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<p>The nickel-based superalloys are used in the field of hydrogen storage and transport where cryogenic temperatures are often required. The combined influence of hydrogen and cryogenic temperatures on their mechanical performance remains largely unexplored. In this work, the fracture behavior of alloy 718 was investigated using a slow strain rate testing (SSRT). The results at room temperature (RT) with and without previous gaseous hydrogen charging have been compared to the SSRT results obtained at 4.2&#xa0;K using the same testing procedure. The findings show a pronounced embrittling effect due to hydrogen at room temperature, whereas no embrittlement was observed at cryogenic temperatures, which is attributed to limited hydrogen diffusivity at 4.2&#xa0;K.</p>

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Fracture Characteristics of a Hydrogen-Charged Nickel-Based Superalloy 718 at Cryogenic Temperatures

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Marina Lukas,
  • Nina Damm,
  • Jan Platl,
  • Andreas Drexler,
  • Matthias Eichinger,
  • Magdalena Eskinja,
  • Gregor Mori,
  • Zoltán Simon,
  • Michael Scheerer,
  • Gerald Ressel,
  • Stefan Marsoner,
  • Vsevolod I. Razumovskiy

摘要

The nickel-based superalloys are used in the field of hydrogen storage and transport where cryogenic temperatures are often required. The combined influence of hydrogen and cryogenic temperatures on their mechanical performance remains largely unexplored. In this work, the fracture behavior of alloy 718 was investigated using a slow strain rate testing (SSRT). The results at room temperature (RT) with and without previous gaseous hydrogen charging have been compared to the SSRT results obtained at 4.2 K using the same testing procedure. The findings show a pronounced embrittling effect due to hydrogen at room temperature, whereas no embrittlement was observed at cryogenic temperatures, which is attributed to limited hydrogen diffusivity at 4.2 K.