Analysis of a Microgravity Solidification Experiment for Columnar to Equiaxed Transitions with Modeling Results

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Title: Analysis of a Microgravity Solidification Experiment for Columnar to Equiaxed Transitions with Modeling Results
Authors: McFadden, Shaun
Browne, David J.
Sturz, Laszlo
et al.
Permanent link: http://hdl.handle.net/10197/4701
Date: May-2010
Abstract: This paper studies the Columnar to Equiaxed Transition (CET) in an Al-7wt%Si binary alloy with and without Al-Ti-B grain refiner. A microgravity experiment was designed to produce a CET in this alloy system. The experiment was flown onboard the MAXUS-7 sounding rocket platform, which achieved twelve minutes of microgravity. Examples of CET were successfully produced during the unmanned flight. Temperature data were recorded from thermocouples in the crucible walls of the furnace. Post-mortem material characterization of the grain structure was also performed. Subsequently a model of the furnace, which used a front-tracking model of solidification and an inverse heat calculation method, was developed. In this paper, results from the model are compared to the experimental findings; agreement is found with the CET predictions. The results from the model are then used to compare findings with the CET criterion of Hunt from the literature. Agreement is found between the model predictions and the Hunt criterion.
Type of material: Journal Article
Publisher: Trans Tech Publications
Copyright (published version): 2010 Trans Tech Publications
Keywords: Solidification modeling;Columnar Equiaxed Transition (CET)
DOI: 10.4028/www.scientific.net/MSF.649.361
Language: en
Status of Item: Peer reviewed
Appears in Collections:Mechanical & Materials Engineering Research Collection

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