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对中碳34CrNiMo合金钢在加热温度900~1200℃和保温时间0~360 s下的奥氏体晶粒演化行为进行了研究。结果表明,随着加热温度的升高和保温时间的延长,奥氏体晶粒尺寸呈现逐渐增大的趋势。基于晶粒长大的Sellars模型,通过线性回归方法建立34CrNiMo钢加热时奥氏体晶粒长大的数学模型。将晶粒长大模型预测结果与实验结果进行比较,符合良好,表明该模型能够较好地预测34CrNiMo钢奥氏体晶粒长大行为。
The austenite grain evolution behavior of 34CrNiMo alloy steel at medium temperature of 900-1200 ℃ and holding time of 0-360 s was studied. The results show that with the increase of heating temperature and holding time, the grain size of austenite tends to increase gradually. Based on the Sellars model of grain growth, a mathematical model of austenite grain growth during heating of 34CrNiMo steel was established by linear regression method. The prediction results of the grain growth model are compared with the experimental results, which is in good agreement. It shows that this model can predict the austenite grain growth behavior of 34CrNiMo steel well.