Volume 3, Issue 1 (January 2006)

    Radiation-Induced Stress Relaxation of Welded Type 304 Stainless Steel Evaluated by Neutron Diffraction

    (Received 6 May 2004; accepted 16 July 2005)

    CODEN: JAIOAD

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    Abstract

    The welded Type 304 stainless steel specimens were neutron-irradiated up to 2 × 1025 n/m2 (E > 1MeV) at 561K in the Japan Material Testing Reactor (JMTR). The residual stresses in the test specimens were measured by neutron diffraction, and the radiation-induced stress relaxation was evaluated from the change of stress distributions along the direction transverse to the weld bead. The magnitudes of σX (transverse to the weld) and σY (longitudinal to the weld) residual stresses decreased steadily with increasing neutron fluence. The irradiation dose dependence and the mechanism for the relaxation were examined using an equation derived from the irradiation creep equation. There was a steep stress relaxation, which might correspond to transient creep, at the early stage of neutron irradiation near the weld, and the different radiation-induced relaxation behaviors could be observed depending on the distance from the weld. The radiation-induced stress relaxation for welding-induced residual stress, which was generated under a three-dimensional restriction, indicated the tendency to be slower compared to the fundamental results for mechanically applied stress.


    Author Information:

    Obata, M
    Toshiba Corp., Yokohama,

    Root, JH
    Director, Neutron Program for Materials Research, National Research Council Canada, Calk River Laboratories, Calk River, Ontario

    Ishiyama, Y
    Researcher, Nippon Nuclear Fuel Development Co., Ltd., Ibaraki-ken,

    Nakata, K
    Japan Nuclear Energy Safety Organization, Tokyo,

    Sakamoto, H
    Chief Specialist, Toshiba Corp., Yokohama,

    Anzai, H
    Senior Engineer, Hitachi, Ltd., Ibaraki-ken,

    Asano, K
    Senior Researcher, Tokyo Electric Power Company, Yokohama,


    Stock #: JAI12348

    ISSN: 1546-962X

    DOI: 10.1520/JAI12348

    ASTM International is a member of CrossRef.

    Author
    Title Radiation-Induced Stress Relaxation of Welded Type 304 Stainless Steel Evaluated by Neutron Diffraction
    Symposium Effects of Radiation on Materials: 22nd International Symposium, 2004-06-10
    Committee E10