Effect of magnetic cryogenic treatment on wear resistance of 42CrMo steel

doi:10.13251/j.issn.0254-6051.2020.01.018

Abstract

Abstract: Based on the temperature field provided by the cryogenic treatment and the uniform magnetic field provided by the permanent magnet, 42CrMo alloy steel was heat treated by magnetic cold field cryogenic process, and then compared with 42CrMo treated by conventional process and cryogenic treatment. The results show that the magnetic cooling process further improves the wear resistance of 42CrMo material on the basis of the cryogenic treatment process. The wear resistance of the magnetic cooling process is about 26.7% and 22.2% higher than that of the conventional process and the cryogenic process, respectively. The cryogenic treatment provides a temperature field that further converts the retained austenite to martensite; The cryogenic treatment also causes the supersaturated martensite to precipitate a large amount of carbon and form a large amount of carbides. The presence of a magnetic field in the cryogenic treatment acts on the α-Fe lattice, which optimizes the direction of carbon precipitation from supersaturated martensite, and the tempered troostite gathers compactly in the direction of magnetic field and improves the wear resistance.

Key words: magnetic field, cryogenic treatment, 42CrMo steel, wear resistance

CLC Number:

TG156.91

Jiang Yijiang, Yan Xianguo, Chen Zhi, Hou Qiang, Chen Zhigang. Effect of magnetic cryogenic treatment on wear resistance of 42CrMo steel[J]. HTM, 2020, 45(1): 91-95.

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