Austenitic grain growth behavior and model construction of 100CrMo7-3 bearing steel for wind power gearbox

doi:10.13251/j.issn.0254-6051.2025.05.010

Abstract

Abstract: Austenite grain growth behavior at different temperatures (920-1150 ℃) and holding time (0-600 min) of the 100CrMo7-3 bearing steel for wind power gearbox was studied. The austenite grain size was measured by metallographic quantitative method. The austenite grain growth model of the 100CrMo7-3 bearing steel was established by Sellars model and repeated trial method. Based on the austenite grain size at each position of the workpiece under actual production conditions, the austenite grain size at each position at “0” time of the workpiece and the change of austenite grain size with holding time were calculated by DEFORM finite element software. The results show that the austenite grain growth rate is slow when the heating temperature is below 1000 ℃, while the austenite grain growth rate is fast when the temperature is higher than 1100 ℃. At the same heating temperature, the grain growth is rapid during the first 30 min of holding, and gradually slows down after 30 min. The austenite grain growth model of 100CrMo7-3 bearing steel fitted by experimental data is as follows: D^5.02_t-D^5.02₀=7.77×10³⁶texp-764 980RT. Under industrial conditions, due to the influence of specimen size, the austenite grain size of on-site workpieces is larger than that of laboratory specimen. The primary factor affecting the austenite grain size of 100CrMo7-3 bearing steel during the heating and holding process under on-site production conditions is the heating temperature, but the effect of holding time is not significant.

Key words: 100CrMo7-3 bearing steel, large wind power gearbox, austenite grain growth model

CLC Number:

TG161

Shen Xinjun, Wang Yubin, Zhang Yongpeng, Yang Jun, Jiang Peng, Li Shuaibin, Shi Dafang. Austenitic grain growth behavior and model construction of 100CrMo7-3 bearing steel for wind power gearbox[J]. Heat Treatment of Metals, 2025, 50(5): 57-65.

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