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Numerical value simulation method for continuously casting billet center segregation behavior study

A numerical simulation, continuous casting billet technology, applied in the direction of instrument, adaptive control, control/regulation system, etc., can solve the problem that affects the calculation accuracy of the model and its applicable scope, and is not conducive to the effective and accurate control process of continuous casting center segregation. To achieve the effect of effective control of homogeneity and density, improvement of calculation efficiency and accuracy, and wide application range

Inactive Publication Date: 2017-03-08
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These have greatly affected the calculation accuracy and scope of application of the above model, which is not conducive to the effective and accurate formulation of the control process related to continuous casting center segregation

Method used

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  • Numerical value simulation method for continuously casting billet center segregation behavior study
  • Numerical value simulation method for continuously casting billet center segregation behavior study
  • Numerical value simulation method for continuously casting billet center segregation behavior study

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] For the billet continuous casting system whose main technical parameters are shown in Table 1, considering that the continuous casting system has both mold and terminal electromagnetic stirring, the calculation domain of the electromagnetic-heat-solute coupling mathematical model of continuous casting is divided into three Area: upper three-dimensional turbulent flow area (within 1.4m from the liquid steel surface), middle two-dimensional laminar flow area (1.4m to 11m from the steel liquid surface) and lower three-dimensional forced convection area (11m to 12m from the steel liquid surface) . The above different computational domains are all divided by non-uniform hexahedral grids, as shown in figure 1 shown. Table 2 lists the thermophysical parameters of the steel types in the coupling model (taking cast bearing steel GCr15 as an example). Table 3 lists the degree of superheat and the length and water volume of each zone of secondary cooling during the casting proce...

Embodiment 2

[0102] For the round billet continuous casting system whose main technical parameters are shown in Table 4, considering that the continuous casting system only has mold electromagnetic stirring, the calculation domain of the coupled mathematical model is divided into two regions: the upper three-dimensional turbulent region (the molten steel surface to within 1.4m from it) and the lower two-dimensional laminar flow area (1.4m to 14m from the molten steel surface). Based on this, taking cast low carbon steel 20 steel as an example, the center segregation behavior in the continuous casting process was analyzed. Among them, Table 5 lists the thermophysical parameters of 20 steel; Table 6 lists the casting superheat and the length and water volume of each zone of the secondary cooling; the specific boundary conditions refer to the description in Example 1.

[0103] Table 4 Main Technical Parameters of Round Billet Continuous Casting

[0104] project parameter projec...

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Abstract

The invention provides a numerical value simulation method for a continuously casting billet center segregation behavior study. The numerical value simulation method comprises the steps of: dividing an entire continuously casting billet computational domain into a turbulent region, a layer flow flowing region and a forced convection region on the basis of deep analysis of a macroscopic transport phenomenon in the continuous casting process, wherein the turbulent region and the forced convection region each adopt a three-dimensional model for calculation, the layer flow flowing region adopts a two-dimensional slicing model for calculation, and data transmission among different regions adopts 2D-3D interface data for transmission so as to realize linkage among multi-dimensional model data; and completing the calculation of a coupling mathematical model based on large-scale hydrodynamic software Fluent and large-scale finite element software ANSYS platforms. The numerical value simulation method effectively improves calculation efficiency and precision of a continuous casting center segregation mathematical model, is wide in application range, is suitable for the continuous casting process of modern plate billets, square billets and round billets, and is expected to realize effective control of internal homogeneity and compactness of casting billets, especially heavy-section casting billets on a level of center segregation formation mechanism understanding.

Description

technical field [0001] The invention belongs to the field of continuous casting central segregation behavior prediction, in particular to a central segregation behavior numerical simulation method suitable for modern continuous casting process characteristics. Background technique [0002] In the continuous casting process, the central segregation problem caused by the long-distance flow of concentrated molten steel at the solidification front has always been a bottleneck for the improvement of the internal quality of the slab, especially for high-carbon and high-alloy steels, such as ball bearing steel and steel for hard wire , Die steel, etc. Central segregation and its accompanying increase in porosity not only affect the subsequent hot-working performance and yield of cast slabs, but also directly affect the stability of the microstructure and mechanical properties of rolled products. In view of this, it is of great significance to further improve the performance of ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 孙海波陈东初王敬慧张敏
Owner FOSHAN UNIVERSITY