22CrMo钢渗碳淬火过程组织与应力变化的数值模拟

Numerical Simulation of Microstructure and Stress in Carburizing and Quenching Process of 22CrMo Steel

根据描述渗碳过程的数学模型,利用有限差分法,对22CrMo钢圆柱体试样渗碳过程进行了数值模拟,得出渗碳层中碳浓度分布。基于渗碳模拟结果,根据描述淬火过程的数学模型,利用有限元法对试样淬火过程的温度场、组织场及应力场进行了数值模拟,分析了淬火过程中组织和内应力变化,及渗碳过程对淬火过程组织及应力变化的影响。对渗碳淬火后试样的组织进行了金相分析,并测量了表面和内部各点残余应力,计算值和测量值相吻合。

According to mathematical models for describing the carburization process, the carburization of 22CrMo steel cylinder was simulated by the FDM and the carbon content distribution in carburized layer was obtained. Based on this result, and combined with mathematical models for describing the quenching process, the temperaturc, microstructure and stress field in quenching process were simulated by the FDM, the variation of microstructure and stress in quenching process was analyzed, and effect of the carburization on them was also analyzed. After carburization and quenching, metallographic analysis of the microstructure was done, and residual stresses of some face and inner points were also measured. The calculated results coincide well with measured values.