Continuously cast blank homogenization device and method

Abstract

The invention provides a continuously cast blank homogenization method and device. According to the method, a pulse harmonic wave magnetic field coil is arranged at the position below a continuous casting machine crystallizer, and a continuous harmonic wave magnetic field coil is arranged at the tail end of a continuous casting machine; and in the continuous casting production process, firstly, when a continuously cast blank passes through the pulse harmonic wave magnetic field coil, a large number of primary crystal nucleus are formed through the action of a pulse harmonic wave magnetic field, and then, when the continuously cast blank passes through the continuous harmonic wave magnetic field coil, under the action of the violent stirring by a continuous harmonic wave magnetic field, thelarge number of crystal nucleus are uniformly dispersed in a melt through the action of a flow field, so that the continuously cast blank with a homogenized solidification structure is obtained. Themethod and the device are used for semi-continuous casting and continuous casting production in the metallurgical industry, and are suitable for homogenization of the solidification structures of various metal materials.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and metal material preparation, and in particular relates to a continuous casting slab homogenization device and method. Background technique [0002] The study of physical fields on the solidification process of metals first began in the 1930s, and has not developed much since then. This is because the requirements for high-density current, super-strong magnetic field and high-power ultrasound severely restrict the application of this technology. In addition, during that period, the solidification structure refinement technologies such as inoculation treatment, modification treatment and micro-alloying in the material field developed rapidly, and people were more willing to accept these simple solidification and fine-graining technologies. After entering the 21st century, the coordination of the material environment has raised questions about the traditional fine grain technology. At the same...

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Problems solved by technology

The heavy pressure and light pressure methods both apply a certain deformation pressure at the solidification end of the continuous casting slab, so that a small amount of remaining melt in the liquid core penetrates into the core to effectively weld the solidification shrinkage cavity and eliminate the central shrinkage cavity. It is difficult to determine the position of the solidification end of the continuous casting slab, and the amount of reduction cannot be accurately controlled, which may easily lead to internal cracks

Like electromagnetic stirring, pulsed magnetic oscillation can also generate electromagnetic force in the metal melt, which can stir and vibrate the melt; the unique feature is that pulsed magnetic oscillation can generate greater electromagnetic force oscillation, which promotes melting Body nucleation, detachment, and drift to become free heterogeneous cores, and then achieve the effect of refining the solidification structure, but the contribution of pulse magnetic oscillation to the macroscopic flow of the melt is weak, and it is sometimes insufficient for the center of the continuous casting slab to shrink.

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