Effect of cold rolling on microstructure evolution and wear resistance of G20CrNi2MoA carburized bearing steel

doi:10.13251/j.issn.0254-6051.2020.12.010

Abstract

Abstract: Effect of cold rolling on the microstructure evolution and wear resistance of G20CrNi2MoA carburized bearing steel was studied by means of electron backscattered diffraction (EBSD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The results show that the cold rolling can refine the grain size of the raw materials. When the cold rolling reduction increases from 0% to 30%, the area fraction of carbides increases from 4.38% to 5.99% and the average diameter decreases from 0.15 μm to 0.13 μm after the secondary quenching. After the secondary low-temperature tempering, the gradients of both the carbon content and the microhardness are increased within about 0.9 mm depth of the surface carburized layer, the average friction coefficient decreases from 0.489 to 0.346 when the cold rolling reduction increases from 0% to 30%, and the wear rate also decreases from 27.2×10^-6 mm³·N^-1·m^-1 to 9.1×10^-6mm³·N^-1·m^-1. It indicates that the abrasive wear and fatigue are decreased gradually due to the increasing of area fraction of carbides and microhardness of the top surface after 30% cold rolling reduction, thus the wear resistance of the materials increases.

Key words: G20CrNi2MoA carburized bearing steel, cold rolling, microstructure evolution, wear resistance

CLC Number:

TG335.12

Zeng Songwen, Liu Lu, Liu Yujian, Qian Dongsheng, Wang Feng. Effect of cold rolling on microstructure evolution and wear resistance of G20CrNi2MoA carburized bearing steel[J]. Heat Treatment of Metals, 2020, 45(12): 53-59.

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