CN109097710B - Extrusion method of high-magnesium aluminum alloy pipe - Google Patents
Extrusion method of high-magnesium aluminum alloy pipe Download PDFInfo
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- CN109097710B CN109097710B CN201810943558.1A CN201810943558A CN109097710B CN 109097710 B CN109097710 B CN 109097710B CN 201810943558 A CN201810943558 A CN 201810943558A CN 109097710 B CN109097710 B CN 109097710B
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- 238000001125 extrusion Methods 0.000 title claims abstract description 69
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 39
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 238000001192 hot extrusion Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000002425 crystallisation Methods 0.000 claims abstract description 15
- 239000000155 melt Substances 0.000 claims abstract description 14
- 230000008025 crystallization Effects 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims abstract description 5
- 238000003754 machining Methods 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 13
- 239000011777 magnesium Substances 0.000 claims description 12
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 11
- 229910052749 magnesium Inorganic materials 0.000 claims description 11
- 238000004321 preservation Methods 0.000 claims description 11
- 238000007670 refining Methods 0.000 claims description 9
- 238000000641 cold extrusion Methods 0.000 claims description 8
- 230000005484 gravity Effects 0.000 claims description 7
- 230000032683 aging Effects 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 238000010791 quenching Methods 0.000 claims description 5
- 230000000171 quenching effect Effects 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 238000010622 cold drawing Methods 0.000 claims description 4
- 229910052706 scandium Inorganic materials 0.000 claims description 4
- 229910052726 zirconium Inorganic materials 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 abstract description 11
- 229910000861 Mg alloy Inorganic materials 0.000 abstract description 8
- 238000002360 preparation method Methods 0.000 abstract description 3
- 238000005266 casting Methods 0.000 description 12
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910020363 KCl—MgCl2 Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004227 thermal cracking Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/08—Making wire, bars, tubes
- B21C23/085—Making tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/04—Casting hollow ingots
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Extrusion Of Metal (AREA)
- Forging (AREA)
Abstract
The invention discloses an extrusion method of a high-magnesium aluminum alloy pipe, belonging to the field of aluminum alloy processing, and the technical scheme has the following key points: the method comprises the following steps: s1: preparing a hollow blank by rotary crystallization, and preparing a melt into a hollow ingot by a rotary crystallization method; s2: machining a hollow cast ingot; s3: double-stage solution heat treatment; s4: hot extrusion, namely performing semi-perforation hot extrusion on the hollow cast ingot prepared in the step S3 to form a hot extrusion pipe blank, wherein the extrusion speed is 2-10 m/min, the temperature of an extrusion cylinder used for the semi-perforation hot extrusion is 280 +/-20 ℃, the temperature of a die is 360 +/-20 ℃, and the extrusion ratio is 5-12; s5: intermediate heat treatment; s6: and (3) cold deformation, namely performing plastic deformation on the pipe blank treated by the S5 through a cold deformation process to obtain the high-magnesium aluminum alloy pipe with high strength and toughness. The invention solves the problem that high magnesium aluminum alloy is difficult to plastically deform, and provides the preparation method of the aluminum-magnesium alloy pipe with ultrahigh strength and toughness.
Description
Technical Field
The invention relates to the field of aluminum alloy processing, in particular to an extrusion method of a high-magnesium aluminum alloy pipe.
Background
The aluminum-magnesium alloy is an alloy which is added with metal magnesium in the aluminum alloy, is a non-heat-treatable strengthened aluminum alloy, has the advantages of high specific strength, good weldability, good corrosion resistance and the like, and is widely applied to the fields of aerospace, transportation, petrochemical industry, rail transit, consumer electronics and the like. The addition amount of magnesium element in the aluminum-magnesium alloy in the prior industry is generally not more than 7 percent, and the alloy belongs to medium-strength alloy, and the strength range is generally 380 to 420 MPa. Therefore, it is necessary to design an aluminum alloy with a high magnesium addition.
Since it has been thought that the aluminum alloy with a high magnesium content cannot be plastically deformed successfully, the aluminum alloy pipe with a high magnesium content has never been used in the field. In order to meet more requirements of production and life, the necessity of developing the high-magnesium aluminum alloy pipe with ultrahigh strength and toughness is increasingly remarkable.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an extrusion method of a high-magnesium aluminum alloy pipe, which has the advantages that: can provide an aluminum-magnesium alloy pipe with ultrahigh strength and toughness, and the prepared pipe has higher strength and higher toughness.
The technical purpose of the invention is realized by the following technical scheme: the extrusion method of the high-magnesium aluminum alloy pipe comprises the following steps:
s1: preparing a hollow ingot by rotary crystallization: melting an aluminum ingot, adding other elements except magnesium in the high-magnesium aluminum alloy, adding a refining agent for refining, standing for 10-30 min, adding the magnesium ingot, adding a grain refiner, adjusting the casting temperature to 700-760 ℃, and preparing the melt into a hollow ingot by adopting a rotary crystallization method;
s2: machining the hollow ingot in the step S1;
s3: double-stage solution heat treatment: preserving the heat of the hollow cast ingot machined in the step S2 at 350-420 ℃ for 10-36 h, then raising the temperature to 580-630 ℃, preserving the heat for 10-24 h, and then quenching the hollow cast ingot;
s4: and (3) hot extrusion process: performing semi-perforation hot extrusion on the hollow cast ingot prepared in the step S3 to form a hot extrusion pipe blank; before the semi-perforation hot extrusion begins, the hollow cast ingot is kept at the temperature of 400 +/-20 ℃ for 30 min-1 h, meanwhile, the temperature of an extrusion cylinder used for the semi-perforation hot extrusion is heated to 280 +/-20 ℃, and the temperature of a die is heated to 360 +/-20 ℃;
the extrusion speed during extrusion is 2-10 m/min, and the extrusion ratio is 5-12.
S5: intermediate heat treatment: preserving the heat of the hot-extruded tube blank in the step S4 for 0.3-1.5 h at the temperature of 500 +/-20 ℃, and cooling to room temperature;
s6: and (3) cold deformation process: and (5) performing plastic deformation on the pipe blank processed in the step S5 through a cold deformation process to obtain the high-magnesium aluminum alloy pipe with high strength and toughness.
According to the technical scheme, the high-magnesium-content tubular casting blank with a fine microstructure and no shrinkage porosity and thermal cracking defects can be obtained, the components of the high-magnesium-content casting blank can be distributed more uniformly through double-stage solution treatment, the wall thickness of the casting blank can be reduced through hot extrusion, and the mechanical property can be improved through cold deformation.
The invention is further configured to: s1, when the hollow cast ingot is prepared by adopting a rotary crystallization method, the gravity coefficient G is adjusted to be 50-300, and the rotating speed is adjusted to be 300-3000 r/min; and cooling the prepared hollow cast ingot to room temperature.
The invention is further configured to: the high-magnesium alloy in the S1 comprises the following components in percentage by mass:
mg: 7-13%, Mn: 0-1.0%, Cr: 0-0.5%, Sc: 0-0.35%, Zr: 0-0.3%, Ti: 0.005-0.2%, Be: 0.0001-0.01%, the balance being aluminum and unavoidable impurity elements.
The invention is further configured to: and the quenching mode of the hollow ingot casting in the S3 is water cooling.
The invention is further configured to: the extrusion manner in the hot extrusion in S4 is a forward extrusion manner.
The invention is further configured to: the extrusion mode in the hot extrusion in S4 is a backward extrusion mode.
The invention is further configured to: and cooling the hot-extruded pipe blank to room temperature in an air cooling mode in the S5.
The invention is further configured to: the cold deformation process in S6 is a cold drawing process, the secondary processing rate of each die is 10-30%, and the drawing rate is 1-10 m/min.
The invention is further configured to: the cold deformation process in S6 is a cold extrusion process, the extrusion speed is 0.5-5 m/min, and the extrusion ratio is 1.5-5.
The invention is further configured to: the preparation method further comprises the step of S7: and (4) aging and straightening, namely aging the pipe obtained in the step S6 according to the required mechanical property.
In conclusion, the invention has the following beneficial effects:
1. adding 7-13 wt% of magnesium element, and adding alloy elements such as Mn, Cr, Sc, Zr, Ti and the like to make the alloy become a heat-treatable strengthened type, thereby greatly expanding the application range of the aluminum-magnesium alloy;
2. the hollow cast ingot is produced in a rotary crystallization mode, the cast ingot has small crystal grains, uniform tissue and high density, and the subsequent semi-perforation hot extrusion is convenient to carry out;
3. the optimized heat treatment process, the hot extrusion process, the cold drawing process and the cold extrusion process are combined, so that the feasibility of plastic deformation of the high-magnesium aluminum alloy is ensured in a multi-level manner;
4. the tensile strength of the aluminum-magnesium alloy pipe prepared by the invention can reach 650MPa, the yield strength can reach 580MPa, and the elongation after fracture is more than or equal to 8%.
Detailed Description
Example 1:
the extrusion method of the high-magnesium aluminum alloy pipe comprises the following steps:
s1: preparing a high magnesium aluminum alloy hollow ingot by rotary crystallization, wherein the high magnesium aluminum alloy comprises the following elements in percentage by mass: mg: 7%, Mn: 0.6%, Sc: 0.15%, Ti: 0.1%, Be: 0.005% and the balance of Al and inevitable impurity elements; the preparation method comprises the following steps: melting weighed industrial pure aluminum ingot in a medium frequency induction furnace, adding 0.2 wt% of KCl-MgCl2Refining the melt by using a type refining agent, standing for 10min, adding a weighed industrial pure magnesium ingot, adding 0.2 wt% of a grain refiner (Al-5Ti-0.2C), adjusting the temperature of the melt to 720 ℃, and preparing the melt into a hollow ingot by using a rotary crystallization method, wherein the specific operation is as follows: adjusting the parameter gravity coefficient G of the rotary casting machine to 163, and pouring the melt into the rotary casting machine at a rotating speed of 1500 r/min; after solidification is finished, stopping the rotary casting machine, taking out the hollow cast ingot and cooling the hollow cast ingot to room temperature in air;
s2: machining the hollow cast ingot, turning the outer side surface of the hollow cast ingot in the step S1 by 5-15 mm, boring the inner side surface by 5-15 mm, and milling two end surfaces;
s3: two-stage solution heat treatment, namely setting the temperature of the heat treatment furnace to 350 ℃, putting the hollow ingot machined in the step S2 into the heat treatment furnace, preserving the heat for 12 hours, then raising the temperature to 630 ℃, preserving the heat for 12 hours, and then air-cooling the hollow ingot to the room temperature;
s4: hot extrusion, namely performing semi-perforation hot extrusion on the hollow cast ingot prepared in the step S3 to form a hot extrusion pipe blank, heating a heat treatment furnace to 380 ℃ before the semi-perforation hot extrusion is started, then putting the hollow cast ingot into the heat treatment furnace at 380 ℃ and preserving heat for 30min, simultaneously heating an extrusion barrel of an extruder to 280 +/-20 ℃, heating an extrusion die to 360 +/-20 ℃, performing reverse extrusion at an extrusion rate of 9m/min and an extrusion ratio of 10, and air cooling the extrusion blank to room temperature;
s5: performing intermediate heat treatment, setting the temperature of the heat treatment furnace to be 500 +/-20 ℃, putting the hot-extruded tube blank in the step S4 into the heat treatment furnace, preserving the heat for 0.5h, and air-cooling to room temperature;
s6: cold deformation, namely performing cold extrusion deformation on the pipe blank processed in the step S5 at an extrusion speed of 5m/min and an extrusion ratio of 4 to obtain a high-strength high-toughness magnesium aluminum alloy pipe;
s7: and (4) aging and straightening, namely aging the pipe obtained in the step S6 according to the required mechanical property.
Example 2:
the extrusion method of the high-magnesium aluminum alloy pipe is carried out according to the method in the embodiment 1, and the difference is that: step S1, adding a refining agent to refine the melt, standing for 15min, adding a grain refiner to adjust the melt temperature to 700 ℃, adjusting the gravity coefficient G of a rotary casting machine to 300 during rotary crystallization, and adjusting the rotating speed to 3000 r/min;
in step S3, the machined hollow cast ingot is placed into a heat treatment furnace with the temperature set to 350 ℃, the heat preservation time is 10 hours, and then the temperature is raised to 580 ℃ and is preserved for 10 hours;
in step S4, the extrusion rate is 2m/min and the extrusion ratio is 5;
in step S6, the extrusion speed of the cold extrusion deformation was 0.5m/min, and the extrusion ratio was 1.5.
Example 3:
the extrusion method of the high-magnesium aluminum alloy pipe is carried out according to the method in the embodiment 1, and the difference is that: step S1, adding a refining agent to refine the melt and standing for 15min, adjusting the temperature of the melt to 730 ℃ after adding a grain refiner, adjusting the gravity coefficient G of a rotary casting machine to 175 during rotary crystallization, and adjusting the rotating speed to 1800 r/min;
in step S3, the machined hollow cast ingot is placed into a heat treatment furnace with the temperature set to 385 ℃, the heat preservation time is 23 hours, then the temperature is raised to 605 ℃, and the heat preservation time is 17 hours;
in step S4, the extrusion rate is 6m/min and the extrusion ratio is 8.5;
in the step S5, the hot extrusion pipe blank is put into a heat treatment furnace for heat preservation for 0.9 h;
in step S6, the extrusion speed of the cold extrusion deformation was 2.5m/min and the extrusion ratio was 3.5.
Example 4:
the extrusion method of the high-magnesium aluminum alloy pipe is carried out according to the method in the embodiment 1, and the difference is that: step S1, adding a refining agent to refine the melt and standing for 20min, adjusting the temperature of the melt to 760 ℃ after adding a grain refiner, adjusting the gravity coefficient G of a rotary casting machine to 50 during rotary crystallization, and adjusting the rotating speed to 300 r/min;
in the step S3, the machined hollow cast ingot is placed into a heat treatment furnace with the temperature set to 420 ℃, the heat preservation time is 36 hours, then the temperature is raised to 630 ℃ and the heat preservation is carried out for 24 hours;
in step S4, the extrusion rate is 10m/min and the extrusion ratio is 12;
in the step S5, the hot extrusion pipe blank is put into a heat treatment furnace for heat preservation for 1.5 h;
in step S6, the extrusion speed of the cold extrusion deformation was 5m/min and the extrusion ratio was 5.
Example 5:
the extrusion method of the high-magnesium aluminum alloy pipe is carried out according to the method in the embodiment 1, and the difference is that: the extrusion manner in the step S4 is reverse extrusion;
the cold-forming process in step S6 is a cold-drawing process, the secondary processing rate of each die is 20%, and the drawing rate is 5 m/min.
Example 6
The extrusion method of the high-magnesium aluminum alloy pipe is carried out according to the method in the embodiment 1, and the difference is that:
the alloy elements added in the step S1 comprise the following components in percentage by mass:
mg: 12%, Mn: 0.4%, Zr: 0.2%, Ti: 0.1%, Be: 0.005 percent, and the balance of Al and inevitable impurity elements, wherein the inevitable impurity elements comprise less than or equal to 0.1 percent of Fe and less than or equal to 0.05 percent of Si;
after adding a grain refiner, regulating the temperature of the melt to 750 ℃, regulating the gravity coefficient G of a rotary casting machine to 100 during rotary crystallization, and regulating the rotating speed to 1000 r/min;
in the step S3, the machined hollow cast ingot is placed into a heat treatment furnace with the temperature set to 420 ℃, the heat preservation time is 24 hours, and then the temperature is raised to 620 ℃ and is preserved for 24 hours;
in step S4, the extrusion rate is 5m/min and the extrusion ratio is 8;
in the step S5, the hot extrusion pipe blank is put into a heat treatment furnace for heat preservation for 0.5 h;
in step S6, the extrusion speed of the cold extrusion deformation was 5m/min and the extrusion ratio was 4.
Performance testing
The performance test result of the aluminum-magnesium alloy pipe with ultrahigh strength and toughness is as follows:
| performance parameter | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 |
| Tensile strength/MPa | 530 | 480 | 500 | 550 | 570 | 650 |
| Yield strength/MPa | 420 | 380 | 400 | 440 | 460 | 580 |
| Elongation after Break (%) | 14 | 18 | 16 | 12 | 10 | 8 |
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. The extrusion method of the high-magnesium aluminum alloy pipe is characterized by comprising the following steps of: the method comprises the following steps:
s1: preparing a hollow ingot by rotary crystallization, melting an aluminum ingot, adding other elements except magnesium in the high-magnesium aluminum alloy, adding a refining agent for refining, standing for 10-30 min, adding the magnesium ingot, adding a grain refiner, adjusting the pouring temperature to 700-760 ℃, and then preparing the melt into the hollow ingot by a rotary crystallization method, wherein the content of Mg in the high-magnesium aluminum alloy is as follows: 7% -12%, Mn: 0.4% -0.6%, Sc: 0.15%, Zr: 0.2%, Ti: 0.1%, Be: 0.005 percent, and the balance of Al and inevitable impurity elements, wherein the inevitable impurity elements comprise less than or equal to 0.1 percent of Fe and less than or equal to 0.05 percent of Si;
s2: machining the hollow ingot in the step S1;
s3: performing double-stage solution heat treatment, namely performing heat preservation on the hollow cast ingot machined in the step S2 at 350-420 ℃ for 10-36 hours, then raising the temperature to 580-630 ℃, performing heat preservation for 10-24 hours, and then performing quenching treatment on the hollow cast ingot;
s4: performing hot extrusion, namely performing semi-perforation hot extrusion on the hollow cast ingot prepared in the step S3 to form a hot extrusion pipe blank, before the semi-perforation hot extrusion is started, preserving the heat of the hollow cast ingot at the temperature of 400 +/-20 ℃ for 30 min-1 h, heating the temperature of an extrusion cylinder to 280 +/-20 ℃, and heating the temperature of a die to 360 +/-20 ℃; the extrusion speed during extrusion is 2-10 m/min, and the extrusion ratio is 5-12;
s5: performing intermediate heat treatment, namely, preserving the heat of the hot-extruded pipe blank in the step S4 for 0.3-1.5 h at the temperature of 500 +/-20 ℃, and cooling to room temperature;
s6: performing cold deformation process, namely performing plastic deformation on the pipe blank treated in the step S5 through the cold deformation process to obtain a high-magnesium aluminum alloy pipe with high strength and toughness;
s7: and (4) aging and straightening, namely aging the pipe obtained in the step S6 according to the required mechanical property.
2. The extrusion method of high-magnesium aluminum alloy pipe as recited in claim 1, wherein:
s1, when the hollow cast ingot is prepared by adopting a rotary crystallization method, the gravity coefficient G is adjusted to be 50-300, and the rotating speed is adjusted to be 300-3000 r/min; and cooling the prepared hollow cast ingot to room temperature.
3. The extrusion method of high-magnesium aluminum alloy pipe as recited in claim 1, wherein: and the quenching mode of the S3 hollow cast ingot is water quenching.
4. The extrusion method of high-magnesium aluminum alloy pipe as recited in claim 1, wherein: the extrusion manner in the hot extrusion in S4 is a forward extrusion manner.
5. The extrusion method of high-magnesium aluminum alloy pipe as recited in claim 1, wherein: the extrusion mode in the hot extrusion in S4 is a backward extrusion mode.
6. The extrusion method of high-magnesium aluminum alloy pipe as recited in claim 1, wherein: and cooling the hot-extruded pipe blank to room temperature in an air cooling mode in the S5.
7. The extrusion method of high-magnesium aluminum alloy pipe as recited in claim 1, wherein: the cold deformation process in S6 is a cold drawing process, the secondary processing rate of each die is 10-30%, and the drawing rate is 1-10 m/min.
8. The extrusion method of high-magnesium aluminum alloy pipe as recited in claim 1, wherein: the cold deformation process in S6 is a cold extrusion process, the extrusion speed is 0.5-5 m/min, and the extrusion ratio is 1.5-5.
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| CN201810943558.1A CN109097710B (en) | 2018-08-17 | 2018-08-17 | Extrusion method of high-magnesium aluminum alloy pipe |
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| CN201810943558.1A CN109097710B (en) | 2018-08-17 | 2018-08-17 | Extrusion method of high-magnesium aluminum alloy pipe |
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| CN112899534B (en) * | 2021-01-26 | 2022-03-11 | 康硕(山西)智能制造有限公司 | High-strength high-magnesium aluminum alloy and casting process thereof |
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