Mohammad Kian Vojdanpak, Behzad Niroumand, Morteza Shamanian,
Volume 9, Issue 2 (Journal OF Welding Science and Technology 2024)
Abstract
Stainless steels and titanium alloys are widely used in various industries such as chemical, medical, and aerospace due to their unique properties and characteristics and it is necessary to join these alloys together in some applications. Additionally, innovative methods for manufacturing metal parts through additive manufacturing have been developed in recent decades, but sufficient research on bonding these parts to conventional alloys has not yet been conducted. The current study aims to evaluate the bonding between austenitic 316L stainless steel and electron beam melted Ti-6242 alloy using transient liquid phase (TLP) bonding method. The TLP bonding was performed using a copper interlayer in a vacuum furnace and the effects of processing time and surface roughness on the bonding quality was investigated. To characterize the samples, optical and scanning electron microscopy (SEM), X-ray diffraction (XRD), shear strength tests and surface roughness measurements were employed. The results showed that reduction in the surface roughness led to increased shear strength of the joints. Moreover, bonding time had a significant effect on the elements diffusion, formation of intermetallic compounds such as FeTi and TiCu, and shear strength of the joints. The highest shear strength of 200 MPa was achieved at bonding conditions of 980 °C for 120 minutes and for the ground and polished surfaces.
