摘要
对4mm厚6061-T6铝合金进行了搅拌摩擦焊焊接,采用组织观察,拉伸试验和静态腐蚀失重试验对搅拌摩擦焊接头的显微组织和力学性能及腐蚀性能进行了研究。结果表明:接头焊核区发生了动态再结晶,形成了细小的等轴晶,热机影响区晶粒发生了较大程度的变形,热影响区晶粒发生了粗化;焊接速度为160mm·min-1时,接头的抗拉强度达到215MPa,为母材的76%,接头的断裂形式为韧性断裂;接头显微硬度分布曲线呈W形,沿焊缝中心线基本对称,前进边热影响区硬度低于母材的,是接头的薄弱环节;焊接速度为160mm·min-1时,焊缝的耐蚀性比母材的好。
Aluminum alloy 6061-T6 in thickness of 4 mm was welded by friction stir welding （FSW）. The microstructure, mechanical property and corrosion property of FSW joint were investigated by optical microscopy, tensile test and static weight loss experiment. The results demonstrate that the weld nugget zone （WNZ） was characterized by the dynamic recrystallization, which consisted of refined equiaxed grains. The grains in thermomechanically affected zone （TMAZ） highly deformed and those in heat-affected zone （HAZ） coarsened. When the welding rate was 160 mm· min^-1 , the peak tensile strength of the joint reached 215 MPa as much as 76% of the base metal, and the joint fractured as a mode of ductile fracture. Micro-hardness of the joint distributed as W shape and was symmetrically along the welding line. The micro-hardness of the HAZ on advancing side was lower than that of the base metal, where should be the weak zone of the welded joint. The corrosion property of the weld was better than that of the base metal at a welding rate of 160 mm · min^-1.
出处
《机械工程材料》
CAS
CSCD
北大核心
2014年第8期93-96,100,共5页
Materials For Mechanical Engineering
基金
河南省教育厅科学技术研究重点项目(14A460022)
安阳市重大科技计划项目(2013A015)
安阳工学院青年科研基金资助项目(AGQK2013001)
