STP1325: Effects of Damage Rate on Irradiation Hardening and Post-irradiation Annealing Characteristics of Carbon Steel

    Suzuki, M
    Principal engineer, Japan Atomic Energy Research Institute, Ibaraki-ken,

    Idei, Y
    chief, Japan Atomic Energy Research Institute, Ibaraki-ken,

    Kizaki, M
    Chief, Japan Atomic Energy Research Institute, Ibaraki-ken,

    Onizawa, K
    research engineer, Japan Atomic Energy Research Institute, Ibaraki-ken,

    Pages: 9    Published: Jan 1999


    Abstract

    Irradiation embrittlement in a low dose region was studied for an aluminum-killed carbon steel from the point of dose rate effects. The dose rate as low as ∼5x108 n/cm2/s (E> 1MeV) caused a Charpy transition temperature shift of more than 30°C after irradiation to ∼1017n/cm2 (E>1MeV) at 240°C, while a similar amount of Charpy shift was observed after ∼1018n/cm2 (E >1MeV) at higher dose rate (∼7x1011n/cm2/s). The effect of dose rate was obvious in the annealing response on hardness. The recovery characteristics indicated that more stable defects were produced in the material irradiated at a lower dose rate.

    Keywords:

    irradiation embrittlement, carbon steel, pressure vessel, dose rate effect, Charpy shift, irradiation hardening, ageing, low flux, post-irradiation annealing, recovery


    Paper ID: STP13876S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP13876S


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