Abstract
Dendritic segregation of directionally solidified columnar and single crystal CMSX-4® superalloy in as-cast and heat-treated condition was investigated. The partition coefficients of alloying elements derived from EDS measurements for various secondary dendrite arm spacings (SDAS) exhibited strong segregation in the dendrite cores (Re, W) or in the interdendritic regions (Al, Ti, Ta). Titanium segregation is more sensitive to the SDAS than that of the other elements. In the final stages of the interdendritic solidification chromium has a tendency to accumulate in a supersaturated γ phase layer around the coarse gamma prime islands.
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