基于RVE汽车用TRIP钢变形过程亚稳组织演变分析  

Analysis of metastable structure evolution in deformation process based on RVE for automotive TRIP steel

作　　者：刘建辉 王少英 LIU Jian-hui;WANG Shao-ying(College of Automotive Engineering,Huanghe Jiaotong University,Jiaozuo 454950,China)

机构地区：[1]黄河交通学院汽车工程学院,河南焦作454950

出　　处：《塑性工程学报》2020年第8期136-145,共10页Journal of Plasticity Engineering

基　　金：河南省科技厅科技攻关计划项目(182102210097)。

摘　　要：针对TRIP钢变形过程中亚稳组织演变进行模拟分析,根据单向拉伸、双相拉伸和平面应变等试验的特点,采用ABAQUS建立有限元模型,基于代表性体积元研究不同变形过程中的应力应变分布、宏观变形行为以及残余奥氏体转变对微观力学行为的影响。结果表明:残余奥氏体转变在双轴拉伸下快于平面应变状态,平面应变状态快于单轴拉伸应变状态;各种应变状态下在小变形区域应力主要集中在初始"硬相"贝氏体上,而随着变形的继续,残余奥氏体将逐渐转变为马氏体;单轴拉伸状态下"软相"铁素体在前期的塑性应变较高,而随着应变量的增大,铁素体发生明显的加工硬化,与贝氏体的强度差减小,应变集中程度降低;双轴拉伸状态下该现象更加明显,没有出现明显的应变集中。The metastable microstructure evolution of TRIP steel during deformation process was simulated. According to the characteristics of uniaxial tension,biaxial tension and plane strain test,finite element model was established based on ABAQUS. The effects of stress and strain distribution,macroscopic deformation behavior and residual austenite transformation on micromechanical behavior during different deformation processes were studied based on representative volume element( RVE). The results show that the residual austenite transformation under biaxial tension is faster than that under the plane strain state,and the plane strain state is faster than the uniaxial tension strain state. The stress in the small deformation region is mainly concentrated on the initial ’ hard phase’ bainite under various strain conditions,and as the deformation continues,the residual austenite gradually transforms into martensite. Under the uniaxial tension state,the’ soft phase’ ferrite has a higher plastic strain in the early stage,but with the increase of strain,the ferrite has obvious work hardening,the strength difference with bainite decreases,and the strain concentration degree decreases. Under biaxial tension state,this phenomenon is more obvious,and no obvious strain concentration appears.

关 键 词：相变诱发塑性钢 变形方式 代表性体积元 亚稳组织 

分 类 号：TG441.8[金属学及工艺—焊接]