异步冷轧少晶铜薄带局部变形的CP-FE模拟  

CP-FE Modelling of Localized Plastic Deformation in the Asynchronous Cold Rolling of a Copper Oligocrystal

作　　者：陈守东 卢日环[4] 孙建 李杰 CHEN Shoudong;LU Rihuan;SUN Jian;LI Jie(School of Mechanical Engineering,Tongling University,Tongling 244061,Anhui,China;State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China;Key Laboratory of Construction Hydraulic Robots of Anhui Higher Education Institutes,Tongling University,Tongling 244061,Anhui,China;National Engineering Research Center for Equipment and Technology of Cold Rolled Strip,Yanshan University,Qinhuangdao 066004,Hebei,China)

机构地区：[1]铜陵学院机械工程学院,安徽铜陵244061 [2]东北大学轧制技术及连轧自动化国家重点实验室,沈阳110819 [3]铜陵学院工程液压机器人安徽普通高校重点实验室,安徽铜陵244061 [4]燕山大学国家冷轧板带装备及工艺工程技术研究中心,河北秦皇岛066004

出　　处：《材料导报》2023年第14期214-223,共10页Materials Reports

基　　金：国家自然科学基金(51804219,52005432,52204401);安徽省自然科学基金(1808085QE161);安徽省重点研究与开发计划项目(202004a05020011);安徽省高校优秀青年人才支持计划项目(gxyq2022093);安徽省高校优秀青年科研项目(2022AH030153);铜陵学院重点培育项目(2020tlxyxs33)。

摘　　要：采用具有拉拔-压缩-剪切功能的微型异步轧机,开展少晶铜薄带轧制试验。基于晶体塑性理论,建立复合成形条件下少晶铜薄带轧制变形的晶体塑性有限元模型(CPFEM),分析晶粒间相互作用对晶间-晶内局部变形和滑移的影响。采用考虑晶粒尺寸、形貌和织构的晶粒组织生成算法和取向赋予算法,建立薄带厚度方向上分布1—5层晶粒和特定织构的轧制模型。模拟得到的轧制力结果与试验测得的结果吻合较好,验证了模型的准确性。模拟结果表明,晶体塑性有限元模型可以定量预测复合成形轧制变形时晶粒尺度的滑移系启停、滑移局部化以及晶粒间的滑移对比。厚度方向只分布1层或2层晶粒的轧制模型,滑移表现出显著的各向异性及局部化,形成与轧制方向呈45°的集中滑移和晶界-晶内的局部滑移,且对晶粒结构和取向依赖性强;厚度方向分布4层或5层晶粒时,则出现完全不同的滑移趋势。该模型可以准确获取晶粒尺寸和厚度相近时少晶组织滑移变形及其演化的机制。Amicro-asynchronous mill with tension-compression-shear function was used to carry out the rolling experiment of thin strip with oligocrystal copper.Based on the theory of crystal plasticity,a crystal plastic finite element model(CPFEM)was established for the rolling deformation of thin strip of oligocrystal copper under composite forming conditions.Five orientation sets for each model and 1 to 5 grains in the thickness direction were incorporated into an oligocrystal microstructure generated by grain growth and texture distribution model.The accuracy of the developed CPFEM model is verified by the fact that the simulated roll force agree well with the experimental results.Results show that the CPFE model can quantitatively predict the slip activation,slip localization and grain-by-grain comparison of slip under compound rolling.In the thin oligocrystal with 1or 2 grains in the thickness direction,the slip is markedly heterogeneous and localization depending on grain morphology and crystallographic orientation,formation intense slip bands running at 45°with respect to the rolling direction and located along grain boundary and intra-grain.However,opposite grain orientation and morphology effects in the thick oligocrystal with 4 or 5 grains in the thickness direction.This model can accurately determine the mechanism of slip deformation and evolution of oligocrystal structures with similar grain size and thickness.

关 键 词：复合成形轧制 少晶 晶间作用 晶体塑性 有限元分析 

分 类 号：TG335.5[金属学及工艺—金属压力加工]