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摘要：
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以热物理模拟试验研究为基础 ,得出 35CrMo钢发生动态再结晶时的数学模型。采用热-力耦合的弹塑性有限元法对 35CrMo结构钢在热变形过程进行了数值模拟。变形的不均匀性导致动态再结晶进行的不等时性 ,动态再结晶的发生初始于大变形区 ,随着应变的增加 ,逐渐向粘着区和自由变形区延伸。同时预测热变形过程的形变量、形变速率和形变温度对再结晶微观组织演变的影响。在一定温度下 ,再结晶晶粒尺寸的大小与应变速率呈反方向变化 ,随着变形的进行 ,试样内的晶粒尺寸趋于细化和均匀化。在一定应变速率下 ,随着形变温度的降低 ,再结晶晶粒尺寸趋于细化 ,导致了锻件的综合性能提高。为了观察显微组织演化过程 ,对模拟结果进行了金相法验证 ,模拟结果与实验结果比较吻合 ,模拟的结果是合理的
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By integrating the thermo-mechanical coupled FEM with mathematical model of microstructure evolution, the paper proposes a numerical prediction method for microstructure evolution of DRX during hot deformation and subsequent SRX process on the MARC FEM software platform. As an application, the microstructure evolution of 35CrMo steel during hot deformation and subsequent SRX is simulated. The effect of strain, strain rate and deformation temperature on the evolution of microstructure is predicted. At a certain temperature, the change of DRX grain size is in verse with the strain rate, and with the proceeding of deformation the grain size is refined and heterogeneous; At the same time, at a certain strain rate, the change of DRX grain size is refined with the decreasing of deformed temperature, which can improve the property of forged piece. The simulation results agree well with the experimental results shows that the method is able to successfully predict the microstructure of metals during hot deformation and after hot deformation.
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基金项目：
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作者简介：
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参考文献：
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1 沈豫立等金属零件热处理应力与变形的计算武汉:华中理工大学出版社,1993
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