The effect of specimen thickness on the environmental crack growth rate (CGR) of alloy 600 (UNS N06600) in high-temperature water was studied. Results showed the environmentally induced CGR in high-temperature water did not change when the alloy 600 specimen thickness changed from 1 mm to 6 mm. Loading that enhanced plane stress conditions promoted transgranular (TG) cracking, and loading that reduced plane stress conditions promoted intergranular (IG) cracking. Results suggested that the criteria for fracture mechanics plane strain testing are too restrictive (conservative) for environmental testing purposes.

Subject
Test methods, Water, Intergranular stress corrosion cracking, Tubes, Fracture surfaces, Transgranular stress corrosion cracking, Stress cracking, Stress, Tubing, Crack length, Fracture, Alloys, Stress corrosion cracking
Keywords:
alloy 600, environmental corrosion, fracture mechanics, intergranular stress corrosion cracking, plane strain, plane stress, specimen thickness, testing, transgranular stress corrosion cracking
NACE International
1995
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