CN112410692A - 2219 aluminum alloy grain refining process - Google Patents
2219 aluminum alloy grain refining process Download PDFInfo
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- CN112410692A CN112410692A CN202011365269.1A CN202011365269A CN112410692A CN 112410692 A CN112410692 A CN 112410692A CN 202011365269 A CN202011365269 A CN 202011365269A CN 112410692 A CN112410692 A CN 112410692A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/057—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with copper as the next major constituent
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Abstract
The invention discloses a process method for refining 2219 aluminum alloy grains, which comprises the steps of sequentially extruding and thermally treating an O-state 2219 aluminum alloy plate and then chilling, so that the grains of the 2219 aluminum alloy plate are refined to 20 microns from 400 microns; the preparation method has the advantages of simple preparation process, low cost and easy industrial popularization.
Description
Technical Field
The invention relates to the field of metal surface treatment, in particular to a process method for refining grains of 2219 aluminum alloy.
Background
The 2219 aluminum alloy is Al-Cu series high-strength aluminum alloy, has good high and low temperature mechanical property, fracture toughness, stress corrosion resistance and welding performance, and is mostly processed by 2219 aluminum alloy plates in the prior aerospace vehicle parts.
The O-state thick 2219 aluminum alloy plate used at present is generally coarse in grains, the grain size exceeds 400 mu m, and the plasticity, the stress corrosion resistance and the welding performance of the O-state thick plate are greatly reduced.
Disclosure of Invention
The invention aims to provide a novel process for processing 2219 aluminum alloy, so that the grain size in the aluminum alloy is only 20 mu m.
In order to achieve the purpose, the invention adopts the following technical scheme:
a process method for refining grains of 2219 aluminum alloy comprises the following three steps:
s1, extruding and deforming the 2219 aluminum alloy plate along the thickness of the plate;
s2, putting the extruded and deformed plate into a closed furnace for heat treatment;
s3: and (4) chilling the heat-treated plate.
In the scheme, the extrusion rate in the extrusion process of S1 is 0.1-10 mm/min, and the deformation amount of the extruded sheet is 10-100%.
In the scheme, the plate is an O-shaped 2219 aluminum alloy plate with the thickness of 7-16 mm.
In the above scheme, the heat treatment process is as follows:
s21, heating the air in the closed furnace, and keeping the temperature of the air between 500 and 540 ℃;
s22: and (4) quickly placing the extruded and deformed plate into a heated closed furnace, and storing for 10-100 min.
In the scheme, the plate after heat treatment is quickly placed into water at the temperature of 10-50 ℃.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the process method can recrystallize the 2219 aluminum alloy plate crystal grains, the uniform equiaxial crystal grains with the size of being refined from 400 mu m to 20 mu m can obtain the fine crystal strengthening effect, the comprehensive performance of the material is obviously improved, and the process method has outstanding beneficial effects;
the preparation method has great advancement and innovation, simple process and low cost, and is easy for industrialized popularization.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a metallographic microscopic image of an O-state 2219 aluminum alloy plate with a thickness of 7.5mm in the rolling direction;
FIG. 2 is a metallographic micrograph obtained in example 1 of the present invention;
FIG. 3 is a metallographic micrograph obtained in example 2 of the present invention;
FIG. 4 is a metallographic micrograph obtained in example 3 of the present invention.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Example 1
An O-shaped 2219 aluminum alloy plate with the thickness of 7.5mm is selected and cut into a square block with the size of 100mm multiplied by 100mm, a metallographic microscopic picture in the rolling direction of an original plate is shown in a figure 1, and the length of an original crystal grain is more than 400 mu m.
A100T press is selected, the extrusion speed is 0.5mm/min, 20% of deformation amount is extruded in the thickness direction of the plate, and the thickness is extruded to 6 mm. Heating the plate to 535 deg.C in an air furnace, placing the extruded plate in the air furnace, keeping the temperature for 90min, and quickly cooling the plate in 20 deg.C tap water after the heat treatment. The metallographic micrograph of the refined aluminum alloy sheet is shown in figure 2, and the fibrous grains of the 2219 aluminum alloy sheet are recovered and recrystallized, the grains are refined to 75 mu m, and the grain size is reduced by about 4 times compared with the original sheet (figure 1).
Example 2
An O-shaped 2219 aluminum alloy plate with the thickness of 12.5mm is selected and cut into a square block with the size of 100mm multiplied by 100 mm. A500T press is selected, the extrusion speed is 1mm/min, 40% of deformation amount is extruded in the thickness direction of the plate, and the thickness is extruded to be 7.5 mm. Heating the plate to 525 ℃ in an air furnace, putting the extruded and deformed plate into the air furnace, preserving the heat for 40min, and quickly putting the plate into tap water of 30 ℃ for cooling after the heat treatment is finished. The metallographic micrograph of the refined grain processed is shown in figure 3, and it can be seen from the figure that the fibrous grains of the 2219 aluminum alloy plate are subjected to recovery recrystallization, the grains are refined to 40 μm, and the grain size is reduced by about 10 times compared with the original plate (figure 1).
Example 3
An O-shaped 2219 aluminum alloy plate with the thickness of 16mm is selected and cut into a square block with the size of 100mm multiplied by 100 mm. A2000T press is selected, the extrusion speed is 5mm/min, 62.5% of deformation amount is extruded in the thickness direction of the plate, and the thickness is extruded to be 6 mm. Heating the plate to 515 ℃ in an air furnace, putting the extruded and deformed plate into the air furnace, preserving the heat for 20min, and quickly putting the plate into tap water of 35 ℃ for cooling after the heat treatment is finished. The metallographic microscopic picture of the refined grain processed is shown in figure 4, and it can be seen from the figure that the fibrous grains of the 2219 aluminum alloy plate are subjected to recovery recrystallization, the grains are refined to 20 μm, and the grain size is reduced by about 20 times compared with the original plate (figure 1).
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (5)
1. A process method for refining grains of 2219 aluminum alloy is characterized by comprising three steps:
s1, extruding and deforming the 2219 aluminum alloy plate along the thickness of the plate;
s2, putting the extruded and deformed plate into a closed furnace for heat treatment;
s3: and (4) chilling the heat-treated plate.
2. The process method for refining grains of 2219 aluminum alloy as claimed in claim 1, wherein the extrusion rate in the extrusion process of S1 is 0.1-10 mm/min, and the deformation of the extruded sheet is 10-100%.
3. The process method for refining the grains of the 2219 aluminum alloy as claimed in claim 1 or 2, wherein the plate is an O-state 2219 aluminum alloy plate with the thickness of 7-16 mm.
4. The process method for refining grains of 2219 aluminum alloy as claimed in claim 1, wherein the heat treatment process is as follows:
s21, heating the air in the closed furnace, and keeping the temperature of the air between 500 and 540 ℃;
s22: and (4) quickly placing the extruded and deformed plate into a heated closed furnace, and storing for 10-100 min.
5. The process method for refining the grains of the 2219 aluminum alloy as claimed in claim 1 or 4, wherein the heat-treated plate is rapidly put into water at 10-50 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011365269.1A CN112410692A (en) | 2020-11-28 | 2020-11-28 | 2219 aluminum alloy grain refining process |
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| CN202011365269.1A CN112410692A (en) | 2020-11-28 | 2020-11-28 | 2219 aluminum alloy grain refining process |
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Application publication date: 20210226 |