STP939: Prevention of Delayed Hydride Cracking in Zirconium Alloys

    Cheadle, BA
    Atomic Energy of Canada Limited, Research Company, Chalk River Nuclear Laboratories, Metallurgical Engineering Branch, Chalk River, Ontario

    Coleman, CE
    Atomic Energy of Canada Limited, Research Company, Chalk River Nuclear Laboratories, Metallurgical Engineering Branch, Chalk River, Ontario

    Ambler, JFR
    Atomic Energy of Canada Limited, Research Company, Chalk River Nuclear Laboratories, Metallurgical Engineering Branch, Chalk River, Ontario

    Pages: 17    Published: Jan 1987


    Abstract

    Zirconium alloys are susceptible to a mechanism for crack initiation and propagation called delayed hydride cracking. From a review of component failures and experimental results, we have developed the requirements for preventing this cracking. The important parameters for cracking are hydrogen concentration, flaws, and stress; each should be minimized. At the design and construction stages hydrogen pickup has to be controlled, quality assurance needs to be at a high enough level to ensure the absence of flaws, and residual stresses must be eliminated by careful fabrication and heat treatment.

    Keywords:

    zirconium alloys, hydrogen concentration, stress, flaws, delayed hydride cracking, prevention of cracking


    Paper ID: STP28122S

    Committee/Subcommittee: B10.02

    DOI: 10.1520/STP28122S


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