CN113528903A - 5052 aluminum alloy with high bending performance and preparation method thereof - Google Patents
5052 aluminum alloy with high bending performance and preparation method thereof Download PDFInfo
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 143
- 238000005452 bending Methods 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000007670 refining Methods 0.000 claims abstract description 32
- 239000012535 impurity Substances 0.000 claims abstract description 26
- 238000005097 cold rolling Methods 0.000 claims abstract description 25
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 22
- 239000000956 alloy Substances 0.000 claims abstract description 22
- 238000000137 annealing Methods 0.000 claims abstract description 22
- 238000005098 hot rolling Methods 0.000 claims abstract description 20
- 238000003723 Smelting Methods 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 238000005096 rolling process Methods 0.000 claims abstract description 14
- 238000005520 cutting process Methods 0.000 claims abstract description 13
- 238000000265 homogenisation Methods 0.000 claims abstract description 12
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 7
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 238000007872 degassing Methods 0.000 claims abstract description 5
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- 238000004321 preservation Methods 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 238000007667 floating Methods 0.000 claims description 4
- 230000004907 flux Effects 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000003921 oil Substances 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 239000010731 rolling oil Substances 0.000 claims description 4
- 238000004513 sizing Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000011777 magnesium Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 229910018134 Al-Mg Inorganic materials 0.000 description 1
- 229910018467 Al—Mg Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- 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
- C22F1/047—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 magnesium as the next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B2003/001—Aluminium or its alloys
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to 5052 aluminum alloy with high bending performance and a preparation method thereof, and belongs to the field of aluminum alloy processing. The method comprises the steps of material preparation, smelting, degassing and impurity removal, online refining, homogenization, hot rolling, cold rolling, withdrawal and straightening, box type annealing and transverse cutting; wherein, the alloy raw material is prepared according to the following alloy elements and mass percentages, Si is less than or equal to 0.1 percent, Fe: 0.15-0.25%, Cu is less than or equal to 0.10%, Mn is less than or equal to 0.1%, Mg: 2.5-2.7%, Cr: 0.2-0.25%, Zn is less than or equal to 0.1%, Ti: 0.005-0.017 percent of single impurity, less than or equal to 0.05 percent of impurity, less than or equal to 0.15 percent of impurity in total, and the balance of Al, and reasonably regulates Mg element and reduces the content of Fe element as impurity; the homogenization and heating system is 540 ℃/6h +480 ℃/2h, the initial rolling temperature is 470 ℃, the total processing deformation is 95-98%, the hot rolling final rolling temperature is controlled at 325 +/-10 ℃, a reasonable homogenization system and hot rolling pass processing rate are established, the purpose of refining grains is achieved, and the condition of poor surface quality caused by yield phenomenon in the process of rolling deformation of the aluminum alloy strip is eliminated.
Description
Technical Field
The invention belongs to the field of aluminum alloy processing, and relates to 5052 aluminum alloy with high bending performance and a preparation method thereof.
Background
The 5xxx series Al-Mg alloy belongs to non-heat treatment strengthening type aluminum alloy, Mg is the main alloy element, and the main strengthening means is solid solution strengthening and work hardening. The 5xxx series aluminum alloy is more applied to the fields of automobiles and aerospace due to higher strength and good corrosion resistance, and the 5xxx series aluminum alloy is also commonly adopted as a structural member, a pipeline and a framework for ships and railway vehicles. The 5052 aluminum alloy is an alloy with low magnesium content in the 5xxx series alloy, cannot be strengthened by heat treatment, and has good corrosion resistance. The aluminum alloy has many applications in automobiles, and is mainly used for bumpers, chassis members, interior trim parts, automobile body covering parts and the like.
However, 5052 aluminum alloy often has defects such as a luders line, delayed yield, and orange peel texture during the solution strengthening process. When the alloy is plastically deformed, Mg atoms dissolved in the matrix interact with dislocation, and the alloy often has obvious yield phenomenon, so that the Luders strip which damages the surface quality of a stamping part occurs in the stamping process. If the alloy rolling or annealing heat treatment process is unreasonable, alloy grains are coarse, abnormally-grown grains exist locally, and orange peel tissue defects are easy to appear on the surface of a stamping part when the alloy is stamped and formed, even the stamping part cracks, and the use condition of a product is seriously influenced. Therefore, for the 5052 aluminum alloy, the content of Mg and the grain size must be controlled on the premise of ensuring the strength performance of the alloy, so as to obtain a 5052 alloy plate with high bending performance.
Disclosure of Invention
In view of this, the present invention provides a 5052 aluminum alloy with high bending performance and a preparation method thereof, so as to solve the defects of the existing 5052 aluminum alloy.
In order to achieve the purpose, the invention provides the following technical scheme:
an 5052 aluminum alloy with high bending performance comprises, by mass, not more than 0.1% of Si, Fe: 0.15-0.25%, Cu is less than or equal to 0.10%, Mn is less than or equal to 0.1%, Mg: 2.5-2.7%, Cr: 0.2-0.25%, Zn is less than or equal to 0.1%, Ti: 0.005-0.017%, less than or equal to 0.05% of single impurity, less than or equal to 0.15% of impurity in total, and the balance of Al.
A preparation method of 5052 aluminum alloy with high bending performance comprises the following steps:
s1, material preparation: preparing an aluminum alloy raw material according to the following alloy elements and mass percentages, wherein Si is less than or equal to 0.1%, Fe: 0.15-0.25%, Cu is less than or equal to 0.10%, Mn is less than or equal to 0.1%, Mg: 2.5-2.7%, Cr: 0.2-0.25%, Zn is less than or equal to 0.1%, Ti: 0.005-0.017 percent of single impurity, less than or equal to 0.05 percent of single impurity, less than or equal to 0.15 percent of impurity in total, and the balance of Al;
s2, smelting: adding the prepared aluminum alloy raw material into a smelting furnace, uniformly mixing, smelting to obtain an aluminum alloy melt, wherein the smelting temperature is 730-750 ℃, then pouring the smelted aluminum alloy melt into a refining furnace for refining, the refining temperature is 720-740 ℃, the refining time is 20min, and the refined aluminum alloy melt stands for 20min at the temperature of 720 +/-5 ℃;
s3, degassing and removing impurities: introducing high-purity argon into the refined aluminum alloy melt, stirring the aluminum alloy melt, removing impurity gases in the aluminum alloy melt, and filtering the degassed aluminum alloy melt through a foamed ceramic filter plate at the filtering temperature of 720 +/-5 ℃;
s4, online refining: adding an Al-Ti-B wire refiner into the degassed and impurity-removed aluminum alloy melt for online refining, and casting the online refined aluminum alloy melt into a 5052 aluminum alloy cast ingot;
s5, homogenization: homogenizing and heating the aluminum alloy cast ingot after online refining in a push type heating furnace, wherein the homogenization and heating system is 540 ℃/6h +480 ℃/2h, and discharging the aluminum alloy cast ingot after heat preservation is finished for hot rolling;
s6, hot rolling: rolling the aluminum alloy cast ingot into an aluminum alloy strip with the thickness of 4.0-6.0 mm by using a hot rolling roughing mill and a finishing mill, wherein the initial rolling temperature is 470 ℃, the total processing deformation is 95-98%, and the hot rolling finishing temperature is controlled at 325 +/-10 ℃;
s7, cold rolling: and (2) cold rolling the aluminum alloy strip by using a cold rolling mill, wherein the thickness of the aluminum alloy strip after the cold rolling is 3.0-4.0 mm, the cold rolling pass is 2 times, the first pass working ratio is 20%, and the total cold rolling working ratio is 30.0%.
S8, withdrawal and straightening: and cleaning and straightening the cold-rolled aluminum alloy strip in a straightening and withdrawing process, wherein the straightening elongation is 0.4-0.6%.
S9, box annealing: and (3) carrying out heat preservation for 2h on the cleaned and straightened aluminum alloy strip within the temperature range of 200-320 ℃, and determining a proper box type annealing system.
S10, transverse cutting: and (4) utilizing a transverse cutting machine to carry out sizing, saw cutting and packaging on the annealed aluminum alloy strip according to the specified size.
Further, in step S2, the prepared aluminum alloy raw materials are sequentially put into a melting furnace for melting, and refined and covered by a flux, and after the materials are put into the melting furnace, stirring is started when molten aluminum appears in the furnace, and the molten aluminum is melted into an aluminum alloy melt after the molten aluminum is uniformly stirred.
Further, in step S3, the degassed aluminum alloy melt is filtered through a ceramic foam filter plate with a pore size of not less than 50ppi to control the purity.
Further, in the step S8, the cleaning treatment mode is alkaline cleaning, which cleans rolling oil and floating aluminum on the surface of the aluminum alloy strip and prevents oil spots from appearing on the surface of the aluminum alloy strip during the annealing process.
The invention has the beneficial effects that:
(1) according to the invention, the novel 5052 aluminum alloy with high bending performance is obtained by optimizing the mass percentage of each element of the aluminum alloy raw material. The key point is that on the premise of ensuring the alloy strength, the Mg element is reasonably regulated and controlled, the content of the impurity Fe element is reduced, and the impurity Fe element is easy to form a indissolvable compound with Mn and Cr, so that the effects of Mn and Cr are reduced. When the alloy contains a large amount of iron-rich compounds, processing cracks are easily generated, so that the content of the impurity Fe element in the alloy needs to be controlled.
(2) The invention establishes a reasonable homogenization system and hot rolling pass processing rate to increase the dislocation density in the alloy during the rolling process and improve the recrystallization driving force, and then the fine and dispersedly distributed particles are pinned with subcrystal boundaries or crystal boundaries through proper annealing system treatment to block recrystallization nucleation and grain growth, thereby finally achieving the purpose of refining the grains and eliminating the poor surface quality caused by yield phenomenon during the rolling deformation process of the aluminum alloy strip.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Example 1:
a preparation method of 5052-H32 aluminum alloy with high bending performance comprises the following steps:
s1, material preparation: preparing an aluminum alloy raw material according to the following alloy elements in percentage by mass:
| element(s) | Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti | Al |
| Content (wt.) | 0.065 | 0.181 | 0.002 | 0.01 | 2.62 | 0.215 | 0.017 | 0.017 | Balance of |
S2, smelting: the prepared aluminum alloy raw materials are sequentially put into a smelting furnace to be smelted, a flux is used for refining and covering, stirring is started after molten aluminum appears in the furnace, the molten aluminum is smelted into an aluminum alloy melt after being stirred uniformly, the smelting temperature is 750 ℃, then the smelted aluminum alloy melt is poured into a refining furnace to be refined, the refining temperature is 730 ℃, the refining time is 20min, and the refined aluminum alloy melt is kept stand for 20min at 720 ℃;
s3, degassing and removing impurities: introducing high-purity argon into the refined aluminum alloy melt, stirring the aluminum alloy melt, removing impurity gases in the aluminum alloy melt, and filtering the degassed aluminum alloy melt through a foamed ceramic filter plate with the aperture being more than or equal to 50ppi, wherein the filtering temperature is 720 ℃;
s4, online refining: adding an Al-Ti-B wire refiner into the degassed and impurity-removed aluminum alloy melt for online refining, and casting the online refined aluminum alloy melt into a 5052 aluminum alloy cast ingot;
s5, homogenization: homogenizing and heating the aluminum alloy cast ingot after online refining in a push type heating furnace, wherein the homogenization and heating system is 540 ℃/6h +480 ℃/2h, and discharging the aluminum alloy cast ingot after heat preservation is finished for hot rolling;
s6, hot rolling: rolling the aluminum alloy cast ingot into an aluminum alloy strip with the thickness of 5.7mm by using a hot rolling roughing mill and a finishing mill, wherein the initial rolling temperature is 470 ℃, the total processing deformation is 95%, and the hot rolling finishing temperature is controlled at 319 ℃;
s7, cold rolling: and (2) cold rolling the aluminum alloy strip by using a cold rolling mill, wherein the thickness of the aluminum alloy strip after the cold rolling is 4.0mm, the cold rolling pass is 2 times, the first pass working ratio is 20%, and the total cold rolling working ratio is 30.0%.
S8, withdrawal and straightening: and (3) performing alkali washing and straightening treatment on the cold-rolled aluminum alloy strip in a straightening and withdrawing process, cleaning rolling oil and floating aluminum on the surface of the aluminum alloy strip, preventing oil spots from appearing on the surface of the aluminum alloy strip in the annealing process, and achieving the straightening elongation of 0.5%.
S9, box annealing: and (3) carrying out heat preservation for 2h on the cleaned and straightened aluminum alloy strip within the temperature range of 200-320 ℃, and determining a proper box type annealing system.
S10, transverse cutting: and (4) utilizing a transverse cutting machine to carry out sizing, saw cutting and packaging on the annealed aluminum alloy strip according to the specified size.
Example 2:
a preparation method of 5052-H32 aluminum alloy with high bending performance comprises the following steps:
s1, material preparation: preparing an aluminum alloy raw material according to the following alloy elements in percentage by mass:
| element(s) | Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti | Al |
| Content (wt.) | 0.065 | 0.181 | 0.002 | 0.01 | 2.62 | 0.215 | 0.017 | 0.017 | Balance of |
S2, smelting: the prepared aluminum alloy raw materials are sequentially put into a smelting furnace to be smelted, a flux is used for refining and covering, stirring is started after molten aluminum appears in the furnace, the molten aluminum is smelted into an aluminum alloy melt after being stirred uniformly, the smelting temperature is 750 ℃, then the smelted aluminum alloy melt is poured into a refining furnace to be refined, the refining temperature is 730 ℃, the refining time is 20min, and the refined aluminum alloy melt is kept stand for 20min at 720 ℃;
s3, degassing and removing impurities: introducing high-purity argon into the refined aluminum alloy melt, stirring the aluminum alloy melt, removing impurity gases in the aluminum alloy melt, and filtering the degassed aluminum alloy melt through a foamed ceramic filter plate with the aperture being more than or equal to 50ppi, wherein the filtering temperature is 720 ℃;
s4, online refining: adding an Al-Ti-B wire refiner into the degassed and impurity-removed aluminum alloy melt for online refining, and casting the online refined aluminum alloy melt into a 5052 aluminum alloy cast ingot;
s5, homogenization: homogenizing and heating the aluminum alloy cast ingot after online refining in a push type heating furnace, wherein the homogenization and heating system is 540 ℃/6h +480 ℃/2h, and discharging the aluminum alloy cast ingot after heat preservation is finished for hot rolling;
s6, hot rolling: rolling the aluminum alloy cast ingot into an aluminum alloy strip with the thickness of 4.3mm by using a hot rolling roughing mill and a finishing mill, wherein the initial rolling temperature is 470 ℃, the total processing deformation is 98 percent, and the hot rolling finishing temperature is controlled at 321 ℃;
s7, cold rolling: and (2) cold rolling the aluminum alloy strip by using a cold rolling mill, wherein the thickness of the aluminum alloy strip after the cold rolling is 3mm, the cold rolling pass is 2 times, the first pass working ratio is 20%, and the total cold rolling working ratio is 30.0%.
S8, withdrawal and straightening: and (3) performing alkali washing and straightening treatment on the cold-rolled aluminum alloy strip in a straightening and withdrawing process, cleaning rolling oil and floating aluminum on the surface of the aluminum alloy strip, preventing oil spots from appearing on the surface of the aluminum alloy strip in the annealing process, and achieving the straightening elongation of 0.6%.
S9, box annealing: and (3) carrying out heat preservation for 2h on the cleaned and straightened aluminum alloy strip within the temperature range of 200-320 ℃, and determining a proper box type annealing system.
S10, transverse cutting: and (4) utilizing a transverse cutting machine to carry out sizing, saw cutting and packaging on the annealed aluminum alloy strip according to the specified size.
Comparative example 1:
the difference between the comparative example 1 and the example 1 is that the aluminum alloy raw material in the step S1 comprises the following elements in percentage by mass:
| element(s) | Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti | Al |
| Content (wt.) | 0.072 | 0.321 | 0.005 | 0.023 | 2.626 | 0.238 | 0.014 | 0.016 | Balance of |
Comparative example 2:
the difference between the comparative example 2 and the example 1 is that the aluminum alloy raw material in the step S1 comprises the following elements in percentage by mass:
| element(s) | Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti | Al |
| Content (wt.) | 0.067 | 0.294 | 0.016 | 0.067 | 2.575 | 0.228 | 0.014 | 0.015 | Balance of |
Comparative example 3:
the difference between the comparative example 3 and the example 1 is that the aluminum alloy raw material in the step S1 comprises the following elements in percentage by mass:
| element(s) | Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti | Al |
| Content (wt.) | 0.061 | 0.278 | 0.003 | 0.044 | 2.663 | 0.228 | 0.012 | 0.014 | Balance of |
Tables 1 to 5 show the mechanical properties and bending properties of 5052 aluminum alloy strips provided in examples 1 to 2 and comparative examples 1 to 3 after annealing at different temperatures for 2 hours. Wherein the mechanical property is tested according to GB/T16865 sampling, the bending property is tested according to GB/T232 sampling, the bending radius is 0.5T, and T is the sample thickness.
TABLE 1 mechanical and bending Properties of the aluminum alloy strip of example 1 after annealing at different temperatures for 2h
TABLE 2 mechanical and bending Properties of the aluminum alloy strip of example 2 after annealing at different temperatures for 2h
TABLE 3 mechanical and bending properties of the aluminum alloy strip of comparative example 1 after annealing at different temperatures for 2h
TABLE 4 mechanical and bending properties of the aluminum alloy strip of comparative example 2 after annealing at different temperatures for 2h
TABLE 5 mechanical properties and bending properties of comparative example 3 aluminum alloy strip after annealing at different temperatures for 2h
The comparison of the detection results in tables 1-5 shows that after the heat preservation treatment is carried out for 2 hours at the temperature of 200-280 ℃ in examples 1-2 and comparative examples 1-3, the mechanical properties of the aluminum alloy strips meet the standard requirements of 5052-H32 aluminum alloy, but the bending detection results of the aluminum alloy strips provided in comparative examples 1-3 have cracks, and the bending property is unqualified. When the annealing temperature is higher than 280 ℃, the aluminum alloy strip begins to recrystallize, the mechanical property of the aluminum alloy strip is greatly reduced and is lower than the requirement of the state of 5052-H32, and no crack occurs in the bending property of the aluminum alloy strip in the embodiment 1-2. Compared with comparative examples 1-3, the aluminum alloy strips provided by examples 1-2 have the same qualified bending performance and show better bending performance on the basis of meeting the mechanical properties.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (5)
1. The utility model provides a 5052 aluminum alloy with high bending performance which characterized in that: according to the mass percentage, the alloy comprises Si less than or equal to 0.1 percent, Fe: 0.15-0.25%, Cu is less than or equal to 0.10%, Mn is less than or equal to 0.1%, Mg: 2.5-2.7%, Cr: 0.2-0.25%, Zn is less than or equal to 0.1%, Ti: 0.005-0.017%, less than or equal to 0.05% of single impurity, less than or equal to 0.15% of impurity in total, and the balance of Al.
2. A preparation method of 5052 aluminum alloy with high bending performance is characterized by comprising the following steps: the method comprises the following steps:
s1, material preparation: preparing an aluminum alloy raw material according to the following alloy elements and mass percentages, wherein Si is less than or equal to 0.1%, Fe: 0.15-0.25%, Cu is less than or equal to 0.10%, Mn is less than or equal to 0.1%, Mg: 2.5-2.7%, Cr: 0.2-0.25%, Zn is less than or equal to 0.1%, Ti: 0.005-0.017 percent of single impurity, less than or equal to 0.05 percent of single impurity, less than or equal to 0.15 percent of impurity in total, and the balance of Al;
s2, smelting: adding the prepared aluminum alloy raw material into a smelting furnace, uniformly mixing, smelting to obtain an aluminum alloy melt, wherein the smelting temperature is 730-750 ℃, then pouring the smelted aluminum alloy melt into a refining furnace for refining, the refining temperature is 720-740 ℃, the refining time is 20min, and the refined aluminum alloy melt stands for 20min at the temperature of 720 +/-5 ℃;
s3, degassing and removing impurities: introducing high-purity argon into the refined aluminum alloy melt, stirring the aluminum alloy melt, removing impurity gases in the aluminum alloy melt, and filtering the degassed aluminum alloy melt through a foamed ceramic filter plate at the filtering temperature of 720 +/-5 ℃;
s4, online refining: adding an Al-Ti-B wire refiner into the degassed and impurity-removed aluminum alloy melt for online refining, and casting the online refined aluminum alloy melt into a 5052 aluminum alloy cast ingot;
s5, homogenization: homogenizing and heating the aluminum alloy cast ingot after online refining in a push type heating furnace, wherein the homogenization and heating system is 540 ℃/6h +480 ℃/2h, and discharging the aluminum alloy cast ingot after heat preservation is finished for hot rolling;
s6, hot rolling: rolling the aluminum alloy cast ingot into an aluminum alloy strip with the thickness of 4.0-6.0 mm by using a hot rolling roughing mill and a finishing mill, wherein the initial rolling temperature is 470 ℃, the total processing deformation is 95-98%, and the hot rolling finishing temperature is controlled at 325 +/-10 ℃;
s7, cold rolling: and (2) cold rolling the aluminum alloy strip by using a cold rolling mill, wherein the thickness of the aluminum alloy strip after the cold rolling is 3.0-4.0 mm, the cold rolling pass is 2 times, the first pass working ratio is 20%, and the total cold rolling working ratio is 30.0%.
S8, withdrawal and straightening: and cleaning and straightening the cold-rolled aluminum alloy strip in a straightening and withdrawing process, wherein the straightening elongation is 0.4-0.6%.
S9, box annealing: and (3) carrying out heat preservation for 2h on the cleaned and straightened aluminum alloy strip within the temperature range of 200-320 ℃, and determining a proper box type annealing system.
S10, transverse cutting: and (4) utilizing a transverse cutting machine to carry out sizing, saw cutting and packaging on the annealed aluminum alloy strip according to the specified size.
3. The preparation method of 5052 aluminum alloy with high bending performance according to claim 2, wherein: and step S2, sequentially putting the prepared aluminum alloy raw materials into a smelting furnace for smelting, refining and covering by using a flux, starting stirring when molten aluminum appears in the furnace after the materials are put into the smelting furnace, and smelting the molten aluminum alloy into an aluminum alloy melt after the molten aluminum is uniformly stirred.
4. The preparation method of 5052 aluminum alloy with high bending performance according to claim 2, wherein: in step S3, the degassed aluminum alloy melt is filtered through a foamed ceramic filter plate with the pore diameter not less than 50ppi to control the purity.
5. The preparation method of 5052 aluminum alloy with high bending performance according to claim 2, wherein: in the step S8, the cleaning treatment mode is alkaline cleaning, rolling oil and floating aluminum on the surface of the aluminum alloy strip are cleaned, and oil spots on the surface of the aluminum alloy strip in the annealing process are prevented.
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| CN114457265A (en) * | 2022-01-28 | 2022-05-10 | 河南明晟新材料科技有限公司 | High-strength high-fatigue-performance 6-series aluminum alloy, gas cylinder and preparation method of gas cylinder |
| CN115011849A (en) * | 2022-05-13 | 2022-09-06 | 天津忠旺铝业有限公司 | 5-series aluminum alloy plate rolling process |
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