大型稀土镁合金工件变形均匀性研究  

Study on the deform uniformity of large-sized work pieces of RE Mg alloy

作　　者：赵伟[1] 张治民[1] 于建民[1] 梁丽 

机构地区：[1]中北大学材料科学与工程学院,山西太原030051 [2]晋西机器工业集团有限责任公司,山西太原030051

出　　处：《轻合金加工技术》2017年第1期40-45,50,共7页Light Alloy Fabrication Technology

基　　金：山西省自然科学基金(2009011028-1);山西省青年基金(2008021030)

摘　　要：针对传统多道次镦挤成形过程中工件整体变形均匀性较差的缺陷,提出了两种改进方案,用有限元模拟软件对三种不同的方案进行模拟对比分析,确定最佳方案,进行试验验证。结果表明,与传统方法相比,应用优化后的方案累积应变提高了35.7%;不均匀参数C降低到0.209,工件的应变梯度显著降低,工件整体变形均匀性得到了改善;对微观组织进行分析,经二道次镦挤后的样品晶粒得到明显的细化。Two improved solutions were proposed to deal with the less uniformity of work pieces in traditional multi-pass upsetting-extrusion. Then the best solution was determined through comparison and analysis with finite element simulation, and it was verified by experi- ments. The results indicate that after optimization, the accumulative strain increases by 35.7% ; uneven parameter C decreases to 0. 209,and the strain gradient of work pieces sig- nificantly reduces, and the deform uniformity gets better. The grain size after second-pass up- setting-extrusion is much more refined via microstructure analysis.

关 键 词：稀土镁合金 累积应变 均匀性 大塑性变形 

分 类 号：TG146.22[一般工业技术—材料科学与工程]