STP939: Upper and Lower Bound Crystal Plastic Modelling of Creep Loci of Zircaloy

    Murty, KL
    Professor and Graduate Student, North Carolina State University, Raleigh, NC

    Mahmood, ST
    Professor and Graduate Student, North Carolina State University, Raleigh, NC

    Adams, BL
    Assistant Professor, Brigham Young University, Provo, UT

    Pages: 15    Published: Jan 1987


    Abstract

    Biaxial creep of Zircaloy was examined in the cold-worked and recrystallized conditions in terms of creep loci at constant creep dissipation. Model predictions were made using the lower and upper bounding schemes along with the statistical averaging of crystallite behavior through the crystallite orientation distribution functions (CODF). Textural modifications following recrystallization treatment were found to have a negligible effect on the slip predictions based on easy slip on basal, prism, or pyramidal planes. The differences in the deformation behaviors of the cold-worked stress-relieved (CW-SR) and recrystallized materials were shown to arise from changes in the slip mode, basal slip being dominant in CW-SR and prism slip in recystallized materials. Deviations between the experimental results and model predictions brought out the importance of pyramidal slip in biaxial creep of Zircaloy materials. Dominance of basal slip in the CW-SR material is believed to be due to the hardening of the prismatic planes during fabrication.

    Keywords:

    zirconium alloys, creep, anisotropy, loci, biaxial deformation, texture, slip, crystallite orientation, distribution function, recrystallization


    Paper ID: STP28111S

    Committee/Subcommittee: B10.02

    DOI: 10.1520/STP28111S


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