Microstructures and mechanical property of laser butt welding of titanium alloy to stainless steel
Microstructures and mechanical property of laser butt welding of titanium alloy to stainless steel
复制标题
钛合金与不锈钢激光对接焊的显微组织及力学性能
DOI：
10.1016/j.matdes.2013.07.044
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发表时间：
2014-01-01
影响因子：
8.4
通讯作者：
Zhao, Xingke
中科院分区：
文献类型：
--
作者：
Chen, Shuhai;Zhang, Mingxin;Zhao, Xingke
对钛合金与不锈钢进行激光对焊。研究了激光束偏移对接头微观结构特征和断裂行为的影响。研究发现，当激光束向不锈钢一侧偏移时，会产生更耐用的接头。金属间化合物沿界面厚度均匀，可分为两层。一种由 FeTi + α-Ti 组成，另一种由 FeTi + Fe2Ti + Ti5Fe17Cr5 组成。当激光束向钛合金一侧偏移0mm和0.3mm时，焊接后接头自发断裂。只有当激光束向钛合金方向偏移 0.6 毫米时，才能实现持久连接。从接头顶部到底部，金属间化合物厚度不断减小，界面结构依次为：FeAl+α-Ti/Fe2Ti+Ti5Fe17Cr5、FeAl+α-Ti/FeTi+Fe2Ti+Ti5Fe17Cr5、FeAl+α-Ti。当激光束偏向不锈钢时，接头的抗拉强度比偏向钛合金时更高，观察到的最高值为 150 MPa。接头的断裂沿着两个相邻金属间层之间的界面发生。 (C) 2013 Elsevier Ltd. 保留所有权利。
Laser butt welding of titanium alloy to stainless steel was performed. The effect of laser-beam offsetting on microstructural characteristics and fracture behavior of the joint was investigated. It was found that when the laser beam is offset toward the stainless steel side, it results in a more durable joint. The intermetallic compounds have a uniform thickness along the interface and can be divided into two layers. One consists of FeTi + alpha-Ti, and other consists of FeTi + Fe2Ti + Ti5Fe17Cr5. When laser beam is offset by 0 mm and 0.3 mm toward the titanium alloy side, the joints fracture spontaneously after welding. Durable joining is achieved only when the laser beam is offset by 0.6 mm toward the titanium alloy. From the top to the bottom of the joint, the thickness of intermetallic compounds continuously decreases and the following interfacial structures are found: FeAl + alpha-Ti/Fe2Ti + Ti5Fe17Cr5, FeAl + alpha-Ti/FeTi + Fe2Ti + Ti5Fe17Cr5 and FeAl + alpha-Ti, in that order. The tensile strength of the joint is higher when the laser beam is offset toward the stainless steel than toward the titanium alloy, the highest observed value being 150 MPa. The fracture of the joint occurs along the interface between two adjacent intermetallic layers. (C) 2013 Elsevier Ltd. All rights reserved.