Abstract
Combining with Pequet’s porosity model, this paper coupled vibration effect into the heat transfer models based on the turbulent heat transfer theory, on this basis porosity distribution of alloys under micro-amplitude vibration conditions can be analyzed. The simulated porosity results of ZL201 alloy show that appropriate vibration frequency (10Hz˜30Hz) promoted the mass feeding and capillary feeding by increasing the Dendrite Arm Spacing (SDAS) and heat transfer specific surface area of mass liquid channel, thus efficiently decreasing porosity distribution in casting. However, too high vibration intensity (40Hz˜50Hz) may deteriorate porosity distribution in casting due to insufficient feeding capacity. The vibration model provides a theoretical basis for the study on effect of mechanical vibration on casting, which is significant for the optimization of vibration parameters and porosity prevention in casting technology.
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