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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
Article

Abstract

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.

Keywords

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.

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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

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