Effect of intergranular carbides on the cracking behavior of cold worked alloy 690 in subcritical and supercritical water

•The intergranular (IG) carbides were found to have detrimental effects on the cracking in cold worked Alloy 690.•Removing IG carbides by prior solution annealing could effectively decreases the cracking growth rate.•The detrimental effect of IG carbides is more significant in subcritical water than...

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Bibliographic Details
Published in:Corrosion science 2020-03, Vol.164, p.108313, Article 108313
Main Authors: Chen, Kai, Wang, Jiamei, Shen, Zhao, Du, Donghai, Guo, Xianglong, Zhang, Lefu, Andresen, Peter L.
Format: Article
Language:English
Subjects:
Carbides
Cold work
Cold working
Corrosion effects
Crack propagation
Crack tips
Creep
Grain boundaries
Nickel alloy
Nickel base alloys
Oxidation
Strain rate
Stress corrosion cracking
Superalloys
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Summary:•The intergranular (IG) carbides were found to have detrimental effects on the cracking in cold worked Alloy 690.•Removing IG carbides by prior solution annealing could effectively decreases the cracking growth rate.•The detrimental effect of IG carbides is more significant in subcritical water than in supercritical water.•The detrimental effect of IG carbides has been well explained through high-resolution characterization. The effect of intergranular (IG) carbides on the cracking behavior of cold worked Alloy 690 was studied in both subcritical and supercritical water (SCW) environments. The crack growth rate (CGR) was lower when IG carbides were removed by prior solution annealed (SA) treatment, indicating a detrimental effect of IG carbides. The presence of IG carbides enhances the local strain accumulation at the grain boundary due to the lattice mismatch, thus promotes the crack tip strain rate and increases the CGR. The detrimental effect of IG carbides is more significant in subcritical water than in SCW, which can be attributed to the different controlling parameters of cracking between these two environments. The widely recognized beneficial effect of IG carbides on stress corrosion cracking in Alloy 600 is detrimental in cold worked Alloy 690, which might be related to the different degrees of grain boundary oxidation that contributed to IG cracking.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2019.108313