Effects of Proton Irradiation on Reactor Pressure Vessel Steel and Its Model Alloys

    Volume 2, Issue 9 (October 2005)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Page Count: 8


    Shibamoto, H
    Japan Nuclear Cycle Development Institute, Narita, Oarai, Ibaraki,

    Kimura, A
    Professor, Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto,

    Hasegawa, M
    Professor, Institute for Materials Research, Tohoku University, Aoba-ku, Sendai,

    Matsui, H
    Professor, Institute for Materials Research, Tohoku University, Aoba-ku, Sendai,

    Yamaguchi, S
    Professor, Chiba Institute of Technology, Narasino-city, Chiba,

    (Received 11 June 2004; accepted 13 April 2005)

    Abstract

    Effects of proton irradiation on the reactor pressure vessel steel (RPVS), A533B cl. 1 have been investigated by means of positron lifetime and Vickers hardness measurement in comparison with those of the iron-copper model alloys. The specimens were irradiated with 1 MeV proton up to a fluence of 3 × 1017 ions/cm2 (0.2 dpa, displacement per atom, at a peak) at temperature below 80°C. The recovery behavior of the irradiation effects was also investigated during isochronal annealing for 30 min with a 25°C step from 100°C to 650°C. By positron annihilation technique, it was recognized that microvoids, which consist of about 5 vacancies with the number density of the order of 1016 /cm3, were formed by the irradiation. The number of microvoids decreased after a low temperature annealing and completely annihilated at 250°C, although irradiation hardening still remained. A large portion of the hardening recovered by the annealing up to 300°C and almost annealed out at 450°C. Irradiation response and its recovery behavior of A533B RPVS were discussed compared to the result of Fe-based model alloys.


    Paper ID: JAI12453

    DOI: 10.1520/JAI12453

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    Author
    Title Effects of Proton Irradiation on Reactor Pressure Vessel Steel and Its Model Alloys
    Symposium Effects of Radiation on Materials: 22nd International Symposium, 2004-06-10
    Committee E10