ECAP过程中载荷变化规律的有限元模拟  

The FEM numerical simulation of loadings in ECAP

作　　者：崔少贤[1] 唐文亭[1] 张忠明[1] 袁森[1] 

机构地区：[1]西安理工大学材料科学与工程学院,陕西西安710048

出　　处：《兵器材料科学与工程》2006年第2期39-41,共3页Ordnance Material Science and Engineering

基　　金：教育部回国留学人员启动基金;陕西省教育厅专项科研计划项目(03JK132)

摘　　要：等通道转角挤压(ECAP)是一种制备超细晶粒材料的新技术。为了掌握AZ31镁合金在ECAP过程中的力学变化规律,利用刚塑性有限元技术对AZ31镁合金的等通道转角挤压过程进行了数值模拟,分析了载荷在挤压过程中的变化规律及产生变化的原因。结果表明:AZ31镁合金的ECAP过程大致分为载荷快速增加,载荷缓慢增加,载荷基本稳定三个阶段;载荷峰值随摩擦因数的增大迅速增大,应采取有效的润滑措施减小摩擦从而降低载荷峰值,提高冲头的抗失稳能力;随着摩擦因数的增大,载荷在达到峰值后下降趋势越来越明显。Equal Channel Angular Pressing（ECAP）is an advanced technology for preparation of ultra-fine grain materials. In order to master the variation regularity of mechanics in the ECAP process, in this paper, the rigid-plastic FEM has been used in the numerical simulation of ECAP of magnesium alloy AZ31. The loadings variation and the reasons were analyzed. The following conclusions were reached that ECAP of magnesium alloy AZ31 can be classified into three phases in the process： the loadings increase fast, the loadings increase steadily, the loadings remain stable ; peak value of loadings will increase swiftly with the friction coefficient increasing, a effective lubricating measure should be adopted to reduce the peak value and improve the ability of resisting destabilization of punch; along with friction coefficient increasing the loading will decline distinctly when it reach the peak value.

关 键 词：等通道转角挤压(ECAP) 数值模拟 载荷一行程曲线 镁合金AZ31 

分 类 号：TG376[金属学及工艺—金属压力加工]