, variations in cooling time and temperature yield distinct mechanical behaviors, suggesting optimized conditions for improved performance in practical applications. Furthermore, the analysis of carbides and other microstructural features reveals insights into the underlying mechanisms that govern the material's response to hardening. This understanding is essential for enhancing the effectiveness of stainless steel in engineering applications, especially in the aerospace and defense sectors.

Kelcey Garza, Eric Welte

This report presents the findings of a project aimed at achieving lifetime energy savings through the advanced manufacturing of low-density steels specifically designed for transportation applications. The objective was to investigate and enhance the manufacturing processes that could lead to significant energy savings over the lifecycle of the steel products. Methodologically, the project engaged in a series of experimental studies, collaborative efforts with partner organizations including Colorado School of Mines and Oak Ridge National Laboratory, and comprehensive analysis of energy use and emissions associated with steel production. Results indicated that the use of advanced manufacturing techniques and low-density steel formulations not only resulted in improved performance of steel products in transportation but also contributed to substantial reductions in energy consumption and greenhouse gas emissions. The successful outcomes of this project underscore the importance of innovative manufacturing practices in achieving energy efficiency goals in the steel industry, thereby promoting sustainable transportation solutions. Through collaboration with regulatory and industry partners, the findings also offer valuable insights for future research and development initiatives in the domain of energy-efficient manufacturing technologies.

George E. Hicho, John H. Smith

A metallurgical evaluation was conducted to determine if selected castings of 17-4PH stainless steel had been properly heat treated as required by SAE specification AMS-5355D. Optical metallographic analysis and hardness measurements were made on four samples of as-received castings and on selected samples that were homogenized, solution annealed and aged at various temperatures.

Kevin M. McHugh, Enrique J. Lavernia

This report summarizes research results in the project Development and Demonstration of Advanced Tooling Alloys for Molds and Dies. Molds, dies, and related tooling are used to manufacture most of the plastic and metal products we use every day. Conventional fabrication of molds and dies involves a multiplicity of machining, benching, and heat treatment unit operations. This approach is very expensive and time consuming. Rapid Solidification Process (RSP) Tooling is a spray-forming technology tailored for producing molds and dies. The approach combines rapid solidification processing and net-shape materials processing in a single step. An atomized spray of a tool-forming alloy, typically a tool steel, is deposited onto an easy-to-form tool pattern to replicate the pattern’s shape and surface features. By so doing, the approach eliminates many machining operations in conventional mold making, significantly reducing cost, lead time, and energy. Moreover, rapid solidification creates unique microstructural features by suppressing carbide precipitation.

Samuel J. Rosenberg, Thomas G. Digges

This publication provides a detailed examination of the heat treatment processes and the properties of iron and steel. The objective is to summarize the essential information regarding the treatment techniques and the resultant material properties. The methodology involves a comprehensive review of existing literature, alongside data collected from the National Bureau of Standards' own investigations. Results indicate a significant variation in the mechanical properties of iron and steel, including strength, hardness, and ductility, depending on the treatment conditions. This publication serves as an essential reference for professionals and researchers in metallurgy, offering insights into the practical applications of heat treatment in enhancing the performance of iron and steel products.

G. R. Smolik, W. G. Reuter

This technical report addresses the challenges faced during the heat treatment of PBF acoustic filter Unit No. 1, which experienced cracking during initial attempts. The objective was to investigate the effects of prior thermal cycling, solution anneal temperature, and cooling rate from solution anneals on the mechanical properties of Inconel 718 used in these filters. A comprehensive experimental methodology was applied, monitoring stress rupture properties at 1400°F and room temperature age-hardened characteristics to prevent further cracking and ensure compliance with design requirements. The study revealed that adjusting thermal cycling parameters could significantly influence the integrity of the repaired filters. Results indicated that slow furnace cooling and optimal annealing temperatures improved the ductility and strength of the materials, thus enhancing the performance of the acoustic filters under operational conditions. This report provides valuable insights and guidelines for engineers in the aerospace and nuclear industries regarding the processing and treatment of Inconel 718 components.

Glover, Alexandra Gannon, Zappulla, Matthew Lee Salvatore

Recent advancements in high-pressure gas-quench furnaces have enabled them to achieve heat transfer coefficients comparable to oil-quench furnaces across various applications. These furnaces offer numerous benefits, including a smaller footprint, reduced waste generation, and a consistent quench rate over a range of temperatures. This study aimed to evaluate the feasibility of introducing a high-pressure gas quenching furnace at the Sigma facility for the processing of uranium alloys through an experimental matrix. Results from experiments conducted during fiscal years 2021 and 2022 indicated that high-pressure gas quenching may not deliver the necessary cooling rates for uranium-based alloys such as U-6wt%Nb. In contrast, traditional liquid quenching processes demonstrated adequate cooling rates, with maximum surface and core quench rates measured at 51.7 °C/s and 28.8 °C/s, respectively. The findings accentuate the importance of analytical assessments in selecting appropriate quenching methods for uranium alloys and suggest that future work will focus on refining quench rates and analyzing geometric distortion of U-6wt%Nb castings using a traditional oil-quench furnace. This will culminate in a comprehensive technical report detailing the experimental outcomes.

ANCA MARILENA JUBLEANU, Martin Strangwood

The influences of different austenitisation temperatures on the matrix microstructure and mechanical properties (K1C and hardness) of one cast 300M steel have been investigated. The steel has been austenitised at 925 °C for increasing holding times from 1h to 4h and 1025 °C for 2h holding time. Microstructures were examined by optical and scanning electron microscopy. It has been found that higher austenitisation temperatures alter the microstructure, the fine (<600 nm) precipitate population, and subsequently the fracture toughness. The reduced volume fraction of fine particles increased the hardenability of the steel, resulting in an increased percentage of upper bainite, that led to a l.

Robert J. Hamlin

This thesis investigates the microstructural evolution and mechanical properties of simulated heat affected zones in cast precipitation hardened stainless steels 17-4 and 13-8+Mo. The objective is to understand how these materials respond to thermal cycling, which is crucial for their applications in engineering. A combination of experimental techniques, including thermal cycling tests, microstructural characterization, and mechanical testing, was employed to analyze the behavior of these steels under simulated welding conditions. Results indicate that the microstructural changes, such as phase transformations and precipitate distributions, significantly influence the mechanical properties, including hardness and tensile strength. Furthermore, the findings reveal differences in response between the two steel grades due to their distinct compositions and processing histories. This study contributes to the fundamental knowledge required for optimizing the performance of stainless steels in critical applications, thus enhancing their reliability and safety in engineering practices.

Robert J. Hamlin

This thesis investigates the microstructural evolution and mechanical properties of simulated heat affected zones (HAZ) in cast precipitation hardened stainless steels 17-4 and 13-8+Mo. The objective is to understand the impact of thermal cycles on metallurgical characteristics and their consequent mechanical behavior. Utilizing a combination of analytical techniques and thermal simulations, we examine the phase fractions, mean radius, and number density of precipitates within the HAZs, correlating these microstructural changes to mechanical performance. The results reveal significant variations in microstructural features and mechanical properties between the two steel grades under different simulation conditions. Specifically, the findings indicate that the thermal history of these alloys affects their precipitate distribution, which in turn influences hardness and tensile strength. The study contributes to the broader understanding of how heat treatment processes affect the performance of precipitation hardened steels in engineering applications, offering insights into optimization strategies for material processing. Period.

Thomas G. Digges, Samuel J. Rosenberg

This monograph prepared by the National Bureau of Standards provides an extensive overview of the heat treatment processes and properties of iron and steel. The objective is to offer comprehensive guidelines that can enhance the effective application of heat treatment techniques to improve the mechanical properties and performance of these metals in various industrial applications. Utilizing an intricate methodology, the study examines historical practices, contemporary standards, and advancements in heat treatment technologies, all while providing detailed explanations of the underlying principles. The results highlight the correlation between specific heat treatment processes—such as annealing, quenching, and tempering—and the resultant microstructural modifications in iron and steel, which significantly influence their hardness, ductility, and strength. Moreover, the findings stress the importance of adhering to standardized practices to ensure consistency and reliability in material performance. Period.

Thomas G. Digges, Samuel J. Rosenberg

This report presents a comprehensive analysis of the heat treatment processes and properties of iron and steel. The objective is to elucidate the methods employed in heat treating both materials to enhance their performance in various industrial applications. Methodology included experimental evaluations and a thorough review of existing literature on metallurgical practices. Key findings reveal significant correlations between heat treatment techniques, such as quenching and tempering, and the resulting mechanical properties of both iron and steel, including tensile strength, ductility, and hardness. The results indicate that specific heat treatment processes can optimize the characteristics of iron and steel, leading to improved performance in numerous engineering applications. These insights are crucial for industries reliant on metal properties for product reliability and durability. This document serves as a foundational reference for further research and application in the field of metallurgy, particularly concerning the treatment of ferrous materials.

Xiaomei Li

The ever growing demands for high strength aluminium alloys in the aerospace industry have greatly enhanced the development of alloy chemistry and thermo-mechanical treatments for optimisation of mechanical and physical property balance of 7xxx series alloys. The main objective of this work is to provide an understanding of how compositional variations and ageing treatments affect the microstructure characteristics, strength and electrical conductivity balance whilst taking account of toughness for Al-Zn-Mg-Cu 7xxx A1 alloys. This thesis has investigated the effect of compositional variations on microstructure, electrical conductivity (which is a measure of stress corrosion resistance) and yield strength balance of a wide range of Zr-containing and Cr-containing 7xxx alloys. Twenty-two 7xxx A1 alloys within composition windows of 7010, 7x50 and 7x75 aerospace alloys have been studied and modelled. Differential scanning calorimetry (DSC), scanning electron microscopy (SEM) along with energy dispersive X-ray spectrometry (EDS), and transmission electron microscopy (TEM) have been employed to study phase transformation, grain structure, coarse intermetallic particles of these alloys. This has provided useful information on alloy design and thermo-mechanical processing of high strength 7xxx alloys via microstructural control. To provide predictive tools for conductivity and yield strength, two physically based models for conductivity and yield strength have been presented in this thesis.

Samuel Edis Bowden

Cobalt chromium molybdenum (CoCrMo) has many material properties that make it desirable as a medical hip implant. Due to the range of heat treatments available and the resulting material properties that are present in medical device manufacturing using CoCrMo, many implants are not able to withstand both the chemical and physical wear necessary as a hip replacement. This research looks to examine various heat treatments and their resulting properties to find a desirable heat treatment for CoCrMo in hip implant bearing surfaces. This study was accomplished by using five distinct variations of heat treatment on forged CoCrMo alloy that would be used in medical device manufacture. After heat treatment, microstructure analysis, hardness.

Michael A. Aronov, N.I. Kobasko

This report outlines the development and implementation of Intensive Quenching Technology aimed at enhancing the heat treating and forging industries. The primary objective of the project was to demonstrate and validate advanced quenching techniques that improve the mechanical properties of steel components. The methodology involved modifying existing quenching processes, establishing specialized facilities for intensive quenching, and conducting material characterization studies. Key results from the project revealed significant enhancements in performance and efficiency, attributed to the introduction of single part and batch quenching systems, as well as continuous quenching innovations. The findings highlight the potential for these technologies to optimize production and enhance product quality in the metalworking sector. This project was supported by the U.S. Department of Energy under Award No. DE-FC36-03ID 14463.

Thomas G. Digges, Samuel J. Rosenberg

This monograph presents a comprehensive exploration of the heat treatment processes and the resulting properties of iron and steel, critical materials in various engineering applications. The primary objective is to systematically analyze the effects of heat treatment on the mechanical properties, corrosion resistance, and microstructure of these metals. Utilizing experimental methods, the study evaluates different heat treatment techniques, including hardening, tempering, and annealing. Results indicate significant changes in material properties contingent on the heat treatment applied, with implications for industrial processes such as manufacturing and construction. The findings aim to inform best practices for the heat treatment of iron and steel, which are essential for optimizing performance and longevity in engineering applications. This monograph serves as a valuable resource for materials scientists and engineers seeking to enhance their understanding of metal treatment methodologies and their applications.

Dr. Jogendra Majhi

This lecture note provides a comprehensive overview of Heat Treatment Technology as part of the metallurgical engineering curriculum for the 5th semester. The primary objective is to impart essential knowledge on thermal processes that influence the properties of metals, especially focusing on the transformation phases of austenite and the various hardening techniques applicable to steel. Methodologically, the content is structured into 15 weeks, encompassing topics such as solid-state phase transformations, the mechanisms of austenite formation, decomposition processes, and different types of heat treatments including annealing, normalizing, and hardening methods. Throughout the material, various diagrams, such as the Continuous-Cooling Transformation (CCT) diagram, illustrate the practical applications and theoretical principles of heat treatment processes. Results indicate that understanding the impact of factors, such as grain size and alloying elements on hardenability, is crucial for effective metal treatment. The document serves as an academic resource for students to grasp the intricacies of heat treatment technology, ensuring they are well-prepared for further practical applications in metallurgical engineering.

Avala Lava Kumar, D.K. Mishra

This course aims to provide a comprehensive understanding of heat treatment's role in developing the microstructure and properties of metallic materials, with a focus on commercially significant applications. The course covers the theoretical framework surrounding heat treatment, including the kinetic principles of solid-state transformations and the influence of time on phase transformations. Special emphasis is placed on interpreting IT and CT diagrams to predict transformations and the resulting microstructures. Key learning outcomes include the students' ability to explain the necessity of heat treatment and its effects on the final properties of products. The curriculum encompasses the study of hardenability in steels, the factors influencing it, and the application of hardenability curves for selecting steels in various applications. Additional topics include the effects of thermal gradients and phase transformations on distortion and residual stress in heat-treated products, as well as the heat treatment of selected non-ferrous alloys and ferrous alloys. Overall, this course aims to equip students with a fundamental understanding of modern heat treatment processes and reheating principles.

Ir NDALA MUTUNDA ARMAND, Ir MWEVU MUSENGA DIVINE

Ce projet technique s'attaque à la problématique de défaillance prématurée par usure abrasive et fissuration de fatigue des éléments de broyage mécanique fabriqués en acier 42CrMo4. Pour y remédier, notre équipe a conçu, modélisé et testé à l'échelle pilote un cycle complet d'austénitisation à 850 °C suivi d'une trempe étagée dans un milieu polymère et d'un double revenu stabilisateur à 550 °C. Les résultats démontrent l'obtention d'une microstructure 100% martensitique revenue, atteignant une dureté cible homogène de 50 HRC à cœur et une résistance à la traction estimée à 1200 MPa, tout en réduisant la consommation électrique de 15% par rapport aux pratiques empiriques non optimisées.

Emmanuel Miji

This manual serves as a comprehensive collection of procedures for the efficient, safe operation of a typical copper concentrator. Its objective is to consolidate existing procedures and introduce any that were previously unwritten, ensuring that operators have clear guidance on essential tasks. The methodology involves a systematic presentation of these procedures, tracing the workflow from the introduction of ore to the weighing of concentrates prior to shipment. Key components such as purpose, scope, responsibilities, hazards, and necessary personal protective equipment (PPE) are outlined in detail. Moreover, detailed procedural steps for critical operations, like the cleaning of the vibrating grizzly feeder (VGF), are provided to prevent equipment damage and ensure safety. Participants in the development of these procedures are acknowledged for their contributions. The resulting structured approach aims to enhance operational safety and efficiency within the mining industry, ultimately preparing the workforce for the challenges that arise in concentrator operations.

Dr. R. SAKER OUARGLI

L'évolution de la chimie et de la pétrochimie a favorisé l'utilisation croissante de turbomachines, notamment des pompes, des compresseurs et des turbines, qui répondent aux exigences strictes de rendement, de fiabilité et d'endurance dans les grandes unités chimiques. Cet article se consacre à l'exploration des pompes, un type de turbomachine dont le rôle est crucial dans la transformation de l'énergie mécanique en énergie hydraulique. En analysant leur fonctionnement, il est démontré que les pompes permettent de surmonter les différences de niveau en transportant des liquides ou en augmentant la pression des fluides. De plus, l'article propose une classification des pompes en tant qu'actionneurs, soulignant leur capacité à opérer dans des circuits fermés et ouverts. Par des exemples pratiques, telles que les pompes à huile de voiture et le pompage d'eau, cet article met en lumière l'importance des pompes dans divers processus industriels. Ainsi, ce chapitre introduit des concepts fondamentaux relatifs aux turbomachines, tout en soulignant leur rôle prépondérant dans le secteur pétrochimique.

Claude CHEVASSU

Cet ouvrage traite des principes fondamentaux de l'électronique de puissance, un domaine essentiel dans le développement des systèmes électroniques modernes. L'objectif est de fournir une compréhension détaillée des différents types de convertisseurs statiques et de leurs composants. Pour ce faire, une méthodologie pédagogique est utilisée, comprenant l'exposition de concepts théoriques, des explications sur le fonctionnement des dispositifs, et des exemples pratiques. Les résultats présentés permettent aux lecteurs de saisir les notions de base concernant les dipôles, leur classification dynamique, ainsi que la protection des composants. De plus, des études de cas sur les machines à courant continu et les hacheurs, ainsi que sur les gradateurs et les onduleurs, illustrent les applications de ces principes dans des contextes réels. Cet ouvrage sert de guide complet pour les étudiants et professionnels souhaitant approfondir leurs connaissances en électronique de puissance.

J.M. Dutertre

Ce document présente un cours complet sur l'automatique linéaire, abordant les systèmes dynamiques, leurs modélisations, et les critères de stabilité. L'objectif principal est d'introduire les concepts fondamentaux liés à l'automatique pour mieux comprendre les systèmes asservis. La méthodologie comprend des définitions claires, des explications sur les différents types de systèmes (premier, second ordre et d'ordre supérieur), ainsi que l'analyse des performances et des corrections à appliquer. Les résultats montrent l'importance de comprendre la dynamique entre l'entrée et la sortie d'un système, le régime permanent versus le régime transitoire, et mettent en avant les critères de stabilité tels que Routh-Hurwitz. Les annexes fournissent des ressources supplémentaires, notamment des modèles mathématiques et des applications pratiques, permettant ainsi une compréhension approfondie des concepts partagés. Ce cours est essentiel pour quiconque souhaitant se familiariser avec le domaine de l'automatique et les systèmes contrôlés. Il constitue une base solide pour des études avancées et des recherches dans ce domaine.

Ass. Msc TSHIFIKA SONY Chadrack R.

This document is an instructional chapter on the performance of positive displacement (volumetric) pumps and the factors that influence it. It first examines the physical properties of liquids—viscosity (dynamic and kinematic), lubricity/onctuosity, volatility, corrosion, and abrasion—and explains how each property affects pump operation, wear, and compatibility. It then analyzes key mechanical factors such as rotational or translational speed, torque, operating and test pressures, and temperature, emphasizing their limits, interdependence, and impact on pump sizing, safety, and reliability. Finally, it discusses sealing (static and dynamic) and presents common sealing solutions—baffles, packing glands, O-rings, and lip seals—along with their operating ranges, advantages, limitations, and suitability depending on the fluid and service conditions.

CT MAPENDO KABYABU Feja

This course, “Calcul des Structures I,” is intended for third-year civil engineering students and focuses on the analysis of structures, as a continuation of the course in Elasticity and Strength of Materials. It aims to provide classical calculation techniques for hyperstatic structures, particularly beams and multi-bay, multi-story frames used in buildings. The course emphasizes determining critical loads and calculating several types of hyperstatic structures rather than designing stability itself, making it essential for the conception, analysis, sizing of new works, and verification of existing structures. Prerequisites include a solid knowledge of strength of materials, and success requires active participation, mastery of prior courses, and personal rigor. The planned content covers displacement calculation, buckling associated with simple bending, plastic analysis and ultimate load, the force method, the rotation method, and the Hardy Cross method, with a balanced theoretical and practical organization (60 hours each). Students are evaluated through tests, practical work, tutorials, and a final exam, supported by a specialized bibliography in structural analysis and strength of materials.

Pr. L. MEVA’A

La maintenance industrielle a évolué d'une simple réponse aux dysfonctionnements à une approche proactive visant à prévenir ces complications. Cette transformation a suivi les grandes révolutions industrielles, où la production de masse a établi la maintenance comme une fonction essentielle de l'entreprise. Ce texte explore les origines et l'évolution de la maintenance, ainsi que les défis contemporains auxquels elle fait face, notamment l'intégration des technologies informatiques et la pression croissante pour satisfaire des critères de coûts, délais et qualité. À l’ère moderne, la maintenance doit être réactive et adaptable, tenant compte de divers facteurs incertains qui affectent la planification et la gestion des équipements. Les notions de fiabilité, maintenabilité et disponibilité sont également examinées, en tant que standards clés pour assurer le bon fonctionnement au sein des processus de production. En somme, la recherche d'une maintenance efficace et progressive est mise en avant comme un élément crucial dans le contexte industriel actuel.

Pierre Kamulete Mudianga, Pierre KALULETE MUDIANGA

C’est précisément en vue d’aider des ingénieurs civils des mines qui ont affaire de près ou de loin aux décisions d’investissement que le présent cours a été rédigé. Ce dernier complète le cours des projets des mines souterraines et à ciel ouvert dont il constitue la mise en pratique. Le cours qui donne particulièrement dans le troisième chapitre des critères de rentabilité à examiner lors d’une étude d’un projet d’investissement est complété par des exercices numériques. Il est intéressant de faire remarquer que toutes les règles que l’on peut trouver sont plus le fruit de l’expérience que le résultat ‘une approche scientifique de la question. Que le Maître Ingénieur MWENGE KAHINDA Jean-marc trouve ici l’expression de notre reconnaissance pour l’édition soignée de ce cours.