【摘要】 提出了流变应力的描述方法，该方法考虑了热变形时组织演化的影响．在此基础上，提出了一种新的金属热变形时组织演化的模拟方法，并确定了组织演化模拟程序中一些关键性因素，还讨论了冷却过程中的组织变化和性能预报问题．对Ｑ２３５低碳钢的双道次压缩过程的组织演化情况进行了模拟，并和实验结果进行了对比．更多还原

【Abstract】 A method used to describe the stress-strain curve is firstly put forward. In this method, the influence of microstructure evolution is considered. On this basis, a new simulation method of microstructure evolution during hot deformation is also raised. Some key factors, such as the minimum local microstuucture volume and the minimum deformation incremental step are determined too. The prediction of mechanical properties after cooling is discussed subsequently. Finally, the two pass upsetting process of Q235 low carbon steel is simulated, and the test results agree well with that of the simulation.更多还原