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As-cast grain size distribution prediction for grain refined castings via simulating free equiaxed dendrite transport during solidification
Author(s)
Date Issued
2011
Date Available
2013-10-21T08:44:40Z
Abstract
In foundry practice, as-cast microstructure is a key concern. It is well accepted that gravitydriven transport processes have an influence on the final microstructure of shape cast components. A predictive model to simulate equiaxed solidification, which treats dendrite transport in the solidifying alloy melt, at low computational cost, is presented in this article. The non-equilibrium solidification model considers nucleation from industrial inoculants, growth and transport of the equiaxed dendrites. The motion of free dendrites is computed as the combined effects of sedimentation settling and transport of free dendrites by the liquid flow due to natural convection. When free dendrites become coherent at the latter stage of solidification, the equiaxed mush of coherent dendrites is assumed to demonstrate characteristics of a porous medium, until it becomes completely solid. Simulations are used to establish the sensitivity of
the as-cast structure of Al-Si shape castings to the magnitude of mould/alloy heat transfer coefficients. It was found that the effects of dendrite sedimentation are higher for low values of this heat transfer coefficient.
Sponsorship
Other funder
Other Sponsorship
European Space Agency (ESA) via
PRODEX funding (contract number 90267).
Type of Material
Journal Article
Publisher
Giessereiverlag
Journal
International Foundry Research
Volume
63
Issue
1
Start Page
28
End Page
33
Copyright (Published Version)
2011 Giessereiverlag
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
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