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<p>The structure and phase composition of coatings formed on the surface of the CrNi32Ti alloy by the hot-dip aluminizing method with subsequent heat treatment were studied. During aluminizing of the CrNi32Ti alloy, a&#xa0;continuous coating is formed on its surface, consisting of an aluminum matrix with eutectic regions ((Al)+τ<sub>1</sub>(FeNiAl<sub>9</sub>)), large intermetallic inclusions of the H‑(CrFeAl) phase and interlayers of FeNiAl<sub>5</sub> and FeAl<sub>3</sub>(Cr) intermetallic compounds along the substrate interface. The heat treatment of the aluminized CrNi32Ti alloy at 1100 °C ensures the dissolution of aluminum-rich intermetallic compounds and the formation of aluminide (Fe,Ni,Cr)Al in the surface layer. High-temperature oxidation of the resulting coatings is accompanied by the formation of a&#xa0;stable α‑Al<sub>2</sub>O<sub>3</sub> and metastable θ‑Al<sub>2</sub>O<sub>3</sub> phases on their surface.</p>

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Formation of a heat-resistant aluminide coating on CrNi32Ti alloy by hot-dip aluminizing

  • 期刊论文

  • 发表日期：

    2025年8月26日

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

摘要

The structure and phase composition of coatings formed on the surface of the CrNi32Ti alloy by the hot-dip aluminizing method with subsequent heat treatment were studied. During aluminizing of the CrNi32Ti alloy, a continuous coating is formed on its surface, consisting of an aluminum matrix with eutectic regions ((Al)+τ1(FeNiAl9)), large intermetallic inclusions of the H‑(CrFeAl) phase and interlayers of FeNiAl5 and FeAl3(Cr) intermetallic compounds along the substrate interface. The heat treatment of the aluminized CrNi32Ti alloy at 1100 °C ensures the dissolution of aluminum-rich intermetallic compounds and the formation of aluminide (Fe,Ni,Cr)Al in the surface layer. High-temperature oxidation of the resulting coatings is accompanied by the formation of a stable α‑Al2O3 and metastable θ‑Al2O3 phases on their surface.