CN114561576A - On-line quenching easily-extruded ultrahigh-strength aluminum alloy and manufacturing method and application thereof - Google Patents
On-line quenching easily-extruded ultrahigh-strength aluminum alloy and manufacturing method and application thereof Download PDFInfo
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 50
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000010791 quenching Methods 0.000 title claims abstract description 24
- 230000000171 quenching effect Effects 0.000 title claims abstract description 24
- 230000032683 aging Effects 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 238000003723 Smelting Methods 0.000 claims abstract description 8
- 238000004321 preservation Methods 0.000 claims description 22
- 238000005266 casting Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 238000001125 extrusion Methods 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 229910052748 manganese Inorganic materials 0.000 claims description 9
- 229910052725 zinc Inorganic materials 0.000 claims description 9
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 238000009499 grossing Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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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
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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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
- C22F1/053—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 zinc as the next major constituent
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- Crystallography & Structural Chemistry (AREA)
- Extrusion Of Metal (AREA)
Abstract
The invention relates to the technical field of aluminum alloy section bar manufacturing, in particular to an online quenching easily-extruded ultrahigh-strength aluminum alloy and a manufacturing method and application thereof. The manufacturing method comprises the following steps: (1) smelting according to the composition of 7 series aluminum alloy elements to obtain an ingot; (2) heating the cast ingot and extruding; (3) carrying out water-cooling on-line quenching on the section, wherein the upper part and the lower part of the section are respectively 80 percent, and the strength is 100 percent; (4) carrying out aging treatment on the section, and discharging and air cooling after the aging treatment; the manufacturing method adopts on-line quenching to produce the 7-series aluminum alloy, shortens the production period of the product, has high tensile strength, and can be widely applied to manufacturing of 3C product appearance pieces.
Description
Technical Field
The invention relates to the technical field of aluminum alloy section bar manufacturing, in particular to an online quenching easily-extruded ultrahigh-strength aluminum alloy and a manufacturing method and application thereof.
Background
At present, with the stimulation on equipment requirements brought by replacement and innovation of inventory equipment of the tablet computer and the notebook computer, the tablet computer and the notebook computer still have considerable market development space. The density of the aluminum alloy is about one third of that of the stainless steel, and the aluminum alloy is easier to be colored, so that the aluminum alloy can meet the requirements of light weight, thinness and personalized development of smart phones, tablet computers and the like. Therefore, the development of intelligent products is of great significance to drive the demand for aluminum structural members.
The 1013 aluminum alloy has a good anodic oxidation appearance effect, and is widely applied to manufacturing of appearance parts of smart phones at present. However, the 1013 aluminum alloy has low strength and yield strength of about 220MPa, which is not beneficial to improving the pressure resistance or drop resistance of the mobile phone, thereby limiting the light and thin design requirement of the smart phone using 1013 aluminum alloy as an appearance piece.
The 7-series aluminum alloy has higher strength and can be applied to the manufacture of structural parts with higher strength requirements. However, the conventional offline quenching process of the 7-series aluminum alloy is complicated and has poor corrosion resistance, and the material texture defect, namely a fibrous defect distributed along the extrusion direction, is more likely to occur in comparison with the 1013 alloy after anodic oxidation, so that the wide application of the 7-series aluminum alloy in the aspect of manufacturing of appearance parts of smart phones is limited.
Accordingly, there is a need for a process for producing a 7-series aluminum alloy for a 3C product exterior member which has a good balance among strength, elongation and surface flatness.
Disclosure of Invention
Aiming at the technical problems of complicated offline quenching process and poor appearance of the 7-series aluminum alloy, the invention provides the easily extruded ultrahigh-strength aluminum alloy by online quenching and the manufacturing method and application thereof.
In a first aspect, the invention provides a method for manufacturing an online quenching easily extruded ultrahigh-strength aluminum alloy, which comprises the following steps:
(1) smelting according to the composition of 7 series aluminum alloy elements to obtain an ingot;
(2) heating the ingot casting and extruding, wherein the ingot casting speed is 2-3m/min, the temperature of an extrusion cylinder is 430-440 ℃, the temperature of a die is 484-444 ℃, the heat preservation time of the die is 8-12h, and then the obtained section is preserved for 20-24h at 340 ℃ in a low-temperature furnace;
(3) carrying out water-cooling on-line quenching on the section, wherein the upper part and the lower part of the section are respectively 80 percent, and the strength is 100 percent;
(4) and carrying out aging treatment on the section, wherein the aging treatment comprises a first stage and a second stage, the heating temperature of the first stage is 110-.
Furthermore, the 7-series aluminum alloy comprises the following elements by mass percent of Si less than or equal to 0.24%, Fe less than or equal to 0.3%, Cu: 0.14-0.44%, Mn less than or equal to 0.3%, Mg: 1.4-2.4%, Cr is less than or equal to 0.1%, Zn: 4 to 1.4 percent of Ti, less than or equal to 0.1 percent of Ti, less than or equal to 0.04 percent of other elements, less than or equal to 0.14 percent of the total, and the balance of Al.
Further, the 7-series aluminum alloy comprises the following elements in percentage by mass: 0.11%, Fe: 0.20%, Cu: 0.37%, Mn: 0.18%, Mg: 1.47%, Cr: 0.04%, Zn: 4.81%, Ti: 0.02 percent, less than or equal to 0.04 percent of other elements, less than or equal to 0.14 percent of the total, and the balance of Al.
Further, in the step (2), the ingot is heated to 410-.
Further, in the step (2), the ingot casting is heated to 424 ℃, the ingot casting speed is 2.4m/min, the temperature of the extrusion cylinder is 444 ℃, the temperature of the die is 444 ℃, and the heat preservation time of the die is 10 hours.
Further, in the step (4), the heating temperature in the first stage is 120 ℃, and the heating temperature in the second stage is 110 ℃.
In a second aspect, the present invention provides an ultra-high strength aluminum alloy produced by the above-described production method.
In a third aspect, the invention provides an application of the ultrahigh-strength aluminum alloy in the field of manufacturing of 3C product appearance pieces.
The invention has the beneficial effects that:
the temperature and heat preservation time parameters defined in the extrusion forming procedure in the step (2) are beneficial to the development of subsequent work of products, and the problem of difficult extrusion forming is not easy to occur; the on-line quenching process defined in the step (3) is simple, so that the formed cooling speed is ensured, the flatness of the section is ensured, and the defects of bending and the like are avoided; the aging and discharging air cooling process of the section defined in the step (4) can effectively enhance the tensile strength of the aluminum alloy.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
Example 1
An online quenching easily-extruded ultrahigh-strength aluminum alloy comprises the following elements in percentage by mass: 0.12%, Fe: 0.14%, Cu: 0.24%, Mn: 0.20%, Mg: 1.41%, Cr: 0.07%, Zn: 4.43%, Ti: 0.02 percent, less than or equal to 0.04 percent of other elements, less than or equal to 0.14 percent of the total, and the balance of Al;
the preparation method of the ultrahigh-strength aluminum alloy comprises the following steps:
(1) smelting according to the element composition of the aluminum alloy to obtain an ingot;
(2) heating the ingot to 410 ℃ and extruding, wherein the ingot casting speed is 2.4m/min, the extrusion cylinder temperature is 430 ℃, the mold temperature is 484 ℃, the mold heat preservation time is 10h, and then the obtained section is subjected to heat preservation for 24h at 340 ℃ in a low-temperature furnace;
(3) carrying out water-cooling on-line quenching on the section, wherein the upper part and the lower part of the section are respectively 80 percent, and the strength is 100 percent;
(4) and carrying out aging treatment on the section, wherein the aging treatment comprises a first stage and a second stage, the heating temperature of the first stage is 110 ℃, the heat preservation time is 12 hours, the temperature of the second stage is increased to 140 ℃, the heat preservation time is 8 hours, and the section is taken out of the furnace and air-cooled after the aging treatment.
Example 2
An online quenching easily-extruded ultrahigh-strength aluminum alloy comprises the following elements in percentage by mass: 0.11%, Fe: 0.20%, Cu: 0.31%, Mn: 0.18%, Mg: 1.74%, Cr: 0.07%, Zn: 4.34%, Ti: 0.02 percent, less than or equal to 0.04 percent of other elements, less than or equal to 0.14 percent of the total, and the balance of Al;
the preparation method of the ultrahigh-strength aluminum alloy comprises the following steps:
(1) smelting according to the element composition of the aluminum alloy to obtain an ingot;
(2) heating the cast ingot to 414 ℃ and extruding, wherein the ingot casting speed is 2.4m/min, the extruding cylinder temperature is 434 ℃, the die temperature is 440 ℃, the die heat preservation time is 12h, and then preserving the heat of the obtained section for 24h at 340 ℃ in a low-temperature furnace;
(3) carrying out water-cooling on-line quenching on the section, wherein the upper part and the lower part of the section are respectively 80 percent, and the strength of the section is 100 percent;
(4) and (3) carrying out aging treatment on the section, wherein the aging treatment comprises a first stage and a second stage, the heating temperature of the first stage is 112 ℃, the heat preservation time is 12 hours, the temperature of the second stage is increased to 142 ℃, the heat preservation time is 8 hours, and the section is taken out of the furnace and air-cooled after the aging treatment.
Example 3
An online quenching easily-extruded ultrahigh-strength aluminum alloy comprises the following elements in percentage by mass: 0.11%, Fe: 0.20%, Cu: 0.31%, Mn: 0.18%, Mg: 1.43%, Cr: 0.04%, Zn: 4.73%, Ti: 0.02 percent, less than or equal to 0.04 percent of other elements, less than or equal to 0.14 percent of the total, and the balance of Al;
the preparation method of the ultrahigh-strength aluminum alloy comprises the following steps:
(1) smelting according to the element composition of the aluminum alloy to obtain an ingot;
(2) heating the ingot to 420 ℃ and extruding, wherein the ingot casting speed is 2.4m/min, the extruding cylinder temperature is 440 ℃, the die heat preservation time is 12h, and then preserving the heat of the obtained section for 24h at 340 ℃ in a low-temperature furnace;
(3) carrying out water-cooling on-line quenching on the section, wherein the upper part and the lower part of the section are respectively 80 percent, and the strength is 100 percent;
(4) and (3) carrying out aging treatment on the section, wherein the aging treatment comprises a first stage and a second stage, the heating temperature of the first stage is 114 ℃, the heat preservation time is 12 hours, the temperature of the second stage is increased to 144 ℃, the heat preservation time is 8 hours, and the section is taken out of the furnace and air-cooled after the aging treatment.
Example 4
An online quenching easily-extruded ultrahigh-strength aluminum alloy comprises the following elements in percentage by mass: 0.11%, Fe: 0.20%, Cu: 0.37%, Mn: 0.18%, Mg: 1.47%, Cr: 0.04%, Zn: 4.81%, Ti: 0.02 percent, less than or equal to 0.04 percent of other elements, less than or equal to 0.14 percent of the total, and the balance of Al;
the preparation method of the ultrahigh-strength aluminum alloy comprises the following steps:
(1) smelting according to the element composition of the aluminum alloy to obtain an ingot;
(2) heating the ingot to 424 ℃ and extruding, wherein the ingot casting speed is 2.4m/min, the extrusion cylinder temperature is 444 ℃, the die heat preservation time is 10h, and then preserving the heat of the obtained section for 20h at 340 ℃ in a low-temperature furnace;
(3) carrying out water-cooling on-line quenching on the section, wherein the upper part and the lower part of the section are respectively 80 percent, and the strength is 100 percent;
(4) and carrying out aging treatment on the section, wherein the aging treatment comprises a first stage and a second stage, the heating temperature of the first stage is 120 ℃, the heat preservation time is 12 hours, the temperature of the second stage is increased to 110 ℃, the heat preservation time is 8 hours, and the section is taken out of the furnace and air-cooled after the aging treatment.
Comparative example 1
An online quenching easily-extruded ultrahigh-strength aluminum alloy comprises the following elements in percentage by mass: 0.11%, Fe: 0.20%, Cu: 0.37%, Mn: 0.18%, Mg: 1.47%, Cr: 0.04%, Zn: 4.81%, Ti: 0.02 percent, less than or equal to 0.04 percent of other elements, less than or equal to 0.14 percent of the total, and the balance of Al;
the preparation method of the ultrahigh-strength aluminum alloy comprises the following steps:
(1) smelting according to the composition of aluminum alloy elements to obtain an ingot;
(2) heating the cast ingot to 430 ℃ and extruding, wherein the ingot casting speed is 2.4m/min, the extruding cylinder temperature is 440 ℃, the die temperature is 444 ℃, the die heat preservation time is 12h, and then the obtained section is preserved for 20h at 340 ℃ in a low-temperature furnace;
(3) carrying out water-cooling on-line quenching on the section, wherein the upper part and the lower part of the section are 100 percent respectively, and the strength of the section is 100 percent;
(4) and carrying out aging treatment on the section, wherein the aging treatment comprises a first stage and a second stage, the heating temperature of the first stage is 120 ℃, the heat preservation time is 12 hours, the temperature of the second stage is increased to 110 ℃, the heat preservation time is 8 hours, and the section is taken out of the furnace and air-cooled after the aging treatment.
The aluminum alloys of examples 1 to 4 and comparative example 1 were examined and the results are shown in table 1 below.
TABLE 1 test results
| Item | Tensile strength/MPa | Elongation/percent | Case of section bar (surface) |
| Example 1 | 422 | 412 | Surface smoothing |
| Example 2 | 434 | 414 | Surface smoothing |
| Example 3 | 440 | 480 | Surface smoothing |
| Example 4 | 444 | 484 | Surface smoothing |
| Comparative example 1 | 442 | 478 | The surface is slightly curved |
It can be seen that the aluminum alloy prepared by the method has high tensile strength, proper elongation and good surface flatness of the profile, and is suitable for being used as an appearance piece of a 3C product.
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention.
Claims (8)
1. The method for manufacturing the on-line quenching easily extruded ultrahigh-strength aluminum alloy is characterized by comprising the following steps of:
(1) smelting according to the composition of 7 series aluminum alloy elements to obtain an ingot;
(2) heating the ingot casting and extruding, wherein the ingot casting speed is 2-3m/min, the temperature of an extrusion cylinder is 430-450 ℃, the temperature of a die is 485-495 ℃, the heat preservation time of the die is 8-12h, and then the obtained section is preserved for 20-24h at 350 ℃ in a low-temperature furnace;
(3) carrying out water-cooling on-line quenching on the section, wherein the upper part and the lower part of the section are respectively 80 percent, and the strength is 100 percent;
(4) and (3) carrying out aging treatment on the section, wherein the aging treatment comprises a first stage and a second stage, the heating temperature in the first stage is 110-120 ℃, the heat preservation time is 12h, the temperature in the second stage is increased to 150-160 ℃, the heat preservation time is 8h, and the section is taken out of the furnace and is cooled by air after the aging treatment.
2. The production method according to claim 1, wherein the 7-series aluminum alloy has an element composition of, in mass%, Si ≦ 0.25%, Fe ≦ 0.3%, Cu: 0.15-0.45%, Mn is less than or equal to 0.3%, Mg: 1.5-2.5%, Cr is less than or equal to 0.1%, Zn: 5 to 6.5 percent of Ti, less than or equal to 0.1 percent of Ti, less than or equal to 0.05 percent of other elements, less than or equal to 0.15 percent of the total, and the balance of Al.
3. The production method according to claim 1, wherein the 7-series aluminum alloy has an element composition of, in mass percent, Si: 0.16%, Fe: 0.20%, Cu: 0.37%, Mn: 0.18%, Mg: 1.97%, Cr: 0.05%, Zn: 5.81%, Ti: 0.02 percent, less than or equal to 0.05 percent of other elements, less than or equal to 0.15 percent of the total, and the balance of Al.
4. The method as claimed in claim 1, wherein in step (2), the ingot is heated to 510-530 ℃.
5. The manufacturing method according to claim 1, wherein in the step (2), the ingot is heated to 525 ℃, the ingot speed is 2.5m/min, the extrusion barrel temperature is 445 ℃, the mold temperature is 495 ℃, and the mold holding time is 10 hours.
6. The manufacturing method according to claim 1, wherein in the step (4), the heating temperature in the first stage is 120 ℃ and the heating temperature in the second stage is 160 ℃.
7. An ultra-high strength aluminum alloy produced by the production method as recited in any one of claims 1 to 6.
8. Use of the ultra-high strength aluminum alloy of claim 7 in the field of 3C product appearance part manufacture.
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| CN202210201896.4A CN114561576A (en) | 2022-03-02 | 2022-03-02 | On-line quenching easily-extruded ultrahigh-strength aluminum alloy and manufacturing method and application thereof |
| PCT/CN2022/094906 WO2023165032A1 (en) | 2022-03-02 | 2022-05-25 | Online quenching-based easily-extruded ultra-high-strength aluminum alloy, and manufacturing method therefor and application thereof |
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| CN202210201896.4A CN114561576A (en) | 2022-03-02 | 2022-03-02 | On-line quenching easily-extruded ultrahigh-strength aluminum alloy and manufacturing method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115491556A (en) * | 2022-09-22 | 2022-12-20 | 四川福蓉科技股份公司 | Armored aluminum profile and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2012207302A (en) * | 2011-03-16 | 2012-10-25 | Kobe Steel Ltd | METHOD FOR MANUFACTURING EXTRUDED MATERIAL OF HEAT TREATMENT TYPE Al-Zn-Mg-BASED ALUMINUM ALLOY |
| JP6344816B2 (en) * | 2013-08-30 | 2018-06-20 | 株式会社Uacj | High-strength aluminum alloy extruded thin section and method for producing the same |
| CN104624684A (en) * | 2015-01-09 | 2015-05-20 | 广西南南铝加工有限公司 | Extrusion production process of Al-Zn-Mg alloy profile for high-speed rail car body |
| CN107326227A (en) * | 2017-08-14 | 2017-11-07 | 山东南山铝业股份有限公司 | Rail transit vehicle body skirtboard aluminium alloy extrusions and its manufacture method |
| CN108220845A (en) * | 2017-12-29 | 2018-06-29 | 西南铝业（集团）有限责任公司 | A kind of solid solution aging technique of the strong 7 line aluminium alloy material of superelevation for heavy haul train draw bar |
| CN109136689B (en) * | 2018-10-22 | 2019-09-10 | 广西平果百矿高新铝业有限公司 | A kind of Al-Zn-Mg-Cu ultra-high-strength aluminum alloy and its crushing failure at high speed press quenching production method |
| CN109554560A (en) * | 2018-12-05 | 2019-04-02 | 辽宁忠旺集团有限公司 | A kind of production method of aerospace 7 line aluminium alloy profile of superhigh intensity |
| CN111020316B (en) * | 2019-12-20 | 2020-08-28 | 福建祥鑫股份有限公司 | High-performance 7XXX aluminum alloy capable of being quenched on line and preparation method thereof |
| CN111218591B (en) * | 2020-02-28 | 2020-09-15 | 福建祥鑫股份有限公司 | Preparation method of high-strength and high-toughness 7XXX aluminum alloy section for new energy automobile power system |
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| CN115491556A (en) * | 2022-09-22 | 2022-12-20 | 四川福蓉科技股份公司 | Armored aluminum profile and preparation method thereof |
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Application publication date: 20220531 |