摘要
通过高温拉伸试验、高温持久拉伸试验以及金相分析对TC4钛合金电子束焊接接头的显微组织和高温性能进行了研究。结果表明,用电子束焊接TC4钛合金可获得高温性能良好的焊接接头,其焊接接头的高温抗拉强度为630MPa,与母材相当。高温持久拉伸时焊接接头在400℃下100h的持久强度大于600MPa,不低于TC4钛合金母材同等条件下的持久强度。TC4钛合金母材室温下的组织为典型的轧制状态组织,即拉长了的针状α+β组织,焊缝组织是由原始β相转变而成的α′相,即针状马氏体。经高温拉伸和高温持久拉伸后焊缝晶粒均明显长大,但其晶粒的长大程度与高温持续时间无关。
The microstructures and high-temperature properties of TC4 titanium alloy joints welded by the electron beam were investigated by high-temperature tensile test, high-temperature endurant tensile test and metallographic examination. The results showed that the joint of TC4 alloy with good performance at high-temperature can be obtained by means of electron beam welding. The high-temperature tensile strength of welded joint was 630 MPa, almost the same with that of the base metal. The endurant tensile strength of welded joint under 400 ℃ for 100 h was greater than 600 MPa, not less than that of the base metal. The microstructure of the weld is α′ phase (needle martensite) which is transformed from the primary β matrix. The grain size of the weld which were obtained after high-temperature tensile test and high-temperature endurant tensile test becomes larger than that of weld at room-temperature, but the growth degree of the grain was not dependent on the high-temperature duration.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2007年第10期49-52,共4页
Transactions of The China Welding Institution
关键词
TC4钛合金
电子束焊
高温拉伸
持久拉伸
TC4 titanium alloy
electron beam welding
high-temperature tensile test
endurant tensile test
