四川轻化工大学学报（自然科学版）2025，Vol.38Issue(1)：1-10,10.DOI:10.11863/j.suse.2025.01.01
中锰TRIP钢棘轮行为的晶粒尺寸依赖性相场研究
A Phase-field Study on the Grain Size Dependence of the Medium-Mn TRIP Steel Ratcheting Behavior
摘要
Abstract
Based on the Ginzburg-Landau and crystalline plasticity theory,a two-dimensional polycrystalline elastoplastic phase-field model has been established,which can reasonably reflect the grain size dependence.The effect of grain size on ratcheting behavior of medium-Mn TRIP steel is studied by combining the phase-field with finite element method.The simulated results show that the resistance of the material to plastic deformation and the stability of austenite gradually increases with the decrease of grain size,and the cyclic stability of medium-Mn TRIP steel is enhanced.With the decrease of grain size,the TRIP effect in polycrystalline systems gradually weakens,resulting in a decrease in both the ratcheting strain rate and the content of martensite generated from phase transformation.When the grain size decreases from 1.0 μm to 0.2 μm,the ratcheting strain and martensite content decrease by 0.69%and 11.1%,respectively,at the end of the cycle.The grain-size dependence of ratcheting behavior in medium-Mn TRIP steels can be elucidated as follows:as the grain size diminishes,the resistance to dislocation slip of the phases and the hindrance of dislocation movement by grain boundaries in TRIP steels increase,leading to the reduction in plastic deformation induced by dislocations.Simultaneously,the mechanical stability of austenite increases with the decrease of grain size,causing a decrease in martensitic transformation and phase-transformation-induced plastic strain within the polycrystalline system.Consequently,the initiation and accumulation of plastic deformation during cyclic loading are restrained,resulting in a diminished ratcheting effect in medium-Mn TRIP steels.关键词
中锰钢/晶粒尺寸/棘轮行为/马氏体相变/相场法Key words
medium-Mn steel/grain size/ratcheting behavior/martensitic transformation/phase-field method分类
数理科学引用本文复制引用
杨云俊,畅舒心,张娟..中锰TRIP钢棘轮行为的晶粒尺寸依赖性相场研究[J].四川轻化工大学学报（自然科学版）,2025,38(1):1-10,10.基金项目
国家自然科学基金项目(12272325) （12272325）
