摘要
采用多相场(Multi-phase-field,MPF)模型模拟动态再结晶晶粒的生长过程,并用Kocks-Mecking(KM)方程模拟其力学行为。用热力模拟机对SA508-3钢进行了不同温度和应变速率下的热压缩试验,从热压缩流动应力-应变曲线中提取SA508-3钢动态再结晶特征参数并用于计算动态再结晶模型参数。利用所得参数对SA508-3钢的动态再结晶过程进行了多相场模拟,预测了热塑性变形过程中的组织演变和真应力-真应变曲线,与试验结果吻合较好。试验和数值结果均表明,流动应力随应变速率的增大及变形温度的降低而增大。本文的方法可用于研究其它材料的动态再结晶行为,为优化热锻工艺提供指导。
A multi-phase-field( MPF) model was adopted to simulate the growth of dynamical recrystallization( DRX) grains and the KocksMecking( KM) equation to model the mechanical behavior. Hot compression tests under various temperatures and strain rates were carried out by using a thermo-mechanical simulator to obtain the flow stress-strain curves,from which the MPF-DRX simulation model parameters for SA508-3 steel were extracted and calculated. The microstructure evolution and the flow stress-strain curves in hot plastic deformation process predicted by the MPF-DRX simulation agree well with the experimental results. Both the experimental and numerical simulation results indicate that the flow stress increases with the increase of strain rate as well as with the decrease of deformation temperature. The strategy of the present study can be used to study the DRX behavior of other materials and provide a guidance for optimizing hot forging processes.
作者
许婷
李梅娥
吴冰洁
杜华
王晓童
方亮
Xu Ting;Li Meie;Wu Bingjie;Du Hua;Wang Xiaotong;Fang Liang(State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an Shaanxi 710049,China;Key Lab of Nuclear Reactor System Design Technology,Nuclear Power Institute of China,Chengdu Sichuan 610200,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2020年第10期204-211,共8页
Heat Treatment of Metals
关键词
SA508-3钢
动态再结晶
多相场模型
流动应力
微观组织演化
SA508-3 steel
dynamic recrystallization
multi-phase-field simulation
flow stress
microstructure evolution
