Modeling of microporosity, macroporosity, and pipe-shrinkage formation during the solidification of alloys using a mushy-zone refinement method: Applications to aluminum alloys

A microporisity model, based on the solution of Darcy's equation and microsegregation of gas, has been developed for arbitrary two- (2D) and three-dimensional (3D) geometry and coupled for the first time with macroporosity and pipe-shrinkage predictions. In order to accurately calculate the pre...

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Veröffentlicht in:	Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2002-07, Vol.33 (7), p.2095-2106
Hauptverfasser:	PEQUET, Ch, GREMAUD, M, RAPPAZ, M
Format:	Artikel
Sprache:	eng
Schlagworte:	Alloys Aluminum Aluminum base alloys Applied sciences Boundary conditions Casting Copper Cross-disciplinary physics: materials science rheology Exact sciences and technology Finite element method Fluid dynamics Fluid flow Free surfaces Heat transmission Macroporosity Mass balance Materials science Metallurgy Metals. Metallurgy Microporosity Mushy zones Phase diagrams and microstructures developed by solidification and solid-solid phase transformations Physics Pipes Pressure drop Shrinkage Silicon Solidification
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Zusammenfassung:	A microporisity model, based on the solution of Darcy's equation and microsegregation of gas, has been developed for arbitrary two- (2D) and three-dimensional (3D) geometry and coupled for the first time with macroporosity and pipe-shrinkage predictions. In order to accurately calculate the pressure drop within the mushy zone, a dynamic refinement technique has been implemented: a fine and regular finite volume (FV) grid is superimposed onto the finite-element (FE) mesh used for the heat-flow computations.
ISSN:	1073-5623 1543-1940
DOI:	10.1007/s11661-002-0041-5