Numerical simulation and experimental verification of effect of quenching medium on quenching microstructure and hardness of 42CrMo steel rod

doi:10.13251/j.issn.0254-6051.2020.01.012

Abstract

Abstract: Based on finite element method, the microstructure, hardness and temperature changes at various positions of ø40 mm 42CrMo steel round rod specimens were analyzed when the specimens quenched by quenching oil and PAG aqueous solution respectively, and the simulation results were verified by hardness test and microstructure analysis.The results show that the surface microstructure of the specimens changes from austenite to martensite and bainite, and the core microstructure changes from austenite to bainite. Using PAG aqueous solution quenching, the surface microstructure of the specimen is almost transformed into martensite, and the core into martensite and bainite. After quenching by quenching oil and PAG aqueous solution, the surface hardness of the specimens is 58 and 55 HRC respectively, and the hardness decreases gradually from the surface to the core. After quenching by PAG aqueous solution, the hardness of the specimen is about 50 HRC, which is 5 HRC higher than that by quenching oil.

Key words: 42CrMo steel, finite element method, quenching media, microstructure, hardness

CLC Number:

TG156.32

Zhang Wen, Zhu Baizhi, Huang Zhenjian, Wang Zhaohua. Numerical simulation and experimental verification of effect of quenching medium on quenching microstructure and hardness of 42CrMo steel rod[J]. HTM, 2020, 45(1): 56-60.

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