摘要
采用惯性摩擦焊技术进行2219铝合金与1Cr18Ni9Ti不锈钢回转体的连接,借助扫描电镜、能谱分析仪对焊后接头进行组织与缺陷分析。结果表明,铝合金侧形成平行于焊缝界面的片层状组织,包括动态再结晶形成的等轴细晶区和沿摩擦剪切方向拉长的变形晶区。铝合金侧靠近外边缘处存在孔洞缺陷,Cu,O元素在孔洞周围发生偏聚,生成的脆性金属间化合物和氧化物会造成应力集中,阻碍金属塑性流动,降低接头性能。界面处形成了厚度约2μm的金属间化合物层。
The joint of 2219 aluminum alloy and 1 Cr18 Ni9 Ti rotary body was connected by inertial friction welding technology. The microstructure and defects of the welded joint were analyzed by SEM and EDS. The results showed that the lamellar microstructure parallel to the weld interface formed on the side of the aluminum alloy, including equiaxed fine grain area formed by dynamic recrystallization and deformable grain area elongated along the direction of frictional shear. There were holes near the outer edge of the aluminum alloy side, Cu and O elements segregated around the holes. Brittle intermetallic compounds and oxides would cause stress concentration, hinder metal plastic flow and reduce joint performance. An intermetallic compound layer about 2 μm thick formed at the interface.
作者
刘招
兰玲
王廷
张轲
蒋思远
Liu Zhao;Lan Ling;Wang Ting;Zhang Ke;Jiang Siyuan(Shanghai Key Laboratory of Materials Laser Processing and Modification,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Shipbuilding Technology Research Institute,Shanghai 200032,China;Shandong Provincial Key Laboratory of Special Welding Technology,Harbin Institute of Technology at Weihai,Weihai 264209,Shandong,China)
出处
《焊接》
北大核心
2021年第9期1-4,61,共5页
Welding & Joining
基金
国家自然科学基金资助项目(51875354)。
