Low-Frequency Electromagnetic Field Influencing Horizontal Direct Chill Casting of Aluminum Alloy Rods

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The horizontal direct chill (HDC) casting process is a well-established production route for an aluminum alloy ingot; however, the ingot may suffer from inhomogeneous microstructures and serious macrosegregation due to the unbalanced cooling condition and gravitational effect. In order to control the defect, a low frequency electromagnetic field has been applied in the HDC casting process and its influences on microstructures and macrosegregation have been studied. The results show that the low frequency electromagnetic field can improve macrostructures, reduce inhomogeneous microstructures and macrosegregation in HDC product; and two main parameters of the electromagnetic field—density and frequency influence the microstructures and solution distribution along the diameter of the ingot significantly. In the range of ampere-turns and frequency employed in the experiments, the optimum ampere-turns and frequency have been found to be 10000At, 30Hz.

Info:

Periodical:

Materials Science Forum (Volumes 546-549)

Edited by:

Yafang Han et al.

Pages:

691-696

Citation:

Z. H. Zhao et al., "Low-Frequency Electromagnetic Field Influencing Horizontal Direct Chill Casting of Aluminum Alloy Rods", Materials Science Forum, Vols. 546-549, pp. 691-696, 2007

Online since:

May 2007

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$38.00

[1] A.A. Dawood, Improving horizontal direct chill casting , [in] Proceedings of the Australian Asian Pacific Conference on Aluminum Cast House Technology , Warrendale, America, (2001).

[2] T.P. Wertli, Metallurgia, 1986, 53: 192.

[3] C. Vivès, R. Ricou, Metall. Trans. 1985, B16: 377.

[4] J.L. Meyer, J. Szekely, N. Elkaddah, C. Vive`s, R. Ricou, Metall. Trans. 1987, B18: 529.

[5] C. Vivès, , Metall. Trans. 1989, B20: 623.

[6] C. Vivès, Metall. Trans. 1989, B20: 631.

[7] A.V. Reddy, C. Beckermann, Metall. Mater. Trans. 1997, B28: 479.

[8] C.J. Vreeman, M. Krane, F.P. Incropera, Int. J. Heat Mass Transfer 2000, 43: 687.

[9] B. Zhang, J. Cui, Mater. Let. 2003, 57: 1707.

[10] B. Zhang, J. Cui, Mater. Sci. Eng. A 2003, 355(25); 325.

[11] Yoh. Ishii, Light Metals 1989, 673.

[12] C.R. Paul, S.A. Nasar, , Edited by McGraw-Hill, New York, 1987. Fig. 8 (a) Zn concentration profile from bottom to top surface under different frequencies of electromagnetic field; (b) Zn concentration profile inside crystal grain under different frequencies of electromagnetic field 0 10 20 30 40 50 60 5. 8 5. 9 6. 0 6. 1 6. 2 6. 3 Content of Zn element / wt. % Distance in the vertical diameter direction in cross-section / mm 10Hz 30Hz 50Hz 100Hz a b 10 20 30 40 50 60 70 80 90 100 5. 1 5. 2 5. 3 5. 4 5. 5 5. 6 5. 7 5. 8 5. 9 Average content of Zn (wt. %) Electromagnetic field frequency (Hz).