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  4. Three-dimensional granular model of semi-solid metallic alloys undergoing solidification: Fluid flow and localization of feeding
 
research article

Three-dimensional granular model of semi-solid metallic alloys undergoing solidification: Fluid flow and localization of feeding

Sistaninia, M.
•
Phillion, A. B.
•
Drezet, J.-M.  
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2012
Acta Materialia

A three-dimensional (3-D) granular model which simulates fluid flow within solidifying alloys with a globular microstructure, such as that found in grain refined Al alloys, is presented. The model geometry within a representative volume element (RVE) consists of a set of prismatic triangular elements representing the intergranular liquid channels. The pressure field within the liquid channels is calculated using a finite elements (FEs) method assuming a Poiseuille flow within each channel and flow conservation at triple lines. The fluid flow is induced by solidification shrinkage and openings at grain boundaries due to deformation of the coherent solid. The granular model predictions are validated against bulk data calculated with averaging techniques. The results show that a fluid flow simulation of globular semi-solid materials is able to reproduce both a map of the 3-D intergranular pressure and the localization of feeding within the mushy zone. A new hot cracking sensitivity coefficient is then proposed. Based on a mass balance performed over a solidifying isothermal volume element, this coefficient accounts for tensile deformation of the semi-solid domain and for the induced intergranular liquid feeding. The fluid flow model is then used to calculate the pressure drop in the mushy zone during the direct chill casting of aluminum alloy billets. The predicted pressure demonstrates that deep in the mushy zone where the permeability is low the local pressure can be significantly lower than the pressure predicted by averaging techniques. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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Type
research article
DOI
10.1016/j.actamat.2012.03.036
Web of Science ID

WOS:000304844400022

Author(s)
Sistaninia, M.
Phillion, A. B.
Drezet, J.-M.  
Rappaz, M.  
Date Issued

2012

Publisher

Elsevier

Published in
Acta Materialia
Volume

60

Start page

3902

End page

3911

Subjects

Solidification

•

Microstructure

•

Liquid feeding

•

Finite elements modeling

•

Hot tearing

•

Al-Cu Alloys

•

Aluminum-Alloys

•

Behavior

•

Permeability

•

Deformation

•

Coalescence

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LSMX  
Available on Infoscience
June 29, 2012
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/82490
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