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Cyclic Oxidation and Hot Corrosion Behaviors of Gradient CoNiCrAlYSi Coatings Produced by HVOF and Diffusional Processes

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Abstract

Conventional and gradient CoNiCrAlYSi coatings were produced using high-velocity oxy-fuel (HVOF) and an additional step of diffusional over aluminizing (pack cementation) techniques on the Inconel-738 substrate. Hot corrosion and cyclic oxidation performance of the conventional and the gradient coatings were investigated by exposing samples to a molten salt of Na2SO4–20 % wt. NaVO3 at 880 °C and 1-h exposure at 1100 °C in air. Corrosion and cyclic oxidation rates were determined by measuring the weight gain at regular time intervals. X-ray diffraction, field emission scanning electron microscopy, and electron probe microanalysis techniques were used to characterize the coatings and the thermally grown oxide. Increase in the amount of β aluminum-rich phase and the formation of high-chromium layer beneath the outer aluminum-rich layer and the low surface roughness of gradient coating increased the hot corrosion and oxidation resistance by a factor of 1.7. In addition, the gradient coating showed better rehealing of the thermally formed alumina scale due to its possession of more β phase as a Al reservoir.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Shahrood University of Technology, Shahrood, Iran

    Majid Mohammadi

  2. Department of Materials Science and Engineering, Shiraz University, Shiraz, Iran

    Sirus Javadpour & Seyed Ahmad Jenabali Jahromi

  3. Joining & Welding Res. Inst., Osaka University, Ibaraki, Osaka, 567-0047, Japan

    Akira Kobayashi

Authors
  1. Majid Mohammadi
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  2. Sirus Javadpour
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  3. Seyed Ahmad Jenabali Jahromi
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  4. Akira Kobayashi
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Correspondence to Majid Mohammadi.

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Mohammadi, M., Javadpour, S., Jahromi, S. et al. Cyclic Oxidation and Hot Corrosion Behaviors of Gradient CoNiCrAlYSi Coatings Produced by HVOF and Diffusional Processes. Oxid Met 86, 221–238 (2016). https://doi.org/10.1007/s11085-016-9633-0

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  • DOI: https://doi.org/10.1007/s11085-016-9633-0

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