Method for determining dendritic crystal network permeability of steel solidification pasty region

Abstract

The invention provides a method for determining the dendritic crystal network permeability of a steel solidification pasty zone, and relates to the technical field of steel casting and continuous casting. The method comprises the following steps: firstly, acquiring the carbon element content, physical property parameters and cooling conditions of a steel grade, and setting grid geometric dimensions used by a steel dendritic crystal growth calculation domain, a seepage calculation domain and a discrete calculation domain; then dispersing a dendritic crystal growth calculation domain, generating CA cells, establishing a steel three-dimensional dendritic crystal growth model, solving a dendritic crystal evolution process of a steel solidification pasty region, and further outputting dendritic crystal structure information at different solidification moments; constructing a control equation of the steel dendritic crystal network seepage model, and generating finite body elements of the seepage model; reconstructing a steel dendritic crystal network structure, and setting a calculation boundary condition and an initial condition of molten steel flowing through a dendritic crystal network; iteratively calculating a velocity field and pressure distribution in a seepage calculation domain based on a Simple algorithm; and finally outputting molten steel flow information in the dendritic crystal network, and determining the permeability of the dendritic crystal network. The steel dendritic crystal network permeability under different solid phase rates and cooling conditions is determined.

Description

technical field [0001] The invention relates to the technical field of steel casting and continuous casting, in particular to a method for determining the permeability of a dendrite network in a solidified mushy region of steel. Background technique [0002] With the rapid development of the national economy and national strategic industries, the demand for high-quality steel is becoming more and more urgent, in order to serve in long-term and stable service under complex working conditions and environmental conditions. Although soft reduction and electromagnetic stirring technologies are widely used at present, solidification defects such as cracks and segregation are still restrictive links in the production of high-quality steel in my country. The reason is that the understanding of the solidification behavior of steel is still at the macro-transport level, and has not been effectively coupled with the solidification structure. As a typical solidification structure of st...

AI Technical Summary

Problems solved by technology

The key to determining the permeability of the steel mushy zone is to obtain the three-dimensional dendrite structure during the solidification process of the steel, but it has not been achieved by relying on the existing detection methods.

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