镁合金等径角挤压过程有限元模拟  

Finite element simulation of equal channel angular extrusion process of Mg alloy

作　　者：王力杰[1] 孙远[2] 张建军[3] 刘子瑜[1] 王凡[1] 

机构地区：[1]中国兵器科学研究院宁波分院,内蒙古包头014034 [2]包头职业技术学院,内蒙古包头014030 [3]西安交通大学,陕西西安710049

出　　处：《兵器材料科学与工程》2008年第5期65-69,共5页Ordnance Material Science and Engineering

摘　　要：通过等径角挤压可以细化镁合金晶粒。利用非线性有限元软件MSC.Marc对镁合金的ECAE变形过程进行有限元模拟,获得等效应变和等效应力分布规律,分析挤压力随变形时间的变化和摩擦对ECAE变形的影响。结果表明:挤压力-变形时间曲线可以分为快速增加阶段,慢速增加阶段和稳定阶段;等效应力分布很不均匀,模具拐角对应的区域等效应力最大;试样中部的等效应变值,大于顶部和底部;摩擦会导致变形不均匀。Equal Channel Angular Extrusion （ECAE） is a method to fabricate grain refinement of magnesium alloy. In this paper, non-linear finite clement software MSC.Marc was employed to simulate ECAE process. The distribution of equal effective strain and equal effective stress was obtained through finite element simulation. And the changing of pressing load versus time and the influence of friction on the ECAE deformation process were analyzed. The results indicated that the curve of extrusion force versus time was divided into three stages：rapid increased stage, slow increased stage and steady stage. The distribution of equal effective stress was inhomogeneous, the biggest was in the comer of die. The equal effective stain value in the middle part of billet was bigger than that in top and bottom part. Friction resulted in inhornogeneous of deformation.

关 键 词：等径角挤压 有限元模拟 镁合金 

分 类 号：TG376[金属学及工艺—金属压力加工]