STP939

    Effect of Metallurgical Variables and Temperature on the Fracture Toughness of Zirconium Alloy Pressure Tubes

    Published: Jan 1987


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    Abstract

    This paper summarizes the results from over 300 fracture toughness tests on compact specimens taken from zirconium alloy pressure tubing, primarily Zircaloy-2 and cold-worked Zr-2.5Nb. Test conditions include temperatures from 20 to 300°C, varying hydrogen concentrations and hydride orientations, irradiation at several temperatures, and irradiation times up to ten years. A thorough analysis of the results shows that strength and hydride orientation are the principal factors affecting toughness. An extremely steep ductile-brittle transition is observed in alloys containing hydride platelets in the radial (through-wall) orientation.

    Keywords:

    Zircaloy-2, Zr-2.5Nb, fracture toughness, J, -resistance curve, zirconium hydrides, ductile-brittle transition, irradiation, pressure tubes


    Author Information:

    Simpson, LA
    Atomic Energy of Canada Limited, Whiteshell Nuclear Research Establishment, Pinawa, Manitoba

    Chow, CK
    Atomic Energy of Canada Limited, Whiteshell Nuclear Research Establishment, Pinawa, Manitoba


    Paper ID: STP28145S

    Committee/Subcommittee: B10.02

    DOI: 10.1520/STP28145S


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