RT - Journal Article T1 - Structural and Mechanical Evaluation of Dissimilar Transient Liquid Phase Bonded IN-625 /SS-316L JF - JWSTI YR - 2022 JO - JWSTI VO - 8 IS - 1 UR - http://jwsti.iut.ac.ir/article-1-405-en.html SP - 101 EP - 112 K1 - TLP K1 - Inconel 625 K1 - 316L K1 - isothermal solidification K1 - microstructure and hardness AB - In the present study, the microstructure and mechanical properties of the dissimilar joint of Inconel 625 (IN-625) superalloy to austenitic stainless steel AISI316L (SS-316L) via AWS-BNi3 interface layer and transient liquid phase (TLP) bonding process were evaluated and necessary conditions for creating an efficient joint were determined. TLP bonding was performed in temperature and time range of 1050-1150ºC and 5-20min, respectively, under the protection of argon shielding gas with a purity of 99.9995%. Microstructural (OM and SEM) and phase (XRD) studies revealed that bonding at 1150 ° C for 20 min results in completion of isothermal solidification and develops a uniform gamma (γ) phase at the bonding zone. Cooling the samples before completion of isothermal solidification results in the formation of chromium and molybdenum-rich eutectic compounds at the bonding centerline. The continuous morphology of the eutectic compounds caused a sharp drop in the shear strength of the specimens (~50% reduction of shear strength). The inter-diffusion of alloying elements between the bonding area and the surrounding base metal results in the formation of chromium carbide in the IN-625 and chromium- boron compounds in the SS-316L, which increased the microhardness of these areas compared to the base metals and the bonding zone. LA eng UL http://jwsti.iut.ac.ir/article-1-405-en.html M3 ER -