Volume 5, Issue 8 (September 2008)

    Effects of Surface Morphology and Distributed Inclusions on the Low Cycle Fatigue Behavior of Miniaturized Specimens of F82H steel

    (Received 8 March 2007; accepted 12 July 2008)

    Published Online: 2008

    CODEN: JAIOAD

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    Abstract

    Depending on the pulse lengths, the operating conditions, and the thermal conductivity, oscillating temperature gradients will cause elastic and elastic-plastic cyclic deformation giving rise to (creep) fatigue in the structural first wall and blanket components of a nuclear fusion reactor. Small specimen testing technology (SSTT) and related remote control testing techniques are indispensable for the effective use of the limited volumes of materials test reactor and proposed intense neutron sources for the fusion materials test. In order to perform an accurate fatigue lifetime assessment using small specimens, the effects of material factors (surface morphology, inclusion, etc.) on low cycle fatigue (LCF) is mandatory. In this work, the LCF properties of reduced activation ferritic/martensitic steel (F82H IEA heat) were examined for three kinds of surface morphology using miniaturized hourglass-type fatigue specimens (SF-1), and a correlation between LCF crack initiation/propagation and distribution of inclusions was found. Fracture surfaces and crack initiation sites were investigated by scanning electron microscopy (SEM).


    Author Information:

    Kim, S. W.
    Graduate School of Energy Science, Kyoto University, Uji, Kyoto

    Tanigawa, H.
    Japan Atomic Energy Agency, Tokai-Mura, Ibaraki-ken

    Hirose, T.
    Japan Atomic Energy Agency, Tokai-Mura, Ibaraki-ken

    Kohyama, A.
    Institute of Advanced Energy, Kyoto University, Uji, Kyoto


    Stock #: JAI101104

    ISSN: 1546-962X

    DOI: 10.1520/JAI101104

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    Author
    Title Effects of Surface Morphology and Distributed Inclusions on the Low Cycle Fatigue Behavior of Miniaturized Specimens of F82H steel
    Symposium Fifth Symposium on Small Specimen Test Techniques, 2007-02-01
    Committee E10