冷拉拔钢丝横截面应变不均匀性的晶体塑性研究  

Crystal Plasticity Study on the Non-uniformity of Strain on the Cross-section of Cold Drawn Steel Wire

作　　者：赵勇 刘腾远[1,2] 贾春妮 杨朕聃 陈响军 王培 李殿中[1,2] ZHAO Yong;LIU Tengyuan;JIA Chunni;YANG Zhendan;CHEN Xiangjun;WANG Pei;LI Dianzhong(Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China)

机构地区：[1]中国科学院金属研究所沈阳材料科学国家研究中心,沈阳110016 [2]中国科学技术大学材料科学与工程学院,沈阳110016

出　　处：《材料研究学报》2024年第2期81-91,共11页Chinese Journal of Materials Research

基　　金：国家自然科学基金(52031013)。

摘　　要：建立钢丝多道次拉拔宏观有限元和珠光体团等效晶体塑性有限元相耦合的多尺度模型,研究了冷拉拔钢丝横截面的应变分布、应变路径的演化规律和应变量及应变路径对材料强化效应的影响。结果表明,钢丝冷拉拔后其横截面上的塑性应变量呈现出从心部到表面先升高后降低的分布特征,钢丝心部区域的应变路径接近等比例加载,而靠近表面区域的应变路径则比较曲折。曲折多变的应变路径使更多的滑移系开动,从而产生额外的强化最终使材料的硬度提高。横截面不同位置的应变量和应变路径差异的综合作用,使冷拔钢丝横截面上次表层的硬度最高。A macroscopic finite element model of multi-pass cold drawing coupled with a microscopic crystal plasticity finite element model of pearlite has been established in this study.The strain distribution and strain path of the cold drawn steel wire have been simulated,and the influence of them on the material strengthening have been analyzed.It is found that the plastic strain on the cross-section of the steel wire increases first and then decreases from the core to the surface after cold drawing.Meanwhile,the strain path in the core area of the steel wire is close to proportional loading,while the strain path near the surface is tortuous.The tortuous strain path can drive more slip systems to act,causing additional strengthening and ultimately increasing hardness.Under the comprehensive effect of the difference of strain and strain path in different areas of the cross-section,the subsurface hardness of the cold-drawn steel wire is the highest.

关 键 词：材料合成与加工工艺 应变不均匀性 晶体塑性有限元 冷拉拔钢丝 应变路径 

分 类 号：TG356.46[金属学及工艺—金属压力加工]