A solidification model for prediction of castability in the precipitation-strengthened nickel-based superalloys
作者： Homam Naffakh Moosavy , Mohammad-Reza Aboutalebi , Seyed Hossein Seyedein , Carlo Mapelli
DOI: 10.1016/J.JMATPROTEC.2013.04.019
关键词: Metallurgy 、 Scanning electron microscope 、 Precipitation (chemistry) 、 Atmospheric temperature range 、 Chemical composition 、 Eutectic system 、 Castability 、 Materials science 、 Superalloy 、 Vacuum induction melting
摘要: Abstract The Scheil equation was used to model the solidification path, microsegregation of alloying elements in interdendritic regions, temperature ranges, and predict formation secondary structures castability behavior as-cast superalloys. 4 experimental alloys with pre-specified γ-Ti,Nb,Al,Mo composition containing different Nb, Ti Al contents were designed using vacuum induction melting furnace. produced superalloys characterized optical scanning electron microscopy equipped energy dispersive X-ray spectrometer TG–DSC analysis. experiments showed logic conformity modeling results. experiment confirmed highest segregation for Nb. All indicated remarkable tendency form eutectic at last stages solidification. Superalloy chemical γ-3.5%Mo,1.8%Al,4%Ti,2.9%Nb shorter range best castability.
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