STP939: Influence of Variations in Early Fabrication Steps on Corrosion, Mechanical Properties, and Structure of Zircaloy-4 Products

    Charquet, D
    Senior Engineer, Centre de Recherches CEZUS, Ugine,

    Steinberg, E
    Department Manager, Zircaloy Tubes, KWU, Erlangen,

    Millet, Y
    Senior Engineer, Centre de Recherches CEZUS, Ugine,

    Pages: 36    Published: Jan 1987


    Abstract

    Variations in fabrication schedule, beta quenching, extrusion temperature, and intermediate and final annealing were performed in order to study the influence on workability of tube shells and technological properties of final cladding tubes. The mechanical properties of the final tubes depend on the final heat treatment and slightly on the first steps of the fabrication sequence, leading to small differences in the grain size. In addition, the nodular corrosion resistance was investigated. The nodular corrosion sensitivity of the recrystallized cladding tubes points out the influence of the early fabrication steps: The increase of the alpha annealing temperature in any fabrication step is detrimental. Among the tubes tested in this program those with the best nodular corrosion resistance in the high-pressure steam test had the worst behavior using ASTM Practice for Aqueous Corrosion Testing of Samples of Zirconium and Zirconium Alloys (G 2). During the ASTM G 2 test the weight gain of the external surface of the tubes was higher than the weight gain of the internal surface.

    Keywords:

    Zircaloy-4, tube, nodular corrosion, uniform corrosion, creep, tensile strength, recrystallization, quenching, cold working, structure, texture


    Paper ID: STP28136S

    Committee/Subcommittee: B10.02

    DOI: 10.1520/STP28136S


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