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Lehigh Preserve Institutional Repository

Robert J. Hamlin

2015Englishthermal treatmentheat treatmentphysical metallurgystainless steelprecipitation hardeningmicrostructure

Abstract

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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.

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  title={Lehigh Preserve Institutional Repository},
  author={Robert J. Hamlin},
  year={2015},
  language={English}
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