Journal of Materials Science

, Volume 29, Issue 14, pp 3637–3642 | Cite as

Solidification morphology and semisolid deformation in the superalloy Rene 108

Part III Equiaxed solidified microstructures
  • C. S. Lin
  • J. A. Sekhar


A high-temperature nickel-base superalloy (Rene 108) was solidified at various cooling rates. The morphology of the equiaxed microstructure and the mechanism for intrinsic microporosity formation were correlated to the processing parameters. A special Gleeble testing procedure (developed previously — where the samples were quickly raised to a predetermined temperature in the semisolid zone and fractured) was used for the measurement of the fracture data. The upper coherent temperature was noted to be a function of the solidification variables. The amount of strain accommodation and the hot-tearing resistance was found to be influenced by the solidification microstructure. The hot ductility, the semisolid strength, and the corresponding microstructural changes are examined and discussed. Fracture maps which include the temperature, transverse-fracture stress and cooling rate during solidification \((T - \sigma _T - \dot T)\) for the equiaxed solidified microstructures are presented. A castability map was created from the fracture data.


Rene Fracture Data Solidification Microstructure Equiaxed Microstructure Predetermined Temperature 
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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Y. F. Guven and J. D. Hunt, Cast Metals 1 (1988), 104.CrossRefGoogle Scholar
  2. 2.
    J. Campbell and T. W. Clyne, ibid. 3 (1991) 224.CrossRefGoogle Scholar
  3. 3.
    C. S. Lin and J. A. Sekhar, J. Mater. Sci. 28 (1993) 3581.CrossRefGoogle Scholar
  4. 4.
    Idem., ibid. 28 (1993) 3885.CrossRefGoogle Scholar
  5. 5.
    J. K. Tien, G. E. Vignoul and M. W. Kopp, Mater. Sci. Engng. A 143 (1991) 43.CrossRefGoogle Scholar
  6. 6.
    V. K. Sikka, J. T. Mavity and K. Anderson ibid. 153 (1992) 712.CrossRefGoogle Scholar
  7. 7.
    J. E. Doherty, B. H. Kear and A. F. Giamei, J. Met. 11 (1971) 59.Google Scholar
  8. 8.
    F. H. Froes, ibid. 9 (1989) 6.Google Scholar
  9. 9.
    J. C. Tsai and J. B. Duh, Scripta Metall. 27 (1992) 561.CrossRefGoogle Scholar
  10. 10.
    C. J. Cheng, PhD Thesis University of Cincinnati, Cincinnati, (1992).Google Scholar
  11. 11.
    J. D. Verhoeven, J. H. Lee, F. C. Laabs and L. L. Jones, J. of Phase Equilibria, in press.Google Scholar
  12. 12.
    C. J. Cheng and J. A. Sekhar, Materials Research Society Conference Proceedings on High Temperature Ordered Intermetallic Alloys IV, edited by L. A. Johnson, D. P. Pope and J. O. Stiegler (Materials Research Society, Pittsburgh, 1991) p. 853.Google Scholar
  13. 13.
    C. T. Ho, C. J. Cheng and J. A. Sekhar, Metall. Trans., A 22 (1991) 225.CrossRefGoogle Scholar
  14. 14.
    C. J. Cheng and J. A. Sekhar, Solidification Microporosity in IC 396M: Nickel Aluminide Vol. 2, Final Report, Equiaxed Solidification (Oak Ridge National Laboratory, Oak Ridge, 1990).Google Scholar
  15. 15.
    J. C. Borland, Brit. Weld J. 7 (1969) 508.Google Scholar
  16. 16.
    Idem, Welding and Metal Fabrication, January/February (1979) 19.Google Scholar
  17. 17.
    Idem., ibid. March (1979) 99.Google Scholar
  18. 18.
    J. A. Sekhar, C. S. Lin and C. J. Cheng, “Nature and properties of semi-solid materials”, edited by J. A. Sekhar and J. Dantzig (The Minerals, Metals and Materials Society, Warrendale, PA, 1991) 267.Google Scholar
  19. 19.
    M. C. Flemings, “Solidification processing” (McGraw-Hill, New York 1974).CrossRefGoogle Scholar
  20. 20.
    A. Etienne and A. Palmers, “Solidification and casting of metal” (The Metals Society, London 1979) 295.Google Scholar
  21. 21.
    A. Grill, J. K. Brimacombe and F. Weinberg, J.I.S.I. 211 (1976) 34.Google Scholar
  22. 22.
    J. Mathew and H. D. Brody, “Solidification and casting of metal” (The Metals Society, London, 1979) p. 244.Google Scholar

Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • C. S. Lin
    • 1
  • J. A. Sekhar
    • 1
  1. 1.Department of Materials Science and Engineering, International Center for MicropyreticsUniversity of CincinnatiCincinnatiUSA

Personalised recommendations