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.

KEYWORDS:

• 304L austenitic steel
• Ti-based alloy
• solid state welding
• intermetallic phases
• diffusion couple
• explosive cladding
• friction welding
• heat treatment

Acknowledgements

The authors thank Dr. A.K. Bhaduri, former Director, Indira Gandhi Centre for Atomic Research (IGCAR), Dr. Shaju K. Albert and Dr. S. Raju former Directors, Metallurgy and Materials Group, IGCAR for their sustained encouragement and support.

Disclosure statement

No potential conflict of interest was reported by the author(s).