Cyclic oxidation behavior of uncoated and aluminum-rich nickel aluminide coated Rene-80 superalloy

Document Type : Original Research Article

Authors

1 Ceramic Division, Materials and Energy Research Center, Karaj, P.O. Box 31787-316, Iran

2 Department of Advanced Materials and New Energies, Iranian Research Organization for Science and Technology (IROST), Tehran 15815-3538, Iran

Abstract

In this study, aluminide coating was employed to enhance the high-temperature cyclic oxidation of Rene-80 superalloy at 950ºC. The microstructural aspects and phase constituents of samples were  investigated with scanning electron microscopy (SEM) and x-ray diffraction (XRD) techniques. The result of oxidation tests showed that the weight gain in the uncoated sample was considerably higher than the aluminide coated sample, which indicates the higher rate of oxide formation on the uncoated surface. With the aid of microstructural and XRD analysis, it was confirmed that with the increment of oxidation cycles, the thickness of aluminide coating reduced and the protective β-NiAl phase was converted to alumina scales. According to the EDS results taken from the top coat, it was found that with the increase of oxidation cycles, the content of aluminium in the top layer was drastically decreased and the weight percentage of oxygen was considerably enhanced. Also, in higher oxidation cycles, other protective elements such as Cr and Ti outwardly diffused from the inter-diffusion zone (IDZ) layer which led to reduction in the content of these elements in inner zones of the aluminide coating.
 

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References

  1. Reed, R.C., “The superalloys: fundamentals and applications”, Cambridge university press, (2008).
  2. Farvizi, M., Asgari, S., “Effects of cold work prior to aging on microstructure of AEREX™ 350 superalloy”, Materials Science and Engineering: A, Vol. 480, No. 1-2, (2008), 434-438.
  3. Davis, J. R., “ASM specialty handbook: heat-resistant materials”, ASM International, (1997).
  4. Latief, F.H., Sherif, E.S.M., Kakehi, K., “Role of aluminide coating on oxidation resistance of Ni-based single crystal superalloy at 900 C”, International Journal of Electrochemical Science, vol. 10, (2015), 1873–1882.
  5. Sims, C. T., Stoloff, N. S., Hagel, W. C., eds., superalloys II”, Wiley New York, (1987).
  6. R. Bianco and R. A. Rapp, “Pack cementation aluminide coatings on superalloys: codeposition of Cr and reactive elements”, Journal of the Electrochemical Society, vol. 140, No. 4, (1993), 1181–1190.
  7. Pichoir, R., “Influence of the Mode of Formation on the Oxidation and Corrosion Behaviour of NiAl-type Protective Coatings”, in D.R. Holmes and A. Rahmel, Materials and Coatings to Resist High Temperature Corrosion (Applied Science Publication LTD.) (1978), 271–291.
  8. Warnes, B. M., “Improved aluminide/MCrAlX coating systems for super alloys using CVD low activity aluminizing”, Surface and Coatings Technology, vol. 163, (2003), 106–111.
  9. Goward, G. W., Boone, D. H., “Mechanisms of formation of diffusion aluminide coatings on nickel-base superalloys”, Oxidation of Metals, Vol. 3, No. 5, (1971), 475–495.
  10. Lee, J.-W., Kuo, Y.-C., “Cyclic oxidation behavior of a cobalt aluminide coating on Co-base superalloy AMS 5608”, Surface and Coatings Technology, Vol. 200, No. 5–6, (2005), 1225–1230.
  11. Kung, S. C., Rapp, R. A., “Kinetic study of aluminization of iron by using the pack cementation technique”, Journal of the Electrochemical Society, Vol. 135, No. 3, (1988), 731–741.
  12. Duret, C., Pichoir, R., “Protective Coatings for High-Temperature Materials: Chemical Vapor Deposition and Pack Cementation Processes”, Coatings High-Temperature Applications, (1983), 33–78.
  13. Galetz, M.C., Montero, X., Mollard, M., Günthner, M., Pedraza, F., Schütze, M., “The role of combustion synthesis in the formation of slurry aluminization”, Intermetallics, Vol. 44, (2014), 8–17.
  14. Firouzi, A., Shirvani, K., “The structure and high temperature corrosion performance of medium-thickness aluminide coatings on nickel-based superalloy GTD-111”, Corrosion Science, Vol. 52, No. 11, (2010), 3579–3585.
  15. Pineau, A., Antolovich, S. D., “High temperature fatigue of nickel-base superalloys–a review with special emphasis on deformation modes and oxidation”, Engineering Failure Analysis, Vol. 16, No. 8, (2009), 2668–2697.
  16. Shirvani, K., Firouzi, S., Rashidghamat, A., “Microstructures and cyclic oxidation behaviour of Pt-free and low-Pt NiAl coatings on the Ni-base superalloy Rene-80”, Corrosion Science, Vol. 55, (2012), 378–384.
  17. Das, D. K., Joshi, S. V, Singh, V., “Evolution of aluminide coating microstructure on nickel-base cast superalloy CM-247 in a single-step high-activity aluminizing process”, Metallurgical and Materials Transactions. A, Vol. 29, No. 8, (1998), 2173–2188.
  18. Nowotnik, A., Sieniawski, J., Góral, M., Pytel, M., Dychton, K., “Microstructure and kinetic growth of aluminide coatings deposited by the CVD method on Re 80 superalloy”, Archives of Materials Science and Engineering, Vol. 55, No. 1, (2012), 22–28.
  19. Zielińska, M., Zagula-Yavorska, M., Sieniawski, J., Filip, R., “Microstructure and oxidation resistance of an aluminide coating on the nickel based superalloy Mar M247 deposited by the CVD aluminizing process”, Archives of Metallurgy and Materials, Vol. 58, No. 3, (2013), 697–701.
  20. Latief, F. H., Kakehi, K., Tashiro, Y., “Oxidation behavior characteristics of an aluminized Ni-based single crystal superalloy CM186LC between 900 C and 1100 C in air”, Journal of Industrial and Engineering Chemistry, Vol. 19, No. 6, (2013), 1926–1932.

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History

  • Receive Date: 06 February 2019
  • Revise Date: 20 June 2019
  • Accept Date: 25 June 2019

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