CN110184513B - High-stress-corrosion-resistance Al-Zn-Mg-Cu aluminum alloy section and preparation method thereof - Google Patents
High-stress-corrosion-resistance Al-Zn-Mg-Cu aluminum alloy section and preparation method thereof Download PDFInfo
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Abstract
The invention aims to provide an Al-Zn-Mg-Cu aluminum alloy profile with high stress corrosion resistance and a preparation method thereof, wherein the aluminum alloy material comprises the following element components in percentage by mass: si is less than or equal to 0.1%, Fe is less than or equal to 0.1%, Cu = 0.12-0.14%, Mn = 0.23-0.25%, Mg = 0.75-0.8%, Cr = 0.15-0.17%, Zn = 5.7-5.8%, Zr = 0.16-0.19%, Ti = 0.02-0.04%, the Fe/Si ratio is 1.8-2.5, and the Zn/Mg ratio is controlled to be 7.1-7.7. The preparation method comprises the steps of smelting, refining, essence melting, casting, homogenizing annealing, extruding, solution quenching, stress relieving and aging treatment. The invention can lead the material to show better mechanical strength and stress corrosion resistance, and is particularly suitable for aluminum alloy structural members which are easy to generate stress corrosion and lose effectiveness, in particular to aluminum alloy structural members of rail transit or car body bottom tension stress.
Description
Technical Field
The invention belongs to the technical field of metal materials and processing thereof, and relates to a high-stress-corrosion-resistance Al-Zn-Mg-Cu aluminum alloy section and a preparation method thereof.
Background
With the rapid development of the high-speed rail in China, the train set bears the motion load in the service process in a complex way, and the high-speed motor train unit can also run in a large-range trans-regional long time, so that the service environment changes greatly. And the electric cabinet body of the train is exposed at the bottom of the train, no protective measures are taken, and the service environment is particularly severe. The train electrical cabinet is mainly influenced by tensile stress, stress corrosion fracture is easily generated in the service process, the stress corrosion behavior is difficult to discover and eliminate by conventional detection means before the stage of crack fracture, and once the stress corrosion fracture occurs, the electrical cabinet body is very likely to fall off, thereby seriously influencing the train operation safety. In order to avoid the phenomenon of stress corrosion cracking of the rail transit electric cabinet body in service, the material used by the electric cabinet body has high stress corrosion sensitivity so as to meet the comprehensive performance requirements of light weight, structural strength and stress corrosion resistance of the rail transit electric cabinet body.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide the Al-Zn-Mg-Cu aluminum alloy section with high stress corrosion resistance and the preparation method thereof, so that the material has better mechanical strength and stress corrosion resistance, and is particularly suitable for aluminum alloy structural members which are easy to generate stress corrosion and lose effectiveness, especially aluminum alloy structural members with tensile stress at the bottom of a rail transit or a vehicle body.
In order to achieve the purpose, the technical scheme of the invention is as follows:
an Al-Zn-Mg-Cu aluminum alloy profile with high stress corrosion resistance, wherein the aluminum alloy material comprises the following element components in percentage by mass: si is less than or equal to 0.1%, Fe is less than or equal to 0.1%, Cu = 0.12-0.14%, Mn = 0.23-0.25%, Mg = 0.75-0.8%, Cr = 0.15-0.17%, Zn = 5.7-5.8%, Zr = 0.16-0.19%, Ti = 0.02-0.04%, the Fe/Si ratio is 1.8-2.5, and the Zn/Mg ratio is controlled to be 7.1-7.7; each inevitable impurity element is less than 0.04%, and the total amount is less than 0.1%, and the balance is Al.
The preparation method of the Al-Zn-Mg-Cu aluminum alloy profile with high stress corrosion resistance comprises the following steps:
(1) smelting: weighing raw materials according to the component requirements of the aluminum alloy section, and putting the raw materials into a smelting furnace for smelting;
(2) refining: maintaining the temperature of the molten aluminum at 730-760 ℃, refining the melt, removing slag inclusions in the melt, and adjusting the content of alloy components;
(3) purifying the melt: degassing and filtering the melt by matching a degassing device and a filtering device to ensure that the hydrogen content in the melt is less than 0.10ml/100 gAl;
(4) casting;
(5) carrying out homogenization annealing;
(6) extruding;
(7) solution quenching;
(8) stretching and straightening and profile destressing: and (3) stretching and straightening the section after solution quenching, wherein the stretching ratio is as follows: 1.8-2.8%; in the process of stretching and straightening, stress sensors are arranged at two stretched ends of the profile, the percentage of the residual stress of the profile is fed back through the sensors, and the supporting height of the profile support rollers is adjusted to eliminate the residual stress of the profile;
(9) and (4) aging treatment, wherein a finished product can be obtained after the aging treatment is finished.
Further, in the step (8), the method for adjusting the supporting height of the profile back-up roll comprises the following steps:
when the residual stress R of the material is detected to be less than 10% by the residual stress sensing equipment, adjusting the height of the highest point of the supporting roller to be 0 mm;
when the residual stress R of the material is detected as: when R is more than 10% and less than or equal to 30%, the supporting peak height of the supporting roller is adjusted as follows: h = L × 6R;
when the residual stress R of the material is detected as: when R is more than 30% and less than or equal to 50%, the supporting peak height of the supporting roller is adjusted as follows: h = L × 8R;
when the residual stress R of the material is detected as: when R is more than 50% and less than or equal to 70%, the supporting peak height of the supporting roller is adjusted as follows: h = L9R;
when the residual stress R of the material is detected as: when R is more than 70%, the supporting height of the supporting roller is adjusted to be 0-10 mm, and the stretching rate is increased by 0.2-0.5%;
h is the height of the supporting roller, and the unit is mm, and L is the length of the section bar, and the unit is m.
Further, in the step (1), the smelting temperature is 740-760 ℃.
Further, in the step (2), the refining temperature is 730-760 ℃.
Further, in the step (4), the casting temperature is 690-710 ℃.
Further, in the step (5), homogenizing annealing is carried out in a soaking furnace and is subjected to 3-level homogenizing annealing process; three-stage homogenization annealing process: in the first stage, the temperature is 360 +/-5 ℃, and the time is 3-4 hours; in the second stage, the temperature is 420 +/-5 ℃, and the time is 6-8 hours; thirdly, the temperature is 470 +/-5 ℃, and the time is 28-36 h; the heating rate is 40 +/-5 ℃/h.
Further, in the step (6), the specific process of extrusion includes: preheating the cast ingot after the homogenizing annealing at 430 +/-15 ℃, and putting the cast ingot into an extrusion container for extrusion, wherein the temperature of the extrusion container is as follows: 460 ℃ ± 15 ℃, mold temperature: at the temperature of 450 +/-10 ℃; the extrusion speed of the section bar is 3-5 m/min.
Further, in the step (7), the solution quenching comprises: carrying out on-line solution quenching on the extruded and formed section, wherein the quenching inlet temperature of the section is more than 440 ℃; the cooling medium is cooled by water mist.
Further, in the step (9), a three-stage aging treatment is adopted: in the first stage, the aging temperature is 30 +/-10 ℃, and the temperature is kept for 120-200 hours; in the second stage, the aging temperature is 90-100 ℃, and the temperature is kept for 6-10 hours; and thirdly, the aging temperature is 155-165 ℃, and the heat preservation is carried out for 14-24 hours.
The invention improves the mechanical property and the stress corrosion resistance of the material mainly by designing reasonable aluminum alloy element components: (1) the content of the Cu element is controlled to be 0.12-0.14%, so that pitting corrosion of the material can be converted into uniform corrosion, the Cu can increase the cathode potential of aluminum, neutralize the anode potential generated by the Zn element, and reduce the electrode potential difference of the whole material. (2) According to the invention, the content design of Cr and Zr can effectively inhibit recrystallization nucleation and growth, so that the grain structure of an extruded low-angle grain boundary is obtained, and the expansion rate of corrosion along the grain boundary is further hindered. (3) In the invention, the content of Mn is designed to promote Al8Mg5Uniform precipitation, improved corrosion resistance, effective inhibition of recrystallization nucleation and growth by Mn, increased recrystallization temperature, and reduced harmful effect of Fe impurity; mn can increase the cathode potential of aluminum and neutralize the positive generated by Zn elementThe electrode potential reduces the electrode potential difference of the whole material. (4) The invention controls the Fe/Si ratio to be 1.8-2.8, can reduce the crack tendency of the extrusion piece in a hot extrusion state, improves the surface quality of the product and improves the extrusion efficiency. (5) The Zn/Mg ratio is controlled to be 7.1-7.7, so that a high mechanical property strengthening effect can be obtained, and meanwhile, good stress corrosion cracking resistance is obtained.
Furthermore, the invention carries out stress relief in the process of stretching the section bar, and utilizes a detector to detect the residual stress of the section bar in the process of stretching and straightening, and adjusts the stretching rate or the supporting height of the support roller in the process of stretching to eliminate the residual stress, thereby effectively reducing the residual stress of the section bar in time and improving the stress corrosion resistance of the aluminum alloy section bar.
The invention further adopts a smelting and casting online degassing device, and after degassing, the hydrogen content of the melt is controlled to be less than 0.10ml/100gAl, so that the influence of hydrogen on the stress corrosion cracking resistance of the material can be greatly reduced.
The invention further adopts a three-stage homogenization annealing process to carry out heat treatment on the cast ingot, reduces the cracking tendency in the homogenization heat treatment process of the cast ingot, fully dissolves the low-melting-point nonequilibrium phase, precipitates and separates out the supersaturated solid solution, eliminates the segregation of the dendrites, and reduces the resistance to the deformation of the structure.
The invention further adopts an extrusion on-line solution quenching process, uses water mist for cooling, and reduces the quenching cooling strength under the condition of ensuring the full quenching of the material so as to reduce the quenching residual stress of the section.
The invention further adopts a three-stage aging heat treatment process, and products with stable performance, enough strength and higher corrosion resistance are obtained through three-stage aging treatment.
The strength of the aluminum alloy section prepared by the preparation method is more than 330Mpa, and the aluminum alloy section resists stress corrosion I under the test conditions of 25 ℃ and 50 DEG CSRRT≤5.0%。
Drawings
FIG. 1 is a diffraction pattern of the extruded small angle intergranular grain structure of example 3.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further described below by combining the specific drawings and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The method is characterized in that an industrial-grade aluminum ingot with purity of more than 99.70 percent is used as a raw material, and a related raw and auxiliary material intermediate alloy is used for smelting and casting, wherein the mass percentages of alloy elements in each embodiment are shown in the following table:
example 1
In example 1 of the present invention, the mass percentages of the elements of the aluminum alloy are shown in table 1, and the manufacturing method includes the following steps: (1) adding an industrial grade aluminum ingot with the purity of more than 99.70 percent and various required alloy elements for smelting, wherein the smelting temperature is 740-760 ℃; so that the raw materials are fully melted to obtain a melt with uniform and stable components. (2) And keeping the temperature of the molten aluminum at 730-760 ℃, refining the melt, removing slag inclusions in the melt, and adjusting the content of alloy components. (3) Degassing and filtering the melt, wherein the hydrogen content of the degassed melt is 0.086ml/100 gAl. (4) And (3) casting and molding the melt subjected to degassing and deslagging, and controlling the temperature of the molten aluminum of the casting platform to be 690-710 ℃. (5) Carrying out homogenization annealing treatment on the cast ingot, wherein the homogenization annealing process comprises the following steps: 360 +/-5 ℃/3.5h +420 +/-5 ℃/6h +470 +/-5 ℃/28h, and the heating rate is as follows: 40 +/-5 ℃/h. (6) Sawing and turning a skin of the ingot subjected to the homogenizing annealing treatment, preheating the skin-turned ingot, wherein the ingot preheating temperature is 430 ℃, and the temperature of the extrusion container is as follows: 460 ℃ ± 15 ℃, mold temperature: 450 +/-10 ℃, profile extrusion speed: 3 m/min. (7) And carrying out on-line solution quenching after extrusion forming, and cooling by water mist. (8) And (3) stretching and straightening the quenched section, wherein the initial stretching rate is 1.8%, the result is fed back through a residual stress detection system, R =76%, the stretching rate is adjusted to be 2.3%, and the supporting height of the section supporting roller is adjusted to be 10 mm. (9) Carrying out three-stage aging treatment on the section subjected to stretching straightening and stress removal; the first stage aging temperature is 30 +/-10 ℃, the temperature is kept for 120 hours, the second stage aging temperature is 90 ℃, the temperature is kept for 6 hours, the third stage aging temperature is 155 ℃, and the temperature is kept for 24 hours, so that a finished product can be obtained.
The aluminum alloy section prepared by the embodiment has tensile strength of 338Mpa and stress corrosion resistance I under the test conditions of 25 ℃ and 50 DEG CSRRT=3.7%、4.6%。
Example 2
In embodiment 2 of the present invention, the mass percentages of the elements of the aluminum alloy are shown in table 1, and the manufacturing method includes the following steps: (1) adding an industrial grade aluminum ingot with the purity of more than 99.70 percent and various required alloy elements for smelting, wherein the smelting temperature is 740-760 ℃, so that the raw materials are fully melted, and obtaining a melt with uniform and stable components. (2) And keeping the temperature of the molten aluminum at 730-760 ℃, refining the melt, removing slag inclusions in the melt, and adjusting the content of alloy components. (3) Degassing and filtering the melt, wherein the hydrogen content of the melt after degassing is 0.082ml/100 gAl. (4) And (3) casting and molding the melt subjected to degassing and deslagging, and controlling the temperature of the molten aluminum of the casting platform to be 690-710 ℃. (5) Carrying out homogenization annealing treatment on the cast ingot, wherein the homogenization annealing process comprises the following steps: 360 +/-5 ℃/4h +420 +/-5 ℃/7h +470 +/-5 ℃/30h, and the heating rate is as follows: 40 +/-5 ℃/h. (6) Sawing and turning a skin of the ingot subjected to the homogenizing annealing treatment, preheating the skin-turned ingot, wherein the ingot preheating temperature is 430 ℃, and the temperature of the extrusion container is as follows: 460 ℃ ± 10 ℃, mold temperature: 450 +/-10 ℃, profile extrusion speed: 4 m/min. (7) And carrying out on-line solution quenching after extrusion forming, and cooling by water mist. (8) And (3) stretching and straightening the quenched section, wherein the initial stretching rate is 2.0%, the length L of the stretched section is 14.9m, the result is fed back by a residual stress detection system, R =64%, and the support height of the section support roller is adjusted to 86 mm. (9) Carrying out three-stage aging treatment on the section subjected to stretching straightening and stress removal; the first stage aging temperature is 30 +/-10 ℃, the heat preservation time is 140 hours, the second stage aging temperature is 90 ℃, the heat preservation time is 10 hours, the third stage aging temperature is 160 ℃, and the heat preservation time is 20 hours, so that a finished product can be obtained.
The aluminum alloy section prepared by the implementation has the tensile strength of 337Mpa and the stress corrosion resistance I under the test conditions of 25 ℃ and 50 DEG CSRRT=3.2%、4.8%。
Example 3
In embodiment 3 of the present invention, the mass percentages of the elements of the aluminum alloy are shown in table 1, and the manufacturing method includes the following steps: (1) adding an industrial grade aluminum ingot with the purity of more than 99.70 percent and various required alloy elements for smelting, wherein the smelting temperature is 740-760 ℃, so that the raw materials are fully melted, and obtaining a melt with uniform and stable components. (2) And keeping the temperature of the molten aluminum at 730-760 ℃, refining the melt, removing slag inclusions in the melt, and adjusting the content of alloy components. (3) Degassing and filtering the melt, wherein the hydrogen content of the degassed melt is 0.085ml/100 gAl. (4) Casting and molding the degassed and deslagged melt, and controlling the temperature of molten aluminum of a casting platform to be 690-710 ℃; (5) carrying out homogenization annealing treatment on the cast ingot, wherein the homogenization annealing process comprises the following steps: 360 +/-5 ℃/4h +420 +/-5 ℃/8h +470 +/-5 ℃/36h, and the heating rate is as follows: 40 +/-5 ℃/h. (6) Sawing and turning a skin of the ingot subjected to the homogenizing annealing treatment, preheating the skin-turned ingot, wherein the ingot preheating temperature is 430 ℃, and the temperature of the extrusion container is as follows: 460 ℃ ± 10 ℃, mold temperature: 450 +/-5 ℃, profile extrusion speed: 5 m/min. (7) And carrying out on-line solution quenching after extrusion forming, and cooling by water mist. (8) And (3) stretching and straightening the quenched section, wherein the initial stretching rate is 2.4%, the length L of the stretched section is 14.8m, the result is fed back by a residual stress detection system, R =43%, and the support height of the section support roller is adjusted to 51 mm. (9) Carrying out three-stage aging treatment on the section subjected to stretching straightening and stress removal; the primary aging temperature is 30 +/-10 ℃, the heat preservation time is 190 hours, the secondary aging temperature is 100 ℃, the heat preservation time is 7 hours, the tertiary aging temperature is 165 ℃, and the heat preservation time is 14 hours, so that a finished product can be obtained.
The diffraction pattern of the extruded small-angle grain boundary grain structure of the aluminum alloy section of the embodiment is shown in FIG. 1, and the prepared aluminum alloy section has the tensile strength of 339Mpa and the stress corrosion resistance I under the test conditions of 25 ℃ and 50 DEG CSRRT=3.8%、4.9%。
Example 4
In embodiment 4 of the present invention, the mass percentages of the elements of the chemical composition are shown in table 1, and the manufacturing method includes the following steps: (1) adding an industrial grade aluminum ingot with the purity of more than 99.70 percent and various required alloy elements for smelting, wherein the smelting temperature is 740-760 ℃, so that the raw materials are fully melted, and obtaining a melt with uniform and stable components. (2) And keeping the temperature of the molten aluminum at 730-760 ℃, refining the melt, removing slag inclusions in the melt, and adjusting the content of alloy components. (3) Degassing and filtering the melt, wherein the hydrogen content of the melt after degassing is 0.082ml/100 gAl. (4) And (3) casting and molding the melt after degassing and deslagging, and controlling the temperature of the molten aluminum of the casting platform to be 690-710 ℃. (5) Carrying out homogenization annealing treatment on the cast ingot, wherein the homogenization annealing process comprises the following steps: 360 +/-5 ℃/3.5h +420 +/-5 ℃/6h +470 +/-5 ℃/30h, and the heating rate is as follows: 40 +/-5 ℃/h. (6) Sawing and turning a skin of the ingot subjected to the homogenizing annealing treatment, preheating the skin-turned ingot, wherein the ingot preheating temperature is 430 ℃, and the temperature of the extrusion container is as follows: 460 ℃ ± 15 ℃, mold temperature: 450 +/-10 ℃, profile extrusion speed: 4 m/min. (7) And carrying out on-line solution quenching and water cooling after extrusion forming. (8) And (3) stretching and straightening the quenched section, wherein the initial stretching rate is 2.8%, the length L of the stretched section is 16.7m, the result is fed back by a residual stress detection system, R =12%, and the support height of the section support roller is 11 mm. (9) Carrying out three-stage aging treatment on the section subjected to stretching straightening and stress removal; the first stage aging temperature is 30 +/-10 ℃, the heat preservation time is 200 hours, the second stage aging temperature is 90 ℃, the heat preservation time is 8 hours, the third stage aging temperature is 165 ℃, and the heat preservation time is 14 hours, so that a finished product can be obtained.
The aluminum alloy section prepared by the embodiment has tensile strength of 345Mpa and stress corrosion resistance I under the test conditions of 25 ℃ and 50 DEG CSRRT=4.1%、4.8%。
Comparative example 1
In the comparative example 1 of the invention, (1) an industrial-grade aluminum ingot with purity of more than 99.70% and various required alloy elements are added for smelting, the smelting temperature is 740-760 ℃, so that the raw materials are fully melted, and a melt with uniform and stable components is obtained. (2) And keeping the temperature of the molten aluminum at 730-760 ℃, refining the melt, removing slag inclusions in the melt, and adjusting the content of alloy components. (3) Degassing and filtering the melt, wherein the hydrogen content of the melt after degassing is 0.082ml/100 gAl. (4) And (3) casting and molding the melt after degassing and deslagging, and controlling the temperature of the molten aluminum of the casting platform to be 690-710 ℃. (5) Carrying out homogenization annealing treatment on the cast ingot, wherein the homogenization annealing process comprises the following steps: 360 +/-5 ℃/3.5h +420 +/-5 ℃/6h +470 +/-5 ℃/30h, and the heating rate is as follows: 40 +/-5 ℃/h. (6) Sawing and turning a skin of the ingot subjected to the homogenizing annealing treatment, preheating the skin-turned ingot, wherein the ingot preheating temperature is 430 ℃, and the temperature of the extrusion container is as follows: 460 ℃ ± 15 ℃, mold temperature: 450 +/-10 ℃, profile extrusion speed: 5 m/min. (7) And carrying out on-line solution quenching after extrusion forming, and cooling by water mist. (8) And (3) stretching and straightening the quenched section, wherein the initial stretching rate is 2.0%, the length L of the stretched section is 14.8m, the result is fed back by a residual stress detection system, R =68%, and the support height of the section support roller is adjusted to 92 mm. (9) Carrying out three-stage aging treatment on the section subjected to stretching straightening and stress removal; the first stage, the aging temperature is 30 +/-10 ℃, the heat preservation time is 150 hours, the second stage, the aging temperature is 90 ℃, the heat preservation time is 8 hours, the third stage, the aging temperature is 165 ℃, and the heat preservation time is 16 hours, so that a finished product can be obtained.
The aluminum alloy section prepared by the embodiment has tensile strength of 356MPa and stress corrosion resistance I under the test conditions of 25 ℃ and 50 DEG CSRRT=6.7%, 8.1%. Zn/Mg =7.0 for the present example, resulting in stress corrosion resistance ISRRT>5.0%。
Claims (8)
1. A preparation method of a high stress corrosion resistance Al-Zn-Mg-Cu aluminum alloy section is characterized by comprising the following steps: the high-stress-corrosion-resistance Al-Zn-Mg-Cu aluminum alloy profile comprises the following elements in percentage by mass: si is less than or equal to 0.1%, Fe is less than or equal to 0.1%, Cu = 0.12-0.14%, Mn = 0.23-0.25%, Mg = 0.75-0.8%, Cr = 0.15-0.17%, Zn = 5.7-5.8%, Zr = 0.16-0.19%, Ti = 0.02-0.04%, the Fe/Si ratio is 1.8-2.5, and the Zn/Mg ratio is controlled to be 7.1-7.7; each inevitable impurity element is less than 0.04 percent, the total amount of the inevitable impurity elements is less than 0.1 percent, and the balance is Al;
the preparation method comprises the following steps:
(1) smelting: weighing raw materials according to the component requirements of the aluminum alloy section, and putting the raw materials into a smelting furnace for smelting;
(2) refining: refining the melt, removing slag inclusion of the melt, and adjusting the content of alloy components;
(3) purifying the melt: degassing and filtering the melt by matching a degassing device and a filtering device to ensure that the hydrogen content in the melt is less than 0.10ml/100 gAl;
(4) casting;
(5) carrying out homogenization annealing;
(6) extruding;
(7) solution quenching;
(8) stretching and straightening and profile destressing: and (3) stretching and straightening the section after solution quenching, wherein the stretching ratio is as follows: 1.8-2.8%; in the process of stretching and straightening, stress sensors are arranged at two stretched ends of the profile, the percentage of the residual stress of the profile is fed back through the sensors, and the supporting height of the profile support rollers is adjusted to eliminate the residual stress of the profile;
(9) aging treatment, namely obtaining a finished product after the aging treatment is finished;
in the step (8), the method for adjusting the supporting height of the profile support roller comprises the following steps:
when the residual stress R of the material is detected to be less than 10% by the residual stress sensing equipment, adjusting the height of the highest point of the supporting roller to be 0 mm;
when the residual stress R of the material is detected as: when R is more than 10% and less than or equal to 30%, the supporting peak height of the supporting roller is adjusted as follows: h = L × 6R;
when the residual stress R of the material is detected as: when R is more than 30% and less than or equal to 50%, the supporting peak height of the supporting roller is adjusted as follows: h = L × 8R;
when the residual stress R of the material is detected as: when R is more than 50% and less than or equal to 70%, the supporting peak height of the supporting roller is adjusted as follows: h = L9R;
when the residual stress R of the material is detected as: when R is more than 70%, the supporting height of the supporting roller is adjusted to be 0-10 mm, and the tensile rate is increased by 0.2-0.5%;
h is the height of the supporting roller, and the unit is mm, and L is the length of the section bar, and the unit is m.
2. The method of claim 1, wherein: in the step (1), the smelting temperature is 740-760 ℃.
3. The method of claim 1, wherein: in the step (2), the refining temperature is 730-760 ℃.
4. The method of claim 1, wherein: in the step (4), the casting temperature is 690-710 ℃.
5. The method of claim 1, wherein: in the step (5), homogenizing annealing is carried out in a soaking furnace and is subjected to 3-level homogenizing annealing treatment; three-stage homogenization annealing process: in the first stage, the temperature is 360 +/-5 ℃, and the time is 3-4 hours; in the second stage, the temperature is 420 +/-5 ℃, and the time is 6-8 hours; thirdly, the temperature is 470 +/-5 ℃, and the time is 28-36 h; the heating rate is 40 +/-5 ℃/h.
6. The method of claim 1, wherein: in the step (6), the extrusion process comprises: preheating the cast ingot after the homogenizing annealing at 430 +/-15 ℃, and putting the cast ingot into an extrusion container for extrusion, wherein the temperature of the extrusion container is as follows: 460 ℃ ± 15 ℃, mold temperature: at the temperature of 450 +/-10 ℃; the extrusion speed of the section bar is 3-5 m/min.
7. The method of claim 1, wherein: in the step (7), the solution quenching comprises the following specific processes: carrying out on-line solution quenching on the extruded and formed section, wherein the quenching inlet temperature of the section is more than 440 ℃; the cooling medium is cooled by water mist.
8. The method of claim 1, wherein: in the step (9), three-stage aging treatment is adopted: in the first stage, the aging temperature is 30 +/-10 ℃, and the temperature is kept for 120-200 hours; in the second stage, the aging temperature is 90-100 ℃, and the temperature is kept for 6-10 hours; and thirdly, the aging temperature is 155-165 ℃, and the heat preservation is carried out for 14-24 hours.
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| CN111254331B (en) * | 2020-04-07 | 2021-12-28 | 台山市金桥铝型材厂有限公司 | Al-Zn-Mg alloy and preparation method thereof |
| CN112518259A (en) * | 2020-12-22 | 2021-03-19 | 许晨玲 | Leveling and heat treatment process for high-magnesium-content aluminum-magnesium alloy integral extrusion wallboard |
| CN112877624B (en) * | 2021-01-13 | 2022-01-18 | 广东省科学院材料与加工研究所 | Corrosion-resistant Al-Zn-Mg-Cu alloy, and preparation method and application thereof |
| CN112921255A (en) * | 2021-01-15 | 2021-06-08 | 烟台南山学院 | Method for reducing quenching residual stress of 7000 series aluminum alloy thick plate and aluminum alloy plate |
| CN113186434B (en) * | 2021-04-13 | 2022-06-28 | 上海交通大学 | Stress corrosion resistant aluminum alloy material for automobile and preparation method thereof |
| CN113957306B (en) * | 2021-09-17 | 2022-12-02 | 株洲中车时代电气股份有限公司 | Aluminum alloy section bar, preparation method thereof and application thereof in rail transit electric screen cabinet |
| CN114107848B (en) * | 2021-11-24 | 2022-11-29 | 中国兵器科学研究院宁波分院 | Method for reducing residual stress of aluminum alloy thin-wall component |
| CN114250392A (en) * | 2021-12-31 | 2022-03-29 | 亚太轻合金(南通)科技有限公司 | High-stress-corrosion-resistance Al-Zn-Mg aluminum alloy and preparation method thereof |
| CN114262829B (en) * | 2022-01-04 | 2022-07-15 | 辽宁忠旺集团有限公司 | 7-series aluminum alloy anti-collision cross beam profile for automobile and production process |
| CN117821815B (en) * | 2024-03-04 | 2024-06-04 | 鼎镁新材料科技股份有限公司 | High-strength coarse-grain-free Al-Zn-Mg-Cu aluminum alloy for motorcycle wheels and preparation method thereof |
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