Abstract
This study has shown that it is possible to elaborate interesting surface alloys by electric arc with special electrode on ferritic steels. The surface deposition of a Fe-30Cr-4C alloy on the VCO and VH13 steels is efficient in increasing the surface hardness and wear resistance of these steels due to high (Fe, Cr){sub 7}C{sub 3} carbide precipitation. The surface alloy also leads to an excellent resistance to oxidation at high temperature in isothermal conditions. The protection against the oxidation is assured, essentially, by a microcrystallized chromium oxide layer, which is formed due to the high chromium content in the surface alloy. Consequently, the surface alloy presents a stainless steel behavior with a reduction in the oxidation rate by a factor of 35 and 50, respectively, on the VH13 and VCO steels after 50 hours of oxidation (1 atm air) at 950 C.
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