Evaluation of dissimilar IN-۶۲۵/SS-۳۱۶L joint welded by using transient liquid phase bonding method

Dissimilar welding of Inconel ۶۲۵ superalloy (IN-۶۲۵) to AISI-۳۱۶L austenitic stainless steel (SS-۳۱۶L) by using ۲۵ μm thick AWS-BNi۳ nickel base interlayer and transient liquid phase (TLP) bonding was carried out and the structure and mechanical properties of bonded specimens was examined. TLP bonding was performed at ۱۰۵۰-۱۲۵۰°C temperature range for ۵-۲۰min under the shielding of argon atmosphere. The microstructural and mechanical evaluations revealed that the increasing of bonding temperature and time result in out-diffusion of melting point reducing elements from bonding zone and progresses of isothermal solidification. The increasing of temperature from ۱۰۵۰°C to ۱۱۵۰°C and bonding time up to ۲۰min caused completion of isothermalsolidification and significant increasing of shear strength of bonded specimens.

Keywords:

TLP , IN-۶۲۵ , SS-۳۱۶L , Isothermal solidification.