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    STP1175

    Fracture Toughness and Impact Tests on Neutron Irradiated Ferritic Steels : Results and Correlations

    Published: 01 January 1994


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    Abstract

    Four A533B pressure vessel steels containing 0.16 wt% copper, nickel and phosphorous ranging from 0.10 to 0.82 wt% and 0.006 to 0.02 wt% respectively, and a AISI 403 stainless steel, a typical end fitting material used in pressurised heavy water reactors, in the unirradiated condition, were evaluated by instrumented impact testing to determine the crack initiation energy (CVNi), total absorbed energy (CVN), ductilebrittle transition temperature (T41J,T0.89mm), dynamic yield strength (σyd) and dynamic initiation fracture toughness (Kid). Three of these steels were irradiated at 563K to a nominal fast fluence of 1x1019, n/cm2 (E > 1 MeV) and the corresponding parameters were evaluated.

    It was observed that the widely used correlation between CVN and KIC modified as (Kidyd)2 = 0.64[(CVN/σyd)-0.01] overpredicted the experimental Kid values by a factor of 2. However, if the CVNi was used instead of CVN, the predicted values were within ± 20%.

    The irradiation induced decrease in Kid could not be correlated with increase in transition temperature. However, it could be correlated with the corresponding changes in σyd and CVNi values.

    Keywords:

    instrumented impact testing, ferritic steels, crack initiation energy, upper shelf fracture toughness, empirical correlation


    Author Information:

    Chatterjee, S
    Group Leader, Scientific Officers, Bhabha Atomic Research Centre, Trombay, Bombay,

    Sriharsha, HK
    Group Leader, Scientific Officers, Bhabha Atomic Research Centre, Trombay, Bombay,

    Viswanathan, UK
    Group Leader, Scientific Officers, Bhabha Atomic Research Centre, Trombay, Bombay,


    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP23938S