基于三维镦拔工艺的TC4合金细晶超塑性  

Fine-crystal Superplasticity of TC4 Alloy Based on Three Dimensional Upsetting and Cogging

作　　者：梁军辉[1] 王高潮[1] 马超[1] 张杰刚[2] 

机构地区：[1]南昌航空大学航空制造工程学院,江西南昌330063 [2]首都航天机械公司,北京100076

出　　处：《热加工工艺》2012年第23期1-4,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(AA201003191)

摘　　要：钛合金的晶粒尺寸对其超塑性能有着显著影响。采用三维镦拔形变热处理工艺对供货态的TC4合金进行细晶化处理,然后采用恒应变速率法对细晶TC4合金的超塑性进行了研究。结果表明:采用三维镦拔工艺能简单、有效地细化TC4合金的原始组织,平均晶粒尺寸由原始组织的50μm细化至15μm。在变形温度800～950℃,应变速率为2.2×10-4s-1的试验条件下,处理后的TC4合金均表现出良好的超塑性能,最大伸长率达到747%。Titanium alloy＇s superplasticity is influenced obviously by the dimensions of grains. Adopting ausforming with the three-dimensional upsetting and cogging, the grains of commercial TC4 titanium alloy were refined. Then using a constant strain rate, fine crystalline superplastic TC4 alloy was studied. The results show that, the ausforming with three-dimensional upsetting and cogging process can refine original grains of TC4 alloy simply and effectively; original average grain size is refined from 50μm to 15 μm. At the temperature 850-930℃ and strain rate 2.2×10-4 s-1, TC4 alloy after ausforming show a good superplasticity and the best elongation can arrive at 747%.

关 键 词：三维镦拔工艺 TC4合金 细化晶粒 超塑性 

分 类 号：TG113.253[金属学及工艺—物理冶金]