5052-H34铝合金FSW接头疲劳特性  

Fatigue Property of FSW Welded Joint of 5052-H34 Aluminum Alloy

作　　者：王鹏飞[1] 李春风[2] 

机构地区：[1]西京学院机械工程学院,陕西西安710123 [2]承德石油高等专科学校工业中心,河北承德067000

出　　处：《热加工工艺》2016年第11期209-211,共3页Hot Working Technology

基　　金：陕西省教育厅专项科研计划项目(15JK2172)

摘　　要：研究了5052-H34铝合金搅拌摩擦焊缝的疲劳裂纹萌发及扩展机制。采用光学显微镜和扫描电镜分析焊缝材料的显微组织,使用疲劳拉伸方法测试焊缝试样的力学性能。结果表明,经疲劳拉伸试验,母材和热影响区裂缝周围出现滑移带,而搅拌区的裂缝附近滑移带却不明显。母材的疲劳裂缝传播速度比搅拌区快,但比热影响区传播的慢,测得焊缝的疲劳寿命达到了母材的80.3%。The fatigue crack germination and extension mechanism of 5052-H34 aluminum alloy FSW welded joint were researched. The microstructure of FSW welded joint was analyzed by optical microscope and the fatigue crack was investigated by scanning electron microscope. An experimental set-up was designed for investigating the mechanical properties by static stretching and fatigue stretching. The results show that, after fatigue tensile, there are some slip bands around the cracks in the base metal and heat affected zone, but there is none around the cracks in the stirring zone. The fatigue crack propagation rate of the base metal is higher than that of stirring zone, but lower than that of heat affected zone. The measured fatigue life of the weld reaches to 80.3% of the base metal.

关 键 词：疲劳裂缝 疲劳拉伸 滑移带 

分 类 号：TG453.9[金属学及工艺—焊接] TG405