Grain structure three-dimensional numerical prediction method in molten metal one-way solidification process

A unidirectional solidification and three-dimensional numerical technology, which is applied in the field of metal material processing, can solve the problems of large amount of calculation in three-dimensional numerical prediction, and does not consider the influence of grain growth at the solid-liquid interface, so as to shorten the research and development cycle, increase the calculation speed, and accelerate The effect of regulating progress

Active Publication Date: 2020-12-22
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0006] Aiming at using the three-dimensional cellular automata model to simulate the solidification process of molten metal and perform three-dimensional characterization of the grain structure, the existing simulation calculation methods have a large amount of calculation for three-dime

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  • Grain structure three-dimensional numerical prediction method in molten metal one-way solidification process
  • Grain structure three-dimensional numerical prediction method in molten metal one-way solidification process
  • Grain structure three-dimensional numerical prediction method in molten metal one-way solidification process

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specific Embodiment approach 1

[0035] Specific implementation mode 1. Combination figure 1 As shown, the present invention provides a method for three-dimensional numerical prediction of grain structure in the process of unidirectional solidification of molten metal, comprising:

[0036] Step 1: Set the calculation domain of the assumed unidirectional solidification process of the casting, and select the subdivision step size Δx of the calculation domain in the direction of each coordinate axis in the conventional three-dimensional coordinate system CA , according to the subdivision step size Δx CA Divide grids for the calculation domain and determine the grid ID; assign state variables to each grid based on the grid ID; because it is a one-way solidification process, it is only calculated for castings.

[0037] Step 2: Select the subdivision step size Δx CA Sensitivity test of post-calculation results to grid size:

[0038] Select the subdivision step size Δx of different sizes in order from small to la...

specific Embodiment

[0155] The model alloy is a Ni-based superalloy (Ni-5wt%Nb). The alloy thermophysical parameters and simulation parameters are shown in Table 1. The technical parameters of the unidirectional solidification process are shown in Table 2.

[0156] Table 1 Thermal physical parameters of Ni-5wt%Nb alloy and parameters required for simulation

[0157]

[0158] Table 2 process parameters

[0159]

[0160]

[0161] figure 2 and image 3 The corresponding process parameter one is G=50°C / m, The corresponding parameters are shown in Table 1. The competitive growth of columnar crystals was studied when the grid size was 2.5 μm and 5 μm, respectively. The Euler angles of columnar crystals are (0°, 10°, 0°) and (0°, 30°, 0°), respectively. It can be seen that although the grid size has a certain influence on the final height of the grain growth, it has little effect on the angle of the grain boundary (the angle of the grain boundary is 8.2° and 7.2°, respectively). The a...

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Abstract

The invention discloses a grain structure three-dimensional numerical prediction method in a molten metal one-way solidification process, and belongs to the field of metal material machining. The method aims at solving the problems that an existing simulation calculation method is large in three-dimensional numerical prediction calculation amount and does not consider the influence of solid-liquidinterface energy on grain growth when a three-dimensional cellular automaton model is adopted for simulating the molten metal solidification process and carrying out three-dimensional representationon a grain structure. The method comprises the steps of dividing grids for a computational domain and determining grid identifiers; endowing each grid with a state variable; forming a subdivision steplength confirmation file on the basis of a grid Euler angle calculation result obtained by calculation of each subdivision step length in all time step lengths; calculating to obtain the maximum subdivision step length meeting the requirement; predicting the solidification process of an actual casting, and taking the grids with the same Euler angle in each time step as the same crystal grain. According to the method, the calculation speed of numerical prediction in the actual solidification process is increased.

Description

technical field [0001] The invention relates to a method for three-dimensional numerical prediction of grain structure in the process of unidirectional solidification of molten metal, and belongs to the field of metal material processing. Background technique [0002] The solidification of the molten metal occurs in the cavity, because the temperature of the mold is lower than that of the molten metal, which can effectively conduct the heat of the molten metal, thus promoting the solidification of the molten metal. The solidification of molten metal in the cavity has the characteristics of multi-directional heat dissipation, so a columnar grain structure with large grain boundary misorientation is usually formed. The columnar grain structure with large grain boundary misorientation will cause uneven distribution of mechanical properties of castings. When subjected to unidirectional load, some grain boundaries perpendicular to the load are very likely to become crack sources....

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Application Information

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IPC IPC(8): G06F30/23B22D27/04G06F119/08
CPCB22D27/045G06F30/23G06F2119/08
Inventor 刘东戎浦震鹏赵思聪
Owner HARBIN UNIV OF SCI & TECH
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