In this study, a 304 stainless steel (304 SS)/20 carbon
steel (20
CS) bimetal was prepared by vacuum diffusion bonding, with 20 CS as
the substrate and 304 SS as the cladding layer, and the interfacial
microstructure and bonding strength before and after solution treatment
were studied. The 304 SS and The 20 CS formed a strong metallurgical
bond after being held at 1380 °C for 60 min without defects such
as unbonded regions. Diffusion of Cr and Ni atoms from the 304 SS
to the 20 CS occurred, and the C atoms diffused from the 20 CS to
the 304 SS, forming a carburized region. A pearlitic region with an
average width of approximately 20 μm was formed on the 20 CS
side. After solution treatment, austenitization was formed in the
carburized region, which was accompanied by the formation of twin
crystals. The interfacial bonding strength of the bimetal was measured
to be 485 MPa, which increased to 547 MPa after the solution treatment.