CAJ | 학술논문

研究了应变速率变化时粗晶Ti-15-3板材在β相区的超塑性.第一段的应变速率分别为1×10~(-1),和1×10~(-2) S~(-1),应变量为0.2～0.6.在第二段的应变速率为3×10~(-4)S~(-1)时.获得345%最大伸长率,比在恒应变速率下的伸长率大93%.而两段应变速率下,应变速率敏感系数m值无太大变化.研究了第一段变形结束时动态再结晶晶粒大小和后续超塑性的关系.
연구료응변속솔변화시조정Ti-15-3판재재β상구적초소성.제일단적응변속솔분별위1×10~(-1),화1×10~(-2) S~(-1),응변량위0.2～0.6.재제이단적응변속솔위3×10~(-4)S~(-1)시.획득345%최대신장솔,비재항응변속솔하적신장솔대93%.이량단응변속솔하,응변속솔민감계수m치무태대변화.연구료제일단변형결속시동태재결정정립대소화후속초소성적관계.
The superplasticity of coarse grained beta titanium alloy Ti-15-3 in beta phase area were studied by two-stage deformation method.In the first stage,the strain rates ale selected as 1×10~(-1).and 1×10~(-2) S~(-1),and the strain varies from 0.2 to 0.6.The maximum elongation reaches 345% at strain rate of 3× 10~(-4)s~(-1) in the second.exceeding 93% over that under constant strain rate.The strata rate sensitivity m obtained from the second stage defomaation is in different from the first stage deformation condition.The relationship between the recrystallized grain size at the end of the first stage and the superplasticity were investigated.