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Undercooling Related Casting Defects in Single …
Undercooling Related Casting Defects IN Single CRYSTAL TURBINE BLADES M. Meyer ter Vehn, D. Dedecke, U. Paul* and Sahm GieBerei-Institut, RWTH Aachen, Intzestr. 5, 52056 Aachen, Germany * now at: Siemens KWU, Wiesenstr. 35,45473 MtilheimlRuhr, Germany Abstract During the Single crystal solidification of turbine blades Casting Defects such as stray grains are often formed in the inner and outer shroud due to a curvature of the liquidus iso- therm and a resulting thermal Undercooling of the melt. An intensive study of the thermal conditions in typical shroud regions for two different blade geometries was carried out using macroscopic solidification modeling and temperature measurements during Casting experiments.
UNDERCOOLING RELATED CASTING DEFECTS IN SINGLE CRYSTAL TURBINE BLADES M. Meyer ter Vehn, D. Dedecke, U. Paul* and P.R. Sahm GieBerei-Institut, RWTH Aachen, Intzestr.
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