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Oxidation and Hot Corrosion Behaviors of Service-Exposed and Heat-Treated Gas Turbine Vanes Made of IN939 Alloy

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Abstract

Oxidation and hot corrosion tests were conducted on service-exposed and heat-treated IN939 alloys at 830, 930 and 1030 °C for testing times up to 800 h. The degradation behaviors were studied using optical and scanning electron microscopes. The oxidation results showed no tangible weight change in the samples at 830 °C. At 930 °C, after initial weight gain, the oxidation samples showed weight loss; whereas a continuous weight loss was observed at the higher temperature of 1030 °C. In the hot corrosion tests, however, a large weight loss occurred in the samples even at 830 °C, indicating an effect of fuel impurities on the high-temperature behavior of the alloy. SEM observations revealed that the main features of oxidation and hot corrosion of the alloy were internal oxidation of aluminum and depletion of chromium in the regions beneath the surface scales.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Engineering, University of Kashan, Kashan, Iran

    M. Abedini

  2. Metallurgy Department, Niroo Research Institute, Tehran, 14686, Iran

    M. R. Jahangiri

  3. Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA

    P. Karimi

Authors
  1. M. Abedini
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  2. M. R. Jahangiri
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  3. P. Karimi
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Correspondence to M. Abedini.

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Abedini, M., Jahangiri, M.R. & Karimi, P. Oxidation and Hot Corrosion Behaviors of Service-Exposed and Heat-Treated Gas Turbine Vanes Made of IN939 Alloy. Oxid Met 90, 469–484 (2018). https://doi.org/10.1007/s11085-018-9847-4

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  • DOI: https://doi.org/10.1007/s11085-018-9847-4

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