dK/da effects on the SCC growth rates of nickel base alloys in high-temperature water

The effect of dK/da on crack growth behavior of nickel base alloys has been studied by conducting stress corrosion cracking tests under positive and negative dK/da loading conditions on Alloys 690, 600 and X-750 in high temperature water. Results indicate that positive dK/da accelerates the SCC grow...

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Bibliographic Details
Published in:Journal of nuclear materials 2018-05, Vol.503, p.13-21
Main Authors: Chen, Kai, Wang, Jiamei, Du, Donghai, Andresen, Peter L., Zhang, Lefu
Format: Article
Language:English
Subjects:
Alloys
Corrosion tests
Crack growth rate
Crack propagation
dK/da
Growth rate
High temperature
High temperature water
Nickel
Nickel alloys
Nickel base alloys
Nuclear chemistry
Strain hardening
Strain rate
Stress corrosion
Stress corrosion cracking
Water temperature
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Summary:The effect of dK/da on crack growth behavior of nickel base alloys has been studied by conducting stress corrosion cracking tests under positive and negative dK/da loading conditions on Alloys 690, 600 and X-750 in high temperature water. Results indicate that positive dK/da accelerates the SCC growth rates, and the accelerating effect increases with dK/da and the initial CGR. The FRI model was found to underestimate the dK/da effect by ∼100X, especially for strain hardening materials, and this underscores the need for improved insight and models for crack tip strain rate. The effect of crack tip strain rate and dK/dt in particular can explain the dK/da accelerating effect.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2018.02.032