Evaluation of the KhN56MBYuD alloy embrittlement under long-term action of hydrogen and high temperatures

Keywords

nickel alloy, intermetallics, hardness, short-term and long-term strength, plasticity, creep, time to fracture.

Cite as

Ivaskevych L. M. Evaluation of the KhN56MBYuD alloy embrittlement under long-term action of hydrogen and high temperatures. Physicochemical Mechanics of Materials. 2025. 61(5), 090-096.

https://doi.org/10.15407/pcmm2025.05.090

Abstract

The effect of aging of heat-resistant nickel KhN56MBYuD alloy, quenched at a temperature of 1253 K, after aging in hydrogen at a pressure of 30 MPa for 15 h at temperature of 923; 953; 1023, and 1123 K on its strength and plasticity characteristics under active tension in air and hydrogen at a pressure of 30 MPa was studied. It was found that with an increase in the aging temperature, the content of intermetallic compounds in the alloy structure, hardness, and strength increase, while the plasticity characteristics decrease, accompanied by a significant increase in its sensitivity to hydrogen embrittlement. The maximum negative effect of hydrogen was observed after 50 h of aging at 953 K, as a result of which the intermetallic content increased to 16.3 wt%, the ultimate strength in hydrogen decreased by 33%, and the relative elongation and reduction of area decreased in 6 and 5 times, respectively. The time to failure of the samples also decreased by half, and their relative elongation decreased by 33–40% under the creep and long-term strength tests in hydrogen at a temperature of 873 K. The effect of hydrogen increased with a decrease in the values of long-term loading and deformation rates.

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