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    STP1418

    Correlation Between Subsize and Full-size Charpy Impact Properties of Neutron-Irradiated Reactor Pressure Vessel Steels

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    Abstract

    The correlation between subsize and full-size Charpy impact properties of reactor pressure vessel steels have been investigated using 1/3 and 1/4 subsize specimens cut from the broken halves of full-size specimens irradiated to 2.7 × 1023 n m-2 (E>lMeV) at 288 °C. We found that ductile-to-brittle transition temperature (DBTT) and upper shelf energy (USE) of subsize specimens have good correlation with those of full- size specimens irrespective of steel types and irradiation conditions, and the shift in the DBTT due to irradiation embrittlement is independent of specimen size. In addition, 1/4 size Charpy data have more scatter than 1/3 size data. Based on the results, we propose a new method to correlate the absorbed energy curve obtained by the subsize test with that by the full-size test. This correlation method is capable to predict adjusted reference temperatures and USEs used in surveillance test programs.

    Keywords:

    subsize Charpy specimen, radiation embrittlement, ductile-to-brittle transition temperature, instrumented Charpy impact test, correlation


    Author Information:

    Dohi, K
    Research scientist, research fellow and senior research fellow, Komae Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), Tokyo,

    Soneda, N
    Research scientist, research fellow and senior research fellow, Komae Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), Tokyo,

    Onchi, T
    Research scientist, research fellow and senior research fellow, Komae Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), Tokyo,

    Matsui, H
    Professor, Institute for Materials Research, Tohoku University, Ibaraki-ken,


    Committee/Subcommittee: E10.02

    DOI: 10.1520/STP10818S