Prediction simulation method for macrosegregation and precipitation of inclusions in cast ingot

Abstract

The invention discloses a prediction simulation method for macrosegregation and precipitation of inclusions in a cast ingot. The prediction simulation method comprises the following steps: obtaining thermophysical parameters of a metal material and the inclusions; obtaining nucleation thermodynamic conditions of the inclusions; calculating and solving mass, momentum, energy and solute transmission required by solidification of the metal material; setting calculation boundary conditions, initializing calculation conditions, starting circulation, solving mass, momentum, energy and solute transmission of a liquid phase, a solid phase in an isometric crystal and a columnar crystal phase of the metal material in a coupling manner, judging nucleation and growth of the inclusions according to a thermodynamic nucleation bar criterion of the inclusions, and solving a distribution domain of the size and the number of the inclusions; the thermophysical property parameters are updated, convergence conditions are judged, and whether repeated iteration is conducted or not is determined according to the judgment result; and obtaining a simulation result until the cast ingot is solidified. The method is suitable for predicting macroscopic component distribution and inclusion distribution of various alloys and different tonnages of cast ingots, and has a reference effect on optimization of a cast ingot preparation process.

Description

technical field [0001] The invention relates to the field of metal ingot solidification process simulation, in particular to a prediction and simulation method for macrosegregation and precipitation inclusions in the ingot. Background technique [0002] Component segregation during solidification is an inherent characteristic of alloys. Therefore, there is a phenomenon of inhomogeneous composition in the ingot after solidification, which is called macrosegregation; macrosegregation is not only related to the properties of the material, but also to the liquid flow, equiaxed crystal deposition, and the formation and flow of non-metallic impurities in the material during the solidification process. During the solidification process, as the temperature decreases and the solute is enriched in the residual liquid phase, a considerable part of the solute elements combine with non-metallic elements to easily precipitate inclusions. This process consumes part of the solute and change...

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Problems solved by technology

[0003] At present, there are the following main problems in the simulation methods used for ingot segregation prediction at home and abroad: the interaction of liquid phase, equiaxed crystals, columnar crystals and inclusions is rarely considered at the same time; the influence of precipitation of inclusions on the final segregation is not considered ; Hardly follow the distribution of inclusions and quantitative analysis of nucleation conditions

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