摘要
以厚度为60 mm的6061铝合金板材为研究对象,采用Deform仿真分析技术研究了不同压下率轧制变形过程中板材温度、应变、应力场的变化规律,着重分析了对板材心部、1/4处、表层的影响,并结合粘塑性自洽(VPSC)有限元法研究了板材不同位置处的织构演变规律,为铝合金轧制过程中的变形行为和各向异性研究提供了新的方法。结果表明:多道次轧制过程中,心部与表层区域的最大温差受轧件压下率影响不大,最大温差为10℃,板材表层和1/4处的累积应变均始终大于心部,轧件与轧辊接触导致表层承受较大的应力,轧件局部表现出明显的应力分布不均匀的状态;轧件表层、1/4处以及心部均形成了β取向线上的3种典型织构,即Copper织构{112}<11-1>、Brass织构{011}<21-1>和S织构{123}<63-4>,随着轧制压下率的不断增大,织构的体积分数越来越大,织构强度也逐渐增大,其中,S织构的体积分数和强度上升趋势明显,进一步说明S织构相比其他两种织构对应变变化过程更加敏感。
For the 6061 aluminum alloy plate with the thickness of 60 mm,the change laws of temperature,strain and stress fields of the plate during the rolling deformation process at different reduction rates were studied by Deform simulation analysis technology,and the influences on the core,1/4 position and the surface of the plate were emphatically analyzed.Then,the texture evolution laws of different positions of the plate were studied by visco-plastic self-consistent(VPSC)finite element method,which provided a new method for the study of deformation behavior and anisotropy in the aluminum alloy rolling process.The results show that during the multi-pass rolling process,the maximum temperature difference between the core and surface area is not prominently affected by the reduction rate of the rolled part,and the maximum temperature difference is 10℃.The accumulative strains at the surface and 1/4 position are always greater than that at the core,the contact between rolled parts and roller causes a large stress on the surface,and it shows obvious uneven stress distribution in the local areas of rolled parts.Three typical textures onβorientation line,that are Copper texture{112}<11-1>,Brass texture{011}<21-1>and S texture{123}<63-4>are formed at the surface,1/4 position and core of rolled part.With the continuous increasing of rolling reduction rate,the volume fraction of texture increases and the texture strength also increases.Among them,the volume fraction and the strength of S texture show an obvious increasing trend,which further indicates that the strength of S texture is more sensitive to the strain change process than the other two textures.
作者
蒋小娟
胡蒙均
孙涛
肖欣睿
彭洁
董梦瑶
詹正阳
Jiang Xiaojuan;Hu Mengjun;Sun Tao;Xiao Xinrui;Peng Jie;Dong Mengyao;Zhan Zhengyang(School of Mechanical Engineering and Automation,Chongqing Industry Polytechnic College,Chongqing 401120,China;School of Materials Science and Engineering,Chongqing University,Chongqing 400044,China)
出处
《锻压技术》
CAS
CSCD
北大核心
2023年第8期125-135,共11页
Forging & Stamping Technology
基金
重庆市教育委员会科学技术研究计划青年项目资助项目(KJQN202203209,KJQN202203216)
重庆市自然科学基金面上项目(cstc2021jcyj-msxmX1112)。
关键词
6061铝合金
热轧
粘塑性自洽模型
各向异性
压下率
6061 aluminum alloy
hot rolling
visco-plastic self-consistent model
anisotropic
reduction rates
