The Effect of the Process Temperature on the Bondability in Diffusion Bonding of Ferritic (AISI 430) with Martensitic (AISI 420) Stainless Steels

The effect of process temperature on the bondability of ferritic (AISI-430) and martensitic (AISI-420) stainless steels was studied. Diffusion bonding was investigated experimentally under a protective atmosphere at various temperatures and a defined constant pressure. Microstructure examinations were carried out by the help of SEM and EDS. Hardness values were measured by HV scale under a load of 150 g. A mutual migration of Cr and C atoms was observed, causing a relatively hard microstructure along the interface. Best mechanical and metallurgical properties were observed for the specimen bonded at 1100°C process temperature at 12 MPa, for 20 min.