Influence Of Electromagnetic Field On The Microstructures And Mechanical Properties Of Friction Welding Joint Of Dissimilar Metals

By the means of experimental researches and theoretical analyses, the friction welding processes of different dissimilar materials under external electromagnetic field are studied. The influence of electromagnetic field on the microstructures of the weld zone, diffusion behavior of main alloying elements and mechanical properties at room temperature of friction welding joints between different dissimilar materials are discussed primarily.The influence of traditional friction welding parameters and post weld heat treatment parameters on the microstructure and mechanical properties at room temperature of the friction welding joint between TC4 alloy and L5 pure aluminum are studied firstly. As a result, there are good friction weldability between TC4 titanium alloy and L5 pure aluminum and no intermetallic phases in the friction weld zone. In addition, tensile strength of the welded joints is equal to or exceeds that of the base metal of L5 aluminum when applying the parameters used in this trial. The diffusion zone width of main alloying elements increases and hardness of the friction weld zone near TC4 titanium alloy side improves after post-weld heat treatment.The friction welding joint between TC4 and LD10 alloy with low specific magnetism under external electromagnetic field was realized for the first time. By means of measurement and analysis of the microstructure, width of plastic deformation zone, hardness distribution, diffusion width and tensile strength, the influence of the electromagnetic field on the microstructure and mechanical properties of friction welded joints between TC4 and LD10 alloy has been studied. The results indicate that the width of plastic deformation zone of friction welding joint between TC4 and LD10 alloy increased under the electromagnetic field and the diffusion zones of main alloying elements become wider, especially the electromagnetic field is applied during the forging process. The tensile strength of friction welding joint improves obviously when the electromagnetic field is applied during the forging...