中文摘要：

试验测量了超高强度钢G50不同组织的热物性参数与力学性能参数,测定了马氏体相变动力学参数和马氏体相变塑性系数,建立了超高强度钢G50淬火的温度-组织-应力耦合材料模型。通过反传热计算确定了浸油淬火过程中试验件的表面换热系数。使用所建立的材料模型和换热系数,模拟计算了试验件浸油淬火过程中的温度、组织和应力的演化过程,温度计算结果和试验测试结果相吻合。

英文摘要：

The thermal physical parameters and mechanical performance parameters of microstructures of ultra-high strength steel G50 were measured. Martensitic transformation kinetics parameters and the martensitic transformation plasticity coefficient were obtained by experiments. The material temperature-microstructure-stresscoupling model of ultra-high strength steel G50 in quenching process was established. The surface heat transfer coefficient of oil quenching of a test component was determined by the inverse heat transfer calculation.Using established material model of immersion oil quenching and heat transfer coefficients,evolutions of temperature,microstructure and stress in the process of immersion oil quenching were calculated. Calculated temperatures meet experimental results well.