Volume 7, Issue 1 (January 2010)

    Interrelationship between True Stress–True Strain Behavior and Deformation Microstructure in the Plastic Deformation of Neutron-Irradiated or Work-Hardened Austenitic Stainless Steel

    (Received 2 February 2009; accepted 1 October 2009)

    Published Online: 2009

    CODEN: JAIOAD

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    Abstract

    True stress–true strain relation and deformation microstructure have been examined for high purity Fe-18Cr-12Ni alloy and its alloys doped with 0.7 wt % Si or 0.09 wt % C. In high purity alloy and C-doped alloy irradiated at 240°C up to 3 dpa, the work hardening rate is equivalent to that in unirradiated alloys. These alloys show dislocation channel structure after irradiation and deformation. In irradiated Si-doped alloy, however, the work hardening rate is different from that in unirradiated alloys. This alloy shows fully developed dislocation cell structure after deformation, as seen in unirradiated deformed stainless steels. The cell structure in irradiated Si-doped alloy was much smaller than that in unirradiated Si-doped alloy and in type 316L stainless steel. One of the factors affecting the change in the work hardening rate of irradiated austenitic stainless steel at 240°C is strong obstacles such as γ precipitate that acts as dislocation pining and dislocation loops such as Frank loops that do not act as obstacles.


    Author Information:

    Kondo, K.
    Research Group for Corrosion Damage Mechanism, Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency, 2–4 Shirakata-Shirane, Tokai-mura, Ibaraki-ken

    Miwa, Y.
    Research Group for Corrosion Damage Mechanism, Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency, 2–4 Shirakata-Shirane, Tokai-mura, Ibaraki-ken

    Tsukada, T.
    Research Group for Corrosion Damage Mechanism, Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency, 2–4 Shirakata-Shirane, Tokai-mura, Ibaraki-ken

    Yamashita, S.
    Materials Monitoring Section, Fuels and Materials Department, Oarai Research and Development Center, Japan Atomic Energy Agency, 2–4 Shirakata-Shirane, Tokai-mura, Ibaraki-ken

    Nishinoiri, K.
    Materials Monitoring Section, Fuels and Materials Department, Oarai Research and Development Center, Japan Atomic Energy Agency, 2–4 Shirakata-Shirane, Tokai-mura, Ibaraki-ken


    Stock #: JAI102358

    ISSN: 1546-962X

    DOI: 10.1520/JAI102358

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    Author
    Title Interrelationship between True Stress–True Strain Behavior and Deformation Microstructure in the Plastic Deformation of Neutron-Irradiated or Work-Hardened Austenitic Stainless Steel
    Symposium Presented at the ASTM 24th Symposium on Effects of Radiation on Nuclear Materials and the Nuclear Fuel Cycle, 2008-06-26
    Committee E10