Investigation of the microstructure and mechanical properties of dissimilar brazed joint of Inconel 625 and 316L austenitic stainless steel

Microstructural and mechanical properties of dissimilar bonding of INCONEL 625 and 316L austenitic stainless steel using AWS BNi-2 has been evaluated. The bonding process was done at 1020◦C for 30،60 and 120 minutes، respectively with Argon protection followed by homogenization at the temperature of 1080◦C for 4 hour. Chemical analysis from the joint clearance microstructure and mechanical data indicated that the higher the bonding time from 30 to 120 minutes، the lower fraction of precipitates at the joint centerline. Given this، the ultimate shear tensile strength raised from 265 MPa to 360 MPa. Post-bonding homogenization led to more uniform microstructure along with mechanical properties. Moreover، the ultimate shear tensile strength increased to 520 MPa، too.