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<p>The characteristics of the short-term and long-term strength, low-cycle fatigue life, and static crack resistance of specimens of the KhN55MVTs alloy in the initial state and after hydrogen precharging at 773 K for 3 and 10 h (absorbed hydrogen content 4 and 12 ppm) were determined in helium and hydrogen at room temperature. Under the combined action of the hydrogen atmosphere and pre- absorbed hydrogen, the transverse contraction, fracture toughness, and time to fracture of specimens under a load of 120 MPa at a temperature of 1073 K decrease by a factor of 1.31-1.45. Cyclic changes in temperature in hydrogen at a pressure of 25 MPa in the range of 293-1223 K and low-cycle bending significantly enhance the effect of hydrogen on ductility and low-cycle fatigue life, but their values remain quite high, indicating a high hydrogen resistance of the ChS-57 alloy with solid-solution hardening and a small amount of carbide, nitride, and intermetallic precipitates, i.e., a homogeneous structure.</p>

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Estimation of the Degree of Hydrogen Embrittlement of the Heat-Resistant KHN55MVTS Nickel Alloy

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • O. I. Balytskyi,
  • L. M. Ivaskevych

摘要

The characteristics of the short-term and long-term strength, low-cycle fatigue life, and static crack resistance of specimens of the KhN55MVTs alloy in the initial state and after hydrogen precharging at 773 K for 3 and 10 h (absorbed hydrogen content 4 and 12 ppm) were determined in helium and hydrogen at room temperature. Under the combined action of the hydrogen atmosphere and pre- absorbed hydrogen, the transverse contraction, fracture toughness, and time to fracture of specimens under a load of 120 MPa at a temperature of 1073 K decrease by a factor of 1.31-1.45. Cyclic changes in temperature in hydrogen at a pressure of 25 MPa in the range of 293-1223 K and low-cycle bending significantly enhance the effect of hydrogen on ductility and low-cycle fatigue life, but their values remain quite high, indicating a high hydrogen resistance of the ChS-57 alloy with solid-solution hardening and a small amount of carbide, nitride, and intermetallic precipitates, i.e., a homogeneous structure.