Advertisement

JOM

, Volume 56, Issue 9, pp 44–48 | Cite as

The segregation of elements in high-refractory-content single-crystal nickel-based superalloys

  • E. C. Caldwell
  • F. J. Fela
  • G. E. Fuchs
Research Summary Solidification In Ni-Based Superalloys

Abstract

Nickel-based superalloys are complex alloys that contain ten to 15 elements that are widely used in industries where high-temperature strength and corrosion resistance are required. Alloy additions commonly include Cr, Co, W, Ta, Al, Ti, Re, Mo, and, in some alloys, Ru. Each of these additions can affect the as-cast microstructure due to differences in elemental segregation. A better understanding of the effects of typical additions to nickel-based superalloys on the segregation of the elements in the alloy can help identify potential improvements in the processing of current alloys and the development of new alloys. Therefore, the effects of several common alloying additions on solidification segregation and defects were evaluated. In general, an increase in the degree of elemental segregation was observed with increases in each of the elements listed except cobalt and molybdenum. Increased levels of cobalt and molybdenum resulted in reductions in the segregation of most of the elements in the alloy.

Keywords

Ruthenium Rhenium Chromium Content Interdendritic Region Segregation Behavior 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    ASM Specialty Handbook: Heat Resistant Materials, ed. J.R. Davis (Materials Park, OH: ASM International, 1997), pp. 255–271.Google Scholar
  2. 2.
    C.T. Sims, Superalloys II, ed. C. Sims, N. Stoloff, and W. Hagel (New York: J. Wiley and Sons, 1987), pp. 3–26.Google Scholar
  3. 3.
    W.S. Walston et al., Superalloys 1996, ed. R.D. Kissinger et al. (Warrendale, PA: TMS, 1996), pp. 27–34.Google Scholar
  4. 4.
    F.J. Fela, (Master’s Thesis, University of Florida, May 2000).Google Scholar
  5. 5.
    P. Caron, Materials Design Approaches and Experiences, ed. J.-C. Zhao, M. Fahrmann, and T.M. Pollock (Warrendale, PA: TMS, 2001), pp. 1–14.Google Scholar
  6. 6.
    M. Durand-Charee, The Microstructure of Superalloys (Toronto, Canada: Gordon and Breach Science Publishers, 1997), pp. 60–69.Google Scholar
  7. 7.
    T.M. Pollocketal., Superalloys 1992, ed. S.D. Antolovich et al. (Warrendale, PA: TMS, 1992), pp. 125–134.Google Scholar
  8. 8.
    M. Gell et al., Journal of Metals, 39 (7) (1987), pp. 11–15.Google Scholar
  9. 9.
    A. Willis and D. McCartney, Mater. Sci. & Eng., A145 (2) (1991), pp. 223–232.CrossRefGoogle Scholar
  10. 10.
    P. Caron and T. Kahn, J. of Mater. Sci & Eng., 61 (1983), pp. 173–176.CrossRefGoogle Scholar
  11. 11.
    G.E. Fuchs, J. of Mater. Eng. and Pref., 11 (2002), pp. 19–25.CrossRefGoogle Scholar
  12. 12.
    M.N. Gungor, Metall. Trans. A, 20A (1989), pp. 2529–2533.Google Scholar
  13. 13.
    K.A. Al-Jarba and G.E. Fuchs, Mater. Sci. and Eng., A373 (2004), pp. 255–267.CrossRefGoogle Scholar
  14. 14.
    G.E. Fuchs, J. of Mater. Sci. & Eng., Vol. 300 (2001) pp. 52–60.CrossRefGoogle Scholar
  15. 15.
    T.M. Pollock and W.H. Murphy, Metall. Trans A, 27A (1996) pp. 1081–1089.Google Scholar
  16. 16.
    “Phase Diagrams,” ASM Handbook, Vol. 3, 10th Edition, (Metals Park, OH: ASM International, 1991).Google Scholar

Copyright information

© TMS 2004

Authors and Affiliations

  • E. C. Caldwell
    • 1
  • F. J. Fela
    • 1
  • G. E. Fuchs
    • 1
  1. 1.the Department of Materials Science and Engineering at the University of FloridaGainesville

Personalised recommendations