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Ingot casting macrosegregation numerical simulation method

A technology of numerical simulation and macrosegregation, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as inaccurate prediction, and achieve the effect of huge market application potential

Inactive Publication Date: 2015-09-02
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing macro-segregation calculations cannot accurately predict the formation of macro-segregation under the comprehensive action of different physical mechanisms, and propose a numerical simulation method for ingot macro-segregation

Method used

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  • Ingot casting macrosegregation numerical simulation method
  • Ingot casting macrosegregation numerical simulation method
  • Ingot casting macrosegregation numerical simulation method

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specific Embodiment approach 1

[0029] The numerical simulation method for ingot macro-segregation in this embodiment, such as Figure 9 As shown, the numerical simulation method for ingot macrosegregation is realized through the following steps:

[0030] Step 1. In the X direction and Y direction of the ingot casting system of X×Y meters, perform macro-scale grid division with the grid division step size △x in the X direction and the grid division step size △y in the Y direction, respectively. , forming a series of computing grids, and by (j, k) char＝z Indicates the type of computing grid;

[0031] Among them, △x=△y, the value ranges of △x and △y are both 1×10 -3 ~4×10 -3 m; j, k and z are all integers, j represents the label of the grid in the direction of the X axis in the two-dimensional array, and the value range of j is 1 to M, k represents the label of the grid in the Y-axis direction in the two-dimensional array, and the value range of k is 1 to N. z represents the type of calculation grid, an...

specific Embodiment approach 2

[0037] The difference from Embodiment 1 is that the numerical simulation method for ingot macrosegregation in this embodiment, when the calculation grid type z takes different values, it represents different types of grids, specifically: when z=2, ( j, k) char＝2 Indicates the casting grid; when z=0, (j,k) char＝0 Indicates the ingot grid; when z=4, (j, k) char＝4 Indicates the internal cooling iron grid; when z=5, (j, k) char＝5 Indicates the outer cooling iron grid; when z=6, (j, k) char＝6 Indicates the riser grid; when z=7, (j, k) char＝7 Indicates the thermal insulation material grid; when z=8, (j, k) char＝8 Represents a mesh of insulating materials.

specific Embodiment approach 3

[0038] The difference from the specific embodiment 1 or 2 is that in the numerical simulation method of ingot macrosegregation in this embodiment, the process of obtaining the temperature T distribution inside the ingot grid as described in step 3 is, through the energy conservation equation:

[0039] h s = c PL T, h l = c PL T+△H, [H]=f s h s +(1-f s ) h 1 , to obtain the distribution of temperature T in the ingot:

[0040] ρ L ∂ [ H ] ∂ t + ρ L ▿ · ( c P L U → T + U → Δ H ) = ...

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Abstract

The invention discloses an ingot casting macrosegregation numerical simulation method and belongs to the field of macrosegregation prediction. The problem that macrosegregation formed under the combined action of different physical mechanisms cannot be accurately predicted by existing macrosegregation calculation is solved. The ingot casting macrosegregation numerical simulation method comprises the steps that macroscale mesh generation is carried out on an ingot casting system to form a series of computing grids, and the positions of impurities in the ingot casting system in ingot casting grids are set; for the ingot casting grids, the impurity speed distribution, the cast ingot inner temperature distribution and cast ingot inner average composition distribution are obtained through the energy conservation equation, the composition conservation equation, the momentum conservation equation and the mass conservation equation; for all the computing grids except for the ingot casting grids, the casting grid energy conservation equation is calculated, and the cast grid inner temperature distribution is obtained; after solidification is finished, and the cast ingot inner average composition distribution is output. The ingot casting macrosegregation numerical simulation method accurately predicts macrosegregation formation, and is applicable to prediction of macrosegregation of sand molds and metal molds of various sizes.

Description

technical field [0001] The invention relates to a numerical simulation method for ingot macro-segregation. Background technique [0002] Macrosegregation is a casting defect formed during the solidification of the ingot. Macro segregation is the change of alloy composition on the macro scale, which leads to the inhomogeneity of ingot structure and mechanical properties. The existence of macro-segregation defects weakens the plasticity and impact toughness of ingot products, and it is also the source of hot cracking defects. As a forging base material, the ingot size is usually large. Due to the long solidification time and the long action time of alloy liquid flow, macro segregation defects are easily formed. For large-scale ingot products, once macro-segregation is formed, it is difficult to eliminate it by heat treatment or mechanical processing, which will directly lead to the scrapping of the product and cause huge economic losses. Therefore, controlling the formatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 刘东戎
Owner HARBIN UNIV OF SCI & TECH
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