Calculation method for viscoplastic tensile deformation of columnar crystal structure in steel solidification process

Abstract

The invention provides a method for calculating viscoplastic tensile deformation of a columnar crystal structure in a steel solidification process, and relates to the technical field of metallurgical continuous casting. The method comprises the following steps: based on a two-dimensional columnar crystal growth CA-FVM model, calculating a columnar crystal structure growth morphology; extracting growth morphology data of the columnar crystal structure under a specific solid fraction, and establishing a geometric model and a finite element model of the columnar crystal structure; based on the finite element model of the columnar crystal structure, setting viscoplasticity attributes of the columnar crystal structure, and establishing a constitutive model, namely a columnar crystal structure viscoplasticity model, representing the viscoplasticity mechanical behavior of the columnar crystal structure; setting conditions for calculating viscoplastic deformation of the columnar crystal structure; calculating viscoplastic deformation of the columnar crystal structure in finite element software, and carrying out visualization and data post-processing. The method can qualitatively characterize the deformation evolution condition of the columnar crystal structure under the tensile effect in the steel solidification process and the overlarge stress and strain concentrated distribution part, and can also qualitatively characterize the viscoplastic deformation mechanical behavior of the secondary dendritic crystal arm well.

Description

technical field [0001] The invention relates to the technical field of metallurgical continuous casting, in particular to a calculation method for viscoplastic tensile deformation of columnar grain structure during steel solidification. Background technique [0002] Continuous casting is a key link in material conversion in the iron and steel metallurgical production process, and it is also a key stage in saving energy and reducing consumption and improving the performance of steel. In the practice of continuous casting, cracks, as the main defect, seriously affect the quality of the slab. Internal cracks, as a type of cracks, mostly occur in the solidification process, and the deformation of solid dendrites at the solidification front is the direct cause of initial defects. Solid stress deformation is a common phenomenon in the continuous casting process. When the slab is still in the solidified state, the deformation can extend to the semi-solid mushy zone. This mushy re...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a calculation method for the viscoplastic tensile deformation of the columnar grain structure in the steel solidification process, to predict the viscoplastic deformation behavior of the columnar grain structure in the steel solidification process, and to analyze the columnar grain structure at the solidification front. The distribution of excessive stress and strain concentration in the grain structure lays a key foundation for clarifying the cracking tendency of columnar grains, understanding the formation mechanism of internal cracks from the microscopic level, and finally preventing crack defects in continuous casting slabs

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