Method for predicting distribution of eutectic silicon of aluminum-silicon alloy part
Through the combination of phase field simulation and experiment, the eutectic silicon distribution of aluminum-silicon alloy parts is predicted, which solves the error problem caused by the assumption that the eutectic silicon is the same in the prior art, and achieves more accurate eutectic silicon distribution simulation and process optimization. Reduced costs and cycles.
Patent Information
- Application Number
- CN202411377921.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-01-07
AI Technical Summary
When the prior art predicts the distribution of eutectic silicon in aluminum-silicon alloy parts, it is assumed that the eutectic silicon in each part is the same, resulting in large errors, which cannot accurately reflect the static and dynamic mechanical properties and service environment of the parts, and the differences in the process environment cannot be effectively considered.
Predict the solidification and heat treatment process of aluminum-silicon alloy parts through phase field simulation, combine experiments to obtain the eutectic silicon size, set the phase field simulation boundary, use interpolation method to obtain the eutectic silicon size in different process environments, and assign it to each part of the part one by one , obtain eutectic silicon distribution.
It improves the accuracy of eutectic silicon simulation, conforms to the actual process environment, reduces experimental cycle and cost, provides a wider process optimization guidance, and the results obtained are more reference.
Smart Images
Figure CN119272514A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of eutectic silicon distribution of aluminum-silicon alloy parts, and in particular relates to a method for predicting eutectic silicon distribution of aluminum-silicon alloy parts. Background Art
[0002] The application of aluminum silicon alloy accounts for more than 85% of cast aluminum alloys and is widely used in the manufacture of large thin-walled complex structural parts, such as shell parts, satellite receiver masks, cylinder heads, etc. Eutectic silicon is one of the most critical structures in aluminum silicon alloys, and its aspect ratio is the most important factor affecting the service performance of aluminum silicon alloy parts. The solidification process and heat treatment process of aluminum silicon alloy jointly determine the aspect ratio of eutectic silicon.
[0003] For aluminum-silicon alloy parts, even under the same solidification process, due to the effects of chillers, risers, etc., the specific solidification process environment of each part is not the same, the solidification order is different, and the solidification rate is fast or slow; even under the same heat treatment process, because heat transfer takes time, the specific heat treatment process environment of each part is also different, the time to reach the required temperature is long or short, and the heating and cooling rates are fast or slow. Therefore, the size of eutectic silicon in each part of aluminum-silicon alloy parts is different, but when evaluating aluminum-silicon alloy parts before, it was assumed that the eutectic silicon in each part of the part was the same. The results obtained are not in line with reality and the error is too large. Studying the distribution of eutectic silicon in aluminum-silicon alloy parts is of great significance to the static and dynamic mechanical properties of parts and the evaluation of service environment.
[0004] In the existing comparative literature, the research on eutectic silicon in aluminum-silicon alloy parts can be divided into three categories. The first is to study the eutectic silicon modifier of aluminum-silicon alloy, and improve the morphology of eutectic silicon by adding certain trace elements. The second is to optimize the solidification and heat treatment process of eutectic silicon in aluminum-silicon alloy, and improve the morphology of eutectic silicon through the process. The third is to study the solidification and heat treatment process of aluminum-silicon alloy parts, and improve the distribution of eutectic silicon in parts through the process. In addition, the above studies are all based on experiments and do not involve simulation research on eutectic silicon in aluminum-silicon alloy parts. Summary of the invention
[0005] In view of this, the present invention aims to propose a method for predicting eutectic silicon distribution of aluminum-silicon alloy parts to solve at least one technical problem in the background technology.
[0006] To achieve the above object, the technical solution created by the present invention is implemented as follows:
[0007] The method for predicting eutectic silicon distribution of aluminum-silicon alloy parts comprises the following steps:
[0008] S1: Phase field simulation to predict the solidification and heat treatment process of eutectic silicon in aluminum-silicon alloy parts;
[0009] S2: Using experiments to obtain the eutectic silicon size of the aluminum-silicon alloy parts to be predicted;
[0010] S3: setting a boundary for stopping calculation of the phase field method simulation according to the eutectic silicon size obtained in step S2, and obtaining the eutectic silicon size under the phase field method simulation;
[0011] S4: Use interpolation method to obtain the eutectic silicon size under all processes;
[0012] S5: Obtain the process environment of aluminum-silicon alloy parts;
[0013] S6: Corresponding to the process environment of step five, the eutectic silicon size is assigned to the corresponding parts of the parts one by one to obtain the eutectic silicon distribution of the aluminum-silicon alloy parts.
[0014] Furthermore, the phase field simulation method in step S1 includes constructing a phase field equation for eutectic silicon nucleation growth; solving the phase field equation; and analyzing the solution results of the phase field equation to obtain the solidification and heat treatment process of eutectic silicon nucleation growth.
[0015] Furthermore, in step S2, the eutectic silicon size of the aluminum-silicon alloy part to be predicted is obtained through experiments;
[0016] The experimental steps include: ① cutting experimental samples from aluminum-silicon alloy parts; preparing eutectic silicon samples of aluminum-silicon alloy parts according to the steps specified in GB / T3246.1-2024 and the current GB / T 3246.2-2012; ② observing with a metallographic microscope; ③ counting the observed eutectic silicon size, that is, the eutectic silicon size of the aluminum-silicon alloy part to be predicted.
[0017] Further, the aluminum-silicon alloy part to be predicted is a diesel engine cylinder head;
[0018] And in step S2, the size of eutectic silicon at the nose bridge area, top plate and airway wall of the cylinder head of the aluminum-silicon alloy part to be predicted is obtained.
[0019] Furthermore, in step S4, using the interpolation method to obtain the size of the eutectic silicon under the process includes (specific steps of the difference method are given).
[0020] Furthermore, the eutectic silicon size in steps S1, S3, S4 and S6 is the aspect ratio of the eutectic silicon.
[0021] Furthermore, obtaining the process environment of the aluminum-silicon alloy part in step S5 includes obtaining the temperature of the aluminum-silicon alloy part.
[0022] Compared with the prior art, the method for predicting eutectic silicon distribution of aluminum-silicon alloy parts created by the present invention has the following advantages:
[0023] 1. The stopping boundary of the phase field method for simulating the eutectic phase is the number of calculation steps. After the calculation is completed, the result is checked to determine whether the calculation is correct. The present invention adds a stopping calculation boundary of the eutectic silicon size for the phase field method simulation of aluminum-silicon alloy eutectic silicon. This boundary data comes from the experiment, which makes the phase field method simulation result of aluminum-silicon alloy eutectic silicon more accurate, can correspond to the actual process, and has more practical guiding significance.
[0024] 2. The simulation of eutectic silicon remains at the material level. The present invention develops the simulation of eutectic silicon to the component level, which is more instructive for industrial production.
[0025] 3. In the prior art, when conducting simulation evaluations of the organization and mechanical properties of parts, it is assumed that the eutectic silicon size of each part of the aluminum-silicon alloy part is the same. However, due to different positions and structures, the specific process environment of each part of the part cannot be the same. For example, when the part is placed in a process environment of 100°C, when the surface of the part reaches 100°C, the temperature at the center of the part must not reach 100°C, that is, the temperature change on the surface of the part and the temperature change at the center of the part must be different, which leads to the fact that the eutectic silicon size of each part of the aluminum-silicon alloy part cannot be the same. In the prior art, there is no good way to solve this problem. The present invention determines the eutectic silicon size according to the specific process environment of each part of the aluminum-silicon alloy part. At this time, the eutectic silicon size of each part of the part is different, that is, the eutectic silicon size distribution of the part is obtained, which is more in line with the actual situation, and the obtained results are more meaningful for reference. The present invention determines the eutectic silicon size according to the specific process environment, which is in line with the actual eutectic silicon size distribution of the part and is more instructive.
[0026] 4. The size of eutectic silicon under different processes can only be obtained through experiments, which takes a long time and has high costs. The present invention uses a simulation method to obtain the size of eutectic silicon of aluminum-silicon alloy parts under different processes, which involves a wider range of processes, a shorter cycle, and a lower cost, and has a greater guiding role in process optimization. For the aluminum-silicon alloy ZL702A single cylinder head, it takes about 1 month and costs about 20,000 yuan to produce a cylinder head and conduct experimental analysis on the size of eutectic silicon in various parts; using the present invention, it takes about 2 weeks and costs about 5,000 yuan. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:
[0028] Figure 1 Schematic diagram of the solidification process of eutectic silicon of Example Alloy A (a is the solidification process at 0 steps, b is the solidification process at 9000 steps, and c is the solidification process at 15000 steps);
[0029] Figure 2Schematic diagram of the heat treatment process of eutectic silicon of alloy A in Example (a is the solidification process at 2000 steps, b is the solidification process at 6000 steps, and c is the solidification process at 10000 steps);
[0030] Figure 3 Schematic diagram of eutectic silicon at three locations: the nose bridge area of the cylinder head, the top plate, and the airway wall (a is the nose bridge area of the cylinder head, b is the top plate, and c is the airway wall);
[0031] Figure 4 Schematic diagram of specific process environment of each part of the cylinder head (a is the solidification temperature field of the cylinder head, b is the heat treatment temperature field of the cylinder head);
[0032] Figure 5 The aspect ratio distribution of eutectic silicon in the cylinder head. DETAILED DESCRIPTION
[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.
[0034] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.
[0035] Example:
[0036] The specific composition of the aluminum-silicon alloy is selected as follows: Si: 7.62wt.%, Cu: 1.48wt.%, Mg: 0.35wt.%, Al: balance, hereinafter referred to as alloy A.
[0037] The selected part is specifically a cylinder head of a diesel engine.
[0038] Step 1: Use phase field method to simulate the solidification of eutectic silicon of alloy A ( Figure 1 shown) and heat treatment process ( Figure 2 shown);
[0039] The phase field simulation method includes constructing a phase field equation for the nucleation and growth of eutectic silicon; solving the phase field equation; and analyzing the solution results of the phase field equation to obtain the solidification and heat treatment process of the nucleation and growth of eutectic silicon.
[0040] Step 2: Use experiments to obtain the aspect ratio of eutectic silicon at three locations: the nose bridge area of the cylinder head, the top plate, and the airway wall (such as Figure 3 shown);
[0041] The experimental steps include: ① cutting experimental samples from aluminum-silicon alloy parts; preparing eutectic silicon samples of aluminum-silicon alloy parts according to the steps specified in GB / T3246.1-2024 and the current GB / T 3246.2-2012; ② observing with a metallographic microscope; ③ counting the observed eutectic silicon size, that is, the eutectic silicon size of the aluminum-silicon alloy part to be predicted.
[0042] Step 3: according to the aspect ratio of eutectic silicon in step 2, set the boundary for stopping calculation of phase field simulation, and obtain the aspect ratio of eutectic silicon under phase field simulation;
[0043] Step 4: Use the interpolation method to obtain the aspect ratio of eutectic silicon under all processes;
[0044] Step 5: Obtain the specific process environment of each part of the cylinder head (such as Figure 4 shown);
[0045] Step 6: Corresponding to the specific process environment of step 5, the aspect ratio of eutectic silicon is assigned to the corresponding parts of the parts one by one to obtain the aspect ratio distribution of eutectic silicon in the cylinder head (such as Figure 5 shown).
[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A method for predicting eutectic silicon distribution of aluminum-silicon alloy parts, characterized by: The steps include: S1: Phase field simulation to predict the solidification and heat treatment process of eutectic silicon in aluminum-silicon alloy parts; S2: Using experiments to obtain the eutectic silicon size of the aluminum-silicon alloy parts to be predicted; S3: setting a boundary for stopping calculation of the phase field method simulation according to the eutectic silicon size obtained in step S2, and obtaining the eutectic silicon size under the phase field method simulation; S4: Use interpolation method to obtain the eutectic silicon size under all processes; S5: Obtain the process environment of aluminum-silicon alloy parts; S6: Corresponding to the process environment of step five, the eutectic silicon size is assigned to the corresponding parts of the parts one by one to obtain the eutectic silicon distribution of the aluminum-silicon alloy parts.
2. The method for predicting eutectic silicon distribution of aluminum-silicon alloy parts according to claim 1, characterized in that: The phase field simulation method in step S1 includes constructing a phase field equation for eutectic silicon nucleation growth; solving the phase field equation; and analyzing the solution results of the phase field equation to obtain the solidification and heat treatment process of eutectic silicon nucleation growth.
3. The method for predicting eutectic silicon distribution of aluminum-silicon alloy parts according to claim 1, characterized in that: In step S2, the eutectic silicon size of the aluminum-silicon alloy part to be predicted is obtained through experiments.
4. The method for predicting eutectic silicon distribution of aluminum-silicon alloy parts according to claim 1, characterized in that: The aluminum-silicon alloy part to be predicted is a diesel engine cylinder head; And in step S2, the size of eutectic silicon at the nose bridge area, top plate and airway wall of the cylinder head of the aluminum-silicon alloy part to be predicted is obtained.
5. The method for predicting eutectic silicon distribution of aluminum-silicon alloy parts according to claim 1, characterized in that: In step S4, the interpolation method is used to obtain the size of the eutectic silicon under the process.
6. The method for predicting eutectic silicon distribution of aluminum-silicon alloy parts according to claim 1, characterized in that: The eutectic silicon size in steps S1, S3, S4 and S6 is the aspect ratio of the eutectic silicon.
7. The method for predicting eutectic silicon distribution of aluminum-silicon alloy parts according to claim 1, characterized in that: Acquiring the process environment of the aluminum-silicon alloy part in step S5 includes acquiring the temperature of the aluminum-silicon alloy part.