JOM, November 1st, 2006
In the casting of aluminum alloys and, in general, in the casting of film-forming alloys, the entrainment of oxides into the bulk liquid severely reduces the strength of the cast part. To avoid this, the melt velocity must be kept below a certain value, namely critical velocity, which is widely assumed to be 0.5 m/s. In this paper the authors investigate, by means of fluid-dynamic computer simulation, the dependence of critical velocity on geometrical features of the running channels and thermophysical properties of the molten metal. For each of the geometries studied, once the critical veloci...
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