Influence of quenching process on microstructure and wear resistance of GCr4Mo4V steel

doi:10.13251/j.issn.0254-6051.2023.09.004

Abstract

Abstract: Annealed GCr4Mo4V steel prepared by the process of “VIM+ESR” was oil quenched at 1090, 1120 and 1150 ℃ for 30, 60 and 120 min respectively, and then tempered three times continuously. The dry wear test was carried out on UMT TriboLab wear tester, and the evolution of its microstructure, surface hardness, wear scratch morphology and wear rate were analyzed, and the influence of quenching process on the microstructure and dry wear characteristics of the GCr4Mo4V steel were investigated. The results show that the quenching temperature of 1150 ℃ is the critical temperature for the rapid growth of grains. The increase of quenching temperature promotes the dissolution of large particle carbides. The prolongation of holding time is more conducive to the dispersion distribution of carbides after tempering. The quenching temperature has a greater effect on the refinement of large particle carbides than the holding time. The refinement and dispersion of grain structure and carbides have a positive effect on the improvement of wear resistance of the GCr4Mo4V steel.

Key words: quenching, high temperature bearing steel, microstructure, wear resistance

CLC Number:

TG142.1

Cui Yi, Cui Jihong, Wang Yan, Zhang Yunfei, Yu Feng, Zhao Yingli, Cao Wenquan. Influence of quenching process on microstructure and wear resistance of GCr4Mo4V steel[J]. Heat Treatment of Metals, 2023, 48(9): 23-29.

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