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Influence of the Functional Layer on the Operating Characteristics of Zr – 1% Nb Alloy at a Temperature of 380°С

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We study the influence of thermal treatment of fuel cladding tubes in various gas media on the short-term and long-term strengths at an operating temperature (380°C). The thermochemical treatment in nitrogen-containing media increases the short-term strength of annular specimens by ~ 30 MPa in the tests carried out in air at 380°C. At the same time, treatment in oxygen-containing media somewhat (by ~ 15 MPa) decreases this parameter. The highest long-term strength on a base of 100 h is exhibited by annular specimens after thermochemical treatment in nitrogen. The thermochemical treatment in oxygen-containing media guarantees a long-term strength of the tubes on the same level as after the standard heat treatment of fuel cladding tubes made of Zr – 1% Nb zirconium alloy. We reveal the character of fracture of the annular specimens of Zr – 1% Nb zirconium alloy depending on the medium and the mode of thermal treatment.

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Authors and Affiliations

  1. Karpenko Physicomechanical Institute, National Academy of Sciences of Ukraine, Lviv, Ukraine

    V. S. Trush, V. М. Fedirko & A. G. Lukyanenko

  2. Institute of Solid-State Physics, Materials Science, and Technologies, National Science Center “Kharkiv Institute of Physics and Technology”, National Academy of Sciences of Ukraine, Kharkiv, Ukraine

    V. М. Voyevodin, P. І. Stoev & V. А. Panov

Authors
  1. V. S. Trush
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  2. V. М. Fedirko
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  3. V. М. Voyevodin
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  4. A. G. Lukyanenko
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  5. P. І. Stoev
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  6. V. А. Panov
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Correspondence to V. S. Trush.

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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 57, No. 2, pp. 87–91, March–April, 2021.

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Trush, V.S., Fedirko, V.М., Voyevodin, V.М. et al. Influence of the Functional Layer on the Operating Characteristics of Zr – 1% Nb Alloy at a Temperature of 380°С. Mater Sci 57, 234–239 (2021). https://doi.org/10.1007/s11003-021-00537-y

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  • DOI: https://doi.org/10.1007/s11003-021-00537-y

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