Abstract
A jumpwise improving of the passivation ability and pitting-resistance of the Fe-(8–13)% Cr-(0.32–2.7)% Si alloys upon surpassing the limit of ∼14–15 at % by the chromium and silicon summary concentration is found. It is suggested that the nature of the critical summary concentration C Cr + C Si is identical to that in Fe-Cr binary alloys; it is caused by the silicon building-in to the alloy’s crystal lattice and its substitution for chromium in the statistical proportion to its atomic part in alloys. When the summary concentration C Cr + C Si approaches ∼14–15 at %, each elementary cell in the Fe bcc lattice must necessarily contain either a Cr atom or the proportional number of Si atoms. The improved passivation ability and pitting-resistance of the Fe-Cr-Si alloy, compared with the Fe-Cr alloys, is explained by the fayalite formation at the alloy surface.
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Original Russian Text © I.I. Reformatskaya, I.G. Rodionova, A.N. Podobaev, I.I. Ashcheulova, E.V. Trofimova, 2006, published in Zashchita Metallov, 2006, Vol. 42, No. 6, pp. 591–597.
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Reformatskaya, I.I., Rodionova, I.G., Podobaev, A.N. et al. Silicon as an alloying element in ferrite stainless steels containing 8–13% Cr. Prot Met 42, 549–554 (2006). https://doi.org/10.1134/S0033173206060051
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DOI: https://doi.org/10.1134/S0033173206060051