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<p>The structure and phase composition of coatings formed on the surface of the CrNi50WMoTiAlNb alloy by hot dip aluminizing with subsequent heat treatment were studied. Aluminizing of the CrNi50WMoTiAlNb alloy allows forming a&#xa0;continuous coating with a&#xa0;clearly distinguishable layered structure, in which the upper layer is represented by Al with eutectic inclusions, the middle layer consists of a&#xa0;mixture of Al and intermetallics (CrAl<sub>7</sub> and <i>k</i>-Al76Cr18Ni6), and a&#xa0;thin boundary layer has the following structure: φ‑Al77.5Cr12.5Ni10 + <i>k</i>-Al76Cr18Ni6/φ-Al77.5Cr12.5Ni10/Ni<sub>2</sub>Al<sub>3</sub>(Cr). Heat treatment of the aluminized CrNi50WMoTiAlNb alloy at 1100 °C leads to the formation of an intermetallic coating due to the diffusion-driven redistribution of chemical elements.</p>

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Formation of aluminide coating structure on the CrNi50WMoTiAlNb alloy surface during liquid aluminizing

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • V. P. Kulevich,
  • A. I. Bogdanov,
  • V. G. Shmorgun,
  • S. A. Kuznetsov

摘要

The structure and phase composition of coatings formed on the surface of the CrNi50WMoTiAlNb alloy by hot dip aluminizing with subsequent heat treatment were studied. Aluminizing of the CrNi50WMoTiAlNb alloy allows forming a continuous coating with a clearly distinguishable layered structure, in which the upper layer is represented by Al with eutectic inclusions, the middle layer consists of a mixture of Al and intermetallics (CrAl7 and k-Al76Cr18Ni6), and a thin boundary layer has the following structure: φ‑Al77.5Cr12.5Ni10 + k-Al76Cr18Ni6/φ-Al77.5Cr12.5Ni10/Ni2Al3(Cr). Heat treatment of the aluminized CrNi50WMoTiAlNb alloy at 1100 °C leads to the formation of an intermetallic coating due to the diffusion-driven redistribution of chemical elements.