Analysis of mechanisms inducing corrosion cracking of irradiated austenitic steels and development of a model for prediction of crack initiation

Boris Margolin,Alexander Sorokin,Natalia Pirogova,Aki Toivonen,Faiza Sefta, Cédric Pokor

Engineering Failure Analysis（2020）

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摘要

•Mechanisms having a potential effect on IASCC in the LWR primary coolant environment were analyzed.•Predominant mechanisms effected on IASCC were revealed.•A crack initiation criterion of IASCC was formulated and a model of IASCC initiation was developed.•The model supports the existence of the IASCC threshold stresses dose dependence.•The model allows one to calculate the time before IASCC initiation.

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关键词

RPV internals,Austenitic steels,Irradiation assisted stress corrosion cracking,Neutron irradiation,Damage dose,Localized deformation,Grain boundary sliding,Passive film,Constant load tests,Slow strain rate tests,Intergranular fracture,Creep,Microcrack,Constitutive equations

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