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Static Crack Resistance of Heat-Resistant KhN43MBTYu Nickel-Chromium Alloy in Gaseous Hydrogen

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Strength of Materials Aims and scope

The effect of hydrogen at a pressure of up to 35 MPa and a content of up to 29 ppm on the strength, ductility, short-term and long-term static crack resistance of four KhN43MBTYu (EP-915VD) alloy modifications with different heat treatment modes and chemical composition has been studied. It has been found that the critical stress intensity factor KIc in the presence of hydrogen, just as the ductility characteristics of smooth specimens, depends on the deformation rate, reaching minimum values at rates of less than 0.1 mm/min. The fracture toughness decreases under the action of hydrogen by a factor of 2.5, and the plane strain state occurs at a much smaller specimen thickness. An optimal combination of high strength, ductility, short- and long-term static crack resistance in air and hydrogen has been achieved in a fine-grained alloy with low carbon and sulfur content. Based on the results of long-term static crack resistance tests at the predetermined maximum fatigue test duration of 300 h, the invariant characteristics of crack resistance, the threshold values of stress intensity factor in hydrogen, have been determined, which vary from 23 to 48 MPa ∙ m1 / 2 depending on the alloy heat treatment mode.

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Authors and Affiliations

  1. Karpenko Physico-Mechanical Institute, National Academy of Sciences of Ukraine, Lviv, Ukraine

    O. I. Balyts’kyi & L. M. Ivas’kevych

  2. West Pomeranian University of Technology in Szczecin, Szczecin, Poland

    O. I. Balyts’kyi & J. J. Eliasz

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  1. O. I. Balyts’kyi
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  2. L. M. Ivas’kevych
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  3. J. J. Eliasz
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Correspondence to O. I. Balyts’kyi, L. M. Ivas’kevych or J. J. Eliasz.

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Translated from Problemy Prochnosti, No. 3, pp. 61 – 74, May – June, 2020.

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Balyts’kyi, O.I., Ivas’kevych, L.M. & Eliasz, J.J. Static Crack Resistance of Heat-Resistant KhN43MBTYu Nickel-Chromium Alloy in Gaseous Hydrogen. Strength Mater 52, 386–397 (2020). https://doi.org/10.1007/s11223-020-00189-4

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