STP551: Potential for Improvement of Mechanical Properties in Zircaloy Cold-Rolled Strip and Sheet

    Kaufmann, PD
    Zirconium metallurgist and technical director, Teledyne Wah Chang Albany, Albany, Ore.

    Baroch, EF
    Zirconium metallurgist and technical director, Teledyne Wah Chang Albany, Albany, Ore.

    Pages: 11    Published: Jan 1974


    Abstract

    A summary of mechanical properties representing several thousand Zircaloy-4 channel blanks is presented. The data show a wide variation in elevated-temperature mechanical properties.

    Investigation of the effect of variations in ingot chemistry on mechanical properties is discussed. The effect of the elements carbon, silicon, tin, and oxygen on elevated-temperature yield strength is statistically significant, but does not account for the total magnitude of the variation in mechanical properties observed. Although it does not represent an actual material variation, tensile testing strain rate was found to have a very significant effect on elevated-temperature yield strength values. Further experimental work was performed to investigate the effect of fabrication variables on elevated-temperature yield strength. The most influential processing parameter on elevated-temperature yield strength of the resultant product was the hot-rolling temperature. A 20 to 30 percent variation in yield strength was observed between alpha-rolled and beta-rolled material. This variation existed even after subsequent cold rolling and recrystallization. The primary difference between these two products was shown to be the difference in preferred orientation. The elevated-temperature transverse yield strength and bend ductility were improved by beta rolling, while the product uniformity, corrosion resistance, and tensile elongation were decreased. The limitations as well as potential improvements in mechanical properties which could be obtained through processing variations are discussed.

    Keywords:

    Zircaloys, zirconium, tensile properties, yield strength, beta rolling, bend properties, texture, chemical effects, channel material, zirconium alloys, irradiation


    Paper ID: STP32108S

    Committee/Subcommittee: B10.02

    DOI: 10.1520/STP32108S


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