STP633

    Hydride Reorientation and Fracture in Zirconium Alloys

    Published: Jan 1977


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    Abstract

    Under conditions of high tensile stress, the Zr-2.5Nb alloy has been shown to he susceptible to a very slow crack propagation failure mechanism. This failure mechanism, hydride cracking, has been studied extensively since leaks developed in the pressure tubes of Reactor Units 3 and 4 at Ontario Hydro's Pickering Nuclear Generating Station in Aug. 1974. The failures have been attributed to reorientation and preferential redistribution of hydrides under high tensile stresses, followed by progressive fracture of these hydrides. Mechanical tests, acoustic emission data, and metallographic studies relevant to this mechanism will be presented and related to the occurrence of cracks in the Zr-2.5Nb reactor pressure tubes.

    Keywords:

    zirconium, hydrides, tensile stress, hydride cracking, fatigue (materials), acoustics


    Author Information:

    Simpson, CJ
    Engineer, Nuclear Metallurgy, NDE engineer, and acoustic emission engineer, Ontario Hydro, Research Division, Toronto, Ontario,

    Kupcis, OA
    Engineer, Nuclear Metallurgy, NDE engineer, and acoustic emission engineer, Ontario Hydro, Research Division, Toronto, Ontario,

    Leemans, DV
    Engineer, Nuclear Metallurgy, NDE engineer, and acoustic emission engineer, Ontario Hydro, Research Division, Toronto, Ontario,


    Paper ID: STP35595S

    Committee/Subcommittee: B10.02

    DOI: 10.1520/STP35595S


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