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大型锻件高温锻造是核反应堆压力容器中重要的热加工工艺，优化的锻造工艺不仅可以满足合格的产品外形尺寸，而且可以获得优良的微观组织性能。采用热力模拟手段研究了核电用钢ＡＳＭＥＳＡ５０８－３的动态软化微观机制与高温锻造热力参数之间的关系，得到了该钢种在不同变形条件下的真应力应变关系、动态再结晶临界应变值、动态再结晶晶粒尺寸与Ｚｅｎｅｒ－Ｈｏｌｏｍｏｎ参数之间的关系。探讨了Ｚ参数的唯一性及在锻造过程中动态再结晶的应用范围，为核电锻件微观组织性能控制锻造提供了必要的力学、物理、材料关系。
Large-scale forging high temperature forging nuclear reactor pressure vessel is an important thermal processing technology, optimized forging process not only to meet the qualified product dimensions, but also to obtain excellent microstructure and properties. The relationship between the dynamic softening microstructure of thermal steel ASMESA508-3 and the thermal parameters of high temperature forging was studied by means of thermal simulation. The true stress - strain relationship, dynamic recrystallization critical strain value, Relationship between dynamic recrystallization grain size and Zener-Holomon parameters. The uniqueness of Z parameter and the application range of dynamic recrystallization in forging process are discussed, which provide the necessary mechanical, physical and material relations for the forging control of the microstructure and properties of nuclear forgings.