铝和不锈钢摩擦焊接界面组织与性能研究

针对6061铝合金与1Cr18Ni9Ti不锈钢异种金属焊接,采用连续旋转摩擦焊接实现铝钢异种材料焊接,并采用SEM、EDS进行组织分析和性能测试。试验结果表明:在旋转速率为600 r/min、顶锻压力为4.5 MPa,顶锻时间为2 s等工艺参数条件下,铝/钢摩擦焊接头结合紧密,界面呈现波纹状;接头抗拉强度可达252 MPa,且拉伸断裂位置发生在铝侧;铝/钢异种材料接头的结合界面两边互有元素扩散,形成厚度小于2μm的金属间化合物层;其显微硬度在界面处发生阶跃变化,且形成金属间化合物的界面处硬度最高达230 HV。

Study on interface and property of aluminum and steel friction joint

Continuous rotary friction welding was used to aluminum and steel dissimilar metal joint.Microstructure and property was analyzed by SEM and EDS.The test results show that the aluminum-steel friction welded joint is tightly bonded and the interface is corrugated under the conditions of the rotation rate of 700 r/min,the upsetting pressure of 4.5 MPa,and the upsetting time of 2 s.The tensile strength of the joint is up to 210 MP,and the tensile fracture occurs on the aluminum side.The intermetallic compound layer with a thickness of less than 2μm is formed by the diffusion of elements on both sides of the bonding interface of the aluminum steel dissimilar material joint.The microhardness changes step by step at the interface,and the hardness at the interface of forming intermetallic compounds is up to 230 HV.