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Report No.

Study on irradiation assisted stress corrosion cracking of austenitic stainless steels in nuclear energy environments (Thesis)

Nakano, Junichi

Irradiation assisted stress corrosion cracking (IASCC) is known as a degradation phenomenon that is caused by synergistic effects of neutron /$$gamma$$ irradiation, stress/strain and high temperature water on structural materials. It is important to investigate stress corrosion cracking (SCC) and IASCC mechanisms from the viewpoint of the safety and reliability improvement in the nuclear energy system. To evaluate the influence of minor additional elements, heat treatment, cold working and neutron fluence on IASCC behavior, a slow strain rate technique facility for irradiated specimens has been developed and post irradiation examinations have been conducted. Based on results obtained from the IASCC studies, discussion regarding IASCC susceptibility, crack initiation and growth behaviors are described comprehensively in this paper.



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