Advertisement

Metallurgical and Materials Transactions A

, Volume 43, Issue 1, pp 10–19 | Cite as

Discontinuous Precipitation and Phase Stability In Re- and Ru-Containing Nickel-Base Superalloys

  • Astrid Heckl
  • Samir Cenanovic
  • Mathias Göken
  • Robert F. Singer
Article

Abstract

The phase stability of nickel-base superalloys has been investigated using a new in-house-designed alloy series with stepwise increased additions of Re and Ru at otherwise fixed atomic fractions of alloying elements. Results presented in this study are focused on the lesser-known topologically closed packed (TCP) formation of columnar colonies or so-called discontinuous precipitation. A detailed investigation of these colonies allowed for identifying compositional changes during the growth process and for providing a three-dimensional (3-D) illustration of the TCP phases within these colonies. The results were used to compare the colony growth process with existing growth models. Furthermore, the influence of Re and Ru on the appearance of discontinuous precipitation has been investigated by means of colony width and the effect on creep properties. Larson-Miller plots are given to illustrate the creep strength of directionally solidified samples with and without TCP colonies compared with single crystalline samples free from TCP colonies.

Keywords

Creep Strength Reaction Front Discontinuous Precipitation Directionally Solidify Topologically Close Packed 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work was financially supported by the German Research Foundation (DFG) in the framework of the DFG research group (Graduiertenkolleg) 1229 “Stable and Metastable Multiphase Systems for High Temperature Applications.” We would like to thank Karl Nigge for measurements with the EPMA.

References

  1. 1.
    R.C. Reed: The Superalloys, Cambridge University Press, Cambridge, UK, 2006.CrossRefGoogle Scholar
  2. 2.
    G.L. Erickson: Superalloys, TMS, Warrendale, PA, 1996, pp. 35-44.Google Scholar
  3. 3.
    A.D. Cetel and D.N. Duhl: Superalloys, TMS, Warrendale, PA, 1988, pp. 235-44.Google Scholar
  4. 4.
    R. Darolia, D.F. Lahrman, and R.D. Field: Superalloys, TMS, Warrendale, PA, 1988, pp. 255-64.Google Scholar
  5. 5.
    K. O’Hara, S. Walston, E. Ross, and R. Darolia: Patent No. 5.482.789. 176.613. 1996.Google Scholar
  6. 6.
    C.M.F. Rae and R.C. Reed: Acta Mater., 2001, vol. 49, pp. 4113-25.CrossRefGoogle Scholar
  7. 7.
    C.M.F. Rae and R.C. Reed: Superalloys, TMS, Warrendale, PA, 2000, pp. 767-76.Google Scholar
  8. 8.
    S. Tin, A.C. Yeh, A.P. Ofori, R.C. Reed, and S.S. Babu: Superalloys, TMS, Warrendale, PA, 2004, pp. 735-41.Google Scholar
  9. 9.
    R.A. Hobbs, L. Zhang, C.M.F. Rae, and S. Tin: Mater. Sci. Eng. A, 2008, vol. 489, pp. 65-76.CrossRefGoogle Scholar
  10. 10.
    R.B. Scarlin: Scripta Mater., 1976, vol. 10, pp. 711-15.CrossRefGoogle Scholar
  11. 11.
    T.M. Pollock: Mater. Sci. Eng. B, 1995, vol. 32, no. 3, pp. 255-66.CrossRefGoogle Scholar
  12. 12.
    S. Tin and T.M. Pollock: Mater. Sci. Eng. A, 2003, vol. 348, pp. 111-21.CrossRefGoogle Scholar
  13. 13.
    W.S. Walston, J.C. Schaeffer, and W.H. Murphy: Superalloys, TMS, Warrendale, PA, 1996, pp. 9-17.Google Scholar
  14. 14.
    J.D. Nystrom, T.M. Pollock, W.H. Murphy, and A. Garg: Metall. Mater. Trans. A, 1997, vol. 28A, pp. 2443-52.CrossRefGoogle Scholar
  15. 15.
    R.O. Williams: Trans. TMS-AIME, 1959, vol. 215, pp. 1026-32.Google Scholar
  16. 16.
    K.N. Tu and D. Turnbull: Acta Metall., 1967, vol. 15, pp. 369-76.CrossRefGoogle Scholar
  17. 17.
    I. Manna, S.K. Pabi, and W. Gust: Int. Mater. Rev., 2001, vol. 46, no. 2, pp. 3-91.CrossRefGoogle Scholar
  18. 18.
    A. Heckl, R. Rettig, and R.F. Singer: Mater. Sci. Forum, in press.Google Scholar
  19. 19.
    A. Heckl, R. Rettig, S. Cenanovic, M. Göken, and R.F. Singer: J. Cryst. Growth, 2010, vol. 314, no. 12, pp. 2137-44.CrossRefGoogle Scholar
  20. 20.
    A. Heckl, R. Rettig, and R.F. Singer: Metall. Mater. Trans. A, 2010, vol. 41A, pp. 202-11.CrossRefGoogle Scholar
  21. 21.
    A. Heckl, S. Neumeier, M. Göken, and R.F. Singer: Mater. Sci. Eng. A, in press.Google Scholar
  22. 22.
    R. Rettig, A. Heckl, S. Neumeier, and M. Göken: Def. Diff. Forum, 2009, vols. 289-92, pp. 101–08.Google Scholar
  23. 23.
    R. Rettig, A. Heckl, and R.F. Singer: Mater. Sci. Forum, in press.Google Scholar
  24. 24.
    A. Heckl, S. Neumeier, S. Cenanovic, M. Göken, and R.F. Singer: Acta Mater, in press.Google Scholar
  25. 25.
    M.D. Abramoff, P.J. Magelhaes, and S.J. Ram: Biophoton. Int., 2004, vol. 11, no. 7, pp. 36-42.Google Scholar
  26. 26.
    C. Zener: Trans. AIME, 1946, vol. 167, pp. 550-95.Google Scholar
  27. 27.
    M.S.A. Karunaratne, C.M.F. Rae, and R.C. Reed: Metall. Mater. Trans. A, 2001, vol. 32A, pp. 2409-21.CrossRefGoogle Scholar
  28. 28.
    D.A. Porter and K.E. Easterling: Phase Transformations in Metals and Alloys, 2nd ed. Chapman & Hall, London, UK, 1992.Google Scholar

Copyright information

© The Minerals, Metals & Materials Society and ASM International 2011

Authors and Affiliations

  • Astrid Heckl
    • 1
  • Samir Cenanovic
    • 2
  • Mathias Göken
    • 2
  • Robert F. Singer
    • 1
  1. 1.Institute of Science and Technology of Metals, Department of Materials Science and EngineeringUniversity Erlangen-NurembergErlangenGermany
  2. 2.Institute General Materials Properties, Department of Materials Science and EngineeringUniversity Erlangen-NurembergErlangenGermany

Personalised recommendations