An overview on the microstructure and properties of Fe/Ti based dissimilar joints

Abstract

Joining of Ti and Fe-based alloys is challenging due to the formation of deleterious phases at the interface. Since fusion welding is unsuitable for the purpose, over the years, many solid-state welding techniques have been tried. This review provides a comparison of different solid-state joining methods used for Fe/Ti alloys with focus on the structural transformations in base materials, effect of process parameters on interface microstructure, its evolution and kinetics with thermal aging and structure–property correlation. Structural transformations in diffusion couples (near-equilibrium condition) are compared with those in weldments and a perspective is provided on the role of defects and alloying additions in enhancing/retarding reaction zone formation under both equilibrium and non-equilibrium conditions.

Molecular Dynamic Simulation and Experiment Validation on the Diffusion Behavior of Diffusion Welded Fe-Ti by Hot Isostatic Pressing Process

“…By combining Ti alloys with structural steels, bimetal composites can be produced at a reduced cost, which is advantageous for promoting their wide application [ 5 ]. To achieve this, a reliable Fe-Ti bonding interface is necessary [ 6 ]. Various welding methods were employed for this purpose, including ultrasonic welding [ 7 ], laser welding [ 8 ], friction welding [ 9 ], and diffusion welding [ 5 ].…”

“…Lin et al [ 6 ] utilized ultrasonic welding to weld Ti and steel and analyzed changes in interface microstructure and bonding strength. Zhang et al [ 8 ] employed laser welding to join Ti alloy and stainless steel, without filler metal, and then they used Ta/V/Fe [ 10 ] as an interlayer to produce a joint between Ti and stainless steel.…”