CN115679170B - Preparation method of high-quality large-specification 7085 aluminum alloy cast ingot - Google Patents
Preparation method of high-quality large-specification 7085 aluminum alloy cast ingot Download PDFInfo
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- CN115679170B CN115679170B CN202211412653.1A CN202211412653A CN115679170B CN 115679170 B CN115679170 B CN 115679170B CN 202211412653 A CN202211412653 A CN 202211412653A CN 115679170 B CN115679170 B CN 115679170B
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- 238000005266 casting Methods 0.000 claims abstract description 127
- 238000007670 refining Methods 0.000 claims abstract description 124
- 238000000034 method Methods 0.000 claims abstract description 63
- 238000003723 Smelting Methods 0.000 claims abstract description 34
- 238000000137 annealing Methods 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 17
- 239000002893 slag Substances 0.000 claims abstract description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 106
- 229910052782 aluminium Inorganic materials 0.000 claims description 72
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 72
- 229910052786 argon Inorganic materials 0.000 claims description 53
- 239000007788 liquid Substances 0.000 claims description 51
- 239000000155 melt Substances 0.000 claims description 37
- 238000007872 degassing Methods 0.000 claims description 34
- 229910045601 alloy Inorganic materials 0.000 claims description 33
- 239000000956 alloy Substances 0.000 claims description 33
- 239000003795 chemical substances by application Substances 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 19
- 239000010949 copper Substances 0.000 claims description 14
- 239000011777 magnesium Substances 0.000 claims description 14
- 230000001105 regulatory effect Effects 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000011701 zinc Substances 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 12
- 239000011449 brick Substances 0.000 claims description 11
- 239000000919 ceramic Substances 0.000 claims description 11
- 229910052802 copper Inorganic materials 0.000 claims description 11
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 10
- ZGUQGPFMMTZGBQ-UHFFFAOYSA-N [Al].[Al].[Zr] Chemical compound [Al].[Al].[Zr] ZGUQGPFMMTZGBQ-UHFFFAOYSA-N 0.000 claims description 10
- 229910052749 magnesium Inorganic materials 0.000 claims description 10
- 229910052725 zinc Inorganic materials 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 5
- 238000010907 mechanical stirring Methods 0.000 claims description 4
- 238000007790 scraping Methods 0.000 claims description 4
- 239000011343 solid material Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
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- 238000004458 analytical method Methods 0.000 description 13
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 description 11
- 230000000694 effects Effects 0.000 description 11
- 238000005496 tempering Methods 0.000 description 9
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- 229910052739 hydrogen Inorganic materials 0.000 description 5
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Abstract
The invention provides a preparation method of a high-quality large-specification 7085 aluminum alloy cast ingot, which comprises the following steps: proportioning, smelting, primary refining, secondary refining, tertiary refining, preparation before casting, casting and homogenizing annealing to obtain the high-quality large-specification 7085 aluminum alloy cast ingot. The invention overcomes the defects or shortages of large crack tendency, coarse grains, serious component segregation, smaller ingot specification and the like in the existing 7085 aluminum alloy ingot production, and provides a preparation method of the high-quality large-specification 7085 aluminum alloy ingot, the 7085 aluminum alloy ingot with the diameter of 830mm can be obtained by the method, and the 7085 aluminum alloy ingot has the advantages of fine as-cast structure grains, no slag inclusion, no shrinkage cavity shrinkage porosity, grain size of less than or equal to 2 levels, component segregation rate of less than or equal to 6%, meets the national requirements on preparation of large-scale integral member materials, and fills the domestic blank.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy ingot casting preparation, and particularly relates to a preparation method of a high-quality large-specification 7085 aluminum alloy ingot.
Background
7085 Aluminum alloy is novel 7xxx aluminum alloy which has the advantages of high strength, high damage tolerance, high corrosion resistance and the like and is developed in 2002 by Alcoa company in the United states, is successfully applied to important bearing components such as spar members, landing gear and the like of Boeing 787 aircraft and air passenger A380 aircraft at present, and has a great application background in the aerospace field. However, 7085 aluminum alloy cast ingots have lower room temperature forming performance due to the fact that the total alloy element content exceeds 10%, the solidification interval is wide, the casting stress is large, the component segregation is serious, and the like.
As the size of the aerospace vehicle is larger, the required size of the cast ingot is larger, but the problems of large component segregation, difficult molding, low yield and the like of the large-size cast ingot are increasingly prominent. The preparation of the large-sized integral member of the aerospace-grade 7085 aluminum alloy is not separated from the preparation of high-quality large-sized cast ingots, and the 7085 aluminum alloy cast ingots produced by the prior art have the current situations of small size (the diameter is not more than 700 mm), difficult molding (the internal structure is thick, the composition segregation) and the like, so that the application of the large-sized integral member of the aerospace-grade 7085 aluminum alloy cast ingots in integral member material molding is limited.
Disclosure of Invention
In view of the above, the invention aims to provide a preparation method of a high-quality large-size 7085 aluminum alloy ingot, and the ingot product prepared by the method has large size, easy molding and good performance.
The invention provides a preparation method of a high-quality large-specification 7085 aluminum alloy cast ingot, which comprises the following steps:
Proportioning, smelting, primary refining, secondary refining, tertiary refining, preparation before casting, casting and homogenizing annealing to obtain the high-quality large-specification 7085 aluminum alloy cast ingot.
Preferably, the high-quality large-size 7085 aluminum alloy cast ingot comprises the following components:
0 to 0.06wt% Si;
0 to 0.08wt% of Fe;
1.3 to 2.0wt% of Cu;
0 to 0.04wt% Mn;
1.2 to 1.8wt% of Mg;
0 to 0.04wt% Cr;
7.0 to 8.0wt% of Zn;
0 to 0.06wt% Ti;
0.08 to 0.15wt% of Zr;
single impurity less than or equal to 0.05wt%;
The total impurity is less than or equal to 0.15wt%;
The balance being Al.
Preferably, the smelting method comprises:
Putting a dry moisture-free remelted aluminum ingot into a smelting furnace, starting electromagnetic stirring after the furnace charge is melted by about 40%, assisting mechanical stirring after the solid material is not seen on the surface of a molten pool, and scraping dross on the surface of the melt in time; when the surface is flattened, furnace burden is partially or completely melted and can completely submerge materials, adding copper plates, zinc ingots and aluminum-zirconium intermediate alloy, mechanically stirring when the temperature of aluminum liquid reaches 720-750 ℃, and uniformly scalding magnesium ingots into the aluminum liquid by using a forklift.
Preferably, the primary refining method comprises the following steps:
Using argon as a carrier, uniformly spraying a refining agent into the melt in the furnace, and simultaneously starting a furnace bottom air brick system of the smelting furnace to perform primary refining;
The purity of the argon is more than or equal to 99.996%; the pressure of the argon is 0.08-0.11 MPa; the consumption of the refining agent is 0.8-1.2 kg/ton of aluminum;
The temperature of the primary refining is 740-760 ℃ and the time is 15-30 min;
And carrying out slag skimming and standing after the primary refining, wherein the standing time is 20-40 min.
Preferably, the pre-casting preparation includes:
preheating a casting plate and a launder, on-line wire feeding, on-line degassing, two-stage filtering and casting temperature regulation.
Preferably, the online wire feeding is realized by arranging a double-path wire feeding mode through an online wire feeding machine, and the grain refiner is an Al5Ti1B alloy wire; the total speed of the on-line wire feeding is 900-1200 mm/min.
Preferably, the online degassing adopts a vacuum argon blowing two-stage graphite rotor Hycast degassing box; the argon flow of the degassing box is 70-75L/min; the argon pressure of the degassing box is 7.0-7.5 barg; the rotating speed of the rotor of the degassing box is 650-700 rpm.
Preferably, the two-stage filtration adopts a two-stage filtration box, and the two-stage filtration box is provided with a ceramic filter plate; the ceramic filter plate is 30-60 ppi.
Preferably, the casting speed is 12-18 mm/min; the water flow is 36-48 m 3/h; the temperature of the casting disk tail is 690-710 ℃.
Preferably, the homogenizing annealing method comprises the following steps:
heating to a first temperature and preserving heat for a first time, then heating to a second temperature and preserving heat for a second time, discharging, and naturally cooling to room temperature;
the first temperature is 400-410 ℃; the first time is 14-15 hours;
the second temperature is 470-475 ℃; the second time is 53-55 h.
The 7085 aluminum alloy cast ingot produced by the prior art has the defects of smaller specification and size, general cast ingot diameter not exceeding 700mm, large cast ingot crack tendency, serious component segregation, thick internal structure and the like, cannot realize industrial production, and is difficult to meet the requirements of large-scale integral component manufacturing materials in the national aerospace industry field.
The invention overcomes the defects or shortages of large crack tendency, coarse grains, serious component segregation, smaller ingot specification and the like in the existing 7085 aluminum alloy ingot production, and provides a preparation method of the high-quality large-specification 7085 aluminum alloy ingot, the 7085 aluminum alloy ingot with the diameter of 830mm can be obtained by the method, and the 7085 aluminum alloy ingot has fine as-cast structure grains, no slag inclusion, no shrinkage cavity shrinkage porosity, grain size of less than or equal to 2 levels and component segregation rate of less than or equal to 6 percent, so that industrial production of factories can be realized, the national demand for preparation of large-scale integral component materials is met, and the domestic blank is filled.
Drawings
FIG. 1 is a casting site diagram of an aluminum alloy ingot prepared in example 1 of the present invention;
FIG. 2 is a physical diagram of an aluminum alloy ingot prepared in example 1 of the present invention;
FIG. 3 is a microstructure morphology diagram of the center of an aluminum alloy ingot prepared in example 2 of the present invention;
FIG. 4 is a microstructure morphology diagram of a 1/2 radius position of an aluminum alloy ingot prepared in example 2 of the present invention;
FIG. 5 is a microstructure profile of the edge portion of an aluminum alloy ingot prepared in example 2 of the present invention.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a preparation method of a high-quality large-specification 7085 aluminum alloy cast ingot, which comprises the following steps:
Proportioning, smelting, primary refining, secondary refining, tertiary refining, preparation before casting, casting and homogenizing annealing to obtain the high-quality large-specification 7085 aluminum alloy cast ingot.
In the present invention, the method of compounding preferably comprises:
and calculating the input amount of the raw materials and the auxiliary materials according to the input amount and the alloy component content, wherein remelting aluminum ingots with Al content more than or equal to 99.90% and more are used, cu, mg and Zn are pure copper plates, magnesium ingots and zinc ingots with purity more than or equal to 99.90% and more, and Ti is mixed with aluminum-titanium intermediate alloy and Zr is mixed with aluminum-zirconium intermediate alloy.
In the present invention, the smelting process preferably comprises:
Putting a dry moisture-free remelted aluminum ingot into a smelting furnace, starting electromagnetic stirring after the furnace charge is melted by about 40%, assisting mechanical stirring after the solid material is not seen on the surface of a molten pool, and scraping dross on the surface of the melt in time; when the surface is flattened, furnace burden is partially or completely melted and can completely submerge materials, adding copper plates, zinc ingots and aluminum-zirconium intermediate alloy, mechanically stirring when the temperature of aluminum liquid reaches above 720 ℃, and uniformly scalding magnesium ingots into the aluminum liquid by using a forklift.
In the present invention, the time of the electromagnetic stirring is preferably 20 to 40min, more preferably 25 to 35min, and most preferably 30min; the time of the mechanical stirring is preferably 3 to 8 minutes, more preferably 4 to 7 minutes, and most preferably 5 to 6 minutes.
In the present invention, the aluminum liquid temperature is preferably 720 to 750 ℃, more preferably 730 to 740 ℃, and most preferably 735 ℃.
In the invention, the preferable melt temperature in the smelting process reaches 740-760 ℃, two component samples are taken before the furnace for spectral component analysis, and the components are adjusted to be qualified according to the analysis result.
In the present invention, the temperature of the primary refining is preferably 740 to 760 ℃, more preferably 745 to 755 ℃, and most preferably 750 ℃. In the present invention, the primary refining method preferably comprises:
Argon is used as a carrier, a refining agent is uniformly sprayed into the melt in the furnace, and meanwhile, a gas brick system of the smelting furnace is started for refining.
In the invention, the purity of the argon is preferably more than or equal to 99.996%; the pressure of the argon gas is preferably 0.08-0.11 MPa, more preferably 0.09-0.10 MPa; the amount of the refining agent is preferably 0.8 to 1.2 kg/ton of aluminum, more preferably 1.0 kg/ton of aluminum; the time for the primary refining is preferably 15 to 30 minutes, more preferably 20 to 25 minutes.
In the invention, the surface scum is preferably scraped and stood after the primary refining; the time for the standing is preferably 20 to 40 minutes, more preferably 25 to 35 minutes, and most preferably 30 minutes.
In the invention, the secondary refining method is consistent with the primary refining method, and is not repeated here; the secondary refining is preferably followed by skimming and standing, and the standing time is preferably 20 to 40 minutes, more preferably 25 to 35 minutes, and most preferably 30 minutes.
In the invention, the melt with qualified components is preferably transferred from a smelting furnace to a heat-preserving standing furnace after secondary refining, the heat-preserving furnace is started to be electromagnetically stirred in the furnace pouring process, aluminum-titanium intermediate alloy is added along with a launder in the furnace pouring process, the addition is calculated according to 0.02wt.%, the grain refining effect is achieved, and after the furnace pouring is finished, the sample is taken for component analysis, and the components are finely adjusted; and after the furnace is reversed, refining for the third time is carried out.
In the present invention, the method of tertiary refining preferably includes:
And uniformly spraying a refining agent into the melt in the furnace by using argon as a carrier to refine.
In the invention, the purity of the argon is preferably more than or equal to 99.996%; the pressure of the argon gas is preferably 0.08-0.11 MPa, more preferably 0.09-0.10 MPa; the amount of the refining agent added is preferably 0.4 to 0.6 kg/ton of aluminum, more preferably 0.5 kg/ton of aluminum; the time for the third refining is preferably 15 to 30 minutes, more preferably 20 to 25 minutes.
In the invention, the three refining steps are preferably followed by slag skimming and standing, and the temperature of the melt is regulated to the casting starting temperature for casting; the time for the standing is preferably 20 to 40min, more preferably 25 to 35min, and most preferably 30min; the casting temperature is preferably 755 to 765 ℃, more preferably 758 to 762 ℃, and most preferably 760 ℃.
In the present invention, the pre-casting preparation preferably includes:
preheating a casting plate and a launder, feeding wires on line, degassing and filtering on line, and regulating and controlling the casting temperature.
In the invention, the cleaned casting plate and launder are baked and preheated in place for at least 1h.
In the invention, the online wire feeding is preferably realized by arranging a double-path wire feeding mode through an online wire feeding machine, and the grain refiner is an Al5Ti1B alloy wire; the total rate of on-line wire feeding is preferably 900-1200 mm/min, more preferably 1000-1100 mm/min, and most preferably 1050mm/min.
In the invention, the online degassing preferably adopts a vacuum argon blowing two-stage graphite rotor Hycast degassing box; the argon flow of the degassing box is preferably 70-75L/min, more preferably 71-74L/min, and most preferably 72-73L/min; the argon pressure of the degassing tank is preferably 7.0 to 7.5barg, more preferably 7.1 to 7.4barg, most preferably 7.2 to 7.3barg; the rotor speed of the deaeration tank is preferably 650 to 700rpm, more preferably 660 to 690rpm, and most preferably 670 to 680rpm.
In the invention, the filtering is preferably performed by a two-stage filter box, and the two-stage filter box is preferably provided with a ceramic filter plate; the ceramic filter plate is preferably 30 to 60ppi.
In the present invention, the regulated casting temperature is preferably filled with the bulk molten aluminum before casting and regulated at 730 to 750 ℃, more preferably at 730 to 740 ℃.
In the present invention, the casting method preferably includes:
firstly, laying a bottom, then, inoculating the body molten aluminum, and starting an online wire feeder.
In the present invention, the method of laying a floor preferably includes:
The ladle filled with the pure aluminum liquid is used for transferring the pure aluminum liquid into a launder after a filter box, and flows through a casting plate to start bottom casting in a crystallizer.
In the present invention, the weight of the pure aluminum liquid is preferably 0.8 to 1.0t, more preferably 0.9t; the temperature of the pure aluminum liquid is preferably 760 to 770 ℃, more preferably 762 to 768 ℃, and most preferably 764 to 766 ℃.
In the present invention, the casting speed is preferably 12 to 18mm/min, more preferably 14 to 16mm/min, and most preferably 15mm/min; the water flow rate is preferably 36-48 m 3/h, more preferably 40-45 m 3/h, most preferably 42-43 m 3/h; the temperature of the cast disc tail is preferably 690-710 ℃, more preferably 695-705 ℃, and most preferably 700 ℃.
In the present invention, a wiper is preferably used in the casting process, and the pressure setting is preferably 0.06 to 0.10MPa, more preferably 0.07 to 0.09MPa, and most preferably 0.08MPa; ensuring the surface of the ingot to be scraped cleanly, preferably opening a degassing box when the casting length is about 200mm, and opening an ultrasonic auxiliary device above the crystallizer after casting enters a steady state; when the casting ends, a tempering process is preferably adopted, and when the aluminum liquid is solidified to the position with the radius of 2/3, water is stopped firstly and then the casting is stopped, and the drying of the pouring gate is ensured to be free of moisture.
In the invention, the cast ingot is preferably transported to a soaking furnace for homogenizing annealing immediately after casting is finished, and the transportation time is preferably not more than 30min. In the present invention, the method of homogenizing annealing preferably includes:
Heating to a first temperature and preserving heat for a first time, heating to a second temperature and preserving heat for a second time, discharging, and naturally cooling to room temperature.
In the present invention, the first temperature is preferably 400 to 410 ℃, more preferably 402 to 408 ℃, and most preferably 404 to 406 ℃; the first time is preferably 14-15 h, more preferably 14.5h; the second temperature is preferably 470-475 ℃, more preferably 471-474 ℃, and most preferably 472-473 ℃; the second time is preferably 53 to 55 hours, more preferably 54 hours.
In the invention, the casting is finished and preferably comprises a sawing ingot dummy ingot head end and a sprue end; the head end of the sawing dummy bar is 400-600 mm, more preferably 450-550 mm, and most preferably 500mm; the sawing gate end is 300-400 mm, more preferably 320-380 mm, and most preferably 340-360 mm.
In the invention, the preparation method of the high-quality large-specification 7085 aluminum alloy cast ingot preferably comprises the following steps:
Step one: and calculating the input amount of the raw materials and the auxiliary materials according to the input amount and the alloy component content, wherein remelting aluminum ingots with Al content more than or equal to 99.90% and more are used, cu, mg and Zn are pure copper plates, magnesium ingots and zinc ingots with purity more than or equal to 99.90% and more, and Ti is mixed with aluminum-titanium intermediate alloy and Zr is mixed with aluminum-zirconium intermediate alloy.
Step two: putting a dry moisture-free remelted aluminum ingot into a smelting furnace, starting electromagnetic stirring for 30min after the furnace burden is melted by about 40%, mechanically stirring for 3-8 min after no solid material is seen on the surface of a molten pool, and timely scraping scum on the surface of the melt; when the surface is flattened, furnace burden is partially or completely melted and can completely submerge materials, adding copper plates, zinc ingots and aluminum-zirconium intermediate alloy, mechanically stirring for 3-8 min when the temperature of aluminum liquid reaches above 720 ℃, and uniformly scalding magnesium ingots into the aluminum liquid by using a forklift.
Step three: when the temperature reaches 740-760 ℃, the smelting furnace performs primary refining, argon with purity more than or equal to 99.996% is used as a carrier, the pressure is set to 0.08-0.11 MPa, the granular refining agent with the dosage of 0.8-1.2 kg/ton of aluminum is uniformly sprayed into the melt in the furnace, and meanwhile, a ventilation brick system of the smelting furnace is started, and the refining time is 15-30 min; taking off the surface scum after the first refining, standing for 30min, then carrying out the second refining by a smelting furnace, and carrying out the slag skimming and standing for 30min after the refining process and method are the same as those of the first refining.
Step four: transferring the melt with qualified components from a smelting furnace to a heat-preserving standing furnace, and adding aluminum-titanium intermediate alloy along with a launder in the converter process; and (3) carrying out third refining after the converter is finished, using argon with the purity of more than or equal to 99.996% as a carrier, setting the pressure to be 0.08-0.11 MPa, uniformly spraying a granular refining agent with the dosage of 0.4-0.6 kg/ton of aluminum into a melt in the converter, carrying out slag skimming and standing for 30min after the refining is finished, and regulating the temperature of the melt to the casting starting temperature of 755-765 ℃ for casting.
Step five: the method comprises the steps of preparing work before casting, baking and preheating cleaned casting plates and launders in place in advance, setting a double-way wire feeding mode for at least 1h on an online wire feeder, setting a grain refiner to be Al5Ti1B alloy wires, feeding the wires at a total wire feeding speed of 900-1200 mm/min, setting argon flow of 70-75L/min in a degassing box, setting argon pressure of 7.0-7.5 barg, setting a rotor rotating speed of 650-700 rpm, setting a double-stage filter box to be provided with a ceramic filter plate with a porosity of 40ppi+60ppi, filling with body aluminum liquid before casting, and regulating and controlling the temperature to be 730-740 ℃.
Step six: transferring the aluminum liquid into a launder after a filter box by using a ladle filled with about 0.8-1.0 t pure aluminum liquid (the temperature of the aluminum liquid is 760-770 ℃), and pouring the aluminum liquid into a casting tray to start bottom casting in a crystallizer with the diameter of 830mm, immediately accessing 7085 body aluminum liquid after bottom casting is finished, starting an online wire feeder, wherein the casting speed is 12-18 mm/min, the water flow is 36-48 m 3/h, and the tray tail temperature is 690-710 ℃; and in the casting process, a wiper is used, the pressure is set to be 0.06-0.10 MPa, the surface of an ingot is ensured to be completely scraped, a degassing box is opened when the casting length is about 200mm, and an ultrasonic auxiliary device is opened above the crystallizer after the casting is in a steady state. When the casting is finished, a tempering process is adopted, and when the aluminum liquid is solidified to the position with the radius of 2/3, the machine is stopped firstly and then water is stopped, and the drying of the pouring gate is ensured to be free of water.
Step seven: transferring the cast ingot to a soaking pit for homogenizing annealing immediately after casting, wherein the transferring time is not longer than 30min, and homogenizing annealing process: firstly heating the cast ingot to 400-410 ℃ and preserving heat for 14-15 h, then heating the cast ingot to 470-475 ℃ and preserving heat for 53-55 h, discharging, naturally cooling to room temperature, sawing the head end 400-600 mm of the cast ingot dummy ingot and the gate end 300-400 mm.
In the invention, in the third step, after refining in the smelting furnace, the residence time of the melt in the furnace is preferably not more than 3 hours, otherwise argon is supplemented for refining for 15-30 minutes, and the components are readjusted by sampling analysis, wherein the pressure of the air brick of the smelting furnace is preferably 350-900 KPa, more preferably 400-800 KPa, more preferably 500-700 KPa, and most preferably 600KPa; the blowing carrier is argon, and the flow of the argon is preferably 55-70L/min so as to reduce the hydrogen absorption tendency of the melt staying at high temperature for a long time.
In the invention, in the fourth step, after refining in the heat-preserving standing furnace, casting is preferably performed within 2 hours, otherwise argon is supplemented for refining for 15-30 minutes, and surface scum is preferably scraped off 10 minutes before casting, so that the hydrogen absorption tendency of the melt staying at high temperature for a long time is reduced.
In the fifth step, the filtering box is preferably filled with the body aluminum liquid in advance before casting, and the temperature is regulated and controlled to 730-740 ℃ to ensure the casting temperature of the casting plate; the online wire feeder is a double-way wire feeding device, and the grain refiner uses Al-5Ti-1B alloy wires; the online degassing device uses a vacuum argon blowing double-stage rotor degassing box, wherein the argon flow is 70-75L/min, the argon pressure is 7.0-7.5 barg, and the rotor rotating speed is 650-700 rpm; the filter unit used a two stage filter box and the ceramic filter plate used 40ppi+60ppi.
In the present invention, in the sixth step, bottom casting is preferably performed using a pure aluminum liquid to prevent cracks from occurring in the bottom of the casting; preferably, the degassing box is opened at the casting length of about 200mm, and the casting temperature is regulated to reach the optimal state; the wiper is preferably used in the casting process, and tempering technology is adopted in the casting ending process so as to avoid cracks of the cast ingot; after casting enters a steady state, an ultrasonic auxiliary device is preferably started above the crystallizer, so that the effects of refining grains and reducing component segregation are achieved.
In the seventh step, the ingot homogenizing annealing process is preferably to heat the ingot to 400-410 ℃ and keep the temperature for 14-15 h, then heat the ingot to 470-475 ℃ and keep the temperature for 53-55 h, and naturally cool the ingot to room temperature after discharging, so as to eliminate the internal stress and segregation of the ingot to the greatest extent.
In the invention, the components of the high-quality large-size 7085 aluminum alloy cast ingot are preferably as follows:
0 to 0.06wt% Si;
0 to 0.08wt% of Fe;
1.3 to 2.0wt% of Cu;
0 to 0.04wt% Mn;
1.2 to 1.8wt% of Mg;
0 to 0.04wt% Cr;
7.0 to 8.0wt% of Zn;
0 to 0.06wt% Ti;
0.08 to 0.15wt% of Zr;
single impurity less than or equal to 0.05wt%;
The total impurity is less than or equal to 0.15wt%;
The balance being Al.
In the present invention, the mass content of Si is preferably not more than 0.05%, more preferably not more than 0.03%; the mass content of Fe is preferably not more than 0.08%, more preferably not more than 0.07%; the mass content of Cu is preferably 1.4 to 1.9%, more preferably 1.4 to 1.8%, more preferably 1.4 to 1.6%, and most preferably 1.5%; the mass content of Mn is preferably not more than 0.03%, more preferably not more than 0.02%; the mass content of Mg is preferably 1.4 to 1.8%, more preferably 1.5 to 1.8%, and most preferably 1.7%; the mass content of Cr is preferably not more than 0.03%, more preferably not more than 0.02%; the mass content of Zn is preferably 7.2-7.8%, more preferably 7.3-7.8%, and most preferably 7.5%; the mass content of Ti is preferably not more than 0.04%, more preferably 0.02 to 0.04%, most preferably 0.03%; the mass content of Zr is preferably 0.09 to 0.14%, more preferably 0.10 to 0.14%, and most preferably 0.12%.
The diameter of the cast ingot cast by the method provided by the invention reaches 830mm, exceeds the standard of 700mm of the diameter of a common 7085 aluminum alloy cast ingot, and meets the national requirements for large-size 7085 aluminum alloy cast ingots.
The melt is subjected to multistage degassing, deslagging and purification, the online hydrogen content of a casting launder is less than or equal to 0.08mL/100g Al, the purification degree of the melt is greatly improved, crystal grains are refined by applying an ultrasonic auxiliary technology, the component segregation of an ingot is reduced, and finally, the internal stress and full segregation of the ingot are eliminated by the homogenization process; and finally, the crystal grains of the cast ingot are fine and uniform, the grain size is not more than two stages, slag inclusion and shrinkage cavity shrinkage porosity are avoided, the component segregation rate is less than or equal to 6%, and the national requirement on the preparation of large-scale integral component materials is met.
Example 1
The high-quality large-size 7085 aluminum alloy cast ingot is prepared according to the following method:
Sequentially comprises the steps of batching, smelting, refining, preparing and casting before casting and homogenizing annealing.
And (3) batching:
The refined aluminum ingot with the Al content purity of 99.90 percent and above is used, the main alloying elements Cu, mg and Zn are pure metals with the purity of more than or equal to 99.90 percent, ti and Zr are aluminum-titanium intermediate alloy and aluminum-zirconium intermediate alloy, other elements are not added, and the ingredients are controlled as follows:
Smelting:
firstly, loading an aluminum ingot into a smelting furnace, igniting and heating, after the furnace burden is melted by about 40%, starting electromagnetic stirring for 30min, when the surface of a molten pool is flattened and the furnace burden is partially melted but can completely submerge the materials, adding a copper plate, a zinc ingot and an aluminum-zirconium intermediate alloy, and mechanically stirring for 5min; continuously heating to 740-750 ℃ of aluminum liquid, adding magnesium ingots, and uniformly scalding the magnesium ingots into the aluminum liquid; all materials (except for the aluminum-titanium intermediate alloy) are added into the furnace, the temperature of the melt reaches 740-750 ℃, two component samples are taken in front of the furnace for spectral component analysis, and the components are adjusted to be qualified according to the analysis result.
Refining:
Refining in a smelting furnace: the refining times are two times, the refining temperature is 740-750 ℃, the use amount of granular refining agent is 0.8kg/t Al each time, the refining time is 20+/-2 min, the refining agent is uniformly blown into the melt through a refiner by taking argon with the purity of more than or equal to 99.996% as a carrier, the argon pressure is 0.08MPa, a furnace bottom air brick system is simultaneously started in the refining process, the refining effect is enhanced, scum on the surface of the melt is scraped after the refining is finished each time, the refining is kept stand for 30-35 min, the temperature of the melt is regulated to 755-760 ℃, the electromagnetic stirring of an insulating furnace is started in the furnace pouring process, aluminum-titanium intermediate alloy is added into a furnace pouring launder, the addition amount is calculated according to 0.02wt.%, the refining effect of grains is achieved, the samples are taken for component analysis after the furnace pouring is finished, and the components are finely adjusted.
Refining in a heat preservation furnace: the refining times are one time, the refining temperature is 740-750 ℃, granular refining agent is used, the dosage is 0.4kg/t Al, argon with the purity more than or equal to 99.996% is used as a carrier, the refining agent is uniformly blown into a melt through a refiner, the refining time is 20+/-2 min, the argon pressure is 0.08MPa, and a furnace bottom air brick system is simultaneously started in the refining process, so that the refining effect is enhanced; and after refining, skimming and standing for 30-35 min, and adjusting the casting temperature to 755-760 ℃ to prepare casting.
Preparation before casting:
Baking and preheating the cleaned casting plate, launder and tools in place in advance for at least 1h; the two-stage filter box is provided with a ceramic filter plate with the porosity of 30ppi+50ppi, and the filter box is filled with 7085 aluminum alloy body aluminum liquid in advance before casting, and the temperature of the aluminum liquid of the filter box is regulated and controlled to be 740-750 ℃; the online degassing uses Hycast degassing box, argon flow is 70L/min, argon pressure is 7.5barg, rotor rotating speed is 700rpm, the online wire feeder is provided with a double-way wire feeding mode, and the grain refiner is Al5Ti1B alloy wire, and total wire feeding speed is 1100mm/min.
Casting:
Firstly, using pure aluminum liquid (the temperature of the aluminum liquid is 760-770 ℃) to pave the bottom, preventing the bottom from generating cracks, opening a flashboard at an outlet of a filter box to access the aluminum liquid of the body immediately after the end of the bottom paving, simultaneously starting an online wire feeder, and starting a degassing box with the casting length of about 200 mm; the casting speed is 12mm/min, the casting water flow is 30m 3/h, the casting speed is adjusted to 18mm/min after entering a steady state, the water flow is adjusted to 42m 3/h, the temperature of the casting disk tail is controlled to 690-710 ℃, and an ultrasonic auxiliary device is started above the crystallizer; a wiper is used in the casting process, the pressure is set to be 0.08MPa, and the surface of an ingot is ensured to be cleanly scraped; and after casting is finished, a tempering process is adopted, namely the casting machine stops moving downwards, cooling water is stopped after the aluminum liquid in the crystallizer is solidified to the position with the radius of 2/3, and the drying of the pouring gate is ensured to be free of moisture.
Homogenizing:
immediately transferring the cast ingot to a soaking pit for homogenizing annealing after tempering of the cast ingot is finished, wherein the transferring time is not longer than 30min; homogenizing annealing process: firstly heating the cast ingot to 405 ℃ and preserving heat for 15 hours, and then heating the cast ingot to 475 ℃ and preserving heat for 55 hours; naturally cooling to room temperature after discharging, sawing and cutting the ingot dummy ingot head end by 600mm and the pouring gate end by 400mm;
The casting site of the aluminum alloy cast ingot prepared in the embodiment 1 of the invention is shown in fig. 1, and the prepared cast ingot is shown in fig. 2 and is a 7085 aluminum alloy diameter phi 830 specification round cast ingot.
Example 2
The high-quality large-specification 7085 aluminum alloy cast ingot is prepared according to the following method:
sequentially comprises the steps of batching, smelting, refining, preparation before casting, casting and homogenizing annealing.
The compounding method was the same as in example 1, except that the compounding ingredients were as follows:
Smelting:
Firstly, charging an aluminum ingot into a smelting furnace, igniting and heating, after the furnace burden is melted by about 50%, starting electromagnetic stirring for 35min, when the surface of a molten pool is flattened and the furnace burden is completely melted, adding a copper plate, a zinc ingot and an aluminum-zirconium intermediate alloy, and mechanically stirring for 8min; continuously heating to 740-750 ℃ of aluminum liquid, adding magnesium ingots, and uniformly scalding into the aluminum liquid. All materials (except for the aluminum-titanium intermediate alloy) are added into the furnace, the temperature of the melt reaches 750-760 ℃, two component samples are taken in front of the furnace for spectral component analysis, and the components are adjusted to be qualified according to the analysis result.
Refining:
Refining in a smelting furnace: the refining times are two times, the refining temperature is 750-760 ℃, 1.2kg/t Al is used for each time, the refining time is 20+/-2 min, the refining agent is uniformly blown into a melt through a refiner by taking argon with the purity of more than or equal to 99.996% as a carrier, the argon pressure is 0.11MPa, a furnace bottom air brick system is simultaneously started in the refining process, the refining effect is enhanced, scum on the surface of the melt is scraped and kept stand for 30-35 min after each refining is finished, the temperature of the melt in a furnace pouring is adjusted to 760-765 ℃, the electromagnetic stirring of an insulating furnace is started in the furnace pouring process, aluminum-titanium intermediate alloy is added into a furnace pouring launder, the addition is calculated according to 0.02wt.%, the grain refining effect is achieved, and after the furnace pouring is finished, sampling is carried out, the component analysis and the component is finely adjusted.
Refining in a heat preservation furnace: the refining times are one time, the refining temperature is 750-760 ℃, granular refining agent is used, the dosage is 0.6kg/t Al, argon with the purity more than or equal to 99.996% is used as a carrier, the refining agent is uniformly blown into a melt through a refiner, the refining time is 20+/-2 min, the argon pressure is 0.11MPa, and a furnace bottom air brick system is simultaneously started in the refining process to strengthen the refining effect; and after refining, skimming and standing for 30-35 min, and adjusting the casting temperature to 760-765 ℃ to prepare casting.
Preparation before casting:
Baking and preheating the cleaned casting plate, launder and tools in place in advance for at least 1h; the bipolar filter box is provided with a ceramic filter plate with porosity of 40ppi+60ppi, and the filter box is filled with 7085 aluminum alloy body aluminum liquid in advance before casting, and the temperature of the aluminum liquid in the filter box is regulated and controlled to be 730-740 ℃; the online degassing uses Hycast degassing box, argon flow is 70L/min, argon pressure is 7.5barg, rotor rotating speed is 650rpm, the online wire feeder is provided with a double-way wire feeding mode, and the grain refiner is Al5Ti1B alloy wire, and total wire feeding speed is 1200mm/min.
Casting:
Firstly, using pure aluminum liquid (the temperature of the aluminum liquid is 760-770 ℃) to pave the bottom, preventing the bottom from generating cracks, opening a flashboard at an outlet of a filter box to access the aluminum liquid of the body immediately after the end of the bottom paving, simultaneously starting an online wire feeder, and starting a degassing box with the casting length of about 200 mm; the casting speed is 12mm/min, the casting water flow is 36m 3/h, the casting speed is adjusted to 18mm/min after the casting is in a steady state, the water flow is adjusted to 48m 3/h, the temperature of the tail of the casting disc is controlled between 690 and 710 ℃, and an ultrasonic auxiliary device is started above the crystallizer; a wiper is used in the casting process, the pressure is set to be 0.08MPa, and the surface of an ingot is ensured to be cleanly scraped; and after casting is finished, a tempering process is adopted, namely the casting machine stops moving downwards, cooling water is stopped after the aluminum liquid in the crystallizer is solidified to the position with the radius of 2/3, and the drying of the pouring gate is ensured to be free of moisture.
Homogenizing:
Immediately transferring the cast ingot to a soaking pit for homogenizing annealing after tempering of the cast ingot is finished, wherein the transferring time is not longer than 30min; homogenizing annealing process: firstly heating the cast ingot to 410 ℃ and preserving heat for 14 hours, and then heating the cast ingot to 470 ℃ and preserving heat for 54 hours; naturally cooling to room temperature after discharging, sawing and cutting the ingot dummy ingot head end by 600mm and the pouring gate end by 400mm.
Example 3
The high-quality large-specification 7085 aluminum alloy cast ingot is prepared according to the following method:
sequentially comprises the steps of batching, smelting, refining, preparation before casting, casting and homogenizing annealing.
And (3) batching: the ingredients were prepared as in example 1, with the difference from example 1 that the ingredients of the ingredients were as follows:
Smelting:
Firstly, charging an aluminum ingot into a smelting furnace, igniting and heating, after the furnace burden is melted by about 50%, starting electromagnetic stirring for 40min, when the surface of a molten pool is flattened and the furnace burden is completely melted, adding a copper plate, a zinc ingot and an aluminum-zirconium intermediate alloy, and mechanically stirring for 8min; continuously heating to 740-750 ℃ of aluminum liquid, adding magnesium ingots, and uniformly scalding into the aluminum liquid. All materials (except for the aluminum-titanium intermediate alloy) are added into the furnace, the temperature of the melt reaches 750-760 ℃, two component samples are taken in front of the furnace for spectral component analysis, and the components are adjusted to be qualified according to the analysis result.
Refining:
Refining in a smelting furnace: the refining times are two times, the refining temperature is 750-760 ℃, 1.1kg/t Al is used for each time, the refining time is 20+/-2 min, the refining agent is uniformly blown into a melt through a refiner by taking argon with the purity of more than or equal to 99.996% as a carrier, the argon pressure is 0.10MPa, a furnace bottom air brick system is simultaneously started in the refining process, the refining effect is enhanced, scum on the surface of the melt is scraped and kept stand for 30-35 min after each refining is finished, the temperature of the melt in a furnace pouring is adjusted to 760-765 ℃, the electromagnetic stirring of an insulating furnace is started in the furnace pouring process, aluminum-titanium intermediate alloy is added into a furnace pouring launder, the addition is calculated according to 0.02wt.%, the grain refining effect is achieved, and after the furnace pouring is finished, sampling is carried out, the component analysis and the component is finely adjusted.
Refining in a heat preservation furnace: the refining times are one time, the refining temperature is 750-760 ℃, argon with the purity more than or equal to 99.996% is blown into the melt, the refining time is 20+/-2 min, the argon pressure is 0.11MPa, and a furnace bottom air brick system is simultaneously started in the refining process to strengthen the refining effect; and after refining, skimming and standing for 30-35 min, and adjusting the casting temperature to 760-765 ℃ to prepare casting.
Preparation before casting:
Baking and preheating the cleaned casting plate, launder and tools in place in advance for at least 1h; the bipolar filter box is provided with a ceramic filter plate with porosity of 40ppi+60ppi, and the filter box is filled with 7085 aluminum alloy body aluminum liquid in advance before casting, and the temperature of the aluminum liquid in the filter box is regulated and controlled to be 730-740 ℃; the online degassing uses Hycast degassing box, argon flow is 75L/min, argon pressure is 7.5barg, rotor rotating speed is 700rpm, the online wire feeder is provided with a double-way wire feeding mode, and the grain refiner is Al5Ti1B alloy wire, and total wire feeding speed is 1050mm/min.
Casting:
Firstly, using pure aluminum liquid (the temperature of the aluminum liquid is 760-770 ℃) to pave the bottom, preventing the bottom from generating cracks, opening a flashboard at an outlet of a filter box to access the aluminum liquid of the body immediately after the end of the bottom paving, simultaneously starting an online wire feeder, and starting a degassing box with the casting length of about 200 mm; the casting speed is 12mm/min, the casting water flow is 36m 3/h, the casting speed is adjusted to 18mm/min after the casting is in a steady state, the water flow is adjusted to 48m 3/h, the temperature of the tail of the casting disc is controlled between 690 and 710 ℃, and an ultrasonic auxiliary device is started above the crystallizer; a wiper is used in the casting process, the pressure is set to be 0.08MPa, and the surface of an ingot is ensured to be cleanly scraped; and after casting is finished, a tempering process is adopted, namely the casting machine stops moving downwards, cooling water is stopped after the aluminum liquid in the crystallizer is solidified to the position with the radius of 2/3, and the drying of the pouring gate is ensured to be free of moisture.
Homogenizing:
Immediately transferring the cast ingot to a soaking pit for homogenizing annealing after tempering of the cast ingot is finished, wherein the transferring time is not longer than 30min; homogenizing annealing process: firstly heating the cast ingot to 410 ℃ and preserving heat for 15 hours, and then heating the cast ingot to 475 ℃ and preserving heat for 55 hours; naturally cooling to room temperature after discharging, sawing and cutting the ingot dummy ingot head end by 600mm and the pouring gate end by 400mm.
Performance detection
The large-size aluminum alloy ingots prepared in the embodiments 1 to 3 of the invention are detected, and the detection method and the detection result are as follows:
table 1 the components (balance Al) of the aluminum alloy ingots prepared in examples 1 to 3
TABLE 2 Hydrogen content and segregation Rate of principal alloy element components of aluminum alloy ingots prepared in examples 1 to 3
TABLE 3 detection results of macrostructure of aluminum alloy ingots prepared in examples 1 to 3
The center position, 1/2 radius position and edge position of the ingot prepared in example 2 were examined for microstructure, and the following results were obtained:
TABLE 4 microstructure at the center, 1/2 radius, and sides of the ingot prepared in example 2
The melt is subjected to multistage degassing, deslagging and purification, the online hydrogen content of a casting launder is less than or equal to 0.08mL/100g Al, the purification degree of the melt is greatly improved, grains are refined by applying an ultrasonic auxiliary technology, the component segregation of an ingot is reduced, and finally the internal stress and the component segregation of the ingot are eliminated by the homogenization process; and finally, the crystal grains of the cast ingot are fine and uniform, the grain size is not more than two stages, slag inclusion and shrinkage cavity shrinkage porosity are avoided, the component segregation rate is less than or equal to 6%, and the national requirement on the preparation of large-scale integral component materials is met.
While the application has been described and illustrated with reference to specific embodiments thereof, the description and illustration is not intended to limit the application. It will be apparent to those skilled in the art that various changes may be made in this particular situation, material, composition of matter, substance, method or process without departing from the true spirit and scope of the application as defined by the following claims, so as to adapt the objective, spirit and scope of the application. All such modifications are intended to be within the scope of this appended claims. Although the methods disclosed herein have been described with reference to particular operations being performed in a particular order, it should be understood that these operations may be combined, sub-divided, or reordered to form an equivalent method without departing from the teachings of the present disclosure. Thus, unless specifically indicated herein, the order and grouping of operations is not a limitation of the present application.
Claims (4)
1. A preparation method of a high-quality large-size 7085 aluminum alloy cast ingot comprises the following steps:
proportioning, smelting, primary refining, secondary refining, tertiary refining, preparation before casting, casting and homogenizing annealing to obtain a high-quality large-specification 7085 aluminum alloy cast ingot; the diameter of the high-quality large-specification 7085 aluminum alloy cast ingot is 830mm;
the smelting method comprises the following steps:
Putting a dry moisture-free remelted aluminum ingot into a smelting furnace, starting electromagnetic stirring after the furnace charge is melted by 40%, assisting mechanical stirring after no solid material is seen on the surface of a molten pool, and scraping dross on the surface of the melt in time; when the surface is flattened, furnace burden is partially or completely melted and can completely submerge materials, adding copper plates, zinc ingots and aluminum-zirconium intermediate alloy, mechanically stirring when the temperature of aluminum liquid reaches 720-750 ℃, and uniformly scalding magnesium ingots into the aluminum liquid by using a forklift;
the primary refining method comprises the following steps:
Using argon as a carrier, uniformly spraying a refining agent into the melt in the furnace, and simultaneously starting a furnace bottom air brick system of the smelting furnace to perform primary refining; the purity of the argon is more than or equal to 99.996%; the pressure of the argon is 0.08-0.11 MPa; the consumption of the refining agent is 0.8-1.2 kg/ton of aluminum; the temperature of the primary refining is 740-760 ℃;
the secondary refining method is consistent with the primary refining method;
The method for three refining comprises the following steps:
Using argon as a carrier, uniformly spraying a refining agent into a melt in a furnace, and refining; the purity of the argon is more than or equal to 99.996%; the pressure of the argon is 0.08-0.11 MPa; the adding amount of the refining agent is 0.4-0.6 kg/ton of aluminum;
the pre-casting preparation includes:
preheating a casting plate and a launder, feeding wires online, degassing online, filtering in two stages, and regulating and controlling the casting temperature;
the online wire feeding is realized by arranging a double-path wire feeding mode through an online wire feeding machine, and the grain refiner is an Al5Ti1B alloy wire; the total speed of the online wire feeding is 900-1200 mm/min;
The argon flow of the online degassing tank is 70-75L/min; the argon pressure of the degassing tank is 7.0-7.5 barg; the rotating speed of the rotor of the degassing tank is 650-700 rpm;
The two-stage filtration adopts a two-stage filtration box, and the two-stage filtration box is provided with a ceramic filter plate; the porosity of the ceramic filter plate is 30-60 ppi;
the casting temperature is regulated and controlled to be 730-750 ℃ by filling the filtering box with body aluminum liquid before casting;
the casting method comprises the following steps:
Transferring the pure aluminum liquid into a launder after a filter box by using a ladle filled with the pure aluminum liquid, and flowing through a casting disc to start bottom casting in a crystallizer, immediately accessing 7085 body aluminum liquid after bottom casting, starting an online wire feeder, wherein the casting speed is 12-18 mm/min, the water flow is 36-48 m 3/h, and the temperature of the tail of the casting disc is 690-710 ℃; after casting enters a steady state, an ultrasonic auxiliary device is started above the crystallizer;
The homogenizing annealing method comprises the following steps:
heating to a first temperature and preserving heat for a first time, then heating to a second temperature and preserving heat for a second time, discharging, and naturally cooling to room temperature;
the first temperature is 400-410 ℃; the first time is 14-15 hours;
the second temperature is 470-475 ℃; the second time is 53-55 h.
2. The method of claim 1, wherein the high quality large gauge 7085 aluminum alloy ingot comprises the following components:
0-0.06 wt% of Si;
0-0.08 wt% of Fe;
1.3-2.0wt% Cu;
0 to 0.04wt% Mn;
1.2-1.8wt% of Mg;
0-0.04 wt% of Cr;
7.0-8.0wt% Zn;
0-0.06 wt% of Ti;
0.08-0.15 wt% of Zr;
single impurity less than or equal to 0.05wt%;
the total impurity is less than or equal to 0.15wt%;
The balance being Al.
3. The method of claim 1, wherein the step of determining the position of the substrate comprises,
The primary refining time is 15-30 min;
And carrying out slag skimming and standing after primary refining, wherein the standing time is 20-40 min.
4. The method of claim 1, wherein the online degassing employs a vacuum argon blown dual stage graphite rotor Hycast degassing tank.
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