TA15钛合金接头补焊组织特征分析  

Microstructure of repairing welded joint of TA15 Ti alloy

作　　者：杜鑫[1] 刘黎明[1] 宋刚[1] 王敏[2] 杨磊[2] 

机构地区：[1]大连理工大学三束材料表面改性国家重点实验室,辽宁大连116024 [2]沈阳飞机制造有限公司,沈阳110000

出　　处：《焊接学报》2005年第2期45-48,共4页Transactions of The China Welding Institution

摘　　要：采用光学显微镜、X射线衍射仪和电子探针等测试手段分析TA15钛合金熔焊接头补焊微观组织特征,探讨钛合金焊缝多次补焊的可行性。组织观察结果表明,钛合金接头补焊过程即是在原始焊缝基础上形成新的焊缝及热影响区的过程;补焊层焊缝与原始焊缝之间结合良好,未发现界面反应物以及气孔、裂纹、夹渣等缺陷;焊缝及母材过渡区中Ti、Al、V、Fe等元素不存在成分偏析;室温下补焊焊缝组织由α-Ti组成;随着补焊次数增加,晶粒有所粗大,出现少量锯齿状α相,补焊区显微硬度有一定降低趋势,分析结果表明TA15钛合金补焊是可行的。Microstructure characteristics of repairing welded joint of TA15 Ti alloy were analyzed by optics microscope, X-ray diffraction and electron probe microanalysis. The feasibility of Ti alloy multiple repairing welding was discussed. It was found that repairing welding was the process to form the new bead and heat-affected zone on the original bead. The interface quality of repairing welding bead and original bead is good and the defects, such as interphase reactants, air hole, crack and sediment, were not observed between the repairing welding layer and the original bead. Elements Ti, Al, V, Fe were distributed uniformly from repairing welding bead to the base metal. Repairing welded joint structure in the room temperature was α-Ti. As repairing welding times increased, crystal grain grew up and dentate ct-phase appeared. Micro-hardness in repairing welding region tended to decrease to some degree. The results showed that repairing welding of TA15 Ti alloy was feasible.

关 键 词：TA15钛合金 补焊 组织特征 氩弧焊 

分 类 号：TG403[金属学及工艺—焊接]