Abstract: The ZA27 alloy cast in a sand mould was treated with electric current pulse (EP)during the solidification. The experiment result indicates that the treatment of the electric current can apparently reduce the shrinkage cavity and the porosity. The density of the casting after treating with EP increases by 2.5% than that before EP. The current pulse applied in the solidification can also affect the distribution of the defects in the casting.
Effect of electric current pulse on shrinkage cavity and porosity in casting ZA27 alloy
Abstract:
The ZA27 alloy cast in a sand mould was treated with electric current pulse (EP) during the solidification. The experiment result indicates that the treatment of the electric current can apparently reduce the shrinkage cavity and the porosity. The density of the casting after treating with EP increases by 2.5% than that before EP. The current pulse applied in the solidification can also affect the distribution of the defects in the casting.
Fig.4 Photographs of shrinkage cavity and porosity in ZA27 alloy treated with pulse current and without pulse current (a) —Without pulse current; (b) —With pulse current at beginning of solidification; (c) —With pulse current in solidification
表1 脉冲电流处理前后ZA27合金密度
Table 1 Density values of ZA27 alloy treated with pulse current and without pulse current