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21 October 2024 Microstructure evolution and hardening mechanism of 18Cr2Ni4WA steel during combined carburized and carbonitrided treatment
Xiaojun Yang, Ke Chen, Yuedong Yuan, Qiyuan Chen, Lei Wang, Xiaonan Wang, Chao Li, Liyuan Zhao, Ye Pu
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Proceedings Volume 13401, International Conference on Automation and Intelligent Technology (ICAIT 2024); 134010P (2024) https://doi.org/10.1117/12.3051031
Event: 2024 International Conference on Automation and Intelligent Technology (ICAIT 2024), 2024, Wuhan, China
Abstract
Microstructure evolution and hardening mechanism of 18Cr2Ni4WA steel subjected to combined high-temperature carburizing, two high-temperature tempering, carbonitriding, quenching, low-temperature treatment, and low-temperature tempering heat treatment were investigated in this study. The effect of surface precipitation phases and retained austenite on surface hardness after different heat treatments was studied throughout the process. The results indicated that the combined treatment converted the lath martensite (LM) surface layer into acicular martensite (AM), carbide and residual austenite (RA). Furthermore, subzero treatment led to the improvement of mechanical properties through the reduction of residual austenite and the increase of carbide. The deformation of the martensite lattice and the compressive stress within the retained austenite are reduced through low-temperature tempering, which led to a decrease in austenite stability, facilitating its transformation into martensite. This study deepens the current understanding of the hardening mechanism of 18Cr2Ni4WA steel during carburizing carbonitriding composite heat treatment, providing a theoretical basis and experimental basis for expanding its application fields.
© (2024) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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Xiaojun Yang, Ke Chen, Yuedong Yuan, Qiyuan Chen, Lei Wang, Xiaonan Wang, Chao Li, Liyuan Zhao, and Ye Pu "Microstructure evolution and hardening mechanism of 18Cr2Ni4WA steel during combined carburized and carbonitrided treatment", Proc. SPIE 13401, International Conference on Automation and Intelligent Technology (ICAIT 2024), 134010P (21 October 2024); https://doi.org/10.1117/12.3051031
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KEYWORDS
Heat treatments
Quenching
Scanning electron microscopy
Crystals
Carbon
Deformation
Diffraction
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