A new indirect method to measure fraction solid in molten metals is presented. The method is based on the phenomena that when a metal sample (solid or liquid) rotates in a magnetic field (or the magnetic field rotates around a stationary sample), circulating eddy currents are induced in the sample, which generate an opposing torque related to amount of solid phase in a solidifying melt between the liquidus and solidus temperatures. This new technique is applied for measuring fraction solid on commercial A319 aluminum alloy. The solidification curves obtained by the proposed method at different cooling rates are in good agreement with predictions made by the Scheil model.
Issue Section:
Technical Papers
1.
L. Ba¨ckerud, Chai, G., and Tamminen, J., 1997, “Solidification Characteristics of Aluminum Alloys,” 2, Foundry Alloys, AFS/Skanaluminium.
2.
Saunders
, N.
, 1996
, “Phase Diagram Calculations for Commercial Al-Alloys
,” Mater. Sci. Forum
, 217–222
, pp. 667
–672
.3.
Huang
, H.
, Suri
, V. K.
, Hill
, J. L.
, and Berry
, J. T.
, 1991
, “Heat Source/Sink Algorithm for Modeling Phase Changes During Solidification in Castings and Water Evaporation in Green Sand Molds
,” AFS Transactions
, 54
, pp. 685
–689
.4.
Stefanescu
, D. M.
, Upadhya
, G.
, and Bandyopaadhyay
, D.
, 1990
, “Heat Transfer-Solidification Kinetics Modeling of Solidification of Castings
,” Metall. Trans.
, 2A
, pp. 997
–1005
.5.
Kiuchi
, M.
, Sugiyama
, S.
, and Arai
, K.
, 1979
, “Experimental Study on Mushy Metal Forming
,” J. Jpn. Soc. Technol. Plast.
, 20
(223
), pp. 762
–765
.6.
Kiuchi
, M.
, and Sugiyama
, S.
, 1994
, “A New Method of Detect Solid Fractions of Mushy/Semi-Solid Metals and Alloys
,” Annals of The CIRP
, 43
(1
), pp. 1
–4
.7.
Jeng
, S. C.
, and Chen
, S. W.
, 1996
, “Determination of The Solidification Characteristics of The A356.2 Aluminum Alloy
,” Mater. Sci. Forum
, 217–222
, pp. 283
–288
.8.
Flemings, M. C., Solidification Processing, McGraw-Hill, 1972.
9.
Djurdjevic
, M. B.
, Kierkus
, W. T.
, Byczynski
, G. E.
, Stockwell
, T. J.
, and Sokolowski
, J. H.
, 1999
, “Modeling of Fraction Solid for the 319 Aluminum Alloy
,” AFS Transactions
, 14
, pp. 173
–179
.10.
Iida, T., and Guthrie, R. I. L., The Physical Properties of Liquid Metals, Clarendon Press, Oxford, 1988, pp. 227–229.
11.
Moffatt
, H. K.
, 1965
, J. Fluid Mech.
, 22
(3
), pp. 521
–528
.12.
Rappaz
, M.
, 1989
, “Modeling of Microstructure Formation in Solidification Processes
,” Int. Mater. Rev.
, 34
(3
), pp. 93
–123
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