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根据高精度差分膨胀仪测量的42Cr Mo钢不同加热速度下奥氏体化膨胀量,获得了奥氏体化过程相关的动力学信息,并利用基于JMAK方程的扩展解析动力学方法拟合了考虑加热速度影响的42Cr Mo钢奥氏体化过程动力学模型。拟合结果与实验结果吻合很好;等速加热时,奥氏体化时间与加热速度满足双对数线性关系。利用扩展动力学解析模型和叠加原理,预测了某曲轴42Cr Mo钢加热速度连续变化的电磁感应加热过程中的奥氏体化过程,为后续淬火过程预测提供了组织准备,为加热速度连续变化的加热过程奥氏体化提供了一种预测方法。
The kinetic information related to the austenitization process was obtained according to the amount of austenitizing expansion of 42Cr Mo steel at different heating rates, which was measured by a high precision differential dilatometer. The kinetic information of the austenitization process was fitted by using the extended analytical kinetic method based on the JMAK equation Austenitization kinetics model of 42Cr Mo steel affected by heating rate. The fitting results are in good agreement with the experimental results. The austenitizing time and the heating rate meet the double logarithmic linear relationship at the same speed. Based on the extended dynamic analysis model and superposition principle, the austenitization process of electromagnetic induction heating with continuous heating of 42Cr Mo steel in a crankshaft was predicted, which provided the organization preparation for the subsequent quenching process prediction. In order to continuously change the heating rate Austenitizing the heating process provides a predictive method.