CLADDING OF CHROMIUM ONTO MILD-STEEL BY LOW-PRESSURE LASER SPRAYING

Clad layers of chromium onto a mild steel substrate are obtained by lo w-pressure laser spraying and their composition dependence on impinged energy density is studied in detail with their microstructure and mic rohardness. When impinged energy density E(i) is selected to be 64 W m m(-2), the obtained clad layer consists of a Cr30Fe70 alloy. The thick ness of the alloying layer decreases with decreasing impinged energy d ensity E(i). A single phase of chromium grows when E(i) is selected to be smaller than 13 W mm(-2). The presence of CrFe alloying layer extr emely enhances corrosion resistance on steel surface.