纯铝粉末烧结体锥形件高压扭转有限元模拟及实验  

Finite Element Method and Experiments on High-pressure Torsion of Cone-shaped Part Prepared by Pure Al Powder Sintered Material

作　　者：李琦[1] 李萍[1] 薛克敏[1] 王晓溪[1] 贾建磊[1] 

机构地区：[1]合肥工业大学,合肥230009

出　　处：《中国机械工程》2010年第11期1370-1373,1385,共5页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(50875042);安徽省2008科技攻关计划面上项目(08010202132);安徽省优秀青年科技基金资助项目

摘　　要：采用有限元法对锥形件高压扭转成形过程进行了数值模拟,着重分析了成形过程的应变和相对密度的分布及变化趋势。通过实验对纯铝粉末烧结体试样变形前后相同部位的金相组织、显微硬度和相对密度进行了对比分析。研究结果表明:高压扭转工艺对试样有着显著的致密效果,模拟中试样的相对密度超过0.996,实验中试样的密度达0.980;试样不同部位的等效应变和显微硬度不同,边缘处的等效应变最大,达到4.55,该处的显微维氏硬度值也最高,达61.12HV0.1/10。Cone-shaped part prepared by pure Al powder sintered material processed by HPT was studied by compressible rigid plastic FEM, the distribution and the variational trend of strain and density in HPT process were analyzed; The specimen was deformed by HPT equipment and die, microstructure, microhardness and density of different points in undeformed and deformed specimens had been examined. The results show that HPT process is a useful tool for reducing the porosity in specimen, the relative density of specimen is above 0. 996 in FEM, while it reaches to 0.98 in the experiment; the strain-effective of different points in specimen are different, it reaches to the highest in the edge of specimen, about 4.5, microhardness reaches to 61.12HV0.1/10 in the edge of specimen, it is also the highest.

关 键 词：金属材料 纯铝粉末 高压扭转 锥形件 有限元模拟 显微组织 

分 类 号：TG376[金属学及工艺—金属压力加工]