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SA508-3钢由于其优良的力学和理化性能而被广泛应用于核电大型锻件的制造。为了控制锻件的形状,并掌握大型锻件成形过程中开裂破坏和微观组织的演化规律。将SA508-3钢的流动应力模型、热成形开裂模型及微观组织演变模型通过软件二次开发与DEFORM-3D集成,建立了热锻成形多尺度模拟系统,并通过实验验证了该系统模拟的准确性。运用该多尺度模拟系统对核电封头-过渡锥体一体化成形进行了全工艺过程模拟,并对锻件形状、开裂趋势和微观组织演化进行了预测和分析。结果表明,锻件的形状得到了良好的控制;锻件在锻造过程中不会发生开裂;温度和应变是影响晶粒尺寸变化的主要因素。
SA508-3 steel is widely used in the manufacture of large nuclear forgings due to its excellent mechanical and physical and chemical properties. In order to control the shape of forgings, and grasp the large-scale forging deformation during cracking and microstructure evolution. The flow stress model, thermoforming cracking model and microstructure evolution model of SA508-3 steel were integrated with DEFORM-3D through the software secondary development. The multi-scale simulation system of hot forging was established, and the simulation accuracy of the system was verified by experiments Sex. The multi-scale simulation system was used to simulate the whole process of nuclear head-transition cone integration. The shape, cracking trend and microstructure evolution of the forging were predicted and analyzed. The results show that the shape of the forging is well controlled; the forging does not crack during the forging; temperature and strain are the main factors that affect the grain size.