Ti55钛合金双激光焊接T型接头组织与力学性能研究  

Study on Microstructure and Mechanical Properties of Ti55 Titanium Alloy Double Laser Welding T-joint

作　　者：史吉鹏 刘艳梅[1] 关峰[1] 蒋文通 张增光 SHI Jipeng;LIU Yanmei;GUAN Feng;JIANG Wentong;ZHANG Zengguang(Shenyang Aircraft Corporation,Shenyang 110850,China)

机构地区：[1]沈阳飞机工业(集团)有限公司,辽宁沈阳110850

出　　处：《热加工工艺》2024年第13期20-23,共4页Hot Working Technology

摘　　要：对1.5⊥1.5 mm的Ti55钛合金T型接头进行了双激光焊接试验,观察了接头的宏观形貌,分析了接头不同区域的组织结构,以及接头的高温拉伸性能和常温剪切性能。结果表明:Ti55钛合金T型接头焊缝表面成形较好,横截面没有焊接缺陷。从接头母材区域到熔合区,接头的晶粒尺寸逐渐增大,β相含量逐渐减少,α与α'相含量逐渐增多。随着拉伸温度的升高,T型接头的抗拉强度逐渐降低,而伸长率逐渐升高。接头去除立筋后的剪切性能比母材高3.3%。The double laser welding test was carried out for the 1.5⊥1.5 mm T-joint of Ti55 titanium alloy.The macroscopic morphology of the joint was observed,the microstructure of different regions of the joint and the high-temperature tensile properties and room-temperature shear properties of the joint were analyzed.The results show that the weld surface forming of the Ti55 titanium alloy T-joint is good and there is no welding defect in the cross section.From the base metal region of the joint to the fusion zone,the grain size of the joint gradually increases,the content ofβphase gradually decreases,and the content ofαandα'phases gradually increases.With the increase of the tensile temperature,the tensile strength of the T-joint gradually decreases,while the elongation increases gradually.The shear performance of the joint after removing the rib is 3.3%higher than that of the base metal.

关 键 词：Ti55钛合金 T型接头 激光焊接 微观组织 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接]