Influence of laser remelting on organization, mechanical properties and corrosion resistance of Fe-based amorphous composite coating

Abstract

Laser cladding and laser remelting methods were adopted to prepare Fe-based amorphous coating on H13 steel surface. And the organization and properties after laser cladding and laser remelting were compared. The results show that, the amorphous content of the coating decreased after laser remelting, and arc crystalline band was formed in the coating, at the same time, after laser remelting, the elements were in ladder-shaped distribution in the amorphous region and crystalline region. After laser remelting, defects on the coating like cracks or pores decreased obviously, but there was a transcrystalline crack extending to the matrix through the crystalline region in the remelting laser beam . The hardness of the crystalline region after remelting increased by about 200 HV compared with that in the amorphous region, and the overall corrosion resistance of the remelting layer was higher than the cladding layer. • Amorphous coating without obvious defects on the upper surface was prepared. • The laser-remelted coating hardness was increased for existence of large amount of hardening phases in the crystalline region • The overall corrosion resistance of the laser-remelted coating was improved due to the elimination of cracks and other defects.