摘要
简要阐述了金属材料热锻过程中组织演变的建模与模拟方法;着重介绍了宏观有限元-介观多层级元胞自动机集成模拟方法,该方法以位错密度为线索,根据"应变/应变速率/温度-位错密度-再结晶-流动应力"之间的宏微观相互影响规律,能够追踪在非均匀/非等温变形条件下,再结晶晶粒的形貌、尺寸和体积分数;同时,介绍了晶体塑性-多层级元胞耦合模拟方法,该方法以实际晶粒的取向为初始组织输入,采用晶体塑性描述晶粒内部变形的应变梯度,并将位错密度和晶粒取向映射到多层级元胞模型中,可以定量描述织构中大晶粒的形成;最后,较为简要地介绍了不锈钢核电大锻件的组织演变数值模拟-物理模拟方法,并归纳了几种方法的优缺点,展望了未来发展趋势。
The modeling and simulation methods of microstructural evolution in hot forging process of metal material were briefly described,and the integrated simulation method of macroscale finite element and mesoscale multi-level cellular automation(MCA)was introduced emphatically.This method took the dislocation density as a clue,and according to the macro-microscopic interaction laws between"strain/strain rate/temperature-dislocation density-recrystallization-flow stress",the morphology,size and completion score of recrystallized grains under non-uniform/non-isothermal deformation conditions were tracked.Then,the crystal plasticity-multi-level cell coupling simulation method was introduced.This method took the actual grain orientation as the initial structure input,used crystal plasticity to describe the strain gradient of the internal deformation of the grain and mapped the dislocation density and grain orientation to multi-level cell model,which quantitatively described the formation of large grains in the texture.Finally the numerical simulation-physical simulation method of the microstructure evolution for the nuclear power large forging of stainless steel was introduced briefly,the advantages and disadvantages of several methods were summarized,and the future development trend was prospected.
作者
陈飞
朱华佳
李佳航
崔振山
Chen Fei;Zhu Huajia;Li Jiahang;Cui Zhenshan(National Engineering Research Center of Die&Mold CAD,Shanghai Jiao Tong University,Shanghai 200030,China)
出处
《锻压技术》
CAS
CSCD
北大核心
2021年第9期16-21,共6页
Forging & Stamping Technology
基金
国家自然科学基金资助项目(51705316,U2037204)。
关键词
热锻
组织演变
宏观有限元模拟
多层级元胞自动机
再结晶织构大晶粒
hot forging
microstructure evolution
macroscale finite element
multi-level celluar automation
large grainsin recrysta-llized texture
