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    STP956

    A Study of Radiation Induced Voids and Precipitates and Their Annealing Behavior by Small-Angle Neutron Scattering

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    Abstract

    We have studied the annealing response of an irradiated pressure vessel steel, ASTM A302B, using small-angle neutron scattering. We have used two sets of specimens in this study, one irradiated to a fluence of 3 to 4 × 1019 n/cm2 at 288°C, and the other a parallel set of the same steel in the unirradiated condition. We have annealed specimens from each set isothermally at 300, 350, 400, and 450°C for increasing periods of time up to five h, and have observed the variations in the SANS spectra in both irradiated and unirradiated specimens. Changes in the small-angle neutron scattering (SANS) spectra commence at 300°C for the unirradiated material and at 400°C in the irradiated material. The observed response suggests that the changes are caused basically by the precipitation of copper out of solid solution in α-iron during the annealing of unirradiated and irradiated specimens; in the case of the irradiated specimens, the release of damage-induced defects enhances the precipitation of the copper.

    Keywords:

    nuclear pressure vessel steels, precipitation, small-angle neutron scattering (SANS), annealing damage, radiation damage, precipitation


    Author Information:

    Ukpong, IE
    Graduate research assistant in mechanical and aerospace engineering, University of Missouri-Columbia, C. R. State,

    Krawitz, AD
    Professor of mechanical and aerospace engineering, University of Missouri-Columbia, Columbia, MO

    Mildner, DFR
    Senior research scientist at University of Missouri Research Reactor and associate professor of physics, University of Missouri-Columbia, Columbia, MO

    Leighly, HP
    Professor of metallurgical engineering, University of Missouri-Rolla, Rolla, MO


    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP25669S