NDLI: Determination of Solid Fraction Evolution During Solidification of Aluminum Alloy in Presence of Linear Electromagnetic Stirring

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Kumar, Pramod Lakshmi, Hamsa Dutta, Pradip
Copyright Year	2009
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.
Starting Page	2079
Ending Page	2089
Page Count	11
File Format	PDF
ISBN	9780791843826
DOI	10.1115/IMECE2009-12751
e-ISBN	9780791838631
Volume Number	Volume 9: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B and C
Conference Proceedings	ASME 2009 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2009-11-13
Publisher Place	Lake Buena Vista, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Semi solid Linear electromagnetic stirring Calorimetric Solid fraction Schiel’s equation Energy budget (physics) Casting Heat Temperature Cooling Metals Alloys Aluminum alloys Annulus Boundary-value problems Solidification
Content Type	Text
Resource Type	Article

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