摘要
采用光学显微镜和MTS810拉伸试验机等分析了不同工艺淬火后TC4钛合金激光焊接接头的超塑性变形行为和显微组织,研究了淬火对TC4钛合金激光焊接接头超塑性变形的影响。结果表明:淬火能够提高激光焊接接头的超塑性变形均匀性,且随着淬火温度的升高,激光焊接头超塑性变形均匀性提高;采用接头超塑性变形后焊缝与母材的截面收缩率之比K来表征接头变形后的均匀性,当淬火温度为1000℃,在变形温度940℃及应变速率10^(-4)s^(-1)下进行超塑性变形时,接头变形均匀性达到最大,此时K=0.9。
Superplastic deformation behavior and microstructure of laser welded joint of TC4 titanium alloy after different quenching processes were studied by means of OM and MTS810 tensile testing machine,and the effect of quenching on superplastic deformation behavior of the joint was analyzed.The results show that the quenching can improve the superplastic deformation uniformity of the laser welded joint,and the deformation uniformity becomes better with the increasing of the quenching temperature.K（ the ratio of the shrinkage ratio of the weld to the base metal） is used to characterize the uniformity of the joint after superplastic deformation,and the K reaches the maximal value of 0.9 at the quenching temperature of 1000 ℃,deformation temperature of 940 ℃ and strain rate of 10^（-4）s^（-1）.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2017年第9期71-75,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51465042)
关键词
激光焊
淬火处理
超塑性
均匀性
laser welding
quenching treatment
superplasticity
uniformity
