核电封头-过渡锥体一体化成形全工艺过程多尺度模拟  

Multi-scale simulation on the whole integrated forming process for nuclear pressure vessel head and over cone

作　　者：李馨家 崔振山[1] 冯超[1] 董定乾[1] 尚晓晴 

机构地区：[1]上海交通大学模具CAD国家工程研究中心,上海200030

出　　处：《塑性工程学报》2016年第6期1-7,共7页Journal of Plasticity Engineering

基　　金：国家973课题资助项目(2011CB012903);国家科技重大专项资助项目(2012ZX04012011)

摘　　要：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 for the manufacturing of the nuclear heavy forgings due to its good mechanical properties and physical-chemical performances. A multi-scale simulation system was established to control the shape and investigate the evo- lution of cracking and microstructure in the hot forming process of the heavy forgings. In this system, the flow stress model, hot forming cracking model and microstructural evolution models for SA508-3 steel were integrated into a commercial finite element code DEFORM-3D by embedding user subroutines. The experiments were implemented to verify the accuracy of the multi-scale simulation system. Finally, the whole integrated forming process of the nuclear pressure vessel head and over cone was simulated by using this system. The simulated results indicate that the shape of the forging is well controlled, the forging has no crack in the forming process, and the temperature and strain are the main factors which affect the change of the grain size.

关 键 词：SA508-3钢 开裂 一体化成形 微观组织演变 核电封头-过渡锥体 多尺度模拟 

分 类 号：TG316.2[金属学及工艺—金属压力加工] TG319