STP1325

    Investigation of the Development of Irradiation - Induced Precipitates in VVER-440-Type Reactor Pressure Vessel Steels and Weld Metals after Irradiation and Annealing

    Published: Jan 1999


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    Abstract

    The development of irradiation-induced precipitates in VVER-440 type reactor pressure vessel steels 15Kh2MFA and weld metals SV-10KhMFT during irradiation and post-irradiation annealing is studied by small angle neutron and X-ray scattering. The kinetic conditions for the precipitation of particles, which already exist in the unirradiated state, seem to be improved at temperatures of about 270°C due to the irradiation. The size distribution of the irradiation-induced precipitates depends on the copper content and differs between weld and base metal. A strong correlation between the formation of irradiation-induced precipitates and the irradiation hardening is found. The hardness nearly linearly depends on the number of these precipitates.

    Keywords:

    pressure vessel steel, radiation hardening, embrittlement, annealing, small angle neutron scattering, anomalous small angle X-ray scattering, microstructure


    Author Information:

    Große, M
    Research scientists the Institute for Safety Research at the Research Center Rossendorf Inc., Dresden,

    Nitzsche, P
    Research scientists the Institute for Safety Research at the Research Center Rossendorf Inc., Dresden,

    Böhmert, J
    leader of the Neutron Embrittlement Division, Institute for Safety Research at the Research Center Rossendorf Inc., Dresden,

    Brauer, G
    Leader of the Positron Group of TU Dresden, Research Center Rossendorf, Dresden,


    Paper ID: STP13874S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP13874S


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