STP286: Effect of Neutron Irradiation on Charpy V and Drop-Weight Test Transition Temperatures of Various Steels and Weld Metals

    Hawthorne, J. R.
    U. S. Naval Research Laboratory, Washington, D. C.

    Steele, L. E.
    U. S. Naval Research Laboratory, Washington, D. C.

    Pages: 25    Published: Jan 1960


    Abstract

    Charpy V-notch and drop-weight specimens were used to determine changes in transition temperature for various steels and weld metals irradiated in different nuclear and thermal environments to integrated fast neutron flux exposures to 2 × 1019 nvt (<1.0 Mev). The Brookhaven Graphite Reactor, the Oak Ridge Low-Intensity Test Reactor (LITR), and National Reactor Test Station Materials Testing Reactor (MTR) were used for the irradiations at temperatures under 200 F and at 575 F. Irradiations to integrated fast neutron flux levels of 5 × 1018 nvt effected 40 to 100 F shifts in transition temperature. Increasing the irradiation temperature from 200 to 575 F significantly decreased the radiation-induced damage. Transition temperature shifts in the order of 250 F were developed in materials irradiated at temperatures less than 200 F to an integrated fast neutron flux dosage of 1 × 1019 nvt. Postirradiation heat treatment revealed that a recovery of properties may be obtained by annealing. Comparison of Charpy V and drop-weight nil-ductility transition temperature shifts for 20 irradiation experiments demonstrated excellent correspondence in the evaluation of irradiation effects by these two test methods.


    Paper ID: STP46364S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP46364S


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