Casting mold experimental equipment for technology under simulating light press continuous casting blank and method

Abstract

The invention belongs to the steelmaking continuous casting technical field, and particularly provides a mold casting experimental device and a method thereof for simulating the soft-reduction technique of a continuous casting blank. The device is characterized in that the inner wall of a water-cooling copper mold can move; displacement signals can be acquired and recorded; and by the soft-reduction mold casting, the solidification process of the continuous casting blank under different soft-reduction process parameters can be stimulated. The structure evolution rule of the continuous casting blank is studied, and the influencing factors on the crack generation and central looseness of the casting blank are analyzed. During the experiment process, the macroscopic deformation rule of the continuous casting blank during the continuous casting process using the soft-reduction process is analyzed by the variation of the soft-reduction force, the soft-reduction total amount and the soft-reduction rate. By the metallurgical analysis, the action of the soft-reduction process on the enlargement of a central equiaxial crystal zone, the central looseness and segregation and the variation of the structure growth process is determined. By the soft-reduction experiments in different solid rate sections using the two-side and four-side soft-reduction processes, the reasonable soft-reduction process parameters during the continuous casting process are determined.

Description

Technical field: [0001] The invention belongs to the technical field of steelmaking and continuous casting, and in particular provides a casting mold experiment equipment and method for simulating the soft reduction technology of continuous casting slabs. Background technique: [0002] The soft reduction technology was developed on the basis of the shrinkage roll gap technology in the 1970s. Under the effect of fractional crystallization, the liquid at the end of the billet cannot be effectively replenished to the front end, and a negative pressure is formed between the "crystal bridges". The liquid between the dendrites flows to the center of the slab, forming more serious center segregation and porosity. During the solidification process of the continuous casting slab, external force is applied to the slab to compensate for the solidification shrinkage and break the formed "crystal bridge", so that the molten steel in the slab can flow freely, and the center segregation an...

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Problems solved by technology

[0005] At present, the research on the microstructure evolution in the continuous casting process, especially the metallographic structure change of the cast slab under light pressure, is still limited to the analysis of the low-magnification structure. For the nucleation, growth and phase transformation of grains and other studies still lack certain experimental means

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