1999 Volume 48 Issue 12 Pages 815-821
The dissolution behavior during the SCC process of type 304, type 316 and type 430 stainless steels was investigated in 0.82 kmol/m3 HCl or 0.82 kmol/m3 chloride (pH 1.0) solutions by using ICP under constant applied stress or constant slow strain rate condition. In addition, the maximum stress (σmair) of the specimens interrupted at various elongations undera constant applied stress was measured at room temperature by using an Instron tensile maschine. The dissolution behavior of the specimens under both the conditions changed at tss, the transition time in corrosion elongation curve and at tm at which a stress becomes the maximum stress (σm) obtained under constant slow strain rate; that is, the dissolution rate before tss and tm was larger than that after those. The σmair decreased with time up to failure, but showed a rapid small change at tss. The results obtained were discussedin terms of the number of cracks, selective dissolution, active dissolution and reduction in cross sectional area.