挤扭过程中应变量对纯铜组织性能影响  

Influence of the effective strain on microstructure and property of pure copper in the twist extrusion

作　　者：李萍[1] 王成[1] 薛克敏[1] 王晓溪[1] 张翔[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009

出　　处：《塑性工程学报》2011年第3期30-34,共5页Journal of Plasticity 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)

摘　　要：运用有限元模拟软件MSC.Marc对纯铜挤扭工艺进行研究,分析挤扭变形过程、应变分布以及挤压道次对应变分布的影响。结果显示,变形可分为变形开始、完全充满、逐步挤出3个阶段。1道次成形后试样中心应变量较小,边缘处相对较大;随着挤压道次的增加,试样中心、边缘应变量均显著增大。采用自行设计的挤扭模具,在室温下进行纯铜的多道次挤扭试验。试验结果表明,应变量较大的边缘处晶粒变形较为剧烈,硬度值也相对较高;挤压道次增加,应变量增大,晶粒变形剧烈,硬度值愈高。The finite element simulation on pure copper deformation during twist extrusion（TE）was carried out by simulation software MSC.Marc.The procedure steps of TE,the distribution of effective strain and the change of strain component were analyzed.The results show that TE deformation could be divided into three steps.After one TE pass,the value of the effective strain in the edge area would be much larger than the center area.After more TE passes,the value of effective strain of both center area and edge area increase significantly.The experiment on pure copper at room temperature during TE was carried out using self-designed die.The results show that the crystals suffered greater deformation and the microhardness getting higher in the area where effective strain is larger.After more TE passes,the value of effective strain became larger,the crystals suffered greater deformation,and the microhardness increase s significantly.

关 键 词：大塑性变形 挤扭 数值模拟 等效应变 显微组织 显微硬度 

分 类 号：TG376[金属学及工艺—金属压力加工]