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    Irradiation Behavior of Nickel-Chromium-Molybdenum Type Weld Metal


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    The irradiation and recovery behavior of a nickel-chromium-molybdenum type weld metal with 0.27 weight percent copper was examined mainly with tension, impact, drop-weight, and fracture-mechanics specimens up to a thickness of 100 mm. After irradiation at about 6 × 1019 neutrons (n)/cm2 (E > 1 MeV) at 310°C, the impact tests show larger temperature shift than for the drop-weight and fracture-mechanics tests. Recovery annealing was done at 350 (only hardness measurements), 400, 450, 500, and 550°C. Reasonable recovery effects were observed after annealing for 60 h at 450°C. For complete recovery, annealing between 500 and 550°C is necessary. Direct transfer of the test results to light water reactors is not possible, as the irradiation temperature of the specimens was 30 K higher than the operating temperature of reactor pressure vessels.


    irradiation embrittlement, high-copper weld metal, postirradiation annealing, recovery behavior, mechanical properties, tension test, impact test, drop-weight test, fracture-mechanics test, temperature shift

    Author Information:

    Klausnitzer, EN
    Kraftwerk Union Aktiengesellschaft, Erlangen,

    Gerscha, A
    Kraftwerk Union Aktiengesellschaft, Erlangen,

    Leitz, C
    Kraftwerk Union Aktiengesellschaft, Erlangen,

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP38170S