INTERGRANULAR CORROSION OF STAINLESS STEELS UNDER TRANSPASSIVE CONDITIONS : STUDY OF SILICON SEGREGATION IN TILT BICRYSTALS

1 January 1990

journal article
Published by EDP Sciences in Le Journal de Physique Colloques

Vol. 51 (C1) , C1-641
https://doi.org/10.1051/jphyscol:19901101

Abstract

Intergranular corrosion of austenitic stainless steels under transpassive conditions depends strongly on silicon content of the steel. A linear relation between intergranular corrosion rate at constant electrochemical potential in the transpassive range and silicon content at grain boundaries has been found. The electrochemical corrosion test has been applied to study the misorientation dependence of silicon segregation in symmetrical stainless steel tilt bicrystals containing 0.3 and 0.8 wt.% Si. The correlation segregation-structure has been explained by the variation of interplanar spacing of planes d(hkl)/a parallel to the grain boundary with the misorientation angle. The intergranular segregation of silicon increases when the interplanar spacing d increases

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