摘要
采用全场晶体塑性模拟研究了不同取向粗晶对316LN不锈钢混晶组织微区不均匀塑性变形的影响。通过Monte-Carlo法模拟生成4种不同取向粗大晶粒的混晶组织代表体元模型,并对其施加单向拉伸的周期边界条件。定量分析了混晶组织在拉伸变形过程中的应力和应变分布的宏微观特征。研究结果表明,所有的混晶组织在晶粒层面上均显示出明显的塑性变形不均匀性,并且粗晶内部的应力和应变均低于其周围细晶组织,硬取向粗晶周围的细晶组织承受更大塑性应变,且具有更高的应力,而软取向粗晶周围的细晶组织则承受相对较小的塑性变形,具有更低的应力。
Full-field crystal plasticity (CP)simulation was employed to investigate the effect of different orientated large grains on the grain-level heterogeneities plastic deformation of 316 LN stainless steel with mixed-grain structures.Four representative volumes elements (RVEs)of mixed-grain structures with different orientated large grains were generated by Monte-Carlo method,and periodic boundary conditions of uniaxial-tension were enforced on these RVEs.Macroscopical and microcosmic features of distribution of stress and strain for mixed-grain structure during tension process were quantitative analyzed.The results show that all the studied mixed-grain structures show evident grain-level inhomogeneous plastic deformation,and the large grains have smaller stress and strain levels in comparison with their ambient small grains.Concretely,small grains in the vicinity of large grains with hard orientation show both high stress and strain levels, in contrast,small grains in the vicinity of large grains with soft orientation show both lower stress and strain levels.
作者
李子洋
章海明
刘娟
崔振山
LI Zi-yang;ZHANG Hai-ming;LIU Juan;CUI Zhen-shan(Institute of Forming Technology & Equipment,Shanghai Jiao Tong University,Shanghai 200030,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2018年第6期208-215,共8页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(51675335
51705317)
上海市青年科技英才扬帆计划资助项目(17YF1408900)
中央高校基本科研业务费资助项目(16X100040025)
关键词
混晶组织
全场晶体塑性模拟
316LN不锈钢
不均匀塑性变形
mixed-grain structure
full-field crystal plasticity simulation
316LN stainless steel
inhomogeneous plastic deformation
作者简介
第一作者:李子洋,男,1992年生,硕士研究生,主要从事材料加工微区变形机理和热变形微观组织演变与预报研究,E-mail:lzy330@sjtu.edu.cn;通讯作者:崔振山,男,1953年生,博士,教授,主要从事材料加工中的力学问题与数值模拟研究,E-mail:cuizs@sjtu.edu.cn.
