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Creep cavitation in a NiCr steel

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Abstract

Through creep tests at 823 K and intermittent cryogenic separation of grain boundaries of a NiCr steel with well-defined secondary stage creep, the continual cavity nucleation and diffusive growth models based on the linear relation between the cavity number and creep strain were examined. A one-dimensional (1-D) model[1] can predict rupture times within a factor of 2 and their stress exponents accurately and was supported by the stress dependence of the Monkman-Grant product. The area fraction of fully coalesced area (FCA) increased linearly with the density change of specimens and rupture occurred at FCA ∼ 0.5. Then, by treating FCA as a damage parameter and applying the Avrami equation, it was shown that the extended area of FCA was proportional toσ 2nt3, which led tot f ∼ σ−2n/3.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Seoul, Korea

    H. C. Cho (Graduate Student) & Jin Yu (Professor)

  2. Technical Center, Daewoo Heavy Industries, Inchun, Korea

    I. S. Park (Manager)

Authors
  1. H. C. Cho
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  2. Jin Yu
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  3. I. S. Park
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Cho, H.C., Yu, J. & Park, I.S. Creep cavitation in a NiCr steel. Metall Trans A 23, 201–210 (1992). https://doi.org/10.1007/BF02660865

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  • DOI: https://doi.org/10.1007/BF02660865

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