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Indexed by:会议论文

Date of Publication:2010-09-25

Included Journals:EI、CPCI-S、Scopus

Volume:686

Page Number:371-+

Key Words:lost foam casting; thermal analysis; dendrite coherency; solidification behavior; solid fraction

Abstract:The lost foam casting (LFC) process utilizes the expanded polystyrene (EPS) foam pattern for the production of metallic components. The thermal degradation of the foam pattern has a significant effect on microstructure of the component. Dendrite coherency is important for the determination of the formation of the solidification structure and cast ability of alloys. The effects of the dendrite coherency on grain size in Mg-4Al alloy have been studied using the two-thermocouple thermal analysis technique in the solidified sample. The results also indicate that the grain size increases with the temperature interval between liquids (T-N) and dendrite coherency point (T-DCP), The solid fraction at DCP (f(s)(DCP)) expressed in percent strongly dependents on the dendrite morphology during solidification.