| 摘要 |
The products of this invention are produced in an elongated casting vessel disposed in upright position to receive liquid metal for solidification within an electromagnetic field generating means disposed around the vessel along a portion of its length. The electromagnetic field generating means produces an upward lifting effect on liquid metal in the vessel together with a containment effect wherein the liquid metal is continuously urged upwardly into contact with the lower end of the solidifying product and maintained in a pressureless contact condition with respect to the walls of the casting vessel. In this way, voids and flaws are avoided and fully dense homogeneous products of uniform, small grain cross section result without wear on the casting vessel. The novel products of the invention are long metal bodies which are fully dense and of substantially uniform, fine grain cross section and constant composition throughout in each instance. In their as-cast condition, these bars, rods and other products have smooth, slightly wavy surfaces attributable to the fact that before, during and just after solidification, the metal of which they are formed is electromagnetically maintained out of contact with lateral support structure (such as the surface of a mold) and also due to the fact that the liquid metal at the solidification front is constantly stirred by induced eddy currents. The product may suitably be of multi-element composition which tends strongly to phase separation, however, because of the continuous stirring by induced eddy currents, the resulting products have a high degree of homogeneity.
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