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Determination of solid fraction evolution during solidification of aluminum alloy in presence of linear electromagnetic stirring

Kumar, P and Lakshmi, H and Dutta, P (2009) Determination of solid fraction evolution during solidification of aluminum alloy in presence of linear electromagnetic stirring. In: International Mechanical Engineering Congress & Exposition, November 13-19, 2009, Lake Buena Vista, Florida, USA.

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Abstract

In many industrial casting processes, knowledge of the solid fraction evolution during the solidification process is a key factor in determining the process parameters such as cooling rate, stirring intensity and in estimating the total solidification time. In the present work, a new method of estimating solid fraction is presented, which is based on calorimetric principles. In this method, the cooling curve data at each point in the melt, along with the thermal boundary conditions, are used to perform energy balance in the mould, from which solid fraction generation during any time interval can be estimated. This method is applied to the case of a rheocasting process, in which Al-Si alloy (A356 alloy) is solidified by stirring in a cylindrical mould placed in the annulus of a linear electromagnetic stirrer. The metal in the mould is simultaneously cooled and stirred to produce a cylindrical billet with non-dendritic globular microstructure. Temperature is measured at key locations in the mould to assess the various heat exchange processes prevalent in the mould and to monitor the solidification rate. The results obtained by energy balance method are compared with those by the conventional procedure of calculating solid fraction using the Schiel equation.

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to Asme.
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Ms TV Yashodha
Date Deposited: 14 Sep 2011 05:25
Last Modified: 14 Sep 2011 05:25
URI: http://eprints.iisc.ac.in/id/eprint/40156

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