Abstract
The mechanism responsible for this type of crack was discovered in studies of the thermal and stress--strain state of a flat ingot 150 x I000 mm in cross section in the mold of a continuous caster. The studies were based on the use of a certain mathematical model [0. V. Martynov, S. V. Khokhlov, and A. M. Kondratyuk, "Mathematical modeling of the thermal and stress-strain state of a continuous-cast ingot solidified in the mold zone," in: Mathematical Modeling of Metal and Alloy Solidification Processes [in Russian], Novosibirsk (1983), pp. 76-77], It was established that a gas gap is formed under the surface of the liquid metal near the ingot-mold boundary. The skin of the ingot bends here under the pressure of the molten metal, and there is sharp reduction of heat removal from the ingot. This in turn lowers the rate of increase in the thickness and strength properties of the skin and rapidly lowers the temperature in the inside layers of the skin relative to its external layers.
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