STP1270

    The Dependence of Radiation Hardening and Embrittlement on Irradiation Temperature

    Published: Jan 1996


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    Abstract

    Assessments of the hardening and embrittlement of pressure vessel steels and welds as a function of neutron dose use trend curves derived from surveillance programmes and accelerated irradiation data. A temperature dependent factor is incorporated for assessing vessel locations operating at different temperatures. As hardening and embrittlement arise from the sum of matrix damage and copper impurity precipitation, the influence of irradiation temperature on each process needs to be established. For irradiations performed below ~300°C recent data shows that the dose-dependent growth of copper precipitates ceases at a mean diameter of about 2 nm that also corresponds to peak hardening and embrittlement by copper. For doses beyond this peak copper dose the property-dependence on irradiation temperature can be identified with that of matrix damage alone. An analysis of several experiments on plate steels, performed at differing irradiation temperatures, has permitted the temperature dependence of matrix hardening to be defined by the simple empirical factor FT=1.869-4.57×10-3T where T is the irradiation temperature. When a linear correlation between irradiation hardening and embrittlement is observed, then FT can be used to analyse the temperature dependence of matrix embrittlement. The validity of using FT in successfully correlating irradiation results has been demonstrated for several plate steels and welds with differing copper contents.

    Keywords:

    Irradiation temperature, pressure vessel steels, hardening, embrittlement, copper precipitation


    Author Information:

    Jones, RB
    Principal Engineer, Nuclear Electric plc, Berkeley Technology Centre, Berkeley, Glos.

    Williams, TJ
    Consultant, Fracture Technology, Rolls-Royce and Associates Limited, Raynesway, Derby


    Paper ID: STP16495S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP16495S


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