CN113981338A - Control method of iron-rich aluminum alloy structure - Google Patents
Control method of iron-rich aluminum alloy structure Download PDFInfo
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- 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
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- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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Abstract
The invention belongs to the technical field of metal material processing engineering, and particularly relates to a control method of an iron-rich aluminum alloy structure. Controlling the components of a plate blank (Fe 1.10-1.80%, Si 0.10-0.15%, Cu ≦ 0.05%, Mn ≦ 0.05%, Ti ≦ 0.05%, Mg ≦ 0.005%, Zn ≦ 0.005%, and the balance Al and impurities), a cast-rolled grain structure (grain size is grade I-II), a cold rolling and foil rolling process, and homogenizing annealing, wherein the grain size is controlled to be 15-30 mu m, and the second phase is 0.2 mu m2～0.5μm2The structure control of the iron-rich aluminum alloy is realized; the invention not only solves the problems of mechanical property, surface quality and thinner foil rolling of the iron-rich aluminum foil, but also organically combines the mechanical property and the forming property and optimizes the raw materialThe production process has very important significance in improving the service performance and reducing the cost.
Description
Technical Field
The invention belongs to the technical field of metal material processing engineering, and particularly relates to a control method of an iron-rich aluminum alloy structure.
Background
The aluminum foil is a rolled aluminum material with the thickness of less than or equal to 0.2mm, has the advantages of corrosion resistance, moisture resistance, air tightness, light shielding and the like, and is widely applied to the fields of packaging, heat transmission, electronic and electric appliances, buildings, transportation and the like all over the world. In recent years, with the increase of the consumption of aluminum foil and the continuous expansion of the application range of aluminum foil, the requirements of aluminum foil, such as ultra-thin, high strength, high toughness, low pinhole degree and good plate shape, are continuously increased, and the achievement of the performance or technical requirements is not easy to control the production process of the aluminum foil, and the microstructure of the aluminum foil plays a decisive role in controlling the performance or technical requirements. The iron element in the iron-rich 8-series aluminum alloy can refine grains, improve the toughness of the aluminum foil, has the advantages of mechanical property and foil rolling, and can be rolled to single-zero or double-zero foil, thereby being widely used for packaging, lithium battery materials and the like.
The mechanical property and the forming property of the aluminum foil have great relation with the structure, and good forming property needs a series of requirements of uniform crystal grains, sufficiently dispersed second phase distribution, uniform size and shape, random texture, good surface shape, no defect in the structure and the like. The iron-rich aluminum alloy is generally an 8-series aluminum alloy, and the main additive elements include elements such as Si and Cu in addition to Fe. A large number of researches show that Fe element not only has the function of refining grains, but also influences the mechanical property of the aluminum foil through a second phase. Fe exists in the form of solid solution atoms or a second phase in the aluminum alloy, the solid solubility of Fe in the aluminum alloy is very limited and is only 0.05 wt% at normal temperature, most Fe exists in the form of the second phase containing Fe, the Fe-containing compounds in the aluminum alloy are generally two, the first is a ternary (AlFeSi) phase and can be divided into two types, one type is an alpha (AlFeSi) phase with higher Fe-Si atoms, and the shape of the Chinese character is obvious,the crystal grows in a tightly wound mode with alpha-Al and is not easy to crack a matrix, and the other type is a beta (AlFeSi) phase with the iron-silicon atomic ratio of about 1 and exists in a disc shape or a short rod shape generally. The second is a binary AlFe phase, which represents Al3Fe, the most stable form of existence of the second phase of ferro-aluminium, the rest being also a significant proportion of ferro-aluminium compared to the different metastable phases. The shape, the size and the distribution of the second phase containing Fe not only influence the mechanical property and the forming property of the aluminum foil, but also determine the pinhole degree of the aluminum foil. If the second phase is controlled improperly, the quality of the finished aluminum foil is seriously affected. In addition, many factors affecting the structure of the iron-rich aluminum alloy, such as chemical components, casting process, rolling process, heat treatment system and the like, have great influence on the structure.
In conclusion, the method for controlling the structure of the iron-rich aluminum alloy, which is simple and easy to operate, is provided, the problems of mechanical property, surface quality and thinner foil rolling of the iron-rich aluminum foil are solved well, and the mechanical property and the forming property are organically combined, so that an optimized production process is provided for production enterprises, the problems existing in the preparation of the iron-rich aluminum foil are solved, and the method has very important significance in improving the service performance and reducing the cost.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a structure control method of iron-rich aluminum alloy, thereby controlling the mechanical property, starting from the control of slab components, cast-rolling grain structure, cold rolling and foil rolling process, homogenizing annealing and final annealing system based on the micro-alloy precipitation and phase change principle, and effectively solving the structure control mechanism of iron-rich aluminum alloy produced by cast-rolling blanks by using the existing equipment and optimization process, thereby achieving the high strengthening and toughening requirements of aluminum foil and meeting the usability requirements of aluminum foil products such as packaging, lithium batteries and the like.
The invention is realized by the following technical scheme:
(1) aluminum alloy smelting and refining:
controlling the mass percentages of the chemical components of the iron-rich aluminum alloy as follows: 1.10-1.80% of Fe, 0.10-0.15% of Si, less than or equal to 0.05% of Cu, less than or equal to 0.05% of Mn, less than or equal to 0.05% of Ti, less than or equal to 0.005% of Mg, less than or equal to 0.005% of Zn, and the balance of Al and inevitable impurities;
after the raw materials are mixed according to the components, the molten aluminum with the temperature of 685-705 ℃ is obtained after the technological processes of smelting, slagging-off, detection, refining, standing, degassing and deslagging;
(2) double-roller continuous cast-rolling plate coil
Casting and rolling the aluminum liquid obtained in the step (1) to obtain a cast-rolled coil blank; the specification is 7.8-10 mm multiplied by 1200mm multiplied by Lmm; the longitudinal plane parallel to the rolling direction has crystal grains with length-to-length axis ratio of 6-10 and crystal grain area of 3500-4500 μm2；
(3) Cogging and cold rolling: cogging and cold rolling the cast-rolled coil blank obtained in the step (2), and obtaining an intermediate plate coil with the thickness of 6.8-8.0 mm through the machining rate of 25-30%;
(4) intermediate homogenizing annealing
Putting the intermediate plate coil obtained in the step (3) into an annealing furnace, controlling the temperature to be between 530 and 580 ℃, and controlling the grain size of the annealed intermediate plate coil to be between 250 and 400 mu m;
(5) cold rolling and foil rolling
Cold rolling the intermediate plate coil annealed in the step (4) to the thickness of 0.3-0.6 mm, and foil rolling to 35-45 mu m to obtain a foil with the finished thickness; wherein the total processing rate of cold rolling and foil rolling is controlled between 98.5 percent and 99.5 percent;
(6) annealing the finished product
Annealing the finished product of the foil rolled in the step (5); the temperature of the finished product is controlled between 280 ℃ and 340 ℃ during annealing, the grain size is controlled between 15 mu m and 30 mu m, and the second phase is controlled between 0.2 mu m2～0.5μm2To (c) to (d); and the structure control of the iron-rich aluminum alloy is realized after the finished product is annealed.
Further, in the step (1), the iron-rich aluminum alloy is controlled to have the following chemical components in percentage by mass: 1.1-1.50% of Fe, 0.10-0.12% of Si, less than or equal to 0.05% of Cu, less than or equal to 0.05% of Mn, less than or equal to 0.05% of Ti, less than or equal to 0.005% of Mg, less than or equal to 0.005% of Zn, and the balance of Al and inevitable impurities.
Further, in the step (2), the specification of the cast-rolled coil blank is 9.0-10 mm × 1200mm × Lmm.
Further, in the step (5), when the intermediate plate coil is cold-rolled to a thickness of 0.34mm to 0.5mm, the intermediate plate coil is foil-rolled to 45 μm.
Further, in the step (6), the grain size is controlled to be 15 to 20 μm.
Further, in the step (6), the second phase is controlled to be 0.24 μm2～0.3μm2In the meantime.
The invention has the beneficial effects that:
aiming at controlling the structure of the iron-rich 8-series aluminum alloy, the invention realizes the breakthrough of the key production technology; solves the process difficulty of producing the iron-rich 8 series aluminum foil by adopting cast-rolling blanks and explores the structure control mechanism of the iron-rich 8 series aluminum alloy. Controlling the grain size of the structure between 15 and 30 mu m and controlling the second phase to be 0.2 to 0.5 mu m in average size by controlling the content of Fe element, the cold rolling assembly yield, the homogenization annealing system and the finished product annealing system2And finally the final mechanical properties of the product, i.e. the tensile strength sigmabThe elongation delta is more than or equal to 22 percent under the pressure of 110-120 MPa. So that the aluminum foil can meet the requirements of aluminum foil production and use.
In conclusion, the method for controlling the structure of the iron-rich 8-series aluminum alloy provided by the invention explores a structure control mechanism of the iron-rich 8-series aluminum alloy, solves the key technology of producing the iron-rich 8-series aluminum foil by adopting a casting and rolling method, meets the performance required by the production and use of the aluminum foil, stabilizes the key process of supplying blanks by adopting the iron-rich 8-series aluminum alloy casting and rolling method in China, and has higher economic benefit and use value.
Drawings
FIG. 1 is a 100-fold metallographic structure morphology diagram of an iron-rich 8-series aluminum alloy prepared in example 2 of the present invention;
FIG. 2 (c) and (d) are respectively a 100-fold metallographic structure morphology diagram after the homogenization annealing in examples 1 and 2 of the present invention;
FIG. 3 is a diagram (a) showing the microstructure of the second phase after the aluminum foil is annealed at 280 ℃ in example 1 of the present invention, and (b) showing the statistical view of the microstructure of the second phase;
FIG. 4 is a graph (a) showing the microstructure of the second phase after the aluminum foil is annealed at 320 ℃ in example 2 of the present invention, and (b) showing the statistical view of the microstructure of the second phase.
Detailed Description
The invention is further elucidated with reference to the embodiments and the drawings of the description. The invention is further illustrated below with reference to the examples. The examples are given solely for the purpose of illustration and are not intended to limit the invention in any manner.
Example 1:
(1) aluminum alloy smelting and refining
Controlling the mass percentages of the chemical components of the iron-rich aluminum alloy as follows: 1.10 percent of Fe, 0.12 percent of Si, less than or equal to 0.05 percent of Cu, less than or equal to 0.05 percent of Mn, less than or equal to 0.05 percent of Ti, less than or equal to 0.005 percent of Mg, less than or equal to 0.005 percent of Zn, and the balance of Al and inevitable impurities.
(2) Double-roller continuous cast-rolling plate coil
Casting and rolling the aluminum liquid obtained in the step (1) by a double-roller continuous casting and rolling machine to obtain a cast and rolled blank; specification is 9.0
1200mm × Lmm; the grain size is I-II grade grain size; along the longitudinal plane parallel to the rolling direction, the crystal grain length-to-axis ratio is 6-10; the area of the crystal grain is 3500-4500 μm2；
(3) Cogging cold rolling intermediate homogenizing annealing: cogging and cold rolling the cast-rolled plate coil obtained in the step (2), and obtaining an intermediate plate coil with the thickness of 7.2mm through the machining rate of 25-30%;
(4) putting the intermediate plate coil obtained in the step (3) into an annealing furnace, controlling the metal temperature at 530 ℃, and controlling the grain size of the intermediate plate coil to be 250-400 mu m after annealing;
(5) cold rolling and foil rolling
Cold rolling the intermediate plate coil annealed in the step (4) to the thickness of 0.34mm, and then foil rolling to 45 mu m; obtaining a foil with the thickness of a finished product; wherein the total processing rate of cold rolling and foil rolling is controlled between 98.5 percent and 99.5 percent;
(6) annealing the finished product
Annealing the finished product of the foil rolled in the step (5); the metal temperature is controlled to 280 ℃ during the annealing of the finished product, the microstructure and statistics of the second phase of the aluminum foil are shown in figure 3, the grain size is controlled to be 15 mu m on average, and the second phase size is 0.24 mu m on average2。
According to the steps, the structure control of the iron-rich aluminum alloy is realized, and the mechanical properties of the obtained aluminum foil are as follows: tensile Strength σbAt 110MPa, the elongation delta is more than or equal to 22 percent.
Example 2:
(1) aluminum alloy smelting and refining
Controlling the mass percentages of the chemical components of the iron-rich aluminum alloy as follows: 1.5 percent of Fe, 0.10 percent of Si, less than or equal to 0.05 percent of Cu, less than or equal to 0.05 percent of Mn, less than or equal to 0.05 percent of Ti, less than or equal to 0.005 percent of Mg, less than or equal to 0.005 percent of Zn, and the balance of Al and inevitable impurities.
(2) Double-roller continuous cast-rolling plate coil
Casting and rolling the aluminum liquid obtained in the step (1) by a double-roller continuous casting and rolling machine to obtain a cast and rolled blank; the specification is 9.0-10 mm multiplied by 1200mm multiplied by Lmm; the grain size is I-II grade grain size; rolling the longitudinal surface in parallel to the direction, wherein the ratio of the long axis to the short axis of crystal grains is 6-10; the area of the crystal grain is 3500-4500 μm2；
(3) Cogging cold rolling intermediate homogenizing annealing: cogging and cold rolling the cast-rolled plate coil obtained in the step (2), and obtaining an intermediate plate coil with the thickness of 7.2mm through the machining rate of 25-30%;
(4) putting the intermediate plate coil obtained in the step (3) into an annealing furnace, controlling the metal temperature to be 530-580 ℃, and controlling the grain size of the annealed intermediate plate coil to be 250-400 mu m;
(5) cold rolling and foil rolling
Cold rolling the intermediate plate coil annealed in the step (4) to the thickness of 0.3-0.6 mm, and foil rolling to 45 microns; obtaining a foil with the thickness of a finished product; wherein the total processing rate of cold rolling and foil rolling is controlled between 98.5 percent and 99.5 percent;
(6) annealing the finished product
Annealing the finished product of the foil rolled in the step (5); the metal temperature is controlled to 340 ℃ during the annealing of the finished product, the microstructure and statistics of the second phase of the aluminum foil are shown in figure 4, the average grain size is controlled to be 20 mu m, and the average second phase size is 0.27 mu m2。
According to the steps, the structure control of the iron-rich aluminum alloy is realized, and the mechanical properties of the obtained aluminum foil are as follows: tensile Strength σbElongation at 117MPaδ≥23％。
Description of the drawings: the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention; thus, while the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted; all such modifications and variations are intended to be included herein within the scope of this disclosure and the present invention and protected by the following claims.
Claims (6)
1. The method for controlling the structure of the iron-rich aluminum alloy is characterized by comprising the following steps of:
(1) smelting and refining the aluminum alloy;
controlling the mass percentages of the chemical components of the iron-rich aluminum alloy as follows: 1.10-1.80% of Fe, 0.10-0.15% of Si, less than or equal to 0.05% of Cu, less than or equal to 0.05% of Mn, less than or equal to 0.05% of Ti, less than or equal to 0.005% of Mg, less than or equal to 0.005% of Zn, and the balance of Al and inevitable impurities;
after the raw materials are mixed according to the components, the molten aluminum with the temperature of 685-705 ℃ is obtained after the technological processes of smelting, slagging-off, detection, refining, standing, degassing and deslagging;
(2) continuously casting and rolling the plate coil by two rollers;
casting and rolling the aluminum liquid obtained in the step (1) to obtain a cast-rolled coil blank; the specification is 7.8-10 mm multiplied by 1200mm multiplied by Lmm; the longitudinal plane parallel to the rolling direction has crystal grains with length-to-length axis ratio of 6-10 and crystal grain area of 3500-4500 μm2；
(3) Cogging and cold rolling: cogging and cold rolling the cast-rolled coil blank obtained in the step (2), and obtaining an intermediate plate coil with the thickness of 6.8-8.0 mm through the machining rate of 25-30%;
(4) intermediate homogenizing annealing;
putting the intermediate plate coil obtained in the step (3) into an annealing furnace, controlling the temperature to be between 530 and 580 ℃, and controlling the grain size of the annealed intermediate plate coil to be between 250 and 400 mu m;
(5) cold rolling and foil rolling;
cold rolling the intermediate plate coil annealed in the step (4) to the thickness of 0.3-0.6 mm, and foil rolling to 35-45 mu m to obtain a foil with the finished thickness; wherein the total processing rate of cold rolling and foil rolling is controlled between 98.5 percent and 99.5 percent;
(6) annealing the finished product;
annealing the finished product of the foil rolled in the step (5); the temperature of the finished product is controlled between 280 ℃ and 340 ℃ during annealing, the grain size is controlled between 15 mu m and 30 mu m, and the second phase is controlled between 0.2 mu m2～0.5μm2To (c) to (d); and the structure control of the iron-rich aluminum alloy is realized after the finished product is annealed.
2. The method for controlling the structure of the iron-rich aluminum alloy according to claim 1, wherein in the step (1), the iron-rich aluminum alloy is controlled to have the following chemical components in percentage by mass: 1.1-1.50% of Fe, 0.10-0.12% of Si, less than or equal to 0.05% of Cu, less than or equal to 0.05% of Mn, less than or equal to 0.05% of Ti, less than or equal to 0.005% of Mg, less than or equal to 0.005% of Zn, and the balance of Al and inevitable impurities.
3. The method of controlling the microstructure of an iron-rich aluminum alloy as set forth in claim 1, wherein in the step (2), the specification of the cast-rolled slab in the step (2) is 9.0 to 10mm x 1200mm x Lmm.
4. The method of controlling a microstructure of an iron-rich aluminum alloy as set forth in claim 1, wherein in the step (5), the intermediate plate coil is cold-rolled to a thickness of 0.34mm to 0.5mm, and then is foil-rolled to 45 μm.
5. The method of controlling a microstructure of an iron-rich aluminum alloy according to claim 1, wherein in the step (6), the grain size is controlled to 15 μm to 20 μm.
6. The method of controlling a microstructure of an iron-rich aluminum alloy as recited in claim 1, wherein in the step (6), the second phase is controlled to 0.24 μm2～0.3μm2In the meantime.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116043070A (en) * | 2023-01-09 | 2023-05-02 | 江苏鼎胜新能源材料股份有限公司 | Preparation method of aluminum foil material for battery with low-density second-phase particles |
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| CN111270109A (en) * | 2020-03-31 | 2020-06-12 | 江苏鼎胜新能源材料股份有限公司 | Method for producing 8021 aluminum alloy soft packaging foil for lithium battery by cast rolling method |
| CN112195332A (en) * | 2020-09-30 | 2021-01-08 | 江苏大学 | Grading oil removal annealing process for 8011 aluminum foil tape base material |
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2021
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| EP0750685A1 (en) * | 1994-03-18 | 1997-01-02 | Alcan International Limited | Aluminium foil |
| US20030031887A1 (en) * | 2001-07-11 | 2003-02-13 | Alcoa Inc. | Aluminum paper |
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