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TitleLow pressure sand casting of ultrasonically degassed AlSi7Mg0.3 alloy: Modelling and experimental validation of mould filling
Author(s)Puga, Hélder
Barbosa, J.
Azevedo, T.
Ribeiro, S.
Alves, J. L.
Ultrasonic degassing
Low pressure sand casting
Mechanical properties
Issue date15-Mar-2016
PublisherElsevier Science Ltd
JournalMaterials & Design
Abstract(s)The effect of combining smooth mould cavity filling and ultrasonic degassing by using a low pressure sand casting process with US melt treatment on the microstructure and mechanical properties of AlSi7Mg0.3 alloy was investigated. Computational fluid dynamics (CFD) modelling and experimental validation was used to study the liquid metal flow behaviour and oxide film defect distribution for different filling rates, using two pressurization curves (p-t). The effect of ultrasonic degassing on the resultant microstructure (morphology and presence of porosities and inclusions) was studied for 650 and 700 degrees C melt degassing temperatures. Results show that ultrasonic degassing and mould filling velocities below 0.5 m/s improve the alloy microstructure and lead to high mechanical properties.
AccessOpen access
Appears in Collections:DEM - Artigos em revistas de circulação internacional com arbitragem científica

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