摘要
对6005A-T6铝合金FSW接头、母材以及MIG焊接头进行了疲劳性能试验对比研究。结果表明,FSW接头的抗拉强度约是母材抗拉强度的82.5%;MIG焊试样的抗拉强度约是母材抗拉强度的73.4%。当循环周次N>107时,FSW试样的疲劳强度值接近于母材,约为母材疲劳强度值的93%,而MIG焊试样的疲劳强度值仅为母材的67%。FSW接头热影响区的断口疲劳区形貌为准解理和韧窝的组合形貌。准解理型穿晶扩展裂纹与FSW接头热影响区中原母材枝晶结构有关,断口扩展区形貌为韧窝状形貌。
Comparing experiments are made among 6005A-T6 Al-alloy FSW joint, base metal and MIG welding joint. The results show that the tensile strength of FSW joint is 82.5 % of that of the base metal, and the tensile strength of MIG joint is 73.4 % of that of the base metal. When the circulatingtime N is larger than 10^7 , the fatigue strength of the FSW joint approaches to that of the base metal, and is about 93% of the that of base metal but the fatigue strength of the MIG joint is 67% of that of the base metal. The shape of the fracture fatigue area of FSW joint heat affected zone is the combination of quasi-cleavage and cavity. The quasi-cleavage running crystal crack is related to the crystal structure of the original base metal. The shape of the fracture extend zone is cavity.
出处
《长春工业大学学报》
CAS
2009年第1期12-17,共6页
Journal of Changchun University of Technology
关键词
铝合金
搅拌摩擦焊
疲劳
aluminum alloy friction stir welding fatigue.
