Interface Morphologies and Microstructure of a Single Crystal Superalloy under High Thermal Gradient Directional Solidification
The interface morphologies single crystal superalloys CMSX-2 has been studied over a range of cooling rate with large variations in withdrawal speed in directional solidification. The superfine cellular structure was obtained under both high thermal gradient up to 1000K/cm and fast withdrawal rate up to 1mm/sec. The high rate directional solidification results in reduction in primary and secondary dendrite arm spacing, refinement of λ’ phase, reduced microsegregation of alloying elements and smaller size of γ-γ’ eutectics.
Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie
L. Liu et al., "Interface Morphologies and Microstructure of a Single Crystal Superalloy under High Thermal Gradient Directional Solidification", Materials Science Forum, Vols. 475-479, pp. 665-668, 2005