薄片状TiNi合金/不锈钢激光微焊接接头组织特征  

Microstructure Characteristics of Laser Micro Welding Joint between TiNi Shape Memory Alloy Sheet and Stainless Steel Sheet

作　　者：陈玉华[1,2] 龚伟怀[2] 倪泉[2] 柯黎明[2] 

机构地区：[1]哈尔滨工业大学先进焊接与连接国家重点实验室,黑龙江哈尔滨150001 [2]南昌航空大学,江西南昌330063

出　　处：《稀有金属材料与工程》2011年第11期2026-2029,共4页Rare Metal Materials and Engineering

基　　金：现代焊接生产技术国家重点实验室开放课题(200803);江西省自然科学基金项目(2007GQC1513)

摘　　要：采用微型脉冲激光对0.2mm厚的薄片状TiNi形状记忆合金/不锈钢异种材料进行对接焊,研究了接头的微观组织特征。结果表明,以纯Ni丝为填充材料、以微型脉冲激光为热源可以实现TiNi合金/不锈钢异种材料的良好焊接。焊缝中心区为细小的等轴晶组织,主要元素为Ti、Ni、Fe。Ti元素的含量和不锈钢母材基本接近,Ni元素的含量略高于TiNi合金母材,远高于不锈钢母材,但TiNi合金母材一侧基本没有Fe元素。TiNi合金母材与焊缝之间存在明显的界面区,宽度为10～20μm,界面区有从不锈钢母材扩散而来的Fe、Cr元素。不锈钢母材与焊缝之间界面区的宽度较小,表现为界面线。Dissimilar materials of TiNi shape memory alloy（SMA） and stainless steel of 0.2 mm thickness were butt welded by micro impulse laser and the microstructure characteristics of the weld joint were studied.The results show that good joining between TiNi SMA and stainless steel can be realized with pure Ni wire as filler material and micro impulse laser as welding heat source.The microstructures of weld center are fine equiaxed crystals and the main elements in weld seam are Ti,Ni and Fe.In weld seam,the content of Ti is similar to that of stainless steel base metal,while Ni is a little more than that of TiNi SMA base metal and much more than that of stainless steel base metal.There is little Fe element in TiNi SMA base metal.There is an obvious interfacial zone of about 10-20 μm width between TiNi SMA base metal and the weld,and there are Fe and Cr elements in the interfacial zone,which diffuse from stainless steel base metal.The width of the interfacial zone between stainless steel base metal and the weld is small and the interface is a line.

关 键 词：TiNi合金/不锈钢异种材料 微激光焊接 微观组织 元素分布 

分 类 号：TG139.6[一般工业技术—材料科学与工程]