Solid/liquid interface detection in continuous casting processes

Details Solid/liquid interface detection in continuous casting processes Solid/liquid interface detection in continuous casting processes

1994-08-25

1996-04-23

Seidel, Richard K.

Metal founding

Process

With measuring, testing, inspecting, or condition determination

164455, 164413, 164414, B22D 1120, B22D 1122, B22D 1116

Patent

active

055094600

ABSTRACT:
A liquid metal/solid metal interface detecting device comprises in general a radiation source for generating gamma radiation, which is directed to pass through a strand extruded from a continuous casting mold. A detector detects the gamma radiation passing through the partially solidified strand to determine a spatial profile for a liquid metal/solid metal interface by relying on the different gamma radiation attenuation characteristics of the solid metal and the liquid metal. Preferably, the gamma radiation is at energies of greater than one million electron volts. In some embodiments, a movable support carries the radiation source and the detector and moves the radiation source and detector along and around the ingot enabling generation of a three-dimensional profile of the liquid metal/solid metal interface by utilizing tomographic imaging techniques. Alternatively, solidification at a single region is determined and this information is used to control the formation of the strand in process controller implementations.

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Chu, M. G., "A Novel Technique for Outlining the Solidification Crater Profile of a Commercial-Size Aluminum Alloy Ingot Cast by the Direct Chill Method," Metallurgical Transactions, A, 23A:2323-2326 (Aug. 1992).
G. N. Deryabina, et al., "Measuring the Ratio of Liquid and Solid Phases in a Continuously Cast Ingot," S. Ordzhonikidze Azovstal Zhdanovsk Metallurigical Plant (22 Jan. 1979), with English Abstract and translation .

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