Publications
Microsegregation and secondary phase formation during directional solidification of the single-crystal Ni based superalloy LEK94
I. Lopez-Galilea, S. Huth, S. G. Fries, N. Warnken, I. Steinbach, W. Theisen.
Metallurgical and Materials Transactions A, 43, 5153–5164, (2012)
Abstract
A multicomponent phase-field method coupled to thermodynamic calculations according to the
CALPHAD method was used to simulate microstructural evolution during directional solidi-
fication of the LEK94 commercial single-crystal Ni-based superalloy using a two-dimensional
unit cell approximation. We demonstrate quantitative agreement of calculated microsegregation
profiles and profiles determined from casting experiments as well as calculated fraction solid
curves with those determined in differential thermal analysis (DTA) measurements. Finally, the
role of solidification rate on dendrite morphology and precipitation of the secondary phases is
investigated and a new measure of the dendrite morphology is presented to quantify the effect of
back diffusion on the amount of secondary phases.
DOI: 10.1007/s11661-012-1327-x
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