中锰钢棘轮行为的细观有限元模拟  

Mesoscopic Finite Element Simulation of Ratchetting Behavior in Medium-Manganese Steel

作　　者：畅舒心 张娟(导师)[1] 刘骏华 黄兴民[2] CHANG Shuxin;ZHANG Juan;LIU Junhua;HUANG Xingmin(Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province,School of Mechanics and Aerospace Engineering,2.School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学力学与航空航天学院应用力学与结构安全四川省重点实验室,成都610031 [2]西南交通大学材料科学与工程学院,成都610031

出　　处：《机械工程材料》2024年第2期74-81,共8页Materials For Mechanical Engineering

基　　金：国家自然科学基金面上资助项目(12272325)。

摘　　要：基于微观形貌构建含铝中锰钢二维代表性体积元(RVE)模型,同时引入马氏体相变演化方程,采用Mori-Tanaka均匀化方法构建了奥氏体和马氏体组合相的本构模型,对试验钢在单轴拉伸和不同工况下(平均应力为50 MPa,应力幅分别为700,710 MPa)的棘轮行为进行了细观有限元模拟。结果表明:所建立的均匀化本构模型可以较好地反映马氏体相变对试验钢力学性能的影响,基于RVE模型模拟组织演变具有一定的准确性;马氏体相变会使试验钢的单轴拉伸中发生明显强化,并会使奥氏体和铁素体之间出现应力交替现象;当平均应力为50 MPa、应力幅为700 MPa时,考虑与不考虑马氏体相变模拟的棘轮应变演化曲线几乎重合;当平均应力为50 MPa、应力幅为710 MPa时,不考虑马氏体相变模拟的棘轮应变增长率明显高于考虑相变时。A two-dimensional representative volume element(RVE)model of Al-containing medium-manganese steel was constructed based on the microscopic morphology.The martensitic transformation evolution equation was introduced,and the constitutive model of austenite and martensite composite phase was constructed by Mori-Tanaka homogenization method.The uniaxial tension and the ratcheting behavior under different working conditions(average stress of 50 MPa and stress amplitude of 700,710 MPa)of the test steel were simulated by mesoscopic finite element simulation.The results show that the established homogeneous constitutive model could well reflect the effect of martensitic transformation on the mechanical properties of the test steel.The simulation of microstructure evolution based on RVE model was accurate.Martensitic transformation could significantly make the test steel strengthened obviously during uniaxial tension,and caused stress alternate between austenite and ferrite.When the average stress was 50 MPa and the stress amplitude was 700 MPa,the simulated ratcheting strain evolution curves with and without consideration of martensitic transformation almost coincided,when the average stress was 50 MPa and the stress amplitude was 710 MPa,the simulated ratcheting strain growth rate without consideration of martensitic transformation was significantly higher than that with consideration.

关 键 词：中锰钢 棘轮行为 有限元模拟 均匀化模型 马氏体相变 

分 类 号：TG142[一般工业技术—材料科学与工程]