Effect of Solidification Condition and Carbon Content on the Morphology of MC Carbide in Directionally Solidified Nickel-base Superalloys

doi:10.1016/j.jmst.2014.06.010

Abstract

Abstract: Evolution of the morphology of MC carbides with the change of cooling rate and carbon content in two kinds of nickel-base superalloys, K417G and DD33, has been investigated. The morphology of MC carbides evolves from faceted to script-like with increasing cooling rate. Varying the carbon content from 40 × 10^-6 to 320 × 10^-6, the morphology of carbides changes from blocky, rod-like into script-like. Scanning electron microscopy observation of deep-etched samples indicates that these carbides evolve from octahedral to dendritic and then into well-developed dendrites accordingly in a three-dimensional manner. The morphology evolution is discussed from the viewpoint of the preferential growth orientation of fcc crystals and the carbide growth rate during directional solidification.

Key words: Carbides morphology, Directional solidification, Three-dimensional microstructure, Nickel-base superalloys

X.W. Li, L. Wang, J.S. Dong, L.H. Lou. Effect of Solidification Condition and Carbon Content on the Morphology of MC Carbide in Directionally Solidified Nickel-base Superalloys[J]. J. Mater. Sci. Technol., 2014, 30(12): 1296-1300.

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