Carbide evolution of GCr15SiMo bearing steel during spheroidizing annealing process

doi:10.13251/j.issn.0254-6051.2023.04.010

Abstract

Abstract: Influence of austenitizing temperature and holding time of isothermal spheroidizing annealing on carbide of GCr15SiMo bearing steel was studied by means of differential scanning calorimetry, scanning electron microscope and other detection and analysis methods and JMatPro thermodynamic software. The results show that with the increase of austenitizing temperature and holding time, the carbides in the GCr15SiMo bearing steel tend to be homogenized and refined, which is beneficial to the spheroidization effect of carbides in the annealing process of the GCr15SiMo bearing steel. Under the isothermal spheroidizing annealing process with austenitizing temperature of 800 ℃ and holding time of 30 min, the GCr15SiMo bearing steel produces a large amount of carbides, small size, high dispersion distribution, the most uniform and compact structure, low hardness and the best spheroidizing effect.

Key words: GCr15SiMo bearing steel, isothermal spheroidizing annealing, carbide, hardness

CLC Number:

TH133.3

Wang Bohui, Xu Taixu, Lu Ming, He Zhijun. Carbide evolution of GCr15SiMo bearing steel during spheroidizing annealing process[J]. Heat Treatment of Metals, 2023, 48(4): 60-66.

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