The Austenite Grain Growth Behavior of Low Carbon Gear Steel 18CrNiMo7-6
YANG Shaopeng1,2, YU Wenchao1, HU Fangzhong2, WANG Maoqiu1, WANG Kaizhong2, WANG Zimin2, SHI Jie1
1 Institute of Special Steel, Central Iron and Steel Research Institute, Beijing 100081, China 2 Technology Center, Ma'anshan Iron and Steel Co., Ltd., Ma'anshan 243000, China
Abstract: The austenite grain growth behavior of low carbon gear steel 18CrNiMo7-6 under different heating conditions was studied by metallographic technique, and an Arrhenius growth model for the average austenite grain size was established,then was optimized by using time exponent. The results showed that the average austenite grain size gradually increased with the temperature and time increasing from 1 173 K to 1 373 K, and the sensitivity to temperature was higher than that to time,and the apparent coarsening temperature was 1 273 K. The classical Arrhenius growth model for austenite grain size was established: D=2.223×106exp[-132 086/(RT)]tn, with the activation energy Q=132.086 kJ/mol. The time exponent n approximately coincided the S-type function with the change of temperature, and the relevant mathematical equation was established: n=0.077 5+0.231 7/(1+10(1 326.73-T)×0.023 5),which was used to optimize the time exponent in the Arrhenius equation considering alloy-element. The calculated value of average austenite grain size was compared with the measured value after optimization, and the results show that the consistency of the model was better than that of the unoptimized model.
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2021, Vol. 35 
