CN111575561A - Aluminum-lithium alloy for large-depth pressure-bearing shell and preparation method thereof - Google Patents
Aluminum-lithium alloy for large-depth pressure-bearing shell and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an aluminum-lithium alloy for a large-depth pressure-bearing shell and a preparation method thereof, wherein the aluminum-lithium alloy comprises the following metal raw materials in percentage by mass: 1.0-1.5% of Li, 3.2-5.0% of Cu, 0.2-1.0% of Mg, 0.4-0.9% of Ag, 0.08-0.18% of Zr, 0.1-0.5% of Mn, 0.2-1.0% of Zn, more than or equal to 0.05% of Si, more than or equal to 0.8% of Fe, more than or equal to 0.1% of Ti and the balance of Al; the preparation method comprises the following steps: (1) preparing materials; (2) spray forming to prepare an alloy ingot blank; (3) extruding; (4) forging and upsetting; (5) backward extrusion; (6) heat treatment; (7) stress relief and aging; the invention utilizes the modes of argon protection smelting and furnace refining to prepare high-quality melt with high cleanliness and low hydrogen content, and adopts the technologies of jet deposition and electromagnetic stirring to prepare the high-metallurgical-quality aluminum-lithium alloy ingot, and the problems of nonuniform structure, macrosegregation and the like of the aluminum-lithium alloy ingot are solved by the jet deposition process.
Description
Technical Field
The invention relates to the technical field of aluminum alloy preparation processes, in particular to an aluminum-lithium alloy for a large-depth pressure-bearing shell and a preparation method thereof.
Background
At present, most shells of weapons in water still adopt traditional metal materials. The U.S. shell of underwater weapons with high requirements on corrosion resistance and low requirements on strength adopts AA606l-T6 aluminum alloy, and the U.S. shell with high requirements on corrosion resistance and strength adopts AA7175-T73 aluminum alloy. Heavy underwater weapons with strong attack force are necessary weapons for killing and providing higher requirements for high strength, light weight, manufacturing technology and the like for aluminum alloy for large-depth pressure-bearing shells.
Lithium is the lightest metal element in the world. Lithium is added to metallic aluminum as an alloying element to form an aluminum-lithium alloy. After the addition of lithium, the specific gravity of the alloy can be reduced and the stiffness increased while still maintaining high strength, good corrosion and fatigue resistance and suitable ductility. Because of these characteristics, this new alloy has received a great deal of attention from the aerospace and marine industries. Due to the advantages of the alloy, many scientists are attracted to research the alloy, and the development of the aluminum-lithium alloy is developed as if the aluminum-lithium alloy is rapidly developed as a bamboo shoot in the spring after rain; the aluminum-lithium alloy has the characteristics of low density, high elastic modulus and high specific strength, and also has a plurality of excellent properties such as good fatigue property, excellent corrosion resistance, excellent plastic forming property, good weldability and the like. Therefore, the aluminum lithium alloy becomes the most potential metal structural material of the present weaponry.
The existing process for producing the aluminum-lithium alloy is to cast and solidify a prepared liquid alloy melt to form an aluminum-lithium alloy ingot blank, then apply one or more deformations such as extrusion, rolling, forging, ring rolling and the like to the ingot blank to enable the ingot blank to become a raw material or a component which can be used in aerospace, and the production links (including die casting, semi-continuous casting and the like) which usually relate to the solidification process are not the final process for producing parts, but due to the tissue inheritance phenomenon of metal materials, the material tissue formed in the solidification process almost accompanies the whole life cycle of the parts, once the inhomogeneity and coarse tissue morphology of chemical components occur in the solidification production link, the subsequent processing is difficult to effectively improve, and the performance of the parts is finally influenced;
the traditional casting method for preparing the aluminum-lithium alloy has the advantages that lithium is very active and is very easy to oxidize in the atmosphere, so that the burning loss of lithium in the casting process is very large, the lithium component is difficult to control, oxides are difficult to remove, meanwhile, a solution is easy to absorb hydrogen, inclusions and air holes are generated, and the performance, particularly the toughness of the material is seriously reduced; the spray forming technology is an advanced preparation technology for large-size ingots with high solidification and cooling speed and one-time near-net forming, can obtain fine and uniform microstructures, can greatly widen the supersaturated solid solubility of alloy elements, and provides an optimal technical scheme for solving the preparation problem for developing and preparing aluminum alloy structural materials with high magnesium, silicon and lithium contents.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an aluminum-lithium alloy for a large-depth pressure-bearing shell, which comprises the following metal raw materials in percentage by mass: li1.0-1.5%, Cu3.2-5.0%, Mg0.2-1.0%, Ag0.4-0.9%, Zr0.08-0.18%, Mn0.1-0.5%, Zn0.2-1.0%, Si ≦ 0.05%, Fe ≦ 0.8%, Ti ≦ 0.1%, and the balance of Al.
As further optimization of the technical scheme of the invention, the aluminum-lithium alloy for the large-depth pressure-bearing shell comprises the following metal raw materials in percentage by mass: li1.2-1.5%, Cu3.6-4.8%, Mg0.4-1.0%, Ag0.5-0.8%, Zr0.12-0.18%, Mn0.2-0.4%, Zn0.6-0.9%, Si ≦ 0.05%, Fe ≦ 0.8%, Ti ≦ 0.1%, and the balance of Al.
A preparation method of an aluminum-lithium alloy for a large-depth pressure-bearing shell comprises the following steps:
(1) preparing materials: weighing the materials according to the mass percentage of the chemical components of the alloy, and putting other raw materials except pure lithium into a smelting furnace for smelting; adding high-purity lithium ingot under the protection of inert gas, wherein the smelting temperature is 730-780 ℃, and forming a melt after melting; spreading a covering agent on the surface of the melt, degassing, deslagging and refining, then injecting molten aluminum into a tundish, and simultaneously introducing argon into the melt at the depth of 3/4 to refine for 30-60 min;
(2) preparing an alloy ingot blank by spray forming: after the melt is refined, transferring the melt into a drain ladle for electromagnetic stirring; atomizing liquid metal in the breakout ladle in an inert atmosphere to form a semi-solid spraying flow, depositing the semi-solid spraying flow on a receiving tray by controlling the technological parameters of a spray forming device, and solidifying to form an aluminum-lithium alloy ingot blank;
during the spray deposition process, the deposited molten metal continuously provides heat for the ingot blank, so that the ingot blank is kept at the temperature of 300-550 ℃ for a long time, and partial residual stress is eliminated. The spray-formed melt is atomized by inert gas to form micron-sized liquid drops, the micron-sized liquid drops are uniformly solidified on the deposition surface of the whole ingot blank, the internal and external cooling speeds are basically consistent, the macroscopic thermal stress is small, and the spray-formed ingot blank can be directly subjected to cold and hot processing without homogenization annealing due to the lower residual stress of the spray-formed ingot blank, so that the production cost is saved, and the production efficiency is improved.
(3) Extruding: turning off oxide skin of the aluminum lithium alloy ingot blank obtained in the step (2) to obtain an aluminum lithium alloy spraying light ingot, then returning the aluminum lithium alloy spraying light ingot to a furnace for heat preservation at the temperature of 420-460 ℃, preserving the heat for 8-24h to obtain a primary product, and performing hot processing extrusion densification on the primary product to obtain an extrusion bar;
specifically, in the extrusion process, the primary product gets into the recipient, and the stifled reality of blind mould is used earlier, and further densification, extrusion force are not more than 11000MN, and the dwell time is no less than 30s, and stifled reality process is accomplished, trades extrusion die and carries out forward extrusion, and the mould temperature: 420-460 ℃, extrusion barrel temperature: 420-: 0.1-1mm/s, extrusion ratio: 3-12; extruding equipment: 12500MN horizontal forward extruder, the diameter of the extrusion cylinder is 650 mm.
(4) Forging and upsetting: removing the tail of the extruded bar, flattening the end surface and the fillet of the extruded bar, then returning the extruded bar to the furnace for heat preservation, controlling the heat preservation temperature to be 430-500 ℃, and preserving the heat for at least 10 h; then, pressing down and upsetting the extruded bar by using a forging press, pressing down by adopting a point pressing mode, and performing rounding treatment when the bar is axially pressed down to 1/2 of the original height so as to eliminate bulging;
(5) and (3) reverse extrusion: adopting a reverse extruder to obtain a reverse extrusion pipe with the aperture not larger than 430mm after upsetting, and preserving the temperature of the extrusion pipe for at least 10h at the temperature of 440 ℃ and 480 ℃ before reverse extrusion; the reverse extrusion machine comprises an oil pressure forging machine, a punch head arranged on the oil pressure forging machine and a reverse extrusion die arranged right below the punch head;
specifically, a punch is arranged on an oil pressure forging machine, a backward extrusion die is arranged below the forging press to align the punch, an upset bar is placed in a backward extrusion cylinder, a compaction gasket is firstly used for compaction, the pressure maintaining time is not less than 60s, the gasket is taken out, the punch is aligned to the center of the bar, backward extrusion is carried out for multiple times, the bottom connecting skin part of the backward extrusion pipe is sawed after extrusion is finished, cracks are removed, machining is carried out on the inner surface and the outer surface of the backward extrusion pipe, the extrusion black skin is removed, and then ultrasonic flaw detection is carried out, so that the obtained backward extrusion pipe meets the A-level requirement in GJB 1580A-2004; wherein, the forging press is a 3000MN oil press, the diameter of the back extrusion cylinder is not less than 550mm, and the diameter of the punch is not more than 430 mm.
(6) And (3) heat treatment: sequentially carrying out solid solution, pre-deformation and aging treatment on the reversely extruded pipe;
(7) stress relief and aging: placing the reversely extruded pipe subjected to heat treatment on a vibration platform, and performing vibration aging; the vibration frequency of the vibration platform is 50-100Hz, and the time is 20-60 min; the absolute difference of the residual stress of the component after the vibration aging is not more than 100 MPa.
As a further optimization of the technical scheme of the invention, the covering agent is a mixture of LiCl and KCl.
As further optimization of the technical scheme of the invention, the electromagnetic field parameters of the electromagnetic stirring in the step (2) are as follows: the frequency is 10-15Hz, and the number of turns of the coil is 100-200.
As further optimization of the technical scheme of the invention, the process parameters of the spray forming equipment in the step (2) are as follows: the spray forming atomization gas is high-purity argon, the atomization pressure is 0.5-1.5MPa, the atomization temperature is 600-900 ℃, the rotating speed of a receiving disc is 20-60rpm, the descending speed of the receiving disc is 1-5mm/s, and the receiving distance is 300-500 mm; the deposition chamber for spray forming adopts argon protection, and positive pressure which is 0.5-1.5 times of the atmospheric environment pressure is kept in the spray process.
As a further optimization of the technical scheme of the invention, the pressing amount of the upsetting procedure in the step (4) is 10-30mm, and the pressing speed is not higher than 3 mm/s.
As further optimization of the technical scheme of the invention, the technological parameters of backward extrusion in the step (5) are as follows: the backward extrusion temperature is 440-480 ℃, the punch speed is not higher than 3mm/s, and the pressing amount is 400-500 mm.
As further optimization of the technical scheme of the invention, the heat treatment in the step (6) specifically comprises the following steps:
s01: solution treatment: heating the backward extrusion pipe to 500-520 ℃, preserving heat for at least 5h, and carrying out quenching treatment by using water with the temperature of 50-80 ℃, preferably water with the temperature of 60-70 ℃, wherein the quenching transfer is not more than 15 s;
s02: pre-deforming the reverse extrusion pipe subjected to the solution treatment in the step S01, wherein the deformation amount is 3-6%; preferably, pre-deformation is carried out by adopting a trestle expanding mode, the rotation quantity is controlled to be 20-30mm per time, and the rotation is carried out for 2-3 weeks;
s03: and (4) preserving the heat of the reverse extrusion pipe obtained in the step S02 at the temperature of 140-170 ℃ for 15-40h, and then discharging and air cooling.
The invention has the following beneficial effects: the invention utilizes the modes of argon protection smelting and furnace refining to prepare high-quality melt with high cleanliness and low hydrogen content, and adopts the technologies of jet deposition and electromagnetic stirring to prepare the high-metallurgical-quality aluminum-lithium alloy ingot, and the problems of nonuniform structure, macrosegregation and the like of the aluminum-lithium alloy ingot are solved by the jet deposition process; in addition, the density of the aluminum lithium alloy deposition ingot blank is improved by utilizing the hot extrusion deformation, and the aluminum lithium alloy component for high-performance weapon equipment can be prepared by the subsequent thermomechanical treatment process.
Drawings
FIG. 1 is a structural diagram of an aluminum lithium alloy according to the present invention in a spray state;
FIG. 2 is a metallographic structure of a backward extruded tube according to the invention.
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
Example 1
An aluminum-lithium alloy for a large-depth pressure-bearing shell comprises the following metal raw materials in percentage by mass: li1.15%, Cu4.13%, Mg0.48%, Ag0.56%, Zr0.14%, Mn0.33%, Zn0.8%, Si0.03%, Fe0.05%, Ti0.02%, and the balance of Al.
A preparation method of an aluminum-lithium alloy for a large-depth pressure-bearing shell comprises the following steps:
(1) preparing materials: weighing the materials according to the mass percentage of the chemical components of the alloy, and putting other raw materials except pure lithium into a smelting furnace for smelting; adding high-purity lithium ingots under the protection of inert gas, wherein the smelting temperature is 750 ℃, and forming a solution after the high-purity lithium ingots are molten; spreading a covering agent on the surface of the melt, degassing, deslagging and refining, then injecting molten aluminum into a tundish, and simultaneously introducing argon into the melt at the depth of 3/4 for refining for 45 min;
(2) preparing an alloy ingot blank by spray forming: after the melt is refined, transferring the melt into a drain ladle for electromagnetic stirring; atomizing liquid metal in the breakout ladle in an inert atmosphere to form a particle jet flow, depositing the particle jet flow on a receiving tray by controlling the technological parameters of a spray forming device, and solidifying to form an aluminum-lithium alloy ingot blank; wherein, the spray forming atomization gas is high-purity argon, the atomization pressure is 0.5-1.5MPa, the atomization temperature is 600-900 ℃, the rotating speed of the receiving disc is 20-60rpm, the descending speed of the receiving disc is 1-5mm/s, and the receiving distance is 300-500 mm; the deposition chamber for spray forming adopts argon protection, and positive pressure which is 0.5 to 1.5 times of the atmospheric environment pressure is kept in the spray process;
(3) extruding: turning off oxide skin of the aluminum lithium alloy ingot blank obtained in the step (2) to obtain an aluminum lithium alloy spraying light ingot, then returning the aluminum lithium alloy spraying light ingot to a furnace for heat preservation at the temperature of 445 ℃, preserving the heat for 20 hours to obtain a primary product, and performing hot working extrusion densification on the primary product to obtain an extruded bar;
(4) forging and upsetting: removing the tail of the extruded bar, turning the end surface of the extruded bar flat and rounding, and then returning the extruded bar to the furnace for heat preservation, wherein the heat preservation temperature is controlled to be 480 ℃, and the heat preservation is carried out for at least 10 hours; then, pressing down and upsetting the extruded bar by using a forging press, pressing down by adopting a point pressing mode, and performing rounding treatment when the bar is axially pressed down to 1/2 of the original height so as to eliminate bulging; the pressing amount is 25mm each time, and the pressing speed is not higher than 3 mm/s;
(5) and (3) reverse extrusion: after upsetting, adopting a reverse extruder to obtain a reverse extrusion pipe with the aperture not larger than 430mm, and preserving the temperature of the extrusion bar for at least 10 hours at 460 ℃ before reverse extrusion; the reverse extrusion machine comprises an oil pressure forging machine, a punch head arranged on the oil pressure forging machine and a reverse extrusion die arranged right below the punch head; the backward extrusion temperature is 450 ℃, the speed of a punch is not higher than 3mm/s, and the pressing amount is 450 mm;
(6) and (3) heat treatment: sequentially carrying out solid solution, pre-deformation and aging treatment on the reversely extruded pipe;
the heat treatment specifically comprises the following steps:
s01: solution treatment: heating the backward extrusion pipe to 515 ℃, preserving heat for at least 5h, and quenching by using water at the temperature of 60-70 ℃;
s02: pre-deforming the reverse extrusion pipe subjected to the solution treatment in the step S01, wherein the deformation amount is 3-6%;
s03: and (4) keeping the temperature of the backward extrusion pipe obtained in the step S02 at 165 ℃ for 35 hours, and then discharging from the furnace for air cooling.
(7) Stress relief and aging: and (4) placing the reversely extruded pipe subjected to heat treatment on a vibration platform for vibration aging.
Example 2
An aluminum-lithium alloy for a large-depth pressure-bearing shell comprises the following metal raw materials in percentage by mass: li1.25%, Cu3.89%, Mg0.67%, Ag0.69%, Zr0.12%, Mn0.42%, Zn0.47%, Si0.02%, Fe0.25%, Ti0.07%, and the balance of Al.
A preparation method of an aluminum-lithium alloy for a large-depth pressure-bearing shell comprises the following steps:
(1) preparing materials: weighing the materials according to the mass percentage of the chemical components of the alloy, and putting other raw materials except pure lithium into a smelting furnace for smelting; adding high-purity lithium ingot under the protection of inert gas, wherein the smelting temperature is 780 ℃, and forming a solution after melting; spreading a covering agent on the surface of the melt, degassing, deslagging and refining, then injecting molten aluminum into a tundish, and simultaneously introducing argon into the melt at the depth of 3/4 to refine for 60 min;
(2) preparing an alloy ingot blank by spray forming: after the melt is refined, transferring the melt into a drain ladle for electromagnetic stirring; atomizing liquid metal in the breakout ladle in an inert atmosphere to form a semi-solid spraying flow, depositing the semi-solid spraying flow on a receiving tray by controlling the technological parameters of a spray forming device, and solidifying to form an aluminum-lithium alloy ingot blank; wherein, the spray forming atomization gas is high-purity argon, the atomization pressure is 0.5-1.5MPa, the atomization temperature is 600-900 ℃, the rotating speed of the receiving disc is 20-60rpm, the descending speed of the receiving disc is 1-5mm/s, and the receiving distance is 300-500 mm; the deposition chamber for spray forming adopts argon protection, and positive pressure which is 0.5 to 1.5 times of the atmospheric environment pressure is kept in the spray process;
(3) extruding: turning off oxide skins of the aluminum lithium alloy ingot blank obtained in the step (2) to obtain an aluminum lithium alloy spraying light ingot, then returning the aluminum lithium alloy spraying light ingot to a furnace, preserving heat at 460 ℃, preserving heat for 24 hours to obtain a primary product, and performing hot working extrusion densification on the primary product to obtain an extrusion bar;
(4) forging and upsetting: removing the tail of the extruded bar, turning the end surface of the extruded bar flat and rounding, and then returning the extruded bar to the furnace for heat preservation, wherein the heat preservation temperature is controlled to be 445 ℃, and the heat preservation is carried out for at least 10 hours; then, pressing down and upsetting the extruded bar by using a forging press, pressing down by adopting a point pressing mode, and performing rounding treatment when the bar is axially pressed down to 1/2 of the original height so as to eliminate bulging; the pressing amount is 15mm each time, and the pressing speed is not higher than 3 mm/s;
(5) and (3) reverse extrusion: adopting a reverse extruder to obtain a reverse extrusion pipe with the aperture not larger than 430mm after upsetting, and preserving the temperature of the extrusion pipe for at least 10h at the temperature of 440 ℃ and 480 ℃ before reverse extrusion; the reverse extrusion machine comprises an oil pressure forging machine, a punch head arranged on the oil pressure forging machine and a reverse extrusion die arranged right below the punch head; the backward extrusion temperature is 440-480 ℃, the punch speed is not higher than 3mm/s, and the pressing amount is 400-500 mm;
(6) and (3) heat treatment: sequentially carrying out solid solution, pre-deformation and aging treatment on the reversely extruded pipe;
the heat treatment specifically comprises the following steps:
s01: solution treatment: heating the reverse extrusion pipe to 520 ℃, preserving heat for at least 5h, and quenching by using water at 60-70 ℃;
s02: pre-deforming the reverse extrusion pipe subjected to the solution treatment in the step S01, wherein the deformation amount is 3-6%;
s03: and (4) keeping the temperature of the backward extrusion pipe obtained in the step S02 at 160 ℃ for 25h, and then discharging and air cooling.
(7) Stress relief and aging: and (4) placing the reversely extruded pipe subjected to heat treatment on a vibration platform for vibration aging.
Performance testing
The results of the room temperature mechanical property tests of examples 1 and 2 are shown in table 1.
TABLE 1 mechanical Properties at room temperature of examples 1-2
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The aluminum-lithium alloy for the large-depth pressure-bearing shell is characterized by comprising the following metal raw materials in percentage by mass: 1.0-1.5% of Li, 3.2-5.0% of Cu, 0.2-1.0% of Mg, 0.4-0.9% of Ag, 0.08-0.18% of ZrC, 0.1-0.5% of Mn, 0.2-1.0% of Zn, less than or equal to 0.05% of Si, less than or equal to 0.8% of Fe, less than or equal to 0.1% of Ti and the balance of Al.
2. The aluminum-lithium alloy for the large-depth pressure-bearing shell according to claim 1, which is characterized by comprising the following metal raw materials in percentage by mass: 1.2 to 1.5 percent of Li, 3.6 to 4.8 percent of Cu, 0.4 to 1.0 percent of Mg, 0.5 to 0.8 percent of Ag, 0.12 to 0.18 percent of ZrC, 0.2 to 0.4 percent of Mn, 0.6 to 0.9 percent of Zn, less than or equal to 0.04 percent of Si, less than or equal to 0.6 percent of Fe, less than or equal to 0.08 percent of Ti and the balance of Al.
3. The preparation method of the aluminum-lithium alloy for the large-depth pressure-bearing shell as claimed in any one of claims 1 or 2 is characterized by comprising the following steps:
(1) preparing materials: weighing the materials according to the mass percentage of the chemical components of the alloy, and putting other raw materials except pure lithium into a smelting furnace for smelting; adding high-purity lithium ingot under the protection of inert gas, wherein the smelting temperature is 730-780 ℃, and forming a melt after melting; spreading a covering agent on the surface of the melt, degassing, deslagging and refining, then injecting molten aluminum into a tundish, and simultaneously introducing argon into the melt at the depth of 3/4 to refine for 30-60 min;
(2) preparing an alloy ingot blank by spray forming: after the melt is refined, transferring the melt into a drain ladle for electromagnetic stirring; atomizing liquid metal in the breakout ladle in an inert atmosphere to form a semi-solid spraying flow, depositing the semi-solid spraying flow on a receiving tray by controlling the technological parameters of a spray forming device, and solidifying to form an aluminum-lithium alloy ingot blank;
(3) extruding: turning off oxide skin of the aluminum lithium alloy ingot blank obtained in the step (2) to obtain an aluminum lithium alloy spraying light ingot, then returning the aluminum lithium alloy spraying light ingot to a furnace for heat preservation at the temperature of 420-460 ℃, preserving the heat for 8-24h to obtain a primary product, and performing hot processing extrusion densification on the primary product to obtain an extrusion bar;
(4) forging and upsetting: removing the tail of the extruded bar, flattening the end surface and the fillet of the extruded bar, then returning the extruded bar to the furnace for heat preservation, controlling the heat preservation temperature to be 430-500 ℃, and preserving the heat for at least 10 h; then, using a forging press to carry out downward pressing and upsetting on the extruded bar, and carrying out rounding treatment when the extruded bar is axially pressed down to 1/2 of the original height;
(5) and (3) reverse extrusion: adopting a reverse extruder to obtain a reverse extrusion pipe with the aperture not larger than 430mm after upsetting, and preserving the temperature of the extrusion pipe for at least 10h at the temperature of 440 ℃ and 480 ℃ before reverse extrusion; the reverse extrusion machine comprises an oil pressure forging machine, a punch head arranged on the oil pressure forging machine and a reverse extrusion die arranged right below the punch head;
(6) and (3) heat treatment: sequentially carrying out solid solution, pre-deformation and aging treatment on the reversely extruded pipe;
(7) stress relief and aging: and (4) placing the reversely extruded pipe subjected to heat treatment on a vibration platform for vibration aging.
4. The method for preparing the aluminum-lithium alloy for the large-depth pressure-bearing shell according to claim 3, wherein the covering agent is a mixture of LiCl and KCl.
5. The preparation method of the aluminum-lithium alloy for the large-depth pressure-bearing shell according to claim 3, wherein the electromagnetic field parameters of the electromagnetic stirring in the step (2) are as follows: the frequency is 10-15Hz, and the number of turns of the coil is 100-200.
6. The preparation method of the aluminum-lithium alloy for the large-depth pressure-bearing shell according to claim 3, wherein the process parameters of the injection molding equipment in the step (2) are as follows: the spray forming atomization gas is high-purity argon, the atomization pressure is 0.5-1.5MPa, the atomization temperature is 600-900 ℃, the rotating speed of a receiving disc is 20-60rpm, the descending speed of the receiving disc is 1-5mm/s, and the receiving distance is 300-500 mm; the deposition chamber for spray forming adopts argon protection, and the argon pressure is kept at 0.5-1.5 atm during the spray process.
7. The method for preparing the aluminum-lithium alloy for the large-depth pressure-bearing shell according to claim 3, wherein the pressing amount of the upsetting process in the step (4) is 10-30mm, and the pressing speed is not higher than 3 mm/s.
8. The preparation method of the aluminum-lithium alloy for the large-depth pressure-bearing shell according to claim 3, wherein the backward extrusion in the step (5) has the following process parameters: the backward extrusion temperature is 440-480 ℃, the punch speed is not higher than 3mm/s, and the pressing amount is 400-500 mm.
9. The preparation method of the aluminum-lithium alloy for the large-depth pressure-bearing shell according to claim 3, wherein the heat treatment in the step (6) comprises the following steps:
s01: solution treatment: heating the backward extrusion pipe to 500-520 ℃, preserving heat for at least 5h, and quenching by using water at 50-80 ℃;
s02: pre-deforming the reverse extrusion pipe subjected to the solution treatment in the step S01, wherein the deformation amount is 3-6%;
s03: and (4) preserving the heat of the reverse extrusion pipe obtained in the step S02 at the temperature of 140-170 ℃ for 15-40h, and then discharging and air cooling.
Priority Applications (1)
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| CN113215423A (en) * | 2021-04-16 | 2021-08-06 | 中南大学 | High-strength damage-resistant aluminum-lithium alloy and preparation method and application thereof |
| CN117144175A (en) * | 2023-11-01 | 2023-12-01 | 北京索德瀚智能科技有限公司 | Aluminum lithium alloy and preparation method thereof |
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| CN117144175B (en) * | 2023-11-01 | 2024-03-15 | 北京索德瀚智能科技有限公司 | Aluminum lithium alloy and preparation method thereof |
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