Reducing the Shrinkage Defects in the ZA27 Casting Alloy by Using Electric Pulse Current

Abstract:

Electric pulse current (EPC) was employed to treat ZA27 alloy cast in the sand mould during the solidification. The experiment results indicated that the shrinkage cavity and the porosity in the ZA27 alloy was apparently reduced. And correspondingly, the mechanical properties of the castings were certainly improved. The current pulse applied in the initial stage of the solidification produced a better treatment result. The density of the casting ZA27 alloy treated with EPC in initial stage and later stage increased by 4.1 and 1.6 percent than that without EPC, respectively.

• Periodical: Advanced Materials Research (Volumes 472-475)
• Pages: 1082-1086
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.472-475.1082
• Online since: February 2012
• Authors: Ming Gao, Guan Hu He, Tao Huang, Chuan Yin Wang, Gui Ying Yu
• Keywords: Casting Defects, Electric Pulse Current Treatment, Porosity, Shrinkage Cavity, ZA27 Casting Alloy

References

[1] Alan Kaye, Arthur Street, 1982, Die Casting Metallurgy, Butterworths & Co (Publishers) Ltd.

[2] Barnak, J. P., Sprecher, A. F. and Conrad, H., 1995, Colony grain size reduction in eutectic Pb-Sn casting by electropulsing, Scr. Metall. Mater.. 32(6), 879-884

DOI: 10.1016/0956-716x(95)93218-s

[3] Barnhurst, R. J., Gervais, E., Bayles, F. D., 1983, Gravity casting of Zinc-Aluminum alloys—Solidification behavior of ZA8, ZA12 and ZA27, AFS Transactions. 87, 569-584

[4] Barnhurst, R. J., Gervais, E., 1985, Gravity casting of Zinc-Aluminum alloys: Dependence of Mechanical Properties on Soundness, Microstructure, and Inclusion Content, AFS Transactions. 93, 591-602

[5] Flemings, M. C., 1991, Behavior of metal alloys in the semi-solid state, Metall. Trans. B. 22B, 269-293

[6] Gervais, E., Levert, H. Bess, M.., 1980, The development of a family of Zinc-base foundry alloys, AFS Transactions. 88, 183-194

[7] Jung, K., Conrad, H., 2003, Effect of an electric field on microstructure coarsening in 60Sn40Pb solders joints. Mater. Sci. and Eng. A. 356, 8-16

DOI: 10.1016/s0921-5093(02)00851-1

[8] Li Jianming, Li Shengli, Li Jin and Lin Hantong, 1994, Scr. Metall. Mater. . 31(12), pp.1691-1694

[9] Misra, A. K., 1985, A novel solidification technique of metals and alloys: under the influence of applied potentials. Metall. Trans. A. 16A, 1354-1355

DOI: 10.1007/bf02670340

[10] Nakada, M., Shiohara, Y. and Flemings, M. C., 1990, Modification of solidification structures by pulse electric discharging. ISIJ Inter. 30 (1), 27-33

DOI: 10.2355/isijinternational.30.27

[11] Okazaki, K., Kagawa, M. and Conrad, H., 1980, An evaluation of the contributions of skin, pinch and heating effects to the electroplastic effect in titatnium, Materials Science and Engineering. 45, 109-116

DOI: 10.1016/0025-5416(80)90216-5

[12] Sahoo, M., Whiting, L. V., Whit, D. W. G., 1985, Control of underside shrinkage in Zinc-Aluminum foundry alloys by the addition of trace elements, AFS Transaction. 93, 475-480

[13] Spencer, B., Mehrabian, R., and Flemings, M. C., 1972, Rheological Behavior of Sn-15Pct Pb in the Crystallization Range, Metall. Trans. 3, 1925-1932

DOI: 10.1007/bf02642580