Study on Metallurgical Bonding Mechanism of Dissimilar Metal Welding Interface Between Titanium Alloy and Steel
The microstructure,element distribution,intermetallic compounds,mechanical properties,and metallurgical bonding mechanism of the interface of titanium alloy/stainless steel dissimilar metal electron beam welding joints were systematically studied.The results indicate that a transition layer with a thickness of 2～5 μm is formed at the welding interface,and TiFe and TiFe2 intermetallic compounds are dispersed internally.Significant interdiffusion of Ti and Fe elements occurs at the interface.The tensile strength of the joint reaches 302 MPa,which is about 85％of the titanium alloy base material.The hardness of the interface transition layer(HV0.2)can reach up to 650,significantly higher than that of the base material.The study of interface metallurgical bonding mechanism reveals that rapid interdiffusion of elements at the interface during welding and the generation of appropriate intermetallic compounds are key to achieving reliable metallurgical bonding.Excessive intermetallic compounds can reduce the ductility of joints.Optimizing welding process parameters can effectively regulate the formation of intermetallic compounds and obtain high-strength and toughness welded joints.
titanium alloysteelwelding of dissimilar metalsmetallurgical combinationinterfaceintermetallic compounds
万方数据
维普
