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Evaluation of the Influence of Hydrogen on the Mechanical Characteristics of Complexly Alloyed Nickel Alloys

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Materials Science Aims and scope

We study the influence of hydrogen under a pressure of up to 30 MPa with contents of up to 20 wppm on the strength, plasticity, low-cycle fatigue, and short- and long-term crack-growth resistances of five modifications of Ni56Cr17Mo6Nb4 alloy (KhN56MBYuD) (EK-62), which differ by the methods of metallurgical remelting, chemical compositions, and modes of heat treatment. It is shown that the fracture toughness in air and in hydrogen decrease as the grain size decreases and the yield strength and HRC hardness increase, which enables us to predict the changes in the crack resistance according to the data of hardness measurements of the surfaces of workpieces operating in hydrogen. The optimal combination of high strength, plasticity, and short- and long-term crack-growth resistances in air and in hydrogen is attained for the modification alloyed with boron (0.005 wt.%) and zirconium (0.044 wt.%). In the tests for long-term crack-growth-resistance carried out for 100 h, we established the invariant characteristics of crack-growth resistance, namely the threshold values of K IHST varying from 15 to 35 MPa∙m1/2 for different modifications of the alloy.

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Authors and Affiliations

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

    О. І. Balyts’kyi, V. М. Mochul’s’kyi & L. М. Ivas’kevych

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  1. О. І. Balyts’kyi
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  2. V. М. Mochul’s’kyi
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  3. L. М. Ivas’kevych
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Correspondence to О. І. Balyts’kyi.

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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 51, No. 4, pp. 91–99, July–August, 2015.

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Balyts’kyi, О.І., Mochul’s’kyi, V.М. & Ivas’kevych, L.М. Evaluation of the Influence of Hydrogen on the Mechanical Characteristics of Complexly Alloyed Nickel Alloys. Mater Sci 51, 538–547 (2016). https://doi.org/10.1007/s11003-016-9873-9

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