Journal of Failure Analysis and Prevention

, Volume 17, Issue 3, pp 529–538 | Cite as

Creep Life Degradation and Microstructure Degeneration in a Low-Pressure Turbine Blade of a Military Aircraft Engine

  • Benudhar Sahoo
  • S. K. Panigrahi
  • R. K. Satpathy
Technical Article---Peer-Reviewed
First Online:
Received:
Revised:
  • 173 Downloads

Abstract

Military aircraft engines operate under arduous environmental conditions with rapid throttle excursions as a part of its mission requirements. Life of an aircraft engine particularly of a military class is limited by the longevity of hot end components. Total technical life of a gas turbine component is dictated by the bulk properties while time between overhaul is decided by the aero-thermal degradation which in turn is influenced by the surface protective coating. In the present research, stress rupture tests were carried out to evaluate the creep life of blades while swelling of the coating and secondary reaction zone (SRZ) were evaluated to assess the coating damage. Further, an investigation was made to assess the degradation in creep life and microstructure degeneration during the service period when turbine blades made of wrought nickel-based alloy is provided with aluminide coating. Minimum creep rate and time to rupture are used as the characteristic parameters to evaluate the degradation in creep life. Coarsening of gamma prime (γ′) and degeneration of carbides was evaluated for microstructure degeneration in the bulk material. Degradation in coating life was evaluated by volume fraction of β-phase and development of SRZ in the coating.

Keywords

Aluminide coating Creep life Gamma Microstructure degeneration Secondary reaction zone 
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Notes

Acknowledgments

The support rendered by DMRL, Hyderabad, and NML, Jamshedpur, during experimental investigation is duly acknowledged. The encouragement from Shri P Jayapal, Chief Executive, and guidance from Shri G Gouda, Group Director (Propulsion), CEMILAC, Bengaluru, is sincerely acknowledged. Sparing of few turbine blades by HAL, Koraput, for the study is sincerely acknowledged.

References

  1. 1.
    R.C. Reed, The physical metallurgy of nickel and its alloys. The Superalloys: Fundamentals and Application, Chapter-1 (Cambridge University Press, 2006), pp. 2–3Google Scholar
  2. 2.
    Y. Tamerin, Protective Coating for Turbine Blades (ASM Publication, Materials Park, 2002), pp. 1–3Google Scholar
  3. 3.
    C.T. Sims, W.C. Hagel, Coatings on nickel base superalloys. The Super Alloys (Wiley, 1972), pp. 174–176Google Scholar
  4. 4.
    M.J. Donachie, S.S. Donachie, Superalloys: A Technical Guide, Chapter-3 (ASM International, 2002), pp. 31–32Google Scholar
  5. 5.
    T.M. Pollock, Nickel based superalloys for advanced turbine engines. J. Propuls. Power 22(2), 3–4, 361–374 (2006)Google Scholar
  6. 6.
    R.C. Reed, The physical metallurgy of nickel and its alloys. The Superalloys: Fundamentals and Application, Chapter-1 (Cambridge University Press, 2006), pp. 14–17Google Scholar
  7. 7.
    G. Marahleh, A.R.I. Kheder, H.F. Hammand, Creep life prediction of service exposed turbine blades. Mater. Sci. 42(4), 476–481 (2006)CrossRefGoogle Scholar
  8. 8.
    M.R. Jahangiri, M. Abedini, Effect of long service exposure on microstructure and mechanical properties of gas turbine vanes made of IN939 alloy. Mater. Des. 64, 588–600 (2014)CrossRefGoogle Scholar
  9. 9.
    M. Sujata, M. Madan, K. Raghavendra, M.A. Venkataswamy, S.K. Bhaumik, Microstructural study: an aid to determination of failure mechanism in nickel base superalloy blades. Trans. Indian Inst. Met. 61(2–3), 681–685 (2010)CrossRefGoogle Scholar
  10. 10.
    S.-A. Karlson, C. Persson, P.-O. Persson, Metallographic approaches to hirbine blade life time prediction. Mater. Manuf. Process. 10(5), 939–953 (1995)CrossRefGoogle Scholar
  11. 11.
    R. Rajendran, M.D. Ganeshachar, T. Mohan Rao, Condition assessment of gas turbine blade and coating. Eng. Fail. Anal. 18, 2104–2110 (2011)CrossRefGoogle Scholar
  12. 12.
    H.M. Tawancy, L.M. Al-Hadhrami, Comparative performance of turbine blades used in power generation: damage vs. microstructure and superalloy composition selected for the application. Eng. Fail. Anal. 46, 76–91 (2014)CrossRefGoogle Scholar
  13. 13.
    J.Y. Ting, X.F. Ding, Y.R. Zheng, K. Yagi, Q. Feng, Evaluation of a serviced turbine blade made of GH4033 wrought super alloy. Mater. Sci. Eng. A 618, 605–613 (2014)CrossRefGoogle Scholar
  14. 14.
    F.R.N. Nabarro, Rafting in superalloys. Metall. Mater. Trans. A 27A(3), 513–530 (1996)CrossRefGoogle Scholar
  15. 15.
    D.K. Das, K.S. Murphy, S. Ma, T.M. Pollock, Formation of secondary reaction zone in diffusion-aluminide coated Ni-base single crystal superalloys containing Ruthenium. Metall. Mater. Trans. A 39A(7), 1647–1657 (2008)CrossRefGoogle Scholar
  16. 16.
    W.S. Walston, J.C. Schaeffer, W.H. Murphy, A new type of microstructural instability in superalloys-SRZ, Superalloys, TMS (1996), pp. 9–18Google Scholar
  17. 17.
    R. Darolia, D.F. Lahrman, R.D. Field, Formation of topologically closed packed phases in nickel base single crystal super alloys, Superalloys, TMS (1988), pp. 255–264Google Scholar
  18. 18.
    B.A. Cowels, High cycle in aircraft gas turbines—an industry perspective. Int. J. Fract. 80, 147–163 (1966)CrossRefGoogle Scholar
  19. 19.
    Z. Huda, Metallurgical failure analysis for a failed blade in a gas turbine engine of a power plant. Mater. Des. 30, 3121–3125 (2009)CrossRefGoogle Scholar
  20. 20.
    R.K. Mishra, N. Vaishakhi, T. Johney, K. Srinivasan, B. Raghavendra, Failure analysis of HP turbine blades in a low bypass turbofan engine. J. Fail. Anal. Prev. 13, 274–281 (2013)CrossRefGoogle Scholar
  21. 21.
    F. Gabrieli, V. Lupnic, in Strenght of Metals and Alloys, ed. by Giblins, ICSMA(6) (Pergamon Press, Oxford, 1982), pp. 607–612Google Scholar
  22. 22.
    C.T. Sims, N.S. Stoloff, W.C. Wagel, Superalloys (Wiley, New York, 1987)Google Scholar

Copyright information

© ASM International 2017

Authors and Affiliations

  • Benudhar Sahoo
    • 1
  • S. K. Panigrahi
    • 1
  • R. K. Satpathy
    • 1
  1. 1.Department of Mechanical EngineeringDefence Institute of Advanced Technology (Deemed University)Girinagar, PuneIndia

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