Study on Microstructure and Properties of Titanium/Steel Hybrid Bonding Interface

Aiming at the difficulty of titanium/steel dissimilar metal connection, the titanium and steel are jointed through metallurgical and mechanical connection by surface structure design and powder metallurgy technology with the titanium alloy powders and marine steel. It is found out that the interface of titanium/steel hybrid joint is 100% bonded. The inter-diffusion of Fe and Ti elements helps to form the metallurgical bonding, and combining with the mechanical bonding, the tensile strength of the hybrid joint reaches 449 MPa, the shear strength reaches 299 MPa, and the impact energy reaches 31 J. The research results can meet the needs of titanium/steel welding such as realizing the joint of high-strength titanium alloy and steel, improving the impact toughness of the connection interface, and facilitating the application of titanium/steel joint in the curved surface structures.