SCC growth tests were conducted under simulated BWR water condition on type 316L stainless steel with different cold rolling ratios of 10% to 40%. In the test, each 1T-CT specimen was applied constant load and the resultant initial stress intensity factor ranged from 20MPam to 30MPam⁠. Increasing cold rolling ratios and K values resulted in a very high crack growth rate. However, the cracking morphology with high cold rolling ratios and K values was quite different form that observed in the actual components. The crack morphology of 40% cold rolled specimen, for example, was trans-granular one which is different from that observed in the heat affected zone (HAZ) of the cracked PLR pipes. Only 10% cold rolled specimen showed inter-granular cracking, the same cracking morphology as that in HAZ of the cracked PLR pipes. This result suggests that the heavily cold rolled specimens should not be used to obtain crack growth data to predict SCC depth in the actual components because on the different cracking morphology.

Subject
Crack growth, Materials, Piping, Intergranular stress corrosion cracking, Surface hardness, Transgranular stress corrosion cracking, Rolling, Intergranular cracking, Crack length, Electric potential, Stainless steel, Hardness, Stress corrosion cracking
Keywords:
stress corrosion cracking, cold rolling, crack growth test, BWR
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2006
Association for Materials Protection and Performance (AMPP)
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