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Microstructure Characterization and Corrosion Properties of Nitrocarburized AISI 4140 Low Alloy Steel

Majid Fattah, F. Mahboubi

2011encorrosionmicrostructurenitrocarburizingAISI 4140hardness

Abstract

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This study investigates the microstructure characterization and corrosion properties of plasma nitrocarburized AISI 4140 low alloy steel. The objective was to analyze the effect of treatment temperature on corrosion and hardness properties. Plasma nitrocarburizing treatments were conducted in a gas mixture comprising 85% N2, 12% H2, and 3% CO2 at a chamber pressure of 4 mbar for 5 hours. Various treatment temperatures ranging from 520 to 620 °C were employed. The methodologies included scanning electron and optical microscopy, x-ray diffraction, microhardness measurements, and potentiodynamic polarization techniques in a 3.5% NaCl solution to evaluate treated surfaces. Results indicated that treating at temperatures below 570 °C resulted in the formation of a monophase compound layer, while the layer at 620 °C consisted of two sub-layers supported by an austenite zone followed by a diffusion layer. The thickest diffusion layer corresponded to the sample treated at 620 °C. Microhardness testing revealed a decrease in surface hardness with rising treatment temperatures, establishing a relationship between temperature and material properties. These findings highlight the significance of treatment conditions in optimizing the performance of nitrocarburized AISI 4140 steel.

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Cite This Work

@article{9428a577-4b45-4313-9e8d-42fed51c2830,
  title={Microstructure Characterization and Corrosion Properties of Nitrocarburized AISI 4140 Low Alloy Steel},
  author={Majid Fattah and F. Mahboubi},
  year={2011},
  language={en}
}
TY  - JOUR
TI  - Microstructure Characterization and Corrosion Properties of Nitrocarburized AISI 4140 Low Alloy Steel
AU  - Majid Fattah
AU  - F. Mahboubi
PY  - 2011
LA  - en
ER  -

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