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中文摘要：
用Gleeble1500型热模拟机进行了单道次压缩变形试验，分析了不同变形工艺参数对Q345钢奥氏体晶粒尺寸的影响规律，根据试验结果，建立了动态再结晶数学模型及其材料数据库，并写入Marc用户子程序，利用有限元软件Marc和热力耦合弹塑性有限元法模拟了试样的压缩过程，分析计算了采用不同再结晶模型得到的再结晶晶粒尺寸。结果表明：新建立的动态再结晶模型计算的奥氏体晶粒尺寸与实测值吻合很好。
英文摘要：
Single pass compression tests were processed by Gleeble1500 thermal simulator in order to analyze the effects of different deformation parameters on austenite grain size. According to experimental results, the model of dynamic recrystallization and the material database of Q345 steel were made up and written in the material subprogram of Marc. Thermal-coupled Elastic-plastic finite element method was used to simulate the compress process of sample by finite element software-Marc. Different recrystallization functions were applied to simulate and calculate the grain size respectively. The results show that the austenite grain size calculated by the new dynamic recrystalliation model is in good agreement with the measured.
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