In many industrial casting processes, knowledge of the solid fraction evolution during the solidification process is a key factor in determining the process design parameters such as cooling rate and stirring intensity, and in estimating the total solidification time. In the present work, a new method for 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 nondendritic 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 Scheil’s equation.
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March 2012
Research Papers
A Calorimetric Method for Determination of Solid Fraction During Solidification in a Linear Electromagnetic Stirrer
P. Kumar,
P. Kumar
George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology
, Atlanta, GA 30318
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H. Lakshmi,
H. Lakshmi
Department of Mechanical Engineering,
Indian Institute of Science
, Bangalore 560012, India
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P. Dutta
P. Dutta
Fellow ASME
Department of Mechanical Engineering,
e-mail: pradip@mecheng.iisc.ernet.in
Indian Institute of Science
, Bangalore 560012, India
Search for other works by this author on:
P. Kumar
George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology
, Atlanta, GA 30318
H. Lakshmi
Department of Mechanical Engineering,
Indian Institute of Science
, Bangalore 560012, India
P. Dutta
Fellow ASME
Department of Mechanical Engineering,
Indian Institute of Science
, Bangalore 560012, India
e-mail: pradip@mecheng.iisc.ernet.in
J. Thermal Sci. Eng. Appl. Mar 2012, 4(1): 011006 (10 pages)
Published Online: March 19, 2012
Article history
Received:
May 17, 2011
Accepted:
September 23, 2011
Published:
March 9, 2012
Online:
March 19, 2012
Citation
Kumar, P., Lakshmi, H., and Dutta, P. (March 19, 2012). "A Calorimetric Method for Determination of Solid Fraction During Solidification in a Linear Electromagnetic Stirrer." ASME. J. Thermal Sci. Eng. Appl. March 2012; 4(1): 011006. https://doi.org/10.1115/1.4005195
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