Effect of Surface Roughness of AISI8630 on Microstructure and Corrosion Resistance of Inconel625 Cladding Layer by Using Hot-wire TIG

Abstract

Surface roughness has a profound influence on the microstructure and properties of cladding layer. Clad Inconel625 on AISI8630 surface by using hot-wire TIG and the effect of surface roughness of AISI8630 on microstructure and corrosion resistance was studied. The microstructure and distribution of Fe element of cladding layer were analyzed by means of optical microscope (OM), energy dispersive spectroscopy (EDS), and scanning electron microscopy (SEM). Mass loss method was carried out to determine the corrosion ratio. The results indicate that with the reduction of surface roughness, the light trapping effect, dilution ratio and Fe content are all reduced and the grains become finer and are distributed more uniformly. When the surface roughness is decreased from 12.5μm to 0.4μm, the corrosion resistance of cladding layer is improved by more than 32%.

Keywords

• roughness
• cladding
• dilution ratio
• microstructure
• corrosion resistance