The Effect of Compressive Residual Stress on the Primary Water Stress Corrosion Cracking of Alloy 600 TT Steam Generator Tubings

摘要

The effect of compressive residual stress on the primary water stress corrosion cracking behavior was investigated, based on the J-1 and J-2 nuclear power plant data. The following analyses were performed, such as (i) Weibull slope; (ii) crack growth rate; (iii) average crack length, (iv) crack length distribution. Alloy 600 TT exhibits strong heat to heat variations in its sensitivity to PWSCC. Crack growth rate was retarded after shot-peeing. The compressive residual stress induced by shot-peening was more effective on new, short cracks, than on existing, long cracks. However, whether the 'new' cracks were initiated after peening is an unresolved issue, due to the present ECT sensitivity limit.