STP824: Variation in the Strain Anisotropy of Zircaloy with Temperature and Strain

    Hindle, ED
    Principal scientific officer and higher scientific officer, United Kingdom Atomic Energy Authority, Springfields Nuclear Power Development Laboratories, Salwick, Preston, Lancashire

    Worswick, D
    Principal scientific officer and higher scientific officer, United Kingdom Atomic Energy Authority, Springfields Nuclear Power Development Laboratories, Salwick, Preston, Lancashire

    Pages: 24    Published: Jan 1984


    Abstract

    The strong crystallographic texture which is developed during the fabrication of zirconium-based alloys causes pronounced anisotropy in their mechanical properties, particularly deformation.

    The tendency for circular-section tension specimens with a high concentration of basal poles in one direction to become elliptical when deformed in tension has been used in this study to provide quantitative data on the effects of both strain and temperature on strain anisotropy. Tension tests were carried out over a temperature range of 293 to 1193 K on specimens machined from Zircaloy-2 plate. The strain anisotropy was found to increase markedly at temperatures over 923 K, reaching a maximum in the region of 1070 K. The strain anisotropy increased with increasing strain in this temperature region.

    The study was extended to Zircaloy-4 pressurized-water reactor fuel cladding by carrying out tube swelling tests and evaluating the axial deformation produced. Although scatter in the test results was higher than that exhibited in the tension tests, the general trend in the data was similar.

    The effects of the strain anisotropy observed are discussed in relation to the effects of temperature on the ductility of Zircaloy fuel cladding tubes during postulated large-break loss-of-coolant accidents.

    Keywords:

    Zircaloy-2, Zircaloy-4, nuclear industry, nuclear fuel cladding, plastic deformation, oxidation, pressurized water reactors, loss-of-coolant accident, strain anisotropy, burst tests, tension tests, texture


    Paper ID: STP34468S

    Committee/Subcommittee: B10.02

    DOI: 10.1520/STP34468S


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