TC17钛合金嵌入式线性摩擦焊接头组织与性能  

Structure and mechanical property of wedge linear friction welding joint of TC17 titanium alloy

作　　者：金俊龙 陶军 季亚娟 张传臣 JIN Junlong;TAO Jun;JI Yajuan;ZHANG Chuanchen(Aeronautical Key Laboratory for Welding and Joining Technologies,AVIC Manufacturing Technology Institute,Beijing,100024,China)

机构地区：[1]中国航空制造技术研究院,航空焊接与连接技术航空科技重点实验室,北京100024

出　　处：《焊接学报》2021年第5期18-22,I0002,I0003,共7页Transactions of The China Welding Institution

基　　金：国家科技重大专项资助项目(2017-Ⅶ-0005-0098);航空科学基金资助项目(201911025003).

摘　　要：针对航空长形整体构件锻造与加工的难题,提出采用嵌入式线性摩擦焊方法进行分段组合制造,采用嵌入式线性摩擦焊技术开展了TC17钛合金试验件的焊接,针对所形成的V形接头,分析了接头塑性流动规律与接头形成机理、组织特征与力学性能.结果表明,焊接过程中,金属流动规律与普通线性摩擦焊接头有显著区别,高温塑性金属随着楔块的移动逐渐往底部尖端流动聚集,导致尖端焊缝较宽,上部较窄,顶锻侧试件热力影响区金属变形量大于振动侧,接头内楔块尖端热力影响区较宽,其范围内存在一个热影响区域,接头拉伸强度与疲劳强度均与母材等强,试样均断于母材区域.In order to solve the difficulty of forging and processing of aviation long-shaped integral parts,the method of wedge linear friction welding is proposed for piecewise combined fabrication,TC17 titanium alloy specimens were welded by wedge linear friction welding,according to the V shaped joints,the forming mechanism,microstructure and mechanical properties of the joints were analyzed.Results showed that the metal flow law in the welding process is significantly different from the common linear friction welding joint.the high temperature plastic metal gradually flows to the bottom tip with the wedge moving,resulting in a wider tip weld and a narrower upper part,the amount of the metal deformation in the thermal mechanical affected zone(TMAZ)of the forging side is greater than that in the vibration side.There is a wide TMAZ at the tip of the wedge in the joint,there is a heat affected area in this range,the tensile strength and the high cycle fatigue strength of the joints are equal to that of the base metal,and the specimens are all broken at the base metal area.

关 键 词：钛合金 长形构件 拼接 线性摩擦焊 组织 力学性能 

分 类 号：TG453[金属学及工艺—焊接]