Solid solution method of 2219 aluminum alloy high-rib wallboard based on AFSD

Abstract

The invention provides a solid solution method for a 2219 aluminum alloy high-rib wallboard based on AFSD. The solid solution method comprises the following steps that 1, the 2219 aluminum alloy high-rib wallboard based on AFSD is pretreated; step 2, constructing an electric pulse solid solution device; 3, pulse power supply parameters are adjusted; step 4, performing solid solution on the 2219 aluminum alloy high-rib wallboard based on AFSD; and 5, the 2219 aluminum alloy high-rib wall plate based on the AFSD is cooled through an air cooling device. According to the method, the AFSD-based 2219 aluminum alloy high-rib wall plate is heated through the pulsed power supply to complete solid solution of the AFSD-based 2219 aluminum alloy high-rib wall plate, the method has the core characteristics of local heat effect and instantaneous heating, the solid solution requirement of a second phase theta-Al2Cu in an additive area is met, meanwhile, the solid solution efficiency is greatly improved, and damage to a substrate area is avoided.

Description

Technical Field

[0001] This invention relates to a solution treatment method for 2219 aluminum alloy high-strength wall panels based on AFSD, belonging to the field of alloy manufacturing technology. Background Technology

[0002] Currently, the mainstream method for solution treatment of aluminum alloy components is as follows: the aluminum alloy component is heated as a whole using equipment such as a box furnace or vacuum furnace, and a specific temperature (usually 530-550℃) and holding time (1-2 hours) are controlled to dissolve the second phase into the aluminum matrix, thus completing the solution treatment of the aluminum alloy component. This method is suitable for traditional forged and rolled aluminum alloy workpieces with a high degree of homogenization. However, it has a long solution time, low efficiency, and cannot be adapted to the heterogeneous structure of aluminum alloy components based on AFSD. The two methods have the following core contradictions: if the dissolution requirement of the second phase in the additive region is met, the substrate region will be overheated, resulting in grain coarsening and a decrease in mechanical properties; if the stability of the substrate region is taken into account, the coarse second phase in the additive region cannot be fully dissolved, resulting in poor overall uniformity of the aluminum alloy component based on AFSD. Summary of the Invention

[0003] The purpose of this invention is to provide a solution treatment method for 2219 aluminum alloy high-strength wall panels based on AFSD, so as to solve the problems existing in the prior art.

[0004] To address the aforementioned technical problems, this invention provides a solution treatment method for 2219 aluminum alloy high-strength wall panels based on AFSD, comprising the following steps:

[0005] Step 1: Pre-treatment of AFSD-based 2219 aluminum alloy high-rib wall panel: The AFSD-based 2219 aluminum alloy high-rib wall panel includes a substrate area and an additive area. The additive area consists of multiple ribs uniformly arranged on the upper surface of the substrate area based on the additive process. The surface of the AFSD-based 2219 aluminum alloy high-rib wall panel is cleaned, and the volume fraction and particle size of the second phase θ-Al2Cu in the additive area and the substrate area are detected respectively.

[0006] Step 2: Set up the electro-pulse solid solution device: Clamp the positive and negative terminals of the pulse power supply to both ends of the 2219 aluminum alloy high-rib wall panel based on AFSD using copper conductive clamps. Arrange multiple detection heads of the temperature detection device on the additive manufacturing area and the substrate area respectively. Set up the air-cooling device with the air outlet of the air-cooling device located directly above the 2219 aluminum alloy high-rib wall panel based on AFSD. Set the initial values ​​of the pulse power supply parameters.

[0007] Step 3: Adjust the pulse power supply parameters: Start the pulse power supply and adjust the pulse power supply parameters in real time according to the temperature monitoring data of the additive zone, so that the temperature of the additive zone is stable within the second phase remelting temperature range of the additive zone, and the temperature of the substrate zone does not exceed the grain coarsening temperature of the substrate zone.

[0008] Step 4: Solution treatment of 2219 aluminum alloy high-rib wall panel based on AFSD: After setting the pulse power supply parameters, the 2219 aluminum alloy high-rib wall panel based on AFSD is subjected to the following instantaneous heating and natural cooling process in a cycle until the temperature of the additive zone is lower than the temperature range of the second phase remelting temperature of the additive zone, so as to complete the solution treatment of the 2219 aluminum alloy high-rib wall panel based on AFSD; Instantaneous heating and natural cooling process: Start the pulse power supply to heat the 2219 aluminum alloy high-rib wall panel based on AFSD. When the heating time reaches the set heating time, turn off the pulse power supply and let the 2219 aluminum alloy high-rib wall panel based on AFSD cool naturally. The natural cooling time is the preset natural cooling time.

[0009] Step 5: Cool the 2219 aluminum alloy high-strength wall panel based on AFSD using an air-cooling device.

[0010] In one specific implementation, step 5 is: turning on the air-cooling device to cool the AFSD-based 2219 aluminum alloy high-rib wall panel after solution treatment until its temperature is room temperature, and controlling the cooling rate to be ≥20℃ / s.

[0011] In one specific embodiment, the second phase remelting temperature range of the additive region is 510-540°C, and the grain coarsening temperature of the substrate region is 480°C.

[0012] In one specific implementation, the initial values ​​of the pulse power supply parameters are as follows: current of 1000 A, frequency of 1000 Hz, duty cycle of 50%, and heating time of 2 s.

[0013] In one specific implementation, the set heating time is greater than or equal to 1 second and less than or equal to 5 seconds, and the preset natural cooling time is greater than or equal to 5 seconds and less than or equal to 10 seconds.

[0014] In one specific embodiment, conductive paste is applied to the contact area between the copper conductive clamp and the AFSD-based 2219 aluminum alloy high-rib wall panel.

[0015] In one specific embodiment, the temperature detection device includes a data acquisition device and multiple thermocouples electrically connected thereto, with an accuracy of ±1℃.

[0016] In one specific implementation, the pulse power supply is a high-frequency square wave pulse power supply.

[0017] In one specific implementation, the pulse power supply is a sine wave pulse power supply or a sawtooth wave pulse power supply.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows.

[0019] This invention utilizes a pulsed power supply to heat an AFSD-based 2219 aluminum alloy high-ribbed wall panel to achieve solid solution treatment. It possesses the core characteristics of localized thermal effect and instantaneous heating. While meeting the solid solution requirements of the second phase θ-Al₂Cu in the additive region of the AFSD-based 2219 aluminum alloy high-ribbed wall panel, it significantly improves the solid solution efficiency and avoids damage to the substrate region of the AFSD-based 2219 aluminum alloy high-ribbed wall panel. Specifically:

[0020] 1. Significantly improved solution efficiency: The processing time is shortened to 10-20 seconds, greatly reducing the solution time and significantly improving the solution efficiency;

[0021] 2. Meets the solid solution requirements of 2219 aluminum alloy high-strength wall panels based on AFSD: The local thermal effect of electric pulse is precisely applied to the additive manufacturing area, and the dissolution rate of the second phase θ-Al2Cu in the additive manufacturing area is ≥90%. The dissolution uniformity is improved by more than 20% compared with traditional solid solution, which fully guarantees the mechanical properties of the component.

[0022] 3. Zero-damage protection of the substrate area: Under the action of instantaneous heating and local thermal effects, the substrate area generates low heat, keeping the temperature of the substrate area within a safe range, with no significant change in grain size and stable mechanical properties.

[0023] 4. Effective energy saving and cost reduction: Instantaneous heating reduces energy loss, with energy consumption reduced by 60-70% compared to traditional solid solution heating, and no complex insulation equipment is required, thus reducing production costs. Attached Figure Description

[0024] Figure 1 This is a flowchart of the solution treatment method for the 2219 aluminum alloy high-strength wall panel based on AFSD according to the present invention.

[0025] Figure 2 The present invention relates to an electropulse solid solution apparatus.

[0026] In the diagram: 1. Pulse power supply; 2. Temperature detection device; 3. Air cooling device; 4. Substrate area; 5. Additive manufacturing area. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0028] AFSD-based 2219 aluminum alloy high-strength wall panels are mainly used in aerospace, high-end equipment and other fields with stringent requirements for the uniformity of mechanical properties of aluminum alloy components.

[0029] refer to Figure 1A solution treatment method for 2219 aluminum alloy high-rib wall panel based on AFSD includes the following steps: Step 1: Pretreatment of 2219 aluminum alloy high-rib wall panel based on AFSD: The 2219 aluminum alloy high-rib wall panel based on AFSD includes a substrate region 4 and an additive region 5. The additive region 5 consists of multiple ribs uniformly arranged on the upper surface of the substrate region 4 based on additive manufacturing. The surface of the 2219 aluminum alloy high-rib wall panel based on AFSD is cleaned to remove oxide scale, oil stains and impurities to ensure smooth conductive paths. Specifically, the surface of the 2219 aluminum alloy high-rib wall panel based on AFSD is polished with 1200-grit sandpaper and ultrasonically cleaned with anhydrous ethanol for 15 minutes, and then dried at 60°C. The volume fraction and particle size of the second phase θ-Al2Cu in the additive region 5 and the substrate region 4 of the 2219 aluminum alloy high-rib wall panel based on AFSD are detected respectively to provide a basis for setting the initial values ​​of the pulse power supply parameters.

[0030] Step 2: Constructing the electro-pulse solution treatment device: The electro-pulse solution treatment device includes: a pulse power supply 1, a temperature detection device 2, and an air-cooling device 3. (Refer to...) Figure 2 The positive and negative terminals of the pulse power supply 1 are clamped to both ends of the 2219 aluminum alloy high-rib wall panel based on AFSD using copper conductive clamps. Multiple detection heads of the temperature detection device 2 are respectively arranged in the additive manufacturing area 5 and the substrate area 4 of the 2219 aluminum alloy high-rib wall panel based on AFSD. An air-cooling device 3 is installed, with its air outlet located directly above the 2219 aluminum alloy high-rib wall panel based on AFSD. Initial values ​​for the parameters of the pulse power supply 1 are set; preferably, the initial values ​​for the pulse power supply 1 are: current of 1000... A, with a frequency of 1000Hz, a duty cycle of 50%, and a heating time of 2s; conductive paste is applied to the contact area between the copper conductive clamp and the 2219 aluminum alloy high-rib wall plate based on AFSD to reduce contact resistance and avoid local overheating; preferably, the temperature detection device 2 is a data acquisition device and multiple thermocouples electrically connected to it, with an accuracy of ±1℃; preferably, the pulse power supply 1 is a high-frequency square wave pulse power supply; optionally, the pulse power supply 1 is a sine wave pulse power supply or a sawtooth wave pulse power supply;

[0031] Step 3: Adjust the parameters of pulse power supply 1: Start pulse power supply 1 and adjust the parameters of pulse power supply 1 in real time according to the temperature monitoring data of the temperature monitoring device of additive region 5, so that the temperature of additive region 5 is stable within the second phase dissolution temperature range of additive region 5, and the temperature of substrate region 4 does not exceed the grain coarsening temperature of substrate region 4; preferably, the second phase dissolution temperature range of additive region 5 is 510-540℃, and the grain coarsening temperature of substrate region 4 is 480℃;

[0032] Step 4: Solution treatment of 2219 aluminum alloy high-rib wall panel based on AFSD: After the parameters of pulse power supply 1 are set, the following instantaneous heating and natural cooling process is performed on the 2219 aluminum alloy high-rib wall panel based on AFSD until the temperature of additive zone 5 is lower than the second phase dissolution temperature range of additive zone 5, so as to complete the solution treatment of 2219 aluminum alloy high-rib wall panel based on AFSD; Instantaneous heating and natural cooling process: Pulse power supply 1 is started to heat the 2219 aluminum alloy high-rib wall panel based on AFSD. When the heating time reaches the set heating time, pulse power supply 1 is turned off to allow the 2219 aluminum alloy high-rib wall panel based on AFSD to cool naturally. The natural cooling time is the preset natural cooling time. Preferably, the set heating time is greater than or equal to 1s and less than or equal to 5s, and the preset natural cooling time is greater than or equal to 5s and less than or equal to 10s.

[0033] Step 5: Cool the 2219 aluminum alloy high-strength wall panel based on AFSD using the air-cooling device 3: Turn on the air-cooling device 3 and control the cooling rate to ≥20℃ / s to suppress the re-precipitation of the second phase θ-Al2Cu in the additive zone 5 during the cooling process, so as to stabilize the supersaturated solid solution state of the 2219 aluminum alloy high-strength wall panel based on AFSD.

[0034] The present invention will further demonstrate the detailed implementation process and technical effects of the solution treatment method for 2219 aluminum alloy high-strength wall panels based on AFSD as shown in steps 1 to 5 above through specific embodiments, so as to facilitate understanding of the essence of the present invention.

[0035] The experimental group used the present invention to perform solution treatment on 2219 aluminum alloy high-ribbed wall panels based on AFSD; the control group used the conventional solution treatment method to perform solution treatment on 2219 aluminum alloy high-ribbed wall panels based on AFSD.

[0036] The parameters of the 2219 aluminum alloy high-rib panel based on AFSD used in the experimental and control groups are as follows: the size of substrate region 4 is 100mm×50mm×6mm (length*width*height); the size of the rib based on additive manufacturing process is 100mm×4mm×40mm (length*width*height); the volume fraction of the second phase θ-Al2Cu in additive region 5 is 20%, and the average particle size is 3μm; the volume fraction of the second phase θ-Al2Cu in substrate region 4 is 5%, and the average particle size is 10μm.

[0037] The experimental group uses a high-frequency square wave pulse power supply with a maximum output current of 5400A, a frequency of 100-1000Hz, and a duty cycle of 10%-100%. The temperature detection device 2 of the experimental group includes a data acquisition device and multiple thermocouples electrically connected to it. Its measurement range is 200-800℃ and its accuracy is ±1℃.

[0038] The control group used a box-type resistance furnace with a temperature control accuracy of ±2℃ and a maximum temperature of 600℃.

[0039] Experimental group implementation steps:

[0040] 1. Pretreatment of AFSD-based 2219 aluminum alloy high-rib wall panel: The surface of the AFSD-based 2219 aluminum alloy high-rib wall panel was sanded with 1200 grit sandpaper and ultrasonically cleaned with anhydrous ethanol for 15 minutes, and then dried at 60℃.

[0041] 2. Constructing the electro-pulse solid solution device: Clamp the positive and negative terminals of the pulse power supply 1 to both ends of the 2219 aluminum alloy high-rib wall panel based on AFSD using copper conductive clamps. Align the patches of the two thermocouples with the center of the additive manufacturing area 5 and the center of the substrate area 4, respectively. Connect both thermocouples to the data acquisition device. Set up the air-cooling device 3. The air outlet of the air-cooling device 3 is located directly above the 2219 aluminum alloy high-rib wall panel based on AFSD, and the distance between the air outlet of the air-cooling device 3 and the 2219 aluminum alloy high-rib wall panel based on AFSD is 100mm. Set the initial values ​​of the pulse power supply 1 as follows: current of 1000 A, frequency of 1000 Hz, duty cycle of 50%, and heating time of 2s.

[0042] 3. Adjust the parameters of pulse power supply 1: Start pulse power supply 1 and adjust the parameters of pulse power supply 1 in real time according to the temperature monitoring data of the temperature monitoring device of additive region 5, so that the temperature of additive region 5 is stable within the second phase remelting temperature range of additive region 5, and the temperature of substrate region 4 does not exceed the grain coarsening temperature of substrate region 4.

[0043] 4. Solution treatment of 2219 aluminum alloy high-rib wall panel based on AFSD: After the parameters of pulse power supply 1 are set, the following instantaneous heating and natural cooling process is performed on the 2219 aluminum alloy high-rib wall panel based on AFSD until the temperature of additive zone 5 is lower than the second phase dissolution temperature range of additive zone 5, so as to complete the solution treatment of 2219 aluminum alloy high-rib wall panel based on AFSD; Instantaneous heating and natural cooling process: Pulse power supply 1 is started to heat the 2219 aluminum alloy high-rib wall panel based on AFSD. When the heating time reaches the set heating time, pulse power supply 1 is turned off and the 2219 aluminum alloy high-rib wall panel based on AFSD is allowed to cool naturally for 5 to 10 seconds.

[0044] 5. Cooling the 2219 aluminum alloy high-rib wall panel based on AFSD: Turn on the air cooling device 3 to cool the 2219 aluminum alloy high-rib wall panel based on AFSD that has completed solution treatment, and control the cooling rate to ≥20℃ / s.

[0045] Control group implementation steps:

[0046] 1. Pretreatment of AFSD-based 2219 aluminum alloy high-rib wall panel: The surface of the AFSD-based 2219 aluminum alloy high-rib wall panel was sanded with 1200 grit sandpaper and ultrasonically cleaned with anhydrous ethanol for 15 minutes, and then dried at 60℃.

[0047] 2. Place the 2219 aluminum alloy high-rib wall panel based on AFSD into a box-type resistance furnace, start the box-type resistance furnace, and heat the 2219 aluminum alloy high-rib wall panel based on AFSD to 530℃ at a heating rate of 5℃ / min. Hold the 2219 aluminum alloy high-rib wall panel based on AFSD at 530℃ for 1 hour to complete the solution treatment of the 2219 aluminum alloy high-rib wall panel based on AFSD.

[0048] 3. The AFSD-based 2219 aluminum alloy high-strength wall panel is cooled using an air-cooled cooling device 3.

[0049] The microstructure of the AFSD-based 2219 aluminum alloy high-stiffened wall panels in the experimental and control groups was observed using a metallographic microscope, and the mechanical properties of the AFSD-based 2219 aluminum alloy high-stiffened wall panels in the experimental and control groups were tested using a universal testing machine.

[0050] Solid solution efficiency: The solid solution time of the experimental group was only 20 seconds, while the solid solution time of the control group was 1 hour. The solid solution efficiency of the experimental group was 180 times higher than that of the control group, solving the problems of long solid solution time and low efficiency.

[0051] Microstructure: In the experimental group, the second phase θ-Al2Cu in the additive region 5 of the 2219 aluminum alloy high-stiffness wall panel based on AFSD had a dissolution rate ≥90% and an average grain size of 20μm. The grain size in the substrate region 4 was 2-3μm with no obvious coarsening. In the control group, the second phase θ-Al2Cu in the additive region 5 of the 2219 aluminum alloy high-stiffness wall panel based on AFSD had a dissolution rate of about 90%, and the grain size in the substrate region 4 was coarsened to 100μm.

[0052] Mechanical properties: In the experimental group, the tensile strength of additive region 5 of the 2219 aluminum alloy high-stiffness wall panel based on AFSD was ≥320MPa, the yield strength was ≥200MPa, and the elongation was ≥20%; in the control group, the tensile strength of additive region 5 of the 2219 aluminum alloy high-stiffness wall panel based on AFSD was ≥320MPa, the yield strength was ≥200MPa, and the elongation was ≥21%. In the experimental group, the tensile strength of substrate region 4 of the 2219 aluminum alloy high-stiffness wall panel based on AFSD was ≥350MPa, the yield strength was ≥270MPa, and the elongation was ≥15%; in the control group, the tensile strength of substrate region 4 of the 2219 aluminum alloy high-stiffness wall panel based on AFSD was ≥300MPa, the yield strength was ≥180MPa, and the elongation was ≥20%.

[0053] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions and substitutions can be made without departing from the inventive concept, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A method of solutionizing an AFSD-based 2219 aluminum alloy high-rib wall panel, the method characterized by, The method comprises the following steps: Step 1, pretreatment of the AFSD-based 2219 aluminum alloy high-gusset wallboard: the AFSD-based 2219 aluminum alloy high-gusset wallboard comprises a base plate area and an additive area, the additive area is a plurality of additive process-based gusset strips uniformly arranged on the upper surface of the base plate area, the surface of the AFSD-based 2219 aluminum alloy high-gusset wallboard is cleaned, and the volume fraction and particle size of the second phase θ-Al2Cu in the additive area and the base plate area are detected respectively; Step 2, build an electric pulse solid solution device: the positive and negative electrodes of the pulse power source are clamped at both ends of the AFSD-based 2219 aluminum alloy high-gusset wallboard through copper conductive clamps, a plurality of detection heads of a temperature detection device are arranged on the additive area and the base plate area respectively, a forced air cooling device is erected, the air outlet of the forced air cooling device is located directly above the AFSD-based 2219 aluminum alloy high-gusset wallboard, and initial values of pulse power source parameters are set; Step 3, adjust the pulse power source parameters: start the pulse power source, and adjust the pulse power source parameters in real time according to the temperature monitoring data of the additive area, so that the temperature of the additive area is stabilized in the second phase re-dissolution temperature interval of the additive area, and the temperature of the base plate area does not exceed the grain coarsening temperature of the base plate area; Step 4, solid solution of the AFSD-based 2219 aluminum alloy high-gusset wallboard: after the pulse power source parameters are set, the AFSD-based 2219 aluminum alloy high-gusset wallboard is subjected to the following instantaneous heating and natural cooling process in cycles until the temperature of the additive area is lower than the temperature of the second phase re-dissolution temperature interval of the additive area, so as to complete the solid solution of the AFSD-based 2219 aluminum alloy high-gusset wallboard; the instantaneous heating and natural cooling process: start the pulse power source, heat the AFSD-based 2219 aluminum alloy high-gusset wallboard, when the heating time reaches the set heating time, turn off the pulse power source, and let the AFSD-based 2219 aluminum alloy high-gusset wallboard cool naturally, and the natural cooling time is a natural cooling preset time; Step 5, cool the AFSD-based 2219 aluminum alloy high-gusset wallboard through the forced air cooling device.

2. The solution method of AFSD-based 2219 aluminum alloy high-rib wall panel according to claim 1, wherein, Step 5 is: turning on the forced air cooling device to cool the solid-solved AFSD-based 2219 aluminum alloy high-gusset wallboard until its temperature is room temperature, and the cooling rate is controlled to be greater than or equal to 20℃ / s.

3. The solution method of high gage wall sheets of AFSD-based 2219 aluminum alloy of claim 2, wherein, The second phase re-dissolution temperature interval of the additive area is 510-540℃, and the grain coarsening temperature of the base plate area is 480℃.

4. The solution method of high gage wall sheets of AFSD-based 2219 aluminum alloy of claim 3, wherein The initial values of the pulse power source parameters are respectively: current is 1000 A, frequency is 1000 Hz, duty cycle is 50%, and heating time is 2 s.

5. The AFSD-based solution method for high-gage wall sheets of 2219 aluminum alloy of claim 4, wherein, The set heating time is greater than or equal to 1 s and less than or equal to 5 s, and the natural cooling preset time is greater than or equal to 5 s and less than or equal to 10 s.

6. The solution method of high gage wall sheets of AFSD-based 2219 aluminum alloy of claim 5, wherein, The contact part of the copper conductive clamp and the AFSD-based 2219 aluminum alloy high-gusset wallboard is smeared with conductive paste.

7. The solution method of high gage wall sheets of AFSD-based 2219 aluminum alloy of claim 6, wherein The temperature detection device comprises a data acquisition device and a plurality of thermocouples electrically connected thereto, and the accuracy is ±1℃.

8. The solution method of high gage wall sheets of AFSD-based 2219 aluminum alloy of claim 7, wherein, The pulse power source is a high-frequency square wave pulse power source.

9. The solution method of high gage wall sheets of AFSD-based 2219 aluminum alloy of claim 8, wherein, The pulse power source is a sine wave pulse power source or a sawtooth wave pulse power source.

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