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Effects of transformation on texture and iodine stress corrosion cracking resistance of zircaloy sheet

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Abstract

A two-step heat treatment was developed as a means of maximizing the basal texture of Zircaloy-4 sheet. The heat treatment, consisting of a brief beta heat treatment and subsequent controlled cooling, resulted in a Kearns number (fn) of 0.83 with a microstructure of uniformly fine grains and high hardness. The texture component, as determined by the crystallite orientation distribution function (CODF), was (0002)(10−10). The result was discussed in terms of phase transformation, either diffusional or martensitic, incurred by controlled cooling. The rate of stress corrosion cracking (SCC) of the alloy was evaluated with constant deflection tests in an iodine environment. The exponentn of the relationshipda/dt = C · (Kl n was found to correlate with fn for KI, ranging from 4 to 17 MPa√m.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, Inha University, 402-751, Inchon, Korea

    S. K. Hwang (Professor)

  2. Republic of Korea Army, 402-751, Inchon, Korea

    H. S. Ryoo

  3. Department of Mineral Science and Materials Engineering, University of California, 94720, Berkeley, CA

    J. W. Morris (Professor)

Authors
  1. S. K. Hwang
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  2. H. S. Ryoo
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  3. J. W. Morris
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Formerly Graduate Student, Department of Metallurgical Engineering, Inha University.

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Hwang, S.K., Ryoo, H.S. & Morris, J.W. Effects of transformation on texture and iodine stress corrosion cracking resistance of zircaloy sheet. Metall Trans A 22, 2247–2256 (1991). https://doi.org/10.1007/BF02664990

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