Abstract

Apparatus and process for improving cast metals and alloys quality in desired locations. At least one first polarity electrode and at least one second polarity electrode are placed in a metallic cast situated in a non conductive mold, the electrodes capable of inducing changing electric fields within a cast, that may cause metal flow and stirring of the molten metal in desired areas, typically close to the first polarity electrodes. Stirring of molten metal in desired areas of a cast during solidification may improve the microstructure and porosity level in the treated areas, thus may improve mechanical properties of the cast part, such as elongation, fatigue and strength.

IPC Classes  ?

• B22D 11/00 - Continuous casting of metals, i.e. casting in indefinite lengths
• B22D 27/02 - Use of electric or magnetic effects

Abstract

A method and system for the reduction, and even fully elimination of the heat treatment phase of metal casting are disclosed. The method and system involve applying at least one moving electrical arc over the upper surface of the molten metal in the cast while it solidifies in order to stir it by the forces induced by the electrical arc. The stirring caused by the applied moving electrical arc improves at least one of the casting features including mechanical features, chemical homogeneity and microstructure refinement. This phenomenon enables reduction and even elimination of the heat treatment phase.

IPC Classes  ?

• B22D 27/06 - Heating the top discard of ingots
• B22D 11/11 - Treating the molten metal