Method for controlling electroslag melting casting by added transient magnetic field and electroslag smelting casting device

Abstract

The invention discloses a method for controlling electroslag melting casting by an added transient magnetic field. The method includes adding a transient magnetic field to a melting end of an electroslag remelting mother electrode, a liquid slag tank and a metal melting tank so that the transient magnetic field acts on large metal molten drops which are generated by initial melting at the tail end of the electrode and are converging to become big; under joint action of alternating lorentz force and pressure waves generated by the transient magnetic field, dispersing the metal molten drops in a burst manner into small metal molten drop groups, and randomly dispersing the small metal molten drop groups into the liquid slag tank to sufficiently contact with liquid slag after passing the liquid slag tank; after washing, enabling included foreign substances and impurities in the small metal molten drops to enter the liquid slag quickly, slowly settling and converging the foreign substances and impurities into the metal melting tank below the liquid slag tank, and finally crystallizing and solidifying to form solidified cast ingots. The invention further provides an electroslag melting casting device. By adding the transient magnetic field during electroslag melting casting and fining the molten drops by the aid of unique electromagnetic effect of the transient magnetic field, the purposes of improving refining efficiency, fining crystalline grains and reducing segregation of cast ingots are achieved, and industrial application value is realized.

Description

technical field [0001] The invention relates to a special steel electroslag metallurgy process and device, in particular to an electroslag casting method and an electroslag casting device. During the electroslag casting process, the refining effect is improved by applying a transient magnetic field to refine metal droplets , the method and device for refining solidification structure and reducing ingot segregation are suitable for the production of various electroslag products such as superalloys and precision alloys. Background technique [0002] As we all know, the hydrogen, nitrogen, carbon and non-metallic inclusions in the alloy will destroy the continuity of the matrix and become the source of micro-cracks. Under high stress, the crack propagation will cause the casting to break, thereby greatly reducing the service life of the material. As a high-efficiency refining method, electroslag casting can obtain a solidified structure with high purity, uniform and dense struc...

AI Technical Summary

Problems solved by technology

For example, the ultrasonic attenuation is very severe in the slag pool and the molten metal pool, and it is directional, and the ultrasonic power is limited and other factors limit its application; the external rotating magnetic field can drive the slag liquid and the molten metal pool to rotate, and it is expected to break the dendrites , but this will bring a huge risk of slag entanglement; rotating the mother electrode can also make the temperature of the slag pool uniform, but it will also bring the hazard of slag entanglement; and the slag pool heating technology has unique advantages in maintaining the uniform temperature distribution Advantages, so that a shallower metal molten pool can be obtained, which is conducive to the formation of a dendrite structure with near-axial growth, which has a positive effect on reducing the segregation of the ingot, but has no significant effect on refining grains and improving refining efficiency; Static magnetic field composite electroslag remelting technology has certain effects in improving the refining efficiency of electroslag remelting and refining grains. However, due to the low energy density and directional nature of the static magnetic field, its enhanced refining efficiency Granules still have a limited effect

It can be seen that there is still a lack of effective means to refine the molten droplets and solidification structure in the electroslag casting process

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