Редколлегия Физикохимия Поверхности и Защита Материалов - Silicon as an Alloying Element in Ferrite Stainless Steels Containing 8frame013% Cr

Silicon as an Alloying Element in Ferrite Stainless Steels Containing 813% Cr

I. I. Reformatskaya^a, I. G. Rodionova^b, A. N. Podobaev^a,
I. I. Ashcheulova^a, and E. V. Trofimova^a

^a FGUP GNTs RF Karpov Institute of Physical Chemistry, ul. Vorontsovo Pole 10, Moscow, Russia
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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.