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利用金相实验方法,基于实验数据,应用Beck、Hillert、Sellars数学模型研究了40CrNi2MoE钢在加热温度850~1200℃和保温时间30~480 min下的奥氏体晶粒长大规律。结果表明,随加热温度升高和保温时间延长,40CrNi2MoE钢奥氏体晶粒逐渐长大,当加热温度超过1050℃或保温时间超过120 min时,试验钢奥氏体晶粒开始粗化。通过对Beck、Hillert和Sellars 3种晶粒长大数学模型对比分析,Sellars模型对40CrNi2MoE钢的奥氏体晶粒尺寸预测具有较高的精度,其奥氏体晶粒长大模型方程为:当温度为850℃≤T≤1050℃时,D5.49Sellars=7.64×1021texp(-390081/(RT));当温度为1050℃≤T≤1200℃时,D8.13Sellars=8.04×1041texp(-771322/(RT))。
Based on the experimental data, the rule of austenite grain growth of 40CrNi2MoE steel at 850-1200 ℃ and holding time of 30-480 min was studied by the Beck, Hillert and Sellars mathematical models. The results show that the austenite grains of 40CrNi2MoE steel grow up with the increase of heating temperature and holding time. When the heating temperature exceeds 1050 ℃ or the holding time exceeds 120 min, the austenite grains begin to coarsen. By comparing the mathematical models of the grain growth of Beck, Hillert and Sellars, the Sellars model has higher accuracy in predicting the austenite grain size of 40CrNi2MoE steel. The model equation of austenite grain growth is as follows: when D5.49Sellars = 7.64 × 1021texp (-390081 / (RT)) at a temperature of 850 ° C ≤ T ≤ 1050 ° C; D8.13Sellars = 8.04 × 1041texp (-771322 / (RT)).