Distribution & Access For Publication Downloads News About Us Contact Us
Paper Titles
MICAST – Microstructure Formation in Casting of Technical Alloys under Diffusive and Magnetically Controlled Convective Conditions
p.131
Interaction of Interdendritic Convection and Dendritic Primary Spacing: Phase-Field Simulation and Analytical Modeling
p.145
Simulation of ESA's msl Furnace Inserts and Sample-Cartridge Assemblies Using the Thermal Modeling Tool Crysvun
p.151
Experimental Observation of Convection during Equiaxed Solidification of Transparent Alloys
p.157
Control of the Macrosegregations during Solidification of a Binary Alloy by Means of a AC Magnetic Field
p.163
The Effect of Melt Flow on the Dendrite Morphology
p.169
Segregation with Spongy Deformation of the Mushy Zone during Solidification of the Skin of Steel Cast Products
p.175
Influence of Forced Convection on Columnar Microstructure during Directional Solidification of Al - Ni Alloys
p.181
Macrosegregation Caused by Deformation of the Mushy Zone
p.187

Control of the Macrosegregations during Solidification of a Binary Alloy by Means of a AC Magnetic Field

Article Preview

Abstract:

A numerical model aimed at simulating the segregations during the columnar solidification of a binary alloy is used to investigate the effects of a forced convection. Our objective is to study how the segregation characteristics in the mushy zone are influenced by laminar flows driven both by buoyancy and by AC fields of moderate intensity. Various types of magnetic fields have been tested, namely travelling, rotating magnetic field and slowly modulated electromagnetic forces. The calculations have been achieved on two types of alloys, namely tin-lead and aluminiumsilicon. It is shown that the flow configuration changes the segregation pattern. The change comes from the coupling between the liquid flow and the top of the mushy zone via the pressure distribution along the solidification front. The pressure difference along the front drives a mush flow, which transports the solute in the mushy region. Another interesting type of travelling magnetic field has been tested. It consists of a slowly modulated travelling magnetic field. It is shown that in a certain range of values of the modulation period, the channels are almost suppressed. The normal macrosegregation remains, but the averaged segregation in the mushy zone is weaker than in the natural convection case. The optimal period depends on the electromagnetic force strength as well as the cooling rate. The latter phenomenon cannot occur in the case of rotating magnetic fields, since in that configuration the sign of the pressure gradient along the solidification front remains unchanged. Recent solidification experiments with electromagnetic stirring confirm the predicted macrosegregation patterns.

You might also be interested in these eBooks
Solidification and Gravity IV View Preview

Info:

Periodical:

Materials Science Forum (Volume 508)

Pages:

163-168

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.508.163

Citation:

Cite this paper

Online since:

March 2006

Authors:

Xiao Dong Wang, A. Ciobanas, Florin Baltaretu, Anne Marie Bianchi, Yves Fautrelle

Keywords:

Electromagnetic Stirring (EMS), Numerical Modeling, Segregation, Segregation Control, Solidification

Export:

RIS, BibTeX

Price:

Permissions:

Request Permissions

References

[1] A.F. Giamei and B. H. Kear: Metall. Trans., vol. 1 (1970), p.2185.

Google Scholar

[2] A. Hultgren: Scand. J. Metallurgy, vol. 2 (1973), p.217.

Google Scholar

[3] G. Engström and H. Fredriksson: Scand. J. Metallurgy, vol. 12 (1983), p.3.

Google Scholar

[4] J. R. Sarazin and A. Hellawell: Metall. Trans., vol. 19A (1988), p.1861.

Google Scholar

[5] R. J. McDonald and J. D. Hunt: Trans. Met. Soc. AIME, vol. 245 (1969), p. (1993).

Google Scholar

[6] M. C. Flemings and G. E. Nereo: Trans. Met. Soc. AIME, vol. 239 (1967), p.1449.

Google Scholar

[7] M. C. Flemings, R. Mehrabian, and G. E. Nereo: Trans. Met. Soc. AIME, vol. 242 (1968), p.41.

Google Scholar

[8] M. C. Flemings and G. E. Nereo: Trans. Met. Soc. AIME, vol. 242 (1968), p.50.

Google Scholar

[9] W. D. Bennon, F. P. Incropera: Int. J. Heat Mass Transf., vol. 30 (1987), p.2161.

Google Scholar

[10] S. D. Felicelli, J. C. Heinrich, and D. R. Poirier: Metall. Trans. B, vol. 22 (1991), p.847.

Google Scholar

[11] S. D. Felicelli, J. C. Heinrich, and D. R. Poirier: Num. Heat Transf. B, vol. 23 (1993), p.461.

Google Scholar

[12] C. Y. Wang and C. Beckermann: Metall. Trans. A, vol. 27 (1996), p.2754.

Google Scholar

[13] C.Y. Wang and C. Beckermann: Metall. Trans. A, vol. 24A (1993), p.2787.

Google Scholar

[14] N. Ahmad, H. Combeau, J. L. Desbiolles, T. Jalanti, G. Lesoult, J. Rappaz, M. Rappaz, and C. Stomp: Metall. Trans A, vol. 29 (1998), p.617.

DOI: 10.1007/s11661-998-0143-9

Google Scholar

[15] M. Medina, Y. Du Terrail, F. Durand and Y. Fautrelle : Metall. Mat. Trans. B, vol. 35B (2004), p.743.

Google Scholar

[16] P. J. Prescott and F. P. Incropera: J. Heat Transfer, vol. 117 (1995), p.717.

Google Scholar

[17] A. Ciobanas, F. Baltaretu and Y. Fautrelle : published in the present proceedings.

Google Scholar

[18] M. Rappaz and Ph. Thevoz: Acta Metall., vol. 35, n° 7 (1987), p.1487.

Google Scholar

[19] G. Quillet, A. Ciobanas, P. Lehmann and Y. Fautrelle : Proc. MEP 2003 conference «Modelling for Electromagnetic Processing", Hannover, March 24-26( 2003).

Google Scholar

Scientific.Net is a registered brand of Trans Tech Publications Ltd
© 2024 by Trans Tech Publications Ltd. All Rights Reserved