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<p>The hot corrosion behavior of W-containing and Mo-containing nickel-based superalloys was studied in air (1&#xa0;atm.) in the presence of a sodium sulfate (Na<sub>2</sub>SO<sub>4</sub>) deposit at different temperatures for 24&#xa0;hours. <i>In-situ</i> high-temperature XRD analyses reveal that the Cr and Co contents are a determining factor for the corrosion resistance of these materials. Indeed, the higher content of Cr and Co in Rene 77 promotes the formation of non-protective spinels of (Ni,Co)Cr<sub>2</sub>O<sub>4</sub>, whereas DS200 + Hf primarily leads to the formation of a protective oxide (Cr<sub>2</sub>O<sub>3</sub>). The increase of temperature and the chemical effect imparted by Mo and by W in, respectively, Rene 77 and DS200 + Hf alloys, strongly contribute to the acceleration of degradation, beyond the effects related to the microstructure. We demonstrate that the formation of Ni<sub>1−x</sub>Co<sub>x</sub>(W,Mo)O<sub>4</sub> spinels typical of acidic fluxing is favored by the presence of W in DS200 + Hf and of Mo in Rene 77, in addition to oxidation-sulfidation phenomena.</p>

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Effect of W and Mo on the Hot Corrosion Behavior of Ni-Based Superalloys

  • 期刊论文

  • 发表日期：

    2025年12月27日

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  • Damien Piel,
  • Mathieu Mondet,
  • Sandrine Charles,
  • Maria Juez-Lorenzo,
  • Vladislav Kolarik,
  • Fernando Pedraza

摘要

The hot corrosion behavior of W-containing and Mo-containing nickel-based superalloys was studied in air (1 atm.) in the presence of a sodium sulfate (Na2SO4) deposit at different temperatures for 24 hours. In-situ high-temperature XRD analyses reveal that the Cr and Co contents are a determining factor for the corrosion resistance of these materials. Indeed, the higher content of Cr and Co in Rene 77 promotes the formation of non-protective spinels of (Ni,Co)Cr2O4, whereas DS200 + Hf primarily leads to the formation of a protective oxide (Cr2O3). The increase of temperature and the chemical effect imparted by Mo and by W in, respectively, Rene 77 and DS200 + Hf alloys, strongly contribute to the acceleration of degradation, beyond the effects related to the microstructure. We demonstrate that the formation of Ni1−xCox(W,Mo)O4 spinels typical of acidic fluxing is favored by the presence of W in DS200 + Hf and of Mo in Rene 77, in addition to oxidation-sulfidation phenomena.