Evaluation of transient liquid phase bonding of Hastelloy C۲۷۶ and ۳۱۶ Austenitic Stainless Steel using the BNi-۲ interlayer

In the present study, the effect of bonding time on the microstructure and mechanical properties of Hastelloy C۲۷۶ and ۳۱۶ austenitic stainless steel was investigated by the Transient Liquid Phase bonding method. the joining process was carried out at ۱۱۵۰ ◦C for ۵ and ۳۰ minutes using an BNi-۲ interlayer. An optical microscope and a scanning electron microscope equipped with an elemental analysis system were used to evaluate the microstructure. Vickers hardness test and shear strength test have been used to evaluate the mechanical properties. Findings showed that the isothermal solidification zone (ISZ) and the diffusion affected zone (DAZ) were detected in the bonding areas of ۵ and ۳۰ minutes. The ۳۱۶ austenitic stainless steel DAZ contains borides rich in Fe, Cr,and Ni. On the other hand, DAZ Hastelloy C۲۷۶ alloy contains rich borides of Ni, Cr, Mo, and W. Furthermore, as time increased, the hardness and shear strength at the center of the joint increased