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<p>The influence of aging of heat-resistant nickel KhN56MBYuD alloy, quenched at a&#xa0;temperature of 1253 K, after aging in hydrogen at a&#xa0;pressure of 30 MPa for 15 h at temperatures of 923, 953, 1023, and 1123 K on the alloy strength and plasticity characteristics under active tension in air and hydrogen at a&#xa0;pressure of 30 MPa was studied. The intermetallic compounds content in the alloy structure, hardness, and strength increase, while the plasticity characteristics decrease, accompanied by a&#xa0;significant increase in the alloy sensitivity to hydrogen embrittlement with an increase in the aging temperature. The maximum negative influence of hydrogen was observed after 50 h of aging at 953 K, causing the intermetallic content to increase to 16.3 wt%, the ultimate strength in hydrogen decreased by 33%, and the relative elongation and reduction area decreased in 6&#xa0;and 5&#xa0;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&#xa0;temperature of 873 K. The influence of hydrogen increased with the decrease in the values of long-term loading and deformation rates.</p>

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

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • L. M. Ivaskevych

摘要

The influence 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 temperatures of 923, 953, 1023, and 1123 K on the alloy strength and plasticity characteristics under active tension in air and hydrogen at a pressure of 30 MPa was studied. The intermetallic compounds content in the alloy structure, hardness, and strength increase, while the plasticity characteristics decrease, accompanied by a significant increase in the alloy sensitivity to hydrogen embrittlement with an increase in the aging temperature. The maximum negative influence of hydrogen was observed after 50 h of aging at 953 K, causing the intermetallic content to increase to 16.3 wt%, the ultimate strength in hydrogen decreased by 33%, and the relative elongation and reduction 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 influence of hydrogen increased with the decrease in the values of long-term loading and deformation rates.