Methods, systems, and aluminum alloy extrusions to improve on-line quench performance of aluminum alloy extrusions

Abstract

This invention discloses a method, system, and aluminum alloy extruded material for improving the online quenching performance of aluminum alloy extruded materials, relating to the field of aluminum alloy extrusion technology. The method includes: between hot extrusion and online quenching, temperature compensation is performed on the aluminum alloy extruded material through induction heating to raise its temperature to a preset target temperature, controlling the time interval between the start of induction heating and the start of online quenching to not exceed 40 seconds. The system includes: an extruder, an online temperature measuring device one, an induction heating compensation device, an online temperature measuring device two, and an online quenching device arranged sequentially along the extrusion material's travel direction; and an induction heating compensation device control cabinet electrically connected to the online temperature measuring device one, online temperature measuring device two, and the induction heating compensation device, respectively. This invention allows the aluminum alloy to maintain its fibrous structure after extrusion while incorporating more Mg2Si into the matrix, achieving a solid solution effect, effectively reducing costs while ensuring high strength.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy extrusion technology, and specifically to a method, system, and aluminum alloy extrusion material for improving the online quenching performance of aluminum alloy extrusions. Background Technology

[0002] Aluminum alloy extrusions are heat-treatable alloys, requiring quenching and aging treatments after deformation to improve strength. Traditional offline quenching, while achieving high strength, is costly and cumbersome, reducing efficiency in large-scale industrial production. Online quenching, limited by extrusion temperature and solution treatment time, yields materials with lower strength. Therefore, to meet the strength requirements of aluminum alloy extrusions while minimizing production costs, it is urgent to develop a method that improves online quenching effects and yields high-strength aluminum alloy extrusions, achieving a technological breakthrough. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies by providing a method, system, and aluminum alloy extrusion material for improving the online quenching performance of aluminum alloy extrusions. Through online temperature measurement, real-time feedback, and online real-time temperature compensation, the online quenching temperature of the extruded aluminum alloy extrusion material is increased to the solution temperature, and the holding time of the compensation heating is controlled, thereby obtaining high-strength aluminum alloy extrusions.

[0004] In a first aspect, the present invention provides a method for improving the online quenching performance of aluminum alloy extrusions. An aluminum alloy ingot is hot-extruded to obtain an aluminum alloy extrusion. Between the hot extrusion and online quenching, induction heating is used to compensate for the temperature of the aluminum alloy extrusion, raising its temperature to a preset target temperature. The time interval between the start of induction heating and the start of online quenching is controlled to not exceed 40 seconds. The preset target temperature is the solution temperature of the aluminum alloy extrusion.

[0005] Furthermore, prior to the hot extrusion, the process includes melting and casting to prepare the aluminum alloy ingot; the raw material of the aluminum alloy ingot consists of the following components by mass percentage: Si 1%-1.2%, Mg 0.6%-0.8%, Cu 0.6%-0.8%, Mn 0.5%-0.7%, Zn 0.2%-0.3%, Fe <0.2%, with the balance being Al and unavoidable impurities.

[0006] Furthermore, the preset target temperature is 550℃-560℃.

[0007] Furthermore, the hot extrusion also includes: heating the aluminum alloy ingot to 500℃-530℃ for hot extrusion, controlling the temperature of the extrusion die to 490℃-500℃, the extrusion speed to 10m / min-20m / min, the extrusion pressure to 18MPa-20MPa, and the extrusion outlet temperature to 500℃-530℃, to obtain an aluminum alloy extruded material.

[0008] Furthermore, the online quenching is online water quenching.

[0009] Furthermore, after the online quenching, an aging treatment is also included: the quenched aluminum alloy extrusion is subjected to an aging treatment, held at 170±2℃ for 8-10 hours, and then cooled to room temperature.

[0010] Furthermore, the tensile strength of the aluminum alloy extruded material after the aging treatment is 440MPa-470MPa, the yield strength is 400MPa-430MPa, and the elongation after fracture is 12.5%-14.5%.

[0011] A second aspect of the present invention provides a system for improving the online quenching performance of aluminum alloy extruded materials, comprising: An extrusion press, an online temperature measuring device I, an induction heating compensation device, an online temperature measuring device II, and an online quenching device are sequentially arranged along the direction of travel of the aluminum alloy extruded material. An induction heating compensation device control cabinet, electrically connected to the online temperature measuring device I, the online temperature measuring device II, and the induction heating compensation device respectively, controls the time interval between the aluminum alloy extruded material entering the induction heating compensation device and entering the online quenching device to not exceed 40 seconds. The online temperature measuring device is installed at the outlet of the extruder and is used to measure the temperature of the aluminum alloy extruded material at the outlet of the extruder in real time. The induction heating compensation device is disposed between the extruder and the online quenching device, and is used to perform online compensation heating on the aluminum alloy extruded material; The online temperature measuring device 2 is installed at the outlet of the induction heating compensation device and is used to measure the temperature of the aluminum alloy extruded material after compensation heating in real time. The control cabinet of the induction heating compensation device is used to control the temperature of the aluminum alloy extruded material after passing through the induction heating compensation device and before entering the online quenching device to reach a preset target temperature, which is the solution treatment temperature of the aluminum alloy extruded material.

[0012] Furthermore, the control cabinet of the induction heating compensation device calculates the required compensation heat in real time and adjusts the output power of the induction heating compensation device based on the difference between the actual temperature measured by the online temperature measuring device one and the preset target temperature, as well as the cross-sectional area of ​​the aluminum alloy extruded material; and adjusts the output power of the induction heating compensation device in real time based on the comparison result between the actual temperature measured by the online temperature measuring device two and the preset target temperature, until the actual temperature measured by the online temperature measuring device two reaches the preset target temperature; the induction heating compensation device is an electromagnetic induction heating furnace.

[0013] In a third aspect, the present invention provides an aluminum alloy extrusion material prepared by the method described above, or prepared using the system described above.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects: (1) This invention optimizes the extrusion and subsequent solution aging processes, and improves the online quenching performance of aluminum alloy extrusions after extrusion, avoiding the cumbersome conventional offline quenching process. This achieves comparable strength while saving costs. Compared to conventional online quenching, the method for improving the online quenching performance of aluminum alloy extrusions involves online compensation heating and controlling the time the aluminum alloy extrusion is at the solution temperature to no more than 40 seconds. This ensures that while the aluminum alloy extrusion has a large amount of Mg2Si solid solution, grain growth does not occur, and a supersaturated solid solution is formed during subsequent online quenching. The time from the start of timing when the aluminum alloy extrusion enters the induction furnace to the start of quenching does not exceed 40 seconds, thus preventing the growth of the α-Al(Fe,Mn)Si nanophase, maintaining the fibrous structure of the extrusion, preventing recrystallization, and resulting in significant dislocation strengthening.

[0015] (2) The system for improving the online quenching performance of aluminum alloy extruded materials in this invention uses an online temperature measuring device to accurately measure the temperature at the extruder outlet and an induction heating compensation device control cabinet to calculate the amount of heat to be compensated in real time. Then, the induction heating compensation device heats the material to the preset target temperature before quenching. Only a small amount of heat needs to be added to bring the high-temperature extruded profile to the required solution temperature. This allows the aluminum alloy extruded material to maintain its fibrous structure after extrusion while incorporating more Mg2Si into the matrix, achieving a solution effect. This ensures high strength while saving time, electricity, and equipment usage, thereby effectively reducing costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments recorded in the embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 This is a schematic diagram of a high-temperature extrusion and online quenching device provided in an embodiment of the present invention.

[0018] Figure 2 This is an EBSD diagram of the aluminum alloy profile provided in Embodiment 1 of the present invention; wherein, Figure 2 a is the IPF diagram. Figure 2 b is the dislocation density map.

[0019] Figure 3 This is a TEM image of the aluminum alloy profile provided in Embodiment 1 of the present invention; wherein, Figure 3 a is a low-magnification precipitation phase diagram. Figure 3 b is a high-magnification precipitation phase diagram. Detailed Implementation

[0020] To better understand the above technical solutions, the technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0021] In a first aspect, this invention provides a method for improving the online quenching performance of aluminum alloy extrusions. An aluminum alloy ingot is hot-extruded to obtain an aluminum alloy extrusion. Between hot extrusion and online quenching, induction heating is used to compensate for the temperature of the aluminum alloy extrusion, raising its temperature to a preset target temperature. The time interval between the start of induction heating and the start of online quenching is controlled to be no more than 40 seconds. The preset target temperature is the solution temperature of the aluminum alloy extrusion.

[0022] It is understandable that aluminum alloy ingots are prepared by melting and casting prior to hot extrusion. Optionally, the raw materials for the aluminum alloy ingots consist of the following components by mass percentage: Si 1%-1.2%, Mg 0.6%-0.8%, Cu 0.6%-0.8%, Mn 0.5%-0.7%, Zn 0.2%-0.3%, Fe <0.2%, with the balance being Al and unavoidable impurities.

[0023] Specifically, to obtain a higher Mg2Si solid solubility, the preset target temperature was set to 550℃-560℃. Because the Mg2Si phase dissolves relatively quickly, extrusion was performed at a higher temperature, followed by additional compensating heating. This online compensating heating ensured that the alloy remained at 550℃-560℃ for no more than 40 seconds. In this way, the profile formed a large amount of Mg2Si solid solution while preventing grain growth. This resulted in a supersaturated solid solution during subsequent online quenching, while simultaneously preventing the growth of the α-Al(Fe,Mn)Si nanophase. The extruded material maintained its fibrous structure, did not recrystallize, and exhibited significant dislocation strengthening.

[0024] Optionally, hot extrusion includes: heating an aluminum alloy ingot to 500℃-530℃ for hot extrusion, controlling the temperature of the extrusion die to 490℃-500℃, the extrusion speed to 10m / min-20m / min, the extrusion pressure to 18MPa-20MPa, and the extrusion outlet temperature to 500℃-530℃, to obtain an aluminum alloy extruded material.

[0025] Optionally, online quenching is performed using online water quenching. After online quenching, aging treatment is carried out: the quenched aluminum alloy extrusion is held at 170±2℃ for 8-10 hours, and then cooled to room temperature. The tensile strength of the aged aluminum alloy extrusion is 440MPa-470MPa, the yield strength is 400MPa-430MPa, and the elongation after fracture is 12.5%-14.5%.

[0026] A second aspect of the present invention provides a system for improving the online quenching performance of aluminum alloy extruded materials, comprising: An extrusion press, an online temperature measuring device I, an induction heating compensation device, an online temperature measuring device II, and an online quenching device are sequentially arranged along the direction of travel of the aluminum alloy extruded material. An induction heating compensation device control cabinet, electrically connected to the online temperature measuring device I, online temperature measuring device II, and induction heating compensation device respectively, controls the time interval between the aluminum alloy extruded material entering the induction heating compensation device and entering the online quenching device to not exceed 40 seconds. An online temperature measuring device is installed at the outlet of the extruder to measure the temperature of the aluminum alloy extruded material at the extruder outlet in real time. An induction heating compensation device is installed between the extruder and the online quenching device to provide online compensation heating for aluminum alloy extruded materials. The second online temperature measuring device is installed at the outlet of the induction heating compensation device to measure the temperature of the aluminum alloy extruded material after compensation heating in real time. The induction heating compensation device control cabinet is used to control the temperature of the aluminum alloy extruded material after passing through the induction heating compensation device and before entering the online quenching device to reach the preset target temperature, which is the solution treatment temperature of the aluminum alloy extruded material.

[0027] Optionally, the induction heating compensation device is an electromagnetic induction heating furnace.

[0028] like Figure 1 As shown, an online temperature measuring device 1 is installed at the extruder outlet to measure the temperature in real time. Then, based on the pre-input cross-sectional area of ​​the aluminum alloy extruded material, the electromagnetic induction heating furnace control cabinet calculates the temperature to be compensated in real time and calculates the heat to be compensated. An electromagnetic induction heating furnace is set up between the extruder and the online quenching device, and the power of the electromagnetic induction heating furnace is adjusted in real time to perform online short-term temperature compensation. An online temperature measuring device 2 is installed at the outlet of the electromagnetic induction heating furnace to measure the temperature in real time and compare it with the preset target temperature. The output power of the electromagnetic induction heating furnace is adjusted in real time until the temperature measured by the online temperature measuring device 2 is consistent with the preset target temperature.

[0029] Example 1: A preparation method for improving the online quenching performance of aluminum alloy extruded materials (I) Preparation method As shown in Table 1, the alloy composition ratios, when used to obtain ingots through semi-continuous casting, also include the following steps: (1) High-temperature extrusion and online quenching After the ingot is held at 510℃, it is immediately removed for hot extrusion. Online temperature measuring device 1 measures the extruder outlet temperature to be approximately 510℃. Subsequently, it enters an electromagnetic induction heating furnace for reheating. The compensation temperature is set to 550℃ via the electromagnetic induction heating furnace control cabinet, and online temperature measuring device 2 measures the furnace outlet temperature to be 550℃. Online water quenching then follows. By controlling the extrusion speed, the time from the profile entering the induction furnace to the start of quenching is 38 seconds.

[0030] (2) Timeliness processing The obtained extruded profiles are subjected to peak aging heat treatment: held at 170℃ for 8 to 10 hours, and finally cooled to room temperature.

[0031] (II) Performance Status EBSD image of Al-Mg-Si alloy after aging heat treatment is shown below Figure 2 As shown, from Figure 2 As can be seen, the aluminum alloy, after being quenched and aged following temperature compensation by a heating device, still exhibits a fibrous microstructure with numerous subgrains and textures. Its transmission electron microscopy (TEM) image is shown below. Figure 3 As shown, from Figure 3 It can be seen that after high-temperature extrusion quenching and aging, the alloy microstructure contains a large number of fine and dispersed α-Al(Fe,Mn)Si phases, Q(Al5Cu2Mg8Si6) phases and Mg2Si phases. Its mechanical properties are shown in Table 2, with a tensile strength of 443 MPa, a yield strength of 401 MPa, and an elongation of 12.5%.

[0032] Example 2: A preparation method for improving the online quenching performance of aluminum alloy extruded materials (I) Preparation method As shown in Table 1, the alloy composition ratios, when used to obtain ingots through semi-continuous casting, also include the following steps: (1) High-temperature extrusion and online quenching After the ingot is held at 520℃, it is immediately removed for hot extrusion. Online temperature measuring device 1 measures the extruder outlet temperature to be approximately 520℃. Subsequently, it enters an electromagnetic induction heating furnace for reheating. The compensation temperature is set to 550℃ via the electromagnetic induction heating furnace control cabinet, and online temperature measuring device 2 measures the furnace outlet temperature to be 550℃. Online water quenching then follows. By controlling the extrusion speed, the time from the initial entry of the profile into the induction furnace to the start of quenching is 35 seconds.

[0033] (2) Timeliness processing The obtained extruded profiles are subjected to peak aging heat treatment: held at 170℃ for 8 to 10 hours, and finally cooled to room temperature.

[0034] (II) Performance Status The mechanical properties are shown in Table 2. Its tensile strength is 446 MPa, yield strength is 409 MPa, and elongation is 13.1%.

[0035] Example 3: A preparation method for improving the online quenching performance of aluminum alloy extruded materials (I) Preparation method As shown in Table 1, the alloy composition ratios, when used to obtain ingots through semi-continuous casting, also include the following steps: (1) High-temperature extrusion and online quenching After the ingot is held at 520℃, it is immediately removed for hot extrusion. Online temperature measuring device 1 measures the extruder outlet temperature at approximately 530℃. Subsequently, it enters an electromagnetic induction heating furnace for reheating. The compensation temperature is set to 550℃ via the electromagnetic induction heating furnace control cabinet, and online temperature measuring device 2 measures the furnace outlet temperature at 550℃. Following this, online water quenching is performed. By controlling the extrusion speed, the time from the profile entering the induction furnace to the start of quenching is 30 seconds.

[0036] (2) Timeliness processing The obtained extruded profiles are subjected to peak aging heat treatment: held at 170℃ for 8 to 10 hours, and finally cooled to room temperature.

[0037] (II) Performance Status The mechanical properties are shown in Table 2. Its tensile strength is 454 MPa, yield strength is 415 MPa, and elongation is 13.7%.

[0038] Example 4: A preparation method for improving the online quenching performance of aluminum alloy extruded materials (I) Preparation method As shown in Table 1, the alloy composition ratios, when used to obtain ingots through semi-continuous casting, also include the following steps: (1) High-temperature extrusion and online quenching After the ingot is held at 510℃, it is immediately removed for hot extrusion. Online temperature measuring device 1 measures the extruder outlet temperature to be approximately 510℃. Subsequently, it enters an electromagnetic induction heating furnace for reheating. The compensation temperature is set to 560℃ via the electromagnetic induction heating furnace control cabinet, and online temperature measuring device 2 measures the furnace outlet temperature to be 560℃. Online water quenching then follows. By controlling the extrusion speed, the time from the initial entry of the profile into the induction furnace to the start of quenching is 28 seconds.

[0039] (2) Timeliness processing The obtained extruded profiles are subjected to peak aging heat treatment: held at 170℃ for 8 to 10 hours, and finally cooled to room temperature.

[0040] (II) Performance Status The mechanical properties are shown in Table 2. Its tensile strength is 453 MPa, yield strength is 418 MPa, and elongation is 14.2%.

[0041] Example 5: A preparation method for improving the online quenching performance of aluminum alloy extruded materials (I) Preparation method As shown in Table 1, the alloy composition ratios, when used to obtain ingots through semi-continuous casting, also include the following steps: (1) High-temperature extrusion and online quenching After the ingot is held at 520℃, it is immediately removed for hot extrusion. Online temperature measuring device 1 measures the extruder outlet temperature to be approximately 520℃. Subsequently, it enters an electromagnetic induction heating furnace for reheating. The compensation temperature is set to 560℃ via the electromagnetic induction heating furnace control cabinet, and online temperature measuring device 2 measures the furnace outlet temperature to be 560℃. Online water quenching then follows. By controlling the extrusion speed, the time from the profile entering the induction furnace to the start of quenching is 23 seconds.

[0042] (2) Timeliness processing The obtained extruded profiles are subjected to peak aging heat treatment: held at 170℃ for 8 to 10 hours, and finally cooled to room temperature.

[0043] (II) Performance Status The mechanical properties are shown in Table 2. Its tensile strength is 462 MPa, yield strength is 423 MPa, and elongation is 13.8%.

[0044] Example 6: A preparation method for improving the online quenching performance of aluminum alloy extruded materials (I) Preparation method As shown in Table 1, the alloy composition ratios, when used to obtain ingots through semi-continuous casting, also include the following steps: (1) High-temperature extrusion and online quenching After the ingot is held at 530℃, it is immediately removed for hot extrusion. Online temperature measuring device 1 measures the extruder outlet temperature to be approximately 530℃. Subsequently, it enters an electromagnetic induction heating furnace for reheating. The compensation temperature is set to 560℃ via the electromagnetic induction heating furnace control cabinet, and online temperature measuring device 2 measures the furnace outlet temperature to be 560℃. Online water quenching then follows. By controlling the extrusion speed, the time from the profile entering the induction furnace to the start of quenching is 20 seconds.

[0045] (2) Timeliness processing The obtained extruded profiles are subjected to peak aging heat treatment: held at 170℃ for 8 to 10 hours, and finally cooled to room temperature.

[0046] (II) Performance Status The mechanical properties are shown in Table 2. Its tensile strength is 467 MPa, yield strength is 426 MPa, and elongation is 14.4%.

[0047] Comparative Example 1 (I) Preparation method As shown in Table 1, the alloy composition ratios, when used to obtain ingots through semi-continuous casting, also include the following steps: (1) High-temperature extrusion and online quenching After the ingot is kept at 530°C, it is immediately taken out for hot extrusion. The extrusion outlet temperature is about 530°C, and then it is quenched in water online.

[0048] (2) Time-related processing: Same as in Example 1.

[0049] (II) Performance Status The mechanical properties are shown in Table 2.

[0050] Comparative Example 2 (I) Preparation method As shown in Table 1, the alloy composition ratios, when used to obtain ingots through semi-continuous casting, also include the following steps: (1) High-temperature extrusion and online quenching After the ingot is kept at 560°C, it is immediately taken out for hot extrusion. The extrusion outlet temperature is about 560°C, and it is then heated in an induction heating furnace with a compensation temperature of 560°C. The extrusion speed is controlled so that the time from when the profile enters the induction furnace to when it begins to be quenched is 38 seconds.

[0051] (2) Time-related processing: Same as in Example 1.

[0052] (II) Performance Status The mechanical properties are shown in Table 2.

[0053] Comparative Example 3 (I) Preparation method As shown in Table 1, the alloy composition ratios, when used to obtain ingots through semi-continuous casting, also include the following steps: (1) High-temperature extrusion and online quenching After the ingot is held at 530℃, it is immediately removed for hot extrusion. Online temperature measuring device 1 measures the extruder outlet temperature to be approximately 530℃. Subsequently, it enters an electromagnetic induction heating furnace for reheating. The compensation temperature is set to 560℃ via the electromagnetic induction heating furnace control cabinet, and online temperature measuring device 2 measures the furnace outlet temperature to be 560℃. Following this, online water quenching is performed. By controlling the extrusion speed, the time from the initial entry of the profile into the induction furnace to the start of quenching is 2 minutes.

[0054] (2) Time-related processing: Same as in Example 1.

[0055] (II) Performance Status The mechanical properties are shown in Table 2.

[0056] Comparative Example 4 (I) Preparation method As shown in Table 1, the alloy composition ratios, when used to obtain ingots through semi-continuous casting, also include the following steps: (1) High-temperature extrusion and online quenching After the ingot is held at 520℃, it is immediately removed for hot extrusion. Online temperature measuring device 1 measures the extruder outlet temperature to be approximately 520℃. Subsequently, it enters an electromagnetic induction heating furnace for reheating. The compensation temperature is set to 560℃ via the electromagnetic induction heating furnace control cabinet, and online temperature measuring device 2 measures the furnace outlet temperature to be 560℃. Online water quenching then follows. By controlling the extrusion speed, the time from the initial entry of the profile into the induction furnace to the start of quenching is 5 minutes.

[0057] (2) Time-related processing: Same as in Example 1.

[0058] (II) Performance Status The mechanical properties are shown in Table 2.

[0059] Comparative Example 5 (I) Preparation method As shown in Table 1, the alloy composition ratios, when used to obtain ingots through semi-continuous casting, also include the following steps: (1) High-temperature extrusion and online quenching After the ingot is held at 510℃, it is immediately removed for hot extrusion. Online temperature measuring device 1 measures the extruder outlet temperature to be approximately 510℃. Subsequently, it enters an electromagnetic induction heating furnace for reheating. The compensation temperature is set to 560℃ via the electromagnetic induction heating furnace control cabinet, and online temperature measuring device 2 measures the furnace outlet temperature to be 560℃. Following this, online water quenching is performed. By controlling the extrusion speed, the time from the initial entry of the profile into the induction furnace to the start of quenching is 10 minutes.

[0060] (2) Time-related processing: Same as in Example 1.

[0061] (II) Performance Status The mechanical properties are shown in Table 2.

[0062] Comparative Example 6 (I) Preparation method As shown in Table 1, the alloy composition ratios, when used to obtain ingots through semi-continuous casting, also include the following steps: (1) High-temperature extrusion and online quenching After the ingot is kept at 510℃, it is immediately taken out for hot extrusion. The temperature at the extruder outlet is measured to be about 510℃. Then it is air-cooled and solution-treated at 560℃ for 30-40 minutes.

[0063] (2) Time-related processing: Same as in Example 1.

[0064] (II) Performance Status The mechanical properties are shown in Table 2.

[0065] Comparative Example 7 (I) Preparation method As shown in Table 1, the alloy composition ratios, when used to obtain ingots through semi-continuous casting, also include the following steps: (1) High-temperature extrusion and online quenching After the ingot is kept at 560°C, it is immediately taken out for hot extrusion. The temperature at the extruder outlet is measured to be about 560°C. Then it is air-cooled and solution-treated at 560°C for 30-40 minutes.

[0066] (2) Time-related processing: Same as in Example 1.

[0067] (II) Performance Status The mechanical properties are shown in Table 2.

[0068] Table 1. Mass percentage of alloy composition in the examples and comparative examples.

[0069] Table 2 Mechanical properties of the embodiments and comparative examples

[0070] Results Analysis Examples 1-6 illustrate that after high-temperature extrusion, a short-term rapid heating to 550℃-560℃ (no more than 40 seconds) resulted in superior performance while preserving the fibrous structure and exhibiting a greater number of precipitates. Comparative Example 1 shows that the conventional online quenching temperature is too low to allow for sufficient solid solution formation before quenching. Comparative Example 2 shows that after extrusion at 560℃, even with a short subsequent heating time, the excessively high extrusion temperature prevented the maintenance of the alloy's fibrous structure. Comparative Examples 3-5 show that after holding for more than 40 seconds, grain growth occurred, weakening the fine-grain strengthening and texture strengthening effects, resulting in lower strength compared to the examples. Comparative Examples 6-7 show that after normal offline quenching followed by conventional solution aging, the long solution time caused recrystallization in the alloy, thus resulting in lower strength. The examples and comparative examples show that short-term heating in an electromagnetic induction furnace after high-temperature extrusion can effectively promote the dissolution of Mg2Si and prevent grain recrystallization, resulting in higher texture strengthening and dispersion strengthening, and achieving higher mechanical properties than traditional online quenching and offline quenching.

[0071] It will be readily understood by those skilled in the art that the above-described advantageous methods can be freely combined and superimposed without conflict. The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A method for improving the online quenching performance of aluminum alloy extruded materials, characterized in that, Aluminum alloy ingots are hot-extruded to obtain aluminum alloy extruded materials. Between the hot extrusion and online quenching, the aluminum alloy extruded materials are temperature-compensated by induction heating to raise the temperature of the aluminum alloy extruded materials to a preset target temperature, and the time interval between the start of induction heating and the start of online quenching is controlled to not exceed 40 seconds; wherein, the preset target temperature is the solution temperature of the aluminum alloy extruded materials.

2. The method according to claim 1, characterized in that, Prior to the hot extrusion, the process also includes melting and casting to prepare the aluminum alloy ingot; the raw material of the aluminum alloy ingot consists of the following components by mass percentage: Si 1%-1.2%, Mg 0.6%-0.8%, Cu 0.6%-0.8%, Mn 0.5%-0.7%, Zn 0.2%-0.3%, Fe <0.2%, with the balance being Al and unavoidable impurities.

3. The method according to claim 1 or 2, characterized in that, The preset target temperature is 550℃-560℃.

4. The method according to claim 1 or 2, characterized in that, The hot extrusion further includes: heating the aluminum alloy ingot to 500℃-530℃ for hot extrusion, controlling the temperature of the extrusion die to 490℃-500℃, the extrusion speed to 10m / min-20m / min, the extrusion pressure to 18MPa-20MPa, and the extrusion outlet temperature to 500℃-530℃, to obtain an aluminum alloy extruded material.

5. The method according to claim 1 or 2, characterized in that, The online quenching is online water quenching.

6. The method according to claim 1 or 2, characterized in that, After the online quenching, an aging treatment is also included: the quenched aluminum alloy extrusion is subjected to an aging treatment, held at 170±2℃ for 8-10 hours, and then cooled to room temperature.

7. The method according to claim 6, characterized in that, The aluminum alloy extrusions after the aging treatment have a tensile strength of 440MPa-470MPa, a yield strength of 400MPa-430MPa, and an elongation after fracture of 12.5%-14.5%.

8. A system for improving the online quenching performance of aluminum alloy extruded materials, characterized in that, The system for implementing the method according to any one of claims 1-7 comprises: An extrusion press, an online temperature measuring device I, an induction heating compensation device, an online temperature measuring device II, and an online quenching device are sequentially arranged along the direction of travel of the aluminum alloy extruded material. An induction heating compensation device control cabinet, electrically connected to the online temperature measuring device I, the online temperature measuring device II, and the induction heating compensation device respectively, controls the time interval between the aluminum alloy extruded material entering the induction heating compensation device and entering the online quenching device to not exceed 40 seconds. The online temperature measuring device is installed at the outlet of the extruder and is used to measure the temperature of the aluminum alloy extruded material at the outlet of the extruder in real time. The induction heating compensation device is disposed between the extruder and the online quenching device, and is used to perform online compensation heating on the aluminum alloy extruded material; The online temperature measuring device 2 is installed at the outlet of the induction heating compensation device and is used to measure the temperature of the aluminum alloy extruded material after compensation heating in real time. The control cabinet of the induction heating compensation device is used to control the temperature of the aluminum alloy extruded material after passing through the induction heating compensation device and before entering the online quenching device to reach a preset target temperature, which is the solution treatment temperature of the aluminum alloy extruded material.

9. The system according to claim 8, characterized in that, The control cabinet of the induction heating compensation device calculates the required heat compensation in real time and adjusts the output power of the induction heating compensation device based on the difference between the actual temperature measured by the online temperature measuring device one and the preset target temperature, as well as the cross-sectional area of ​​the aluminum alloy extruded material; and adjusts the output power of the induction heating compensation device in real time based on the comparison between the actual temperature measured by the online temperature measuring device two and the preset target temperature, until the actual temperature measured by the online temperature measuring device two reaches the preset target temperature; the induction heating compensation device is an electromagnetic induction heating furnace.

10. An aluminum alloy extruded material, characterized in that, It is prepared by the method described in any one of claims 1-7, or by the system described in any one of claims 8-9.

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