A method for preparing a microstructure sample for measuring slag of an aluminum alloy ingot

Abstract

The application discloses a preparation method of a microstructure sample for measuring slag of an aluminum alloy ingot. The method comprises the following steps: 1, sawing the aluminum alloy ingot to take the sawing surface as a testing surface and milling the testing surface, and then embedding the sample, wherein the size of the sample after embedding is 30mm; 2, sequentially performing rough grinding, fine grinding, rough polishing, fine polishing and precision polishing, then washing the sample with water, wiping the sample with anhydrous ethanol cotton ball and drying the sample, and the preparation is completed. The application can prepare the microstructure sample for measuring slag of the aluminum alloy ingot, can observe the microstructure of the sample, can test the slag content of the ingot, and can accurately evaluate the casting quality of the ingot. The microstructure sample for measuring slag of the aluminum alloy ingot prepared by the application can obtain a clearer and more accurate microstructure image, can accurately evaluate the quality of the ingot, and can improve the detection efficiency and accuracy. The application is suitable for the preparation of the microstructure sample for measuring slag of the aluminum alloy ingot.

Description

TECHNICAL FIELD

[0001] The application relates to a preparation method of a microscopic structure sample for measuring slag of an aluminum alloy ingot. BACKGROUND

[0002] In an aluminum alloy melting and casting process, the content of slag inclusions in the melt must be reduced as much as possible to ensure the internal quality of the ingot.

[0003] The composition, content and distribution of slag inclusions in the melt after being placed in a static furnace, degassing device and filter box are analyzed by using a PREFIL off-line quantitative analyzer for testing liquid metal and a metallographic analysis testing method. The process of generating slag inclusions in the smelting process and the composition of the slag inclusions can be confirmed through the test, and a solution for reducing the slag inclusion defects in the aluminum alloy ingot is provided. When the aluminum alloy slag content is analyzed by using the metallographic analysis testing method, a high-quality microscopic structure sample needs to be prepared to avoid measurement errors caused by the sample preparation method and affect the evaluation of the ingot quality, so that a preparation method of a microscopic structure sample for measuring slag of an aluminum alloy ingot is developed. SUMMARY

[0004] The application aims to solve the problems in the prior art and provide a preparation method of a microscopic structure sample for measuring slag of an aluminum alloy ingot.

[0005] A preparation method of a microscopic structure sample for measuring slag of an aluminum alloy ingot is realized according to the following steps:

[0006] I. The aluminum alloy ingot is sawed to take the sawing surface as the inspection surface and mill the surface, and then the sample is inlaid. After the sample is inlaid, the size of the sample is 30mm in diameter;

[0007] II. The sample is sequentially subjected to rough grinding, fine grinding, rough polishing treatment, fine polishing treatment and precision polishing treatment, then is washed clean with water, is wiped with anhydrous ethanol cotton ball and is blown dry, so that the preparation of the microscopic structure sample for measuring slag of the aluminum alloy ingot is completed.

[0008] Further, the size of the aluminum alloy ingot after sawing in step I is 20mm*15mm*15mm in length*width*height.

[0009] Further, in step II, the rough grinding is performed by using P300-P500 coarse sandpaper, the automatic grinding time is 2-5min, the BASE rotating speed is 200-300rpm, the HEAD rotating speed is 30-60rpm, and the single-point force value is 10-25N.

[0010] Further, in step II, the fine grinding is performed by using P1100-P1300 fine sandpaper, the automatic grinding time is 2-5min, the BASE rotating speed is 200-300rpm, the HEAD rotating speed is 30-60rpm, and the single-point force value is 10-25N.

[0011] Further, the rough polishing process in step two: the polishing cloth is 9um polishing cloth; the rough polishing agent is 9um high concentration diamond suspension solution; the automatic polishing time is 2-5min, the BASE rotation speed is 200-300rpm, the HEAD rotation speed is 30-60rpm, and the single point force value is 10-25N.

[0012] Further, the fine polishing process in step two: the polishing cloth is 3um polishing cloth; the fine polishing agent is 3um high concentration diamond suspension solution; the automatic polishing time is 2-5min, the BASE rotation speed is 200-300rpm, the HEAD rotation speed is 30-60rpm, and the single point force value is 10-25N.

[0013] Further, the fine polishing process in step two: the polishing cloth is 3um polishing cloth; the fine polishing agent is 3um high concentration diamond suspension solution; the automatic polishing time is 2-5min, the BASE rotation speed is 200-300rpm, the HEAD rotation speed is 30-60rpm, and the single point force value is 10-25N.

[0014] Further, the rough grinding, fine grinding, rough polishing process, fine polishing process and fine polishing process in step two are all operated by using a semi-automatic grinding and polishing machine.

[0015] Further, water is used for cooling and lubrication during the rough grinding and fine grinding in step two, and after completion, the sample is washed with clean water and then subsequent operation is performed.

[0016] In the present application, by means of sample intercepting, face milling, rough grinding, fine grinding, rough polishing, fine polishing, fine polishing, cleaning and other steps, an aluminum alloy ingot slag measuring microstructure sample meeting the inspection requirements is prepared, the microstructure of the sample is observed, the slag type and slag content of the ingot are inspected, and thus the melting and casting quality of the ingot is evaluated.

[0017] The present application solves the problem of high-quality samples used in the evaluation process of aluminum alloy ingots, and prepares an aluminum alloy ingot slag measuring microstructure sample meeting the inspection requirements, observes the microstructure of the sample, inspects the slag content of the ingot, and thus can accurately evaluate the melting and casting quality of the ingot.

[0018] The aluminum alloy ingot slag measuring microstructure sample prepared by the present application can obtain clearer and more accurate microstructure images, can accurately evaluate the quality of the ingot, and improves the detection efficiency and accuracy.

[0019] The present application is suitable for the preparation of an aluminum alloy ingot slag measuring microstructure sample. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the microstructure image of the aluminum alloy ingot slag measuring microstructure sample prepared in the examples.

[0021] Figure 2 The image shows a microstructure obtained using a conventional sample preparation method in the example. Detailed Implementation

[0022] The technical solution of the present invention is not limited to the specific embodiments listed below, but also includes any combination of the specific embodiments.

[0023] Specific Implementation Method 1: This implementation method provides a method for preparing microstructure samples for slag testing of aluminum alloy ingots, which is carried out according to the following steps:

[0024] 1. Sawing aluminum alloy ingots, using the cut surface as the inspection surface and milling the surface, then mounting the sample. The sample size after mounting is φ30mm.

[0025] 2. The above samples were subjected to coarse grinding, fine grinding, coarse polishing, fine polishing and fine polishing in sequence. Then they were rinsed with water, wiped with anhydrous ethanol cotton balls and blown dry. This completed the preparation of microstructure samples for aluminum alloy ingot slag testing.

[0026] In this embodiment, the purpose of milling is to remove saw marks.

[0027] In this embodiment, the purpose of rough grinding is to remove milling marks.

[0028] In this embodiment, the purpose of fine grinding is to remove the marks left by coarse grinding.

[0029] The purpose of the rough polishing process in this embodiment is to eliminate fine grinding marks on the inspection surface.

[0030] The purpose of the fine polishing process in this embodiment is to eliminate the rough polishing marks on the inspection surface.

[0031] The purpose of the fine polishing process in this embodiment is to make the inspection surface bright and free of any marks.

[0032] Specific Implementation Method Two: This implementation method differs from Specific Implementation Method One in that the dimensions of the aluminum alloy ingot after sawing in step one are 20mm × 15mm × 15mm (length × width × height). Everything else is the same as in Specific Implementation Method One.

[0033] Specific Implementation Method Three: This implementation method differs from Specific Implementation Method One in that, in step two, the coarse grinding uses P300 to P500 sandpaper; the automatic grinding time is 2 to 5 minutes; the BASE speed is 200 to 300 rpm; the HEAD speed is 30 to 60 rpm; and the single-point force value is 10 to 25 N. Everything else is the same as in Specific Implementation Method One.

[0034] Specific embodiment four: the difference between this embodiment and the specific embodiment one is that in step two, the fine grinding: fine sand paper is P1100~P1300; automatic grinding time is 2~5min, BASE speed is 200~300rpm, HEAD speed is 30~60rpm, and single point force value is 10~25N. The others are the same as the specific embodiment one.

[0035] Specific embodiment five: the difference between this embodiment and the specific embodiment one is that in step two, the rough polishing treatment: polishing cloth is 9um polishing cloth; rough polishing agent is 9um high concentration diamond suspension solution; automatic grinding time is 2~5min, BASE speed is 200~300rpm, HEAD speed is 30~60rpm, and single point force value is 10~25N. The others are the same as the specific embodiment one.

[0036] In the rough polishing treatment process of this embodiment, the rough polishing agent is immersed on the polishing cloth.

[0037] Specific embodiment six: the difference between this embodiment and the specific embodiment one is that in step two, the fine polishing treatment: polishing cloth is 3um polishing cloth; fine polishing agent is 3um high concentration diamond suspension solution; automatic grinding time is 2~5min, BASE speed is 200~300rpm, HEAD speed is 30~60rpm, and single point force value is 10~25N. The others are the same as the specific embodiment one.

[0038] In the fine polishing treatment process of this embodiment, the fine polishing agent is immersed on the polishing cloth.

[0039] Specific embodiment seven: the difference between this embodiment and the specific embodiment one is that in step two, the fine polishing treatment: polishing cloth is 0.02um polishing cloth; fine polishing agent is 0.02um silicon oxide suspension solution; automatic grinding time is 2~5min, BASE speed is 200~300rpm, HEAD speed is 30~60rpm, and single point force value is 10~25N. The others are the same as the specific embodiment one.

[0040] In the fine polishing treatment process of this embodiment, the fine polishing agent is immersed on the polishing cloth.

[0041] Specific embodiment eight: the difference between this embodiment and the specific embodiment one is that in step two, the rough grinding, fine grinding, rough polishing treatment, fine polishing treatment and fine polishing treatment are all operated by semi-automatic grinding and polishing machine. The others are the same as the specific embodiment one.

[0042] Specific embodiment nine: the difference between this embodiment and the specific embodiment one is that in step two, the rough grinding and fine grinding processes all need to be cooled and lubricated with water, and after completion, they all need to be washed clean with clean water before subsequent operation. The others are the same as the specific embodiment one.

[0043] The beneficial effects of the present application are verified by the following examples:

[0044] Example:

[0045] A preparation method of a microstructure sample for measuring slag of an aluminum alloy ingot is realized according to the following steps:

[0046] I. The aluminum alloy ingot is sawed, the sawed surface is used as the inspection surface, the surface is milled, and then the sample is inlaid. After the sample is inlaid, the size of the sample is φ30mm;

[0047] II. The sample is sequentially subjected to rough grinding, fine grinding, rough polishing treatment, fine polishing treatment, and precision polishing treatment, then is washed with water, is wiped with anhydrous ethanol cotton ball, and is dried, thereby completing the preparation of the microstructure sample for measuring slag of the aluminum alloy ingot.

[0048] In step I of the example, the size of the aluminum alloy ingot after sawing is 20mm×15mm×15mm.

[0049] In step II of the example, the rough grinding is performed by using P400 coarse sandpaper, the automatic grinding time is 3min, the BASE rotation speed is 260rpm, the HEAD rotation speed is 60rpm, and the single-point force value is 15N.

[0050] In step II of the example, the fine grinding is performed by using P1200 fine sandpaper, the automatic grinding time is 3min, the BASE rotation speed is 260rpm, the HEAD rotation speed is 60rpm, and the single-point force value is 15N.

[0051] In step II of the example, the rough polishing treatment is performed by using 9um polishing cloth and 9um high-concentration diamond suspension solution, the automatic grinding time is 3min, the BASE rotation speed is 260rpm, the HEAD rotation speed is 60rpm, and the single-point force value is 25N.

[0052] In step II of the example, the fine polishing treatment is performed by using 3um polishing cloth and 3um high-concentration diamond suspension solution, the automatic grinding time is 3min, the BASE rotation speed is 260rpm, the HEAD rotation speed is 60rpm, and the single-point force value is 25N.

[0053] In step II of the example, the precision polishing treatment is performed by using 0.02um polishing cloth and 0.02um silicon oxide suspension solution, the automatic grinding time is 3min, the BASE rotation speed is 260rpm, the HEAD rotation speed is 60rpm, and the single-point force value is 25N.

[0054] In step II of the example, the rough grinding, the fine grinding, the rough polishing treatment, the fine polishing treatment, and the precision polishing treatment are all performed by using a semi-automatic grinding and polishing machine.

[0055] The rough grinding and fine grinding in step two of the embodiment need to be cooled and lubricated by water, and after completion, they need to be washed with clean water and then subsequent operations are carried out.

[0056] The microstructure image of the microstructure sample of the aluminum alloy ingot prepared in the embodiment is shown in Figure 3. Figure 1 As shown in the image, the morphology of the phase and the morphology of the slag are clearly visible, the matrix is clean, and each phase and the slag are easy to distinguish, so that the microstructure inspection work can be smoothly carried out; the microstructure image of the microstructure sample of the aluminum alloy ingot prepared by using the conventional sample preparation method is shown in Figure 4. Figure 2 As shown in the image, the morphology of the phase is relatively clear, the morphology of the slag is blurred, and the matrix is not clean, which affects the slag discrimination and greatly influences the detection result.

[0057] Therefore, the microstructure sample of the aluminum alloy ingot prepared by using the method of the embodiment can obtain a more clear and accurate microstructure image, so that the aluminum alloy ingot slag detection work can be smoothly carried out, the quality of the ingot can be accurately evaluated, and the detection efficiency and accuracy are improved.

Claims

1. A method of preparing a microstructure sample for slag detection of an aluminum alloy ingot, characterized by It is implemented in the following steps: I. Sawing aluminum alloy ingot, taking the cut surface as the test surface and milling the surface, then embedding the sample, the size of the sample after embedding is φ30mm; II. The above sample is sequentially subjected to rough grinding, fine grinding, rough polishing treatment, fine polishing treatment and precision polishing treatment, then washed with water, wiped with anhydrous ethanol cotton ball and dried, thereby completing the preparation of the microstructure sample for measuring slag of aluminum alloy ingot; The size of the aluminum alloy ingot after sawing in step I is 20mm×15mm×15mm; In step II, the rough grinding: the coarse sandpaper is P400; the automatic grinding time is 3min, the BASE speed is 260rpm, the HEAD speed is 60rpm, and the single-point force value is 15N; In step II, the fine grinding: the fine sandpaper is P1200; the automatic grinding time is 3min, the BASE speed is 260rpm, the HEAD speed is 60rpm, and the single-point force value is 15N; In step II, the rough polishing treatment: the polishing cloth is 9um polishing cloth; the rough polishing agent is 9um high-concentration diamond suspension solution; the automatic grinding time is 3min, the BASE speed is 260rpm, the HEAD speed is 60rpm, and the single-point force value is 25N; In step II, the fine polishing treatment: the polishing cloth is 3um polishing cloth; the fine polishing agent is 3um high-concentration diamond suspension solution; the automatic grinding time is 3min, the BASE speed is 260rpm, the HEAD speed is 60rpm, and the single-point force value is 25N; In step II, the precision polishing treatment: the polishing cloth is 0.02um polishing cloth; the precision polishing agent is 0.02um silicon oxide suspension solution; the automatic grinding time is 3min, the BASE speed is 260rpm, the HEAD speed is 60rpm, and the single-point force value is 25N; In step II, the rough grinding, fine grinding, rough polishing treatment, fine polishing treatment and precision polishing treatment are all operated by using a semi-automatic grinding and polishing machine; In the process of rough grinding and fine grinding in step II, water is needed for cooling and lubrication, and after completion, the sample is washed with clean water and then subjected to subsequent operation.

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