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Optimization of the Medium of Thermal Treatment of GFE-1 Hafnium Alloy

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Materials Science Aims and scope

We optimize the conditions of thermochemical treatment of the plates (~ 1 mm) made of GFE-1 hafnium alloy after plastic deformation from the viewpoint of the influence of interstitial elements (oxygen) on the solid-solution hardening of the subsurface layers and the fatigue durability of the hafnium specimens subjected to symmetric pure bending. It is shown that the thermochemical treatment (T = 850°C, τ = 2 h) performed in the oxygen-containing gaseous atmosphere at P = 1.33·10−2 Pa leads to the formation of a diffusion-hardened subsurface layer on the GFE-1 hafnium specimens, which increases their fatigue life (for the strain amplitude ± ε a = 0.6%) as compared with the other levels of pressure of the same medium. The fracture of the specimens of GFE-1 hafnium alloy subjected to the thermochemical treatment in oxygen-containing rarefied gas atmospheres under various pressures is investigated.

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Authors and Affiliations

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

    V. S. Trush, V. M. Fedirko & O. H. Luk’yanenko

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

    K. V. Kovtun

Authors
  1. V. S. Trush
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  2. V. M. Fedirko
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  3. O. H. Luk’yanenko
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  4. K. V. Kovtun
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Correspondence to V. M. Fedirko.

Additional information

Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 53, No. 2, pp. 61–65, March–April, 2017.

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Trush, V.S., Fedirko, V.M., Luk’yanenko, O.H. et al. Optimization of the Medium of Thermal Treatment of GFE-1 Hafnium Alloy. Mater Sci 53, 194–199 (2017). https://doi.org/10.1007/s11003-017-0062-2

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  • DOI: https://doi.org/10.1007/s11003-017-0062-2

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