STP956

    Irradiation Embrittlement Evaluation Without Lateral Expansion Measurements

    Published: Jan 1987


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    Abstract

    It is progressively felt that the lateral expansion criterion should be included for the determination of the transition temperature for irradiation embrittlement studies as this criterion compensates for the effects of irradiation induced increases in the strength. Lateral expansion measurements on irradiated specimens require specially designed jigs and time consuming remote measurements to be made inside a shielded cell. Results generated on eighth A533 and A508 category of pressure vessel steels and weldments containing copper contents up to 0.125 wt%, phosphorous contents up to 0.015 wt%, and subjected to fast neutron fluences (>1 MeV) of the order of 1 × 1019 n/cm2 at 290°C were analyzed to find out whether fixed energy criterion alone could be used instead of lateral expansion criterion. The adjusted reference temperature RTNDT of these irradiated steels and weldments, as obtained from the unirradiated reference temperature RTNDT according to the American Society of Mechanical Engineers (ASME) Code, Section III, and the temperature shift at 41J absorbed energy (ΔT41J), were compared with the reference temperature RTNDT of the irradiated steels and weldments as obtained directly as per ASME Code, Section III. It was observed that in practically all these materials, the latter values were conservative. It was found that for these steels and weldments, if 68J absorbed energy criterion is used, no lateral expansion measurements need to be carried out.

    Keywords:

    irradiation embrittlement, lateral expansion, absorbed energy, Charpy V-notch requirements, RT, NDT, base metal, weld, weld heat affected zone, transition temperature, transition temperature shift, fluence


    Author Information:

    Chatterjee, S
    Scientific officer, scientific officer, head of postirradiation examination section, and associate director of metallurgy group, Radiometallurgy Division, Bhabha Atomic Research Center, Trombay, Bombay

    Anantharaman, S
    Scientific officer, scientific officer, head of postirradiation examination section, and associate director of metallurgy group, Radiometallurgy Division, Bhabha Atomic Research Center, Trombay, Bombay

    Sivaramakrishnan, KS
    Scientific officer, scientific officer, head of postirradiation examination section, and associate director of metallurgy group, Radiometallurgy Division, Bhabha Atomic Research Center, Trombay, Bombay

    Roy, PR
    Scientific officer, scientific officer, head of postirradiation examination section, and associate director of metallurgy group, Radiometallurgy Division, Bhabha Atomic Research Center, Trombay, Bombay


    Paper ID: STP25670S

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP25670S


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