Ingot produced by a continuous casting method

Details Ingot produced by a continuous casting method Ingot produced by a continuous casting method

1985-11-15

1987-07-21

Rutledge, L. Dewayne

Stock material or miscellaneous articles

All metal or with adjacent metals

Intermediate article

148425, 148427, B22D 1100, B22D 2702

Patent

active

046817875

ABSTRACT:
A method is described for continuously casting an ingot of a metal alloy of a type having a substantial liquidus-solidus temperature range to produce internal microstructure of a desired fineness. Molten alloy is flowed along an electron beam heated skulled hearth while controlling the electron beam to maintain a solids content in the alloy on the hearth of between about 15% and about 40%. The alloy is poured from the hearth into the top of a continuous casting mold at a rate which produces a thixotropic region at the upper end of the fully solidified alloy in the mold. The ingot produced is characterized by a macrostructure in excess of one millimeter average grain dimensions with a non-uniform shape, orientation, and distribution, and is characterized by a microstructure of the order of fifty micron cell spacing of dendritic crystallites comprising the microstructure.

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Flemings, M. C. et al., Thixocasting of Steel, 9th SDCE International Die Casting Exposition & Congress, Paper No. G-T77-092, 1977.
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Flemings, Merton C., Solidification Processing, 1974, McGraw-Hill Series in Materials Science and Engineering, pp. 58-91.
H. Stephan, W., Dietrich, "Production of Superclean Material for Electronic and Power-Generator Application", May 6, 1984, pp. 1-56.

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