A novel reduction-bonding process to fabricate stainless steel clad plate

摘要

SUS304 stainless steel and plain carbon steel were successfully bonded by hot rolling after reduction descaling in pure hydrogen in this study. Shearing and peeling tests were performed according to the ASTM A264-03 standard and the ASTM D903-98 standard to evaluate the bond properties. The interfacial microstructures, composition diffusion and peel morphologies of the clad plate were obtained to study the effect of rolling parameters on bond interfaces. The experimental results indicate that the surface of plain carbon steel produces plenty of cracks and pores after reduction by hydrogen, the thickness of reduction layer is 7-8 mu m and the decarburized layer appears between the reduction layer and the substrate. The minimum shear strength and peel strength reaches 82 MPa and 108 N.mm(-1) respectively at 1223 K in the first pass with a deformation rate of 20.7%. The maximum shear strength and peel strength is up to 368 MPa and 515 N.mm(-1) at 1323 K after six rolling passes with an accumulated deformation rate of 74.5%. The maximum peel strength is greater than the strength of carbon steel substrate, and the shear strength and peel strength of clad plate vary directly as accumulative deformation rate and bonding temperature. Both the quantity and dimension of interfacial pores drop rapidly, and the bonding dimples become denser as the accumulative deformation rate increases. Embedment of some regions forms by the multiple passes hot rolling at the interface, and increases the interfacial bonding strength. An excellent reduction-bonding process can be employed to manufacture stainless steel clad plate. (C) 2014 Elsevier B.V. All rights reserved.