不锈钢等温等速压缩微观组织演变仿真及实验  

Simulation and experiment on microstructure evolution of stainless steel during isothermal and uniform compression

作　　者：金明[1] 杨平[2] JIN Ming;YANG Ping(School of Vehicle Engineering,Chongqing Industry Polytechnic College,Chongqing 401120,China;Institute of Intelligent Manufacturing and Automotive,Chongqing Technology and Business Institute,Chongqing 401520,China)

机构地区：[1]重庆工业职业技术学院车辆工程学院,重庆401120 [2]重庆工商职业学院智能制造与汽车学院,重庆401520

出　　处：《塑性工程学报》2022年第4期144-150,共7页Journal of Plasticity Engineering

基　　金：2019重庆市教委科学技术研究项目(KJQN201904001)。

摘　　要：为了避免常见微观组织模拟方法的缺陷,提出了使用更高维度场变量的零值等高线来模拟晶界演化的策略,构建了动态再结晶模型,并对其微观组织演变过程进行了模拟。将水平集函数的场变量计算和有限元模拟相结合对304不锈钢的动态再结晶过程进行了模拟,并通过金相实验进行了验证。结果表明,模拟结果与实验结果较为吻合,水平集方法的模拟精度较高。变形开始时,原始等轴晶被逐渐拉长,随后在晶界形核;随着应变量的增大,形核数目逐渐增多且晶粒得到细化,当应变为0.6左右时,晶粒尺寸达到最小;当应变继续增加时,形核减缓,晶粒以长大为主。To avoid the defects of common microstructure simulation methods,the strategy that using zero-value contour of higher dimensional field variable to simulate the grain boundary evolution was proposed,the dynamic recrystallization model was constructed,and the microstructure evolution process was simulated.The dynamic recrystallization process of 304 stainless steel was simulated by combining the field variable calculation of level set function with finite element simulation and verified by metallographic experiments.The results show that the simulation results are in good agreement with the experimental results and the simulation accuracy of level set method is high.At the beginning of deformation,the original equiaxed grains are gradually elongated and then nucleated at the grain boundary.With the increase of deformation amount,the number of nucleation gradually increases and the grain is refined.When the strain amount is about 0.6,the grain size reaches the minimum.As the increase of nucleation slows down,the grain growth accounts for the majority.

关 键 词：动态再结晶 水平集 热变形 微观组织演变 

分 类 号：TG316[金属学及工艺—金属压力加工]