Mechanochemical model to predict stress corrosion crack growth of stainless steel in high temperature water

This paper presents a predictive methodology for SCC crack growth using a m echanochemical model based on a slip formation/dissolution mechanism. The m echanochemical model consists of the combined kinetics of the plastic defor mation process as a mechanical factor and the slip dissolution-repassivatio n process as an environmental factor at a crack tip. The predictive equation of SCC crack growth rate for type 304 SS in water a t 288 degreesC is formulated as a function of stress intensity factor, mate rial conditions (degree of sensitization, K-ISCC. strain hardening coeffici ent) and water chemistry (water conductivity, corrosion potential). The the oretical predictions according to the mechanochemical model are quantitativ ely in good agreement with many experimental observations of the effect on SCC crack growth for type 304 SS in 288 degreesC water. (C) 2001 Elsevier S cience Ltd. All rights reserved.