The dissolution behavior during the SCC process of type 304, type 316 and type 430 stainless steels was investigated in 0.82 kmol/m
3 HCl or 0.82 kmol/m
3 chloride (pH 1.0) solutions by using ICP under constant applied stress or constant slow strain rate condition. In addition, the maximum stress (σ
mair) 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 (σ
m) obtained under constant slow strain rate; that is, the dissolution rate before
tss and
tm was larger than that after those. The σ
mair 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.
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