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<p>We study the effect of duration of the exposure to hydrogen on the chemical compositions of the surface and inner layers of BB751P heat-resistant nickel alloy applied for manufacturing of the disks of aircraft engines. The samples were treated in a hydrogen atmosphere at 1473 K for 0, 15, 30 and 60 min. It is shown that the elemental composition and structure of the surface layer of the alloy change as the duration of holding in a hydrogen atmosphere increases. Moreover, the contents of oxygen, aluminum, titanium, chromium and niobium become many times higher, and we observe the formation of spherical nickel microparticles 0.5 – 3.0 μm in size. The composition of the internal layers of VV751P alloy varies insignificantly, which reveals the inhibition of the process of oxidation in the outer layer and the absence of penetration of the oxidation front into the alloy.</p>

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Effect of the Duration of High-Temperature Exposure to Hydrogen on the Chemical Compositions of the Surface and Inner Layers of VV751P Nickel Alloy

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • V. Z. Poylov,
  • A. L. Kazantsev,
  • D. D. Fomina,
  • P. V. Skovorodnikov

摘要

We study the effect of duration of the exposure to hydrogen on the chemical compositions of the surface and inner layers of BB751P heat-resistant nickel alloy applied for manufacturing of the disks of aircraft engines. The samples were treated in a hydrogen atmosphere at 1473 K for 0, 15, 30 and 60 min. It is shown that the elemental composition and structure of the surface layer of the alloy change as the duration of holding in a hydrogen atmosphere increases. Moreover, the contents of oxygen, aluminum, titanium, chromium and niobium become many times higher, and we observe the formation of spherical nickel microparticles 0.5 – 3.0 μm in size. The composition of the internal layers of VV751P alloy varies insignificantly, which reveals the inhibition of the process of oxidation in the outer layer and the absence of penetration of the oxidation front into the alloy.