CN115261688A - 7-series aluminum alloy material for hot forming and manufacturing method thereof - Google Patents
7-series aluminum alloy material for hot forming and manufacturing method thereof Download PDFInfo
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- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
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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
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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
- 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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Abstract
The invention relates to a 7-series aluminum alloy material for hot forming, which is prepared from the following element components in percentage by weight: si is less than or equal to 0.20 percent, fe is less than or equal to 0.30 percent, cu: 1.0-3.0%, mn less than or equal to 0.20%, mg: 2.0-2.6%, cr is less than or equal to 0.10%, zn: 6.5-7.6%, ti is less than or equal to 0.05%, zr: 0.07-0.16 percent, less than or equal to 0.03 percent of single impurity, less than or equal to 0.10 percent of impurity in total and the balance of Al, and the composition of the alloy precipitated phase distribution and the texture is regulated and controlled by closely combining a series of means such as alloy component design, a three-stage homogenization process, reasonable hot rolling pass matching, a two-stage continuous annealing and annealing process and the like, so that the alloy has uniform r values in three directions, is more favorable for stamping and forming, and can achieve more than 530MPa of yield and tensile strength after the forming and the aging, and is higher than the performance of the current 7075 hot forming material.
Description
Technical Field
The invention belongs to the technical field of metal materials, and relates to a 7-series aluminum alloy material for hot forming and a manufacturing method thereof.
Background
In recent years, under the environment of energy conservation and emission reduction, light alloys, especially aluminum alloys, play more and more important roles and are widely applied to the aspects of aerospace, automobiles, rail traffic and the like. The forming of the aluminum alloy at normal temperature has the defects of large rebound and poor fluidity, so that complex parts cannot be formed. At present, 5-series and 6-series aluminum alloys are used on automobiles, achieve the required shape through cold deformation, have medium strength, and are multipurpose for parts with simpler shapes, such as four doors and two covers. The 7-series aluminum alloy belongs to ultrahigh-strength aluminum alloy and is an ideal structural material, but the application of the 7-series aluminum alloy is greatly limited due to the difficulty in forming. However, the hot stamping process is proposed and applied because the rheological stress is reduced and the deformation resistance is reduced under the hot forming, and the quality and the precision of a formed part can be better improved. Recently, with the rapid development of hot forming technology for aluminum alloys, 7-series aluminum alloys can be processed into relatively complicated parts, such as structural members of a-pillars, B-pillars, roof rails, side rails, and window sills of automobiles, by hot forming, and have high strength after aging.
At present, many scholars have studied hot forming of 7-series aluminum alloy, such as patent inventions with publication number CN106756673A, CN111876639A, CN113351767a, etc., or optimized 7075 processing technology, or improved hot processing equipment or hot processing flow, so that hot forming can be carried out more smoothly and efficiently. However, there are few patents which deal with the moldability of the 7-series hot-forming material itself, and there is no patent which optimizes the moldability and strength of the 7-series hot-forming material simultaneously.
Disclosure of Invention
In view of the above, the present invention provides a 7-series aluminum alloy material for hot forming and a manufacturing method thereof, in order to solve the problems that the forming performance of a 7-series hot forming material itself is rarely studied in the prior art, and the forming performance and strength of the 7-series hot forming material are not optimized synchronously, which affects the application range thereof.
In order to achieve the purpose, the invention provides the following technical scheme:
a7-series aluminum alloy material for hot forming is prepared from the following element components in percentage by weight: si is less than or equal to 0.20 percent, fe is less than or equal to 0.30 percent, cu: 1.0-3.0%, mn less than or equal to 0.20%, mg: 2.0-2.6%, cr is less than or equal to 0.10%, zn: 6.5-7.6%, ti is less than or equal to 0.05%, zr: 0.07-0.16 percent, less than or equal to 0.03 percent of single impurity, less than or equal to 0.10 percent of total impurity and the balance of Al.
Further, the 7-series aluminum alloy material for hot forming is preferably prepared from the following element components in percentage by weight: si is less than or equal to 0.07%, fe is less than or equal to 0.10%, cu: 2.2-2.4%, mn is less than or equal to 0.05%, mg: 2.1-2.4%, cr is less than or equal to 0.05%, zn:6.9 to 7.3%, ti:0.01 to 0.02%, zr: 0.09-0.12 percent, less than or equal to 0.03 percent of single impurity, less than or equal to 0.10 percent of impurity in total, and the balance of Al.
A method for producing a 7-series aluminum alloy material for hot forming, comprising the steps of:
A. preparing materials: preparing raw materials for preparing the 7-series aluminum alloy material according to weight percentage;
B. casting: adding the prepared aluminum alloy raw material into a smelting furnace, uniformly mixing, smelting to obtain liquid aluminum alloy, melting the liquid aluminum alloy at the temperature of 700-760 ℃, starting electromagnetic stirring and slagging off in the melting process; then, refining in a converter to a holding furnace at the refining temperature of 710-750 ℃ by using chlorine-argon mixed gas, and removing slag, wherein sampling detection is carried out during the refining; if the components do not meet the requirements, adding corresponding alloy according to a batching table to adjust the components, and if the components meet the requirements, casting after passing through double-stage filtering equipment to obtain a 7-series aluminum alloy slab ingot;
C. three-stage homogenizing annealing: putting the aluminum alloy slab ingot after being cast out of the furnace into a box-type annealing furnace for three-stage homogenizing annealing, wherein the homogenizing annealing process comprises the following steps: (350-420) DEG C/4-10) h + (450-465) DEG C/20-40) h + (470-475) DEG C/4-10) h, after homogenization, rapidly cooling the ingot, wherein the cooling speed needs to reach more than 150 ℃/h so as to control the precipitation of coarse second phases in the cooling process;
D. ingot casting and heating: the aluminum alloy cast ingot after the homogenizing annealing is placed into a push type heating furnace for heating and heat preservation at the temperature of 450 ℃/5h after the head and the tail of the aluminum alloy cast ingot are sawed and the surface of the aluminum alloy cast ingot is milled;
E. rolling: discharging the aluminum alloy ingot after heating and heat preservation from a furnace, carrying out hot rolling at the beginning temperature of 410 ℃, firstly carrying out 8-pass transverse rolling on hot rough rolling, wherein the total rolling reduction is 80-150 mm, then carrying out longitudinal rolling on the ingot by transposition at 90 degrees, carrying out longitudinal rolling on the ingot for 15 passes, the maximum rolling reduction is 30mm, the thickness of an intermediate billet is 40-45 mm, then carrying out four-pass rolling on the ingot, and carrying out finish rolling on the ingot, wherein the four-pass rolling reduction ratios are respectively: 32% -37% -35%, obtaining hot-rolled coils with the thickness of 9mm, wherein the coiling temperature is 320 +/-10 ℃; then cold rolling the hot rolled coil from 9mm to 6.8mm for the first time, 5.1mm for the second time, performing intermediate annealing treatment, 3.9mm for the third time and 3mm for the fourth time;
the cross rolling aims to regulate and control the alloy structure and texture in the deformation process and prevent the single texture from being generated in a large range. And rolling the material subjected to the double-stage continuous annealing for 3mm of finished product thickness to finish the production of the material part, and then performing hot stamping in a conventional hot forming process.
F. Solution quenching: and (3) carrying out solution treatment at 470 ℃/30min on the rolled aluminum alloy plate, carrying out performance test after quenching, and then continuing carrying out aging at 120 ℃/24h to reach peak strength for performance test.
Further, raw materials for preparing the 7-series aluminum alloy material in the step A adopt industrial pure aluminum, industrial pure Mg, industrial pure Zn, intermediate alloy Al-Si, intermediate alloy Al-Cu, intermediate alloy Al-Mn, intermediate alloy Al-Ti and intermediate alloy Al-Zr.
Further, the three-stage homogenization annealing process in the step C comprises the following steps: 400 ℃/8h, 463 ℃/30h, 472 ℃/8h.
And further, adopting a mode of head and tail pass small reduction and middle pass large reduction during hot rough rolling of the aluminum alloy cast ingot in the step E.
Furthermore, the deformation rate of 40-50% is reserved after the intermediate annealing in the step E, the intermediate annealing is carried out in a continuous annealing furnace, and a two-stage annealing process is adopted, wherein the specific system is 430 ℃/5s +470 ℃/20s.
The invention has the beneficial effects that:
1. the 7-series aluminum alloy material for hot forming disclosed by the invention has the main parameter influencing material forming as r value, namely plastic strain ratio, which is a measure of the plastic anisotropy of the plate and is an important index for measuring the forming performance of the plate, and generally, the larger the r value is, the better the deep drawing performance of the plate is. The uniformity of the r value can be expressed as the plastic strain ratio planar anisotropy (Δ r), where: Δ r = (r 0+ r 90)/2-r 45. The influence of Δ r is mainly the degree of anisotropy in three directions of the sheet, and it is desirable that the smaller Δ r is, the better the thermoformable material is. The main factor influencing the r value of the material is the composition and distribution of the internal texture of the alloy. Common textures of aluminum alloys are deformed textures which appear when the aluminum alloy is deformed: {112} <111> -copper texture, {123} <634> -s texture and {011} <211> -brass texture, and {100} <001> -cube texture, {110} <001> -goss texture, {011} <111> -p texture and {124} <211> -r texture, which appear during annealing. Therefore, the texture is closely related to a rolling process and an annealing process, and the continuous annealing two-stage annealing process is adopted on the basis of optimizing hot rolling and cold rolling passes, namely, the characteristic of rapid temperature rise of a continuous annealing line is utilized, so that the generation of a large amount of recrystallized textures is inhibited, and the type and the distribution of the recrystallized textures are strictly controlled. In order to obtain an isotropic r value, reasonable proportion of a recrystallization texture and a deformation texture is needed, the control of hot rolling and cold rolling passes and the application of a double-stage continuous annealing and annealing process are used for obtaining the optimal texture combination, namely a Cube texture and an S texture are dominant, a Brass texture and a Goss texture are interspersed, and the P texture and the S texture are uniformly dispersed in a matrix. The good texture combination and distribution can reduce the anisotropy of the material, greatly improve the deformability of the material and facilitate the stamping forming. In addition, high-temperature annealing adopted during continuous annealing can dissolve a part of coarse second phases, so that the re-dissolution during solid solution before subsequent hot forming is more sufficient, the precipitation of an aging precipitated phase is more facilitated, and the alloy strength is better improved.
2. The 7-series aluminum alloy material for hot forming disclosed by the invention reduces the number of impurity phases in the alloy by strictly controlling the content of Si and Fe impurity elements, thereby reducing the crack development source in the stamping process. Trace alloying elements Zr, cr and Mn have obvious influence on the quenching sensitivity of the alloy, and Al with small size (less than or equal to 30 nm) can be formed in the alloy by regulating and controlling the proportion of the trace elements3The Zr particles have good coherent relation with the matrix, can greatly reduce the quenching sensitivity of the alloy, and can form solid solution with high supersaturation degree as much as possible in the hot forming process. Through the regulation and control of the proportion of Mg, zn and Cu elements, more dispersion nano-scale strengthening phases are precipitated from the alloy in the subsequent aging process, so that the strength of the part is improved.
3. The invention discloses a manufacturing method of a 7-series aluminum alloy material for hot forming, which starts from the two aspects of improving the forming performance of the 7-series material and the strength after aging, regulates and controls the distribution of precipitated phases of an alloy and the composition of a texture by closely combining a series of means such as alloy composition design, a three-level homogenization process, reasonable hot rolling pass matching, a two-level continuous annealing and middle-annealing process and the like, so that the alloy has uniform r values in three directions, is more favorable for stamping forming, and can achieve the tensile yield of more than 530Mpa after the forming and higher than the performance of the current 7075 hot forming material.
4. The manufacturing method of the 7-series aluminum alloy material for hot forming starts from two aspects of component design and process optimization, improves the alloy strength by regulating and controlling the distribution of each element component and phase of the alloy, and regulates and controls the composition and distribution of an alloy texture by controlling hot rolling and cold rolling passes and a medium annealing process, thereby improving the forming performance and obtaining the synchronous improvement of the formability and the strength. The 7-series material produced by the invention has excellent hot forming performance, has higher strength than that of the common 7-series hot forming material, is suitable for hot stamping and forming more complex parts, can greatly accelerate the lightweight process of automobiles, and has a certain guiding function on the production and development of high comprehensive performance aluminum alloys in other fields.
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. It should be noted that the following examples are only illustrative of the basic idea of the present invention, and features in the following examples and examples may be combined with each other without conflict.
Examples
A method for producing a 7-series aluminum alloy material for hot forming, comprising the steps of:
A. preparing materials: preparing an aluminum alloy raw material according to the following weight parts:
| element(s) | Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti | Zr | Impurities | Al |
| Content (c) of | 0.035 | 0.052 | 2.277 | 0.004 | 2.175 | 0.001 | 7.125 | 0.015 | 0.10 | 0.05 | Allowance of |
Raw materials for preparing the 7-series aluminum alloy material adopt industrial pure aluminum, industrial pure Mg, industrial pure Zn, intermediate alloy Al-Si, intermediate alloy Al-Cu, intermediate alloy Al-Mn, intermediate alloy Al-Ti, intermediate alloy Al-Zr and the like;
B. casting: adding the prepared aluminum alloy raw material into a smelting furnace, uniformly mixing, smelting to obtain liquid aluminum alloy, melting the liquid aluminum alloy at the temperature of 700-760 ℃, starting electromagnetic stirring and slagging off in the melting process; then, refining in a converter to a holding furnace at the refining temperature of 710-750 ℃ by using chlorine-argon mixed gas, and removing slag, wherein sampling detection is carried out during the refining; if the components do not meet the requirements, adding corresponding alloy according to a batching table to adjust the components, and if the components meet the requirements, casting after passing through double-stage filtering equipment to obtain a 7-series aluminum alloy slab ingot;
C. three-stage homogenization annealing: putting the aluminum alloy slab ingot discharged from the furnace after melt casting into a box-type annealing furnace for three-stage homogenization annealing, wherein the homogenization annealing process comprises the following steps: 400 ℃/8h, 463 ℃/30h, 472 ℃/8h, rapidly cooling the cast ingot after homogenization is finished, wherein the cooling speed is 170 ℃/h to control the precipitation of a coarse second phase in the cooling process;
D. ingot casting and heating: the aluminum alloy cast ingot after the homogenizing annealing is placed into a push type heating furnace for heating and heat preservation at the temperature of 450 ℃/5h after the head and the tail of the aluminum alloy cast ingot are sawed and the surface of the aluminum alloy cast ingot is milled;
E. rolling: taking the aluminum alloy ingot after heating and heat preservation out of the furnace, carrying out hot rolling at the beginning rolling temperature of 410 ℃, firstly carrying out 8-pass transverse rolling on hot rough rolling, wherein the total reduction is 100mm, then carrying out longitudinal rolling on the ingot after transposition at 90 degrees, carrying out longitudinal rolling on 15 passes, the maximum reduction is 30mm, the thickness of an intermediate blank is 43mm, then carrying out finish rolling on the ingot by four-pass rolling, and the four-pass rolling reduction ratio is respectively: 32% -37% -35%, obtaining hot-rolled coils with the thickness of 9mm, wherein the coiling temperature is 320 +/-10 ℃; then cold rolling the hot rolled coil from 9mm to 6.8mm for the first time, 5.1mm for the second time, performing intermediate annealing treatment, 3.9mm for the third time and 3mm for the fourth time; the intermediate annealing is carried out in a continuous annealing furnace, and a double-stage annealing process is adopted, wherein the specific system is 430 ℃/5s +470 ℃/20s.
The cross rolling aims to regulate and control the alloy structure and texture in the deformation process and prevent the single texture from being generated in a large range. And rolling the material subjected to the double-stage continuous annealing for 3mm of finished product thickness to finish the production of the material part, and then performing hot stamping in a conventional hot forming process.
F. Solution quenching: and (3) carrying out solution treatment at 470 ℃/30min on the rolled aluminum alloy plate, carrying out performance test after quenching, and then continuing carrying out aging at 120 ℃/24h to reach peak strength for performance test.
Comparative example
A method of making a generic 7075 hot-formed aluminum alloy material, comprising the steps of:
A. preparing materials: the general 7075 hot forming material comprises the following components in percentage by weight:
| element(s) | Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti | Zr | Impurities | Al |
| Content (c) of | 0.067 | 0.144 | 1.349 | 0.016 | 2.679 | 0.221 | 5.761 | 0.026 | 0.023 | 0.05 | Balance of |
The aluminum alloy raw material adopts industrial pure aluminum, industrial pure Mg, industrial pure Zn, intermediate alloy Al-Si, intermediate alloy Al-Cu, intermediate alloy Al-Zr, intermediate alloy Al-Ti and the like;
B. casting: adding the prepared aluminum alloy raw material into a smelting furnace, uniformly mixing, smelting to obtain liquid aluminum alloy, melting the liquid aluminum alloy at the temperature of 700-760 ℃, starting electromagnetic stirring and slagging off in the melting process; then, refining in a converter to a holding furnace at the refining temperature of 710-750 ℃ by using chlorine-argon mixed gas, and removing slag, wherein sampling detection is carried out during the refining; if the components are in accordance with the standard, casting the aluminum alloy after passing through double-stage filtering equipment to obtain a 7075 aluminum alloy slab ingot;
C. homogenizing and annealing: putting the aluminum alloy slab ingot after being discharged from the furnace into a box-type annealing furnace for carrying out homogenization annealing, wherein the homogenization annealing process comprises the following steps: 470 ℃/10h without a cooling procedure;
D. ingot casting and heating: the aluminum alloy cast ingot after the homogenizing annealing is placed into a push type heating furnace for heating and heat preservation at the temperature of 450 ℃/5h after the head and the tail of the aluminum alloy cast ingot are sawed and the surface of the aluminum alloy cast ingot is milled;
E. rolling: discharging the aluminum alloy ingot after heating and heat preservation from a furnace, carrying out hot rolling, wherein the initial rolling temperature is 410 ℃, the transverse rolling process is not needed, the thickness of the intermediate billet is directly rolled by 23 passes by 40mm, then carrying out four-pass rolling for finish rolling, and the four-pass rolling reduction ratios are respectively: 332 to 37 to 35 percent to obtain a hot rolled coil with the thickness of 7mm, wherein the coiling temperature is 320 +/-10 ℃; then cold rolling the hot rolled coil from the thickness of 7mm to 5.1mm for the first time, 3.9mm for the second time and 3mm for the third time; no intermediate annealing treatment is performed.
F. Solution quenching: and (3) carrying out solution treatment on the rolled aluminum alloy plate at 470 ℃/30min, carrying out performance test after quenching, and then continuing carrying out aging at 120 ℃/24h to reach peak strength for performance test.
The performance results for the two alloys of the examples and comparative examples are shown in the following table (in the table Ag stands for uniform elongation and A80 for total elongation of 80 gauge sample R8-12 for elongation range of 8-12% when r is measured, which are several performance indicators commonly used for automotive sheet):
through the comparison of the performances, the strength and the elongation of the examples and the comparative examples are close to each other in a solid solution state, but the r value in the direction of the examples is more uniform, so that the delta r value is far smaller than that of the examples, which shows that the anisotropy of the material is smaller, the deformation in stamping is more uniform, and the formability is better. Comparison of the as-aged properties shows that the tensile strength and yield strength of the examples are significantly higher than those of the comparative examples, and the elongation is also slightly higher than those of the comparative examples.
In conclusion, compared with the traditional 7075 alloy, the 7-series aluminum alloy for hot forming produced by the components and the process route designed by the invention has better forming performance, has better strength after aging, and is more suitable for hot forming and stamping more complex parts and structural parts with larger stress.
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 (7)
1. The 7-series aluminum alloy material for hot forming is characterized by being prepared from the following element components in percentage by weight: si is less than or equal to 0.20 percent, fe is less than or equal to 0.30 percent, cu: 1.0-3.0%, mn is less than or equal to 0.20%, mg: 2.0-2.6%, cr is less than or equal to 0.10%, zn: 6.5-7.6%, ti is less than or equal to 0.05%, zr:0.07 to 0.16 percent, less than or equal to 0.03 percent of single impurity, less than or equal to 0.10 percent of impurity in total, and the balance of Al.
2. The 7-series aluminum alloy material for hot forming according to claim 1, which is prepared from the following element components in percentage by weight: si is less than or equal to 0.07%, fe is less than or equal to 0.10%, cu: 2.2-2.4%, mn less than or equal to 0.05%, mg: 2.1-2.4%, cr is less than or equal to 0.05%, zn:6.9 to 7.3%, ti:0.01 to 0.02%, zr: 0.09-0.12 percent, less than or equal to 0.03 percent of single impurity, less than or equal to 0.10 percent of impurity in total, and the balance of Al.
3. The method for producing a 7-series aluminum alloy material for hot forming according to claim 1, comprising the steps of:
A. preparing materials: preparing raw materials for preparing the 7-series aluminum alloy material according to weight percentage;
B. casting: adding the prepared aluminum alloy raw material into a smelting furnace, uniformly mixing, smelting to obtain liquid aluminum alloy, melting the liquid aluminum alloy at the temperature of 700-760 ℃, starting electromagnetic stirring and slagging off in the melting process; then, refining in a converter to a holding furnace at the refining temperature of 710-750 ℃ by using chlorine-argon mixed gas, and removing slag, wherein sampling detection is carried out during the refining; if the components do not meet the requirements, adding corresponding alloy according to a batching table to adjust the components, and if the components meet the requirements, casting after passing through double-stage filtering equipment to obtain a 7-series aluminum alloy slab ingot;
C. three-stage homogenizing annealing: putting the aluminum alloy slab ingot discharged from the furnace after melt casting into a box-type annealing furnace for three-stage homogenization annealing, wherein the homogenization annealing process comprises the following steps: (350-420) DEG C/4-10 h + (450-465) DEG C/20-40) h + (470-475) DEG C/4-10 h, rapidly cooling the ingot after homogenization is finished, wherein the cooling speed needs to reach more than 150 ℃/h so as to control the precipitation of coarse second phases in the cooling process;
D. heating the cast ingot: the aluminum alloy cast ingot after the homogenizing annealing is placed into a push type heating furnace for heating and heat preservation at the temperature of 450 ℃/5h after the head and the tail of the aluminum alloy cast ingot are sawed and the surface of the aluminum alloy cast ingot is milled;
E. rolling: discharging the aluminum alloy ingot after heating and heat preservation from a furnace, carrying out hot rolling at the beginning temperature of 410 ℃, firstly carrying out 8-pass transverse rolling on hot rough rolling, wherein the total rolling reduction is 80-150 mm, then carrying out longitudinal rolling on the ingot by transposition at 90 degrees, carrying out longitudinal rolling on the ingot for 15 passes, the maximum rolling reduction is 30mm, the thickness of an intermediate billet is 40-45 mm, then carrying out four-pass rolling on the ingot, and carrying out finish rolling on the ingot, wherein the four-pass rolling reduction ratios are respectively: 32% -37% -35% to obtain hot-rolled coils with the thickness of 9mm, wherein the coiling temperature is 320 +/-10 ℃; then, cold rolling the hot rolled coil from 9mm to 6.8mm for the first time, 5.1mm for the second time, performing intermediate annealing treatment, and rolling to 3.9mm for the third time and 3mm for the fourth time;
the cross rolling aims to regulate and control the alloy structure and texture in the deformation process and prevent the single texture from being generated in a large range. And rolling the material subjected to the double-stage continuous annealing for 3mm of finished product thickness to finish the production of the material part, and then performing hot stamping in a conventional hot forming process.
F. Solution quenching: and (3) carrying out solution treatment at 470 ℃/30min on the rolled aluminum alloy plate, carrying out performance test after quenching, and then continuing carrying out aging at 120 ℃/24h to reach peak strength for performance test.
4. The method for producing a 7-series aluminum alloy material for hot forming according to claim 3, wherein the raw materials for producing the 7-series aluminum alloy material in the step A are commercially pure aluminum, commercially pure Mg, commercially pure Zn, master alloy Al-Si, master alloy Al-Cu, master alloy Al-Mn, master alloy Al-Ti, and master alloy Al-Zr.
5. The method of manufacturing a 7-series aluminum alloy material for hot forming according to claim 3, wherein the three-stage homogenization annealing process in the step C is: 400 ℃/8h, 463 ℃/30h, 472 ℃/8h.
6. The method for producing a 7-series aluminum alloy material for hot forming according to claim 3, wherein the aluminum alloy ingot in the step E is subjected to rough hot rolling in a manner of a small reduction at the first and last passes and a large reduction at the intermediate pass.
7. The method for manufacturing a 7-series aluminum alloy material for hot forming according to claim 3, wherein after the intermediate annealing in step E, a deformation rate of 40-50% is kept, the intermediate annealing is performed in a continuous annealing furnace, and a double-stage annealing process is adopted, wherein a specific system is 430 ℃/5s +470 ℃/20s.
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| CN115634928A (en) * | 2022-12-05 | 2023-01-24 | 中国航发北京航空材料研究院 | Method for improving comprehensive performance of ultra-wide and ultra-thick aluminum alloy plate for aviation |
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