Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1653089 | Materials Letters | 2007 | 4 Pages |
Abstract
The interface morphologies of single crystal superalloy CMSX-2 were studied over a range of cooling rate with large variations in withdrawal speeds in directional solidification. A superfine cellular structure was obtained under both high thermal gradient up to 1000 K/cm and fast withdrawal rate up to 1 mm/s. The high rate directional solidification results in reduction in primary and secondary dendrite arm spacing, refinement of γⲠphase, reduced microsegregation of alloying elements and smaller size of γ-γⲠeutectics. The rupture life and plasticity of fine structure samples produced in high thermal gradient directional solidification increase significantly than that in conventional directional solidification process at 1323 K.
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Authors
L. Liu, T.W. Huang, J. Zhang, H.Z. Fu,