Method for calculating MnS dendritic crystal stress caused by forced convection in molten steel solidification process

Abstract

The invention discloses a method for calculating MnS dendritic crystal stress caused by forced convection in the molten steel solidification process. The method comprises the steps that 1, steel gradecomponents, solidification conditions and boundary conditions are collected; 2, an interface growth direction, liquid-phase solute field and temperature field distribution and solid-phase region solute field distribution are calculated by adopting a cellular automaton model; meanwhile, a classic model D2Q9 in a lattice Boltzmann method is coupled to calculate flow field speed distribution; 3, forcomplex boundary flow, a Mei correction F-H format is adopted, the speed is increased in the X direction, free boundary conditions are added to the right side, and a dendritic crystal stress growth model under the Fe-C-Mn-S quaternary alloy flow field is established in combination with a lattice Boltzmann method; and 4, the shape, the size and the stress condition of the MnS dendritic crystal inan image manner are displayed by utilizing data analysis and visual processing software. According to the method, the solidification technology is optimized, stress analysis of dendrites under forcedconvection is predicted, and theoretical guidance is provided for improving the casting blank quality.

Description

Technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and relates to a method for calculating the force of forced convection on MnS dendrites during the solidification of molten steel. Background technique [0002] The iron and steel industry is an important pillar basic industry of the national economy. During the solidification of molten steel, as the temperature decreases, the surface layer of the cast slab begins to nucleate and grow to form columnar crystals, and with the growth of columnar crystals, the solute at the front of the solid-liquid interface is heavily enriched. MnS inclusions of different sizes have different effects on the properties of steel. For this reason, the prediction of the precipitation of inclusions during the solidification of molten steel is of great significance for the control of slab cracks and the improvement of slab quality. During the continuous casting process, the molten steel in the slab will co...

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Problems solved by technology

However, this method is cumbersome to solve, has a large amount of calculation, and has poor numerical stability. In addition, when dealing with dendrite curved edges, wall functions are needed, which increases the solution error.

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