VとCrまたはNbとCrを含む溶融硼砂浴中で鋼に形成された複合炭化物

概要

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When carbon steels had been were immersed in molten borax baths containing both Fe-V (or Fe-Nb) and metallic Cr at 850-1050°C, two kinds of carbides were observed in the layer formed on the steel surface. One carbide was VC (or NbC) crystal structure containing small amount of Cr element, and the other was M7C3 containing some V (or Nb) and Fe elements. The M7C3 phase increased with the addition ratio of Cr to V (or Nb) in the baths, and was generally formed in the layer contacting the substrate. The activation energy for the growth of the complex carbide layer was smaller than that of VC (or NbC) layer formed in baths containing V (or Nb), and larger than that of Cr7C3+Cr23C6 layer formed in baths containing Cr. The complex carbide layer showed as high hardness and excellent wear resistance as VC layer, and as good oxidation resistance as Cr carbide layer.
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