摘要
针对7075铝合金板搅拌摩擦焊对接接头组织变化过程及搅拌头下压深度对焊接过程中焊缝塑性金属流动行为进行研究。研究结果表明:焊核区金属发生了动态再结晶,由细小的等轴晶组成;热机影响区晶粒出现弯曲变形,并发生了动态回复与部分再结晶;热影响区晶粒没有发生明显长大,晶粒间界随着热输入增大而加宽。搅拌摩擦焊接过程中,焊缝塑化金属存在三种运动,表层的水平圆周运动,探针周围的无序运动,底层的向上运动。
The investigation was conducted on the structure evolution of the welding joint of 7075 aluminum alloy sheets and the behavior of plastic metal flow of the seam in the process of friction stir welding( FSW) with different pressure depths of the stirring head.The results show that the metal in the weld core has undergone dynamic recrystallization and is composed of fine isometric crystals. The grain in the thermo-mechanically affected zone( TMAZ) is bent and deformed,and dynamic recovery occurs and some are recrystallized.The grain size in the heat affected zone( HAZ) does not grow significantly and the grain boundary widens with the increase of heat input. In FSW process,there are 3 kinds of motions of the plasticized metal in the weld seam: horizontal circular motion of the surface layer,disordered motion around the probe,and upward movement of the bottom layer.
作者
姜泽东
JIANG Ze-dong(Changzhou Vocational Institute of Engineering, Changzhou 213164,China)
出处
《轻合金加工技术》
CAS
北大核心
2019年第10期36-39,共4页
Light Alloy Fabrication Technology
基金
江苏高校品牌专业建设工程资助项目(TAPP)(PPZY2015C235)
关键词
7075铝合金板
搅拌摩擦焊
组织演变
塑性流动
7075 aluminum alloy sheet
friction stir welding
structure evolution
plastic flow
