STP782

    Comparative Irradiation Study of Reactor Pressure-Vessel Steel Weld Metals

    Published: Jan 1982


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    Abstract

    Charpy-V specimens of several test welds made of MnMo, MnCrMo, MnNiMo and MnNiCrMo types were irradiated simultaneously in two series at 315°C and 285°C, respectively, with neutron fluences between 8 × 1018 and 5 × 1019 n/cm2 (E>1 MeV). The known influence of copper on the 41 J temperature shift (ΔT41) was clearly detected for variations from 0.08 to about 0.3%. A considerable variation in embrittlement of low copper (below 0.08%) welds was not traceable to copper or phosphorus. Obviously it is related to variations of the nickel content (up to 1.7%). The effects of copper and nickel seem to be independent on each other. Both, however, have an influence on the slope of the ΔT41 against fluence curves. The effects of other elements as silicon, phosphorus, arsenic, manganese, chromium, molybdenum and of welding procedure and welding flux are discussed in the paper. Due to over-lapping, these effects could not be clearly defined. The Charpy-V upper shelf energy drop shows an effect equivalent to overaging: The shelf drop recovers by further irradiation in the region of 1 to 4 × 1019n/cm2 for all low copper weld metals except that with 1.7% nickel. The shelf drop sequence of the materials tested is in general similar to ΔT41 sequence with some differences in detail.

    Keywords:

    light water reactor, pressure vessel steel, weld metal (ferritic), irradiation embrittlement, Charpy-V test, transition temperature shift, upper shelf reduction, alloy element influence, residual element influence


    Author Information:

    Leitz, C
    Division of Materials and Chemistry, Kraftwerk Union AG (KWU), Erlangen,

    Gerscha, A
    Division of Materials and Chemistry, Kraftwerk Union AG (KWU), Erlangen,

    Hofmann, G
    Division of Materials and Chemistry, Kraftwerk Union AG (KWU), Erlangen,

    Strobel, H-J
    Division of Materials and Chemistry, Kraftwerk Union AG (KWU), Erlangen,


    Paper ID: STP34358S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP34358S


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