Transactions of Materials and Heat Treatment

Title：Microstructure and properties of mechanical bearing steel in multi-directional forging

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ClassificationCode：TG132.25

year,vol(issue):pagenumber：2022,47(4):68-73

Abstract：

In order to improve the wear resistance of mechanical bearing steel at room temperature and high temperature, the multi-directional forging test of GCr15 mechanical bearing steel was carried out, and the microstructure and wear resistance at room temperature of 25 ℃ and high temperature of 350 ℃ for bearing steel before forging and after multi-directional forging were compared and analyzed. The results show that compared with that of before forging, the grains of bearing steel after multi-directional forging are obviously refined, the carbides change from thick fishbone to fine three-dimensional network, which are dispersed and distributed. For mechanical bearing steel, the multi-directional forging reduces its wear volume from 31×10-3 to 16×10-3 mm3 after wear at room temperature for 20 minutes, while its wear volume reduces from 54×10-3 to 22×10-3 mm3 after wear at high temperature for 20 minutes, which indicating that its wear resistance at room temperature and high temperature is significantly improved. Thus, the multi-directional forging is an effective way to improve the wear resistance of mechanical bearing steel at room temperature and high temperature, which has strong industrial practicability.

Funds：

广东省普通高校青年创新人才项目（2020KQNCX159）

作者简介：黄东(1981-)，男，学士，机械工程实验师 E-mail：houndy-d@163.com

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