STP870

    Influence of Applied Stress on Swelling Behavior in Type 304 Stainless Steel

    Published: Jan 1985


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    Abstract

    The swelling behavior of Type 304 stainless steel during stress application was investigated by means of electron irradiation using a high-voltage electron microscope (HVEM). The dose dependence of swelling under stress is similar to the linear-after-incubation swelling scheme of other electron irradiation studies. The effect of applied stress on the swelling characteristics appeared through the control of incubation regime of swelling rather than of the swelling rate. The incubation dose first increases, then decreases, and increases again with increasing applied stress. The prominent finding in this study, based on the advantage of HVEM in situ observation, is that the saturated void density is equal to the number density of interstitial dislocation loops observed in the early stage of irradiation. Essentially, applied stress affects the loop nucleation process. The dislocation loop density then affects the incubation dose of swelling through its control of dislocation behavior and the saturation dose of dislocation density.

    Keywords:

    Type 304 stainless steel, applied stress, high-voltage electron microscopy, electron irradiation, void density, dislocation loop density, incubation dose, swelling rate, void growth rate, loop growth rate, void nucleation, dislocation loop nucleation, radiation


    Author Information:

    Igata, N
    Professor, research associate, research associate, and graduate student, University of Tokyo, Tokyo,

    Kohno, Y
    Professor, research associate, research associate, and graduate student, University of Tokyo, Tokyo,

    Tsunakawa, H
    Professor, research associate, research associate, and graduate student, University of Tokyo, Tokyo,

    Fujihira, T
    Professor, research associate, research associate, and graduate student, University of Tokyo, Tokyo,


    Paper ID: STP37367S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP37367S


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