Interdiffusion behavior in 304L SS/Ti–5Ta–2Nb system

• Published in: Journal of alloys and compounds 2019-11, Vol.808, p.151726, Article 151726
• Main Authors: Prasanthi, T.N., Sudha, C., Raju, S., Saroja, S.
• Format: Article
• Language: English
• Subjects: 304L stainless steel; Austenitic stainless steels; Bonded joints; Diffusion; Equilibrium conditions; Explosive bonding; Explosive cladding; Interdiffusion; Intermetallic phases; Mathematical analysis; Reaction kinetics; Titanium base alloys; Ti–5Ta–2Nb alloy; Wagner's method; σ phase
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2019.151726

This paper presents the results of an experimental and computational study on interdiffusion and related structure-property changes in 304 L stainless steel/Ti–5Ta–2Nb system. Diffusion annealing treatments were carried out in the temperature range of 873–1173 K, above and below the β transus temperature of Ti. The formation of σ, FeTi and Fe2Ti phases at the interface as well as stabilization of α-Fe and β-Ti in 304 L SS and TiTaNb respectively has been unambiguously established in this study. Growth kinetics of the reaction zones has been determined and effective interdiffusion coefficients in various phases were calculated using Wagner's approach. Temperature dependant variations in the mechanical property of the base materials and diffusion couples have also been predicted using JMatPro® and compared with literature. Finally, the evolution of microstructure at the interface and diffusion path in the diffusion couples were compared with SS/Ti based diffusion bonded joints and explosive clads to understand the interdiffusion behavior under equilibrium and non-equilibrium conditions. •Interdiffusion studies carried out in 304L SS/Ti–5Ta–2Nb system for the first time.•Diffusion studies carried out above and below β transus temperature of Ti alloy.•Formation of σ, FeTi, Fe2Ti & Stabilization of α-Fe and β-Ti confirmed in reaction zone.•Temperature dependant variation in properties predicted & compared with literature.•Interface microstructure, diffusion path compared with explosive clads & diffusion bonds.