Influence of controlled forging and cooling process on microstructure evolution of GCr15 bearing steel

doi:10.13251/j.issn.0254-6051.2020.09.025

Abstract

Abstract: Microstructure evolution and network carbide distribution of GCr15 bearing steel treated by traditional process and controlled forging and cooling process were comparatively studied by using the way of microstructure characterization.And the statistics and analysis about change rules of grain size and retained austenite content under different processes were made.The results show that after treating by controlled forging and cooling process,the microstructure of granular pearlite in GCr15 bearing steel is relatively smaller,the distribution of C element in the matrix after quenching and rolling is more uniform,and the Rockwell hardness is increased by 0.7 HRC.In addition,the retained austenite content of GCr15 bearing steel is decreased,accompanied with the refinement of carbide particle,and the average particle size is decreased by more than 40%,meanwhile,the formation of coarse carbide network is inhibited.In addition,the austenite grain size can be refined to more than 2 grades.

Key words: GCr15 bearing steel, controlled forging and cooling process, martensite, carbide, grain size

CLC Number:

TG162.83

Hu Linzhuang, Guo Hao, Lei Jianzhong, Liu Yang, Du Sanming, Zhang Yongzhen. Influence of controlled forging and cooling process on microstructure evolution of GCr15 bearing steel[J]. Heat Treatment of Metals, 2020, 45(9): 134-138.

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