摘要
为了改进等径角挤压法(ECAE)的不足,结合扭挤(TE)工艺的特点,提出了等径角挤扭(ECAE-T)新工艺。采用有限元模拟软件DEFORM-3D对上述三种工艺的变形特征进行模拟研究,重点分析了ECAE-T工艺对制件应变应力大小和分布的影响。模拟结果显示:与ECAE和TE相比,ECAE-T工艺存在两个大塑性变形区,能累积更大的剪切塑性变形量。采用自行设计的模具,在室温下进行了纯铝ECAE和ECAE-T实验研究,实验结果表明:模拟过程与实验基本一致,与ECAE相比,ECAE-T工艺一道次后的组织更加狭长、细小。由模拟结果和实验结果可知,ECAE-T工艺是更加优异的大塑性变形法。
In order to improve the insufficiency of ECAE,another super plastic deformation method（SPD）—TE was combined to create a new technique process—ECAE-T,which was first proposed.The finite element simulation about pure aluminum deformation during these three techniques was carried out by simulation software DEFORM-3D at room temperature.The distribution of effective strain and stress on the sample during ECAE-T were mainly obtained.The results show that there are two main deformation zone in the sample during ECAE-T and the effective strain is higher than ECAE and TE.The experiments about pure aluminum at room temperature during ECAE and ECAE-T were carried out using our own die.The results by simulation and experiments are extraordinary consistent.The optical organization after ECAE-T one pass is elongated much longer and smaller.The technique of ECAE-T is proved as a more excellent SPD method with the results of simulation and experiments.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2010年第12期1485-1489,共5页
China Mechanical Engineering
基金
国家自然科学基金资助项目(50875072)
霍英东教育基金会资助项目(121053)
安徽省优秀青年科技基金资助项目(10040606Y21)
关键词
大塑性变形
等径角挤压
等径角挤扭
有限元模拟
显微组织
severe plastic deformation
ECAE（equal channel angular extrusion）
ECAE-T（equal channel angular extrusion and twist）
finite element simulation
microstructure
