CN114000020B - Ingot for large-size die forging and preparation method thereof - Google Patents
Ingot for large-size die forging and preparation method thereof Download PDFInfo
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- CN114000020B CN114000020B CN202111289716.4A CN202111289716A CN114000020B CN 114000020 B CN114000020 B CN 114000020B CN 202111289716 A CN202111289716 A CN 202111289716A CN 114000020 B CN114000020 B CN 114000020B
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- 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
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/003—Aluminium alloys
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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Abstract
The invention provides a preparation method of an ingot for a large-size die forging, which comprises the following steps: and smelting and casting the alloy raw material to obtain the cast ingot for the large-size die forging. The key point of the invention is the accurate control of chemical components and the control of casting process parameters. The cast ingot produced according to the chemical composition range determined by the invention has low Fe and Si content, and the cast ingot has few indissolvable phases and is dispersed and distributed. The cast ingot produced according to the casting process parameters of the invention has high structure uniformity and stability, and the cast ingot has less internal metallurgical defects such as micro-porosity and the like and small size. The invention also provides an ingot for the large-size die forging.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to an ingot for a large-size die forging and a preparation method thereof.
Background
The cast ingot with the specification of 450 × 1420mm produced at present is mainly used for an ultra-large aluminum alloy die forging for aerospace, the outline dimension of the blank reaches 140 × 1500 × 3900 mm-140 × 1370 × 4750mm, which is 1.6 times of that of the blank produced before, but because the section of the reinforcing rib and the web plate of the integral frame die forging is changed greatly, the difference of the deformation degree of the reinforcing rib and the web plate is obvious, the web plate with the larger deformation degree can amplify the defects of the original blank by several times, and finally the defect detection in the web plate area of the finished die forging is unqualified. Therefore, how to produce the cast ingot with good metallurgical quality and structure uniformity becomes a key technical condition for solving the preparation of the ultra-large die forging.
Disclosure of Invention
In view of the above, the invention aims to provide an ingot for a large-size die forging and a preparation method thereof.
The invention provides an ingot for a large-size die forging, which comprises the following components:
6.1-6.5 wt% of Zn;
2.05-2.30 wt% of Cu;
2.00-2.25 wt% Mg;
0.09 to 0.11 weight percent of Zr;
less than or equal to 0.06wt% of Fe;
less than or equal to 0.04wt% of Si;
mn less than or equal to 0.02wt%;
less than or equal to 0.05wt% of Ti;
less than or equal to 0.02wt% of Cr;
na of less than or equal to 5 ppm;
ca of less than or equal to 5 ppm;
the balance being Al.
The invention provides a preparation method of an ingot for a large-size die forging, which comprises the following steps:
and smelting and casting the alloy raw materials to obtain the ingot for the large-size die forging.
Preferably, stirring is carried out for 1 to 3 times in each melting process.
Preferably, the stirring time is 5 to 8 minutes.
Preferably, the casting speed is 40 to 50mm/min.
Preferably, the position of the water baffle plate in the casting process is 380mm plus or minus 30mm.
Preferably, the water flow in the casting process is 70-90 m 3 /h。
Preferably, the casting temperature is 725 to 745 ℃.
Preferably, the melting temperature is 720 to 760 ℃.
Preferably, the temperature for adding the Mg ingot and the aluminum-zirconium intermediate alloy in the smelting process is 740 to 760 ℃.
The key point of the invention is the precise control of chemical components and the control of casting process parameters. The cast ingot produced according to the chemical composition range determined by the invention has low Fe and Si content, and the cast ingot has few indissolvable phases and is dispersed and distributed. The cast ingot produced according to the casting process parameters of the invention has high structure uniformity and stability, and the cast ingot has less internal metallurgical defects such as micro-porosity and the like and small size.
Drawings
FIG. 1 is a high power micro-porosity picture of the product prepared in example 1 of the present invention;
FIG. 2 is a high power micro-porosity picture of the product prepared in example 2 of the present invention;
FIG. 3 is a high power microgravity photograph of the product prepared in example 3 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The invention provides an ingot for a large-size die forging, which comprises the following components:
6.1-6.5 wt% of Zn;
2.05-2.30 wt% of Cu;
2.00-2.25 wt% of Mg;
0.09 to 0.11 weight percent of Zr;
less than or equal to 0.06wt% of Fe;
less than or equal to 0.04wt% of Si;
mn of less than or equal to 0.02wt%;
less than or equal to 0.05wt percent of Ti;
less than or equal to 0.02wt% of Cr;
na of less than or equal to 5 ppm;
less than or equal to 5ppm of Ca;
the balance being Al.
In the present invention, the mass content of Zn is preferably 6.2 to 6.4%, more preferably 6.3%; the mass content of Cu is preferably 2.1-2.25%, more preferably 2.15-2.2%; the mass content of Mg is preferably 2.05-2.2%, more preferably 2.1-2.15%; the mass content of Zr is preferably 0.1%; the mass content of the Fe is preferably 0.03-0.05%, and more preferably 0.04%; the mass content of the Si is preferably 0.01 to 0.03%, more preferably 0.02%; the mass content of Mn is preferably less than or equal to 0.01 percent; the mass content of Ti is preferably 0.02-0.03%; the mass content of Cr is preferably less than or equal to 0.01 percent; the mass content of Na is preferably 0.0001-0.0003%; the content of Ca is preferably 0.0001 to 0.0003% by mass.
In the invention, the 7 series alloy belongs to an Al-Zn-Mg-Cu series, main elements Cu, mg and Zn and impurity elements Si and Fe influence various performance indexes of the material, and the amount of the main elements Cu, mg and Zn and the impurity elements Si and Fe in the alloy material depends on chemical components of the alloy, particularly the impurity content of Fe and Si. Fe. Si impurities can generate some insoluble phases in the ingot solidification process. The insoluble phases are hard and brittle, are not coherent with the matrix, are easy to generate interface stripping with the matrix phase, are easy to generate clearance dislocation under lower stress, form pores to become shortcuts for crack propagation and play a role of a crack source, thereby strongly reducing the fracture toughness of the alloy; increasing the purity of the alloy is an effective means of reducing the amount of such second phases and improving the fracture toughness of the alloy.
The invention provides a preparation method of an ingot for a large-size die forging, which comprises the following steps:
and smelting and casting the alloy raw materials to obtain the ingot for the large-size die forging.
The alloy raw materials are not particularly limited, and the raw materials well known to those skilled in the art are adopted to prepare the materials according to the components of the cast ingot for the large-size die forging in the technical scheme.
In the invention, the use proportion of the returning charge in the alloy raw materials is preferably less than or equal to 60wt%.
In the present invention, the alloy raw materials preferably include: al-Ti rods, al-Be master alloys, mg ingots and aluminum zirconium master alloys.
In the invention, the adding temperature of the Mg ingot and the aluminum-zirconium master alloy in the smelting process is preferably 740-760 ℃, more preferably 745-755 ℃, and most preferably 750 ℃; the Al-Be master alloy is preferably added at a temperature of 740 to 760 ℃, more preferably 745 to 755 ℃, most preferably 750 ℃, and is preferably added in a converter chute.
In the present invention, the number of times of stirring, the stirring time, and the like, which affect the uniformity of the chemical composition of the melt, are preferably optimized in the melting process.
In the invention, in the smelting process, the stirring is preferably carried out for 2 to 4 times, more preferably 2 to 3 times, and most preferably 2 times per smelting time; the stirring time is preferably 5 to 8min, more preferably 6 to 7min.
In the invention, the smelting temperature in the smelting process is preferably 720-760 ℃, more preferably 730-750 ℃, and most preferably 740 ℃.
In the present invention, after the melting, the obtained melt is preferably purified in a static furnace and then refined.
In the invention, the refining process preferably adopts furnace bottom air brick refining; the refining medium is preferably argon; the pressure of the argon is preferably 0.25 to 0.4MPa, more preferably 0.3 to 0.35MPa, and most preferably 0.32 to 0.33MPa; the flow rate of the argon gas is preferably 10 to 20L/min/block, more preferably 13 to 17L/min/block, and most preferably 15L/min/block.
In the present invention, the refining preferably further comprises artificial refining, and the number of times of the artificial refining is preferably 1 to 3 times, and more preferably 2 times; the time for the artificial refining is preferably 30 to 40 minutes, more preferably 33 to 37 minutes, and most preferably 35 minutes.
In the present invention, the temperature for refining is preferably 725 to 745 ℃, more preferably 730 to 740 ℃, and most preferably 735 ℃.
In the present invention, it is preferable that the refining further comprises:
and carrying out online purification treatment on the obtained melt.
In the present invention, the gas pressure of the on-line purification treatment is preferably 0.1 to 0.3MPa, more preferably 0.15 to 0.25MPa, and most preferably 0.2MPa; rotational speed of rotorPreferably 230 to 270rpm, more preferably 240 to 260rpm, most preferably 250rpm; the gas comprises Ar gas and Cl gas; the Ar gas flow is preferably 3.5 to 5Nm 3 More preferably 4 to 4.5Nm 3 H, most preferably 4.2 to 4.3Nm 3 H; the Cl gas flow rate is preferably 0.03 to 0.045Nm 3 More preferably 0.035 to 0.04Nm 3 The most preferable range is 0.036 to 0.038Nm 3 /h。
In the present invention, after the on-line purification treatment is completed, the method preferably further comprises:
the resulting melt was filtered.
In the present invention, the filtration is preferably a two stage filtration of 30+ 50ppi.
The method carries out simulation analysis on technological parameters such as casting speed, temperature, cooling strength, height of the water scraper, liquid level height and the like of the 7-series alloy ingot, and mainly simulates the influence of the casting speed and the position of the water baffle on the uniformity of the ingot structure; the changes of temperature field and stress field in the casting process and the influence of technological parameters on macro segregation and microstructure are researched, and a large-scale production test is carried out by combining simulation results.
In the present invention, the casting speed is preferably in the range of 45 to 50mm/min, more preferably 46 to 48mm/min; the position of the water baffle plate in the casting process is preferably 350-410 mm, more preferably 360-400 mm, more preferably 370-390 mm, and most preferably 380mm; the water flow in the casting process is preferably 70-90 m 3 H, more preferably 75 to 85m 3 H, most preferably 83m 3 H; the casting temperature is preferably 725 to 745 ℃, more preferably 730 to 740 ℃, and most preferably 735 ℃.
In the present invention, an in-line grain refiner is preferably added during the casting process; the composition of the in-line grain refiner preferably comprises:
Si≤0.10wt％；
Fe≤0.10wt％；
Cu≤0.02wt％；
Mn≤0.02wt％；
Mg≤0.02wt％；
Cr≤0.02wt％；
Ni≤0.02wt％；
Zn≤0.03wt％；
Ca≤0.005wt％；
Na≤0.005wt％；
B 0.8～1.3wt％；
Pb≤0.01wt％；
Sn≤0.01wt％；
V≤0.03wt％；
Ti 2.5～3.5wt％；
the balance being Al.
In the present invention, the mass content of B is preferably 0.9 to 1.2%, more preferably 1 to 1.1%.
In the present invention, the Ti content is preferably 2.8 to 3.2% by mass, and more preferably 3% by mass.
In the invention, the online grain refiner is 1cm at random 2 In longitudinal section of (1) TiB 2 The average particle size is preferably less than 2 microns, the distribution is uniform and dispersed, and TiB is not present 2 Agglomerating the agglomerates; the amount of the in-line grain refiner added is preferably 1.5 to 3.5kg/t, more preferably 2.0 to 3.0kg/t, and most preferably 1.8kg/t.
In the present invention, the size of the ingot obtained after casting is preferably (430 to 470) × (1400 to 1450) mm, more preferably (440 to 460) × (1410 to 1440) mm, and most preferably 450 × 1420mm. According to the method, through the optimization of the casting process, the structure uniformity and stability of the cast ingot with the specification of 450 × 1420mm are improved, and necessary conditions are provided for the preparation of the ultra-large aluminum alloy die forging. The method provided by the invention can obtain the ingot with finer crystal grains and smaller macrosegregation, reduce the casting speed, effectively reduce the depth of the liquid cavity of the ingot, and reduce the width of the central mushy zone (solid-liquid phase interval), thereby improving the feeding capability and reducing the generation of porosity.
The quality requirements of the cast ingot for the blank of the current ultra-large die forging on the structural uniformity and the metallurgical defects are very high, and the cast ingot produced under the existing casting process conditions cannot meet the requirements on the structural uniformity and the stability. The invention further adjusts, optimizes and refines casting process parameters (casting speed, cooling speed, crystallizer liquid level height, wiper position and the like) to reduce the depth of ingot casting liquid cavity, improve the segregation degree of the dendritic crystal of the core of the ingot casting, reduce the micro-loose size of the core, improve the compactness of casting structure and provide a qualified ingot casting with fine grain, homogeneous and low segregation casting structure and stable quality for the ultra-large die forging.
The key point of the invention is the accurate control of chemical components and the control of casting process parameters. The cast ingot produced according to the chemical composition range determined by the invention has low Fe and Si content, and the cast ingot has few indissolvable phases and is dispersed and distributed. The cast ingot produced according to the casting process parameters of the invention has high structural uniformity and stability, and the cast ingot has less internal metallurgical defects such as micro-porosity and the like and small size.
Example 1
The alloy raw materials are mixed according to the following component contents:
the proportion of returned charge in the burdening process is as follows: less than or equal to 60wt percent, and using an Al-Ti rod to complement the Ti content to 0.015wt percent in a smelting furnace;
alloy raw materials are proportioned and then smelted; the smelting temperature of a smelting furnace in the smelting process is 720-760 ℃, and the temperature for adding Mg ingots and the aluminum-zirconium intermediate alloy is 740-760 ℃; the adding temperature and the adding time of the Al-Be intermediate alloy are as follows: adding the mixture into a converter launder at 740-760 ℃;
purifying the smelted alloy liquid in a standing furnace, refining the alloy liquid, wherein a furnace bottom air brick is refined in the refining process, a refining medium is argon, the pressure of the argon is 0.25-0.4 MPa, the flow of the argon is 10-20L/min/block, and meanwhile, manual refining is assisted for 2 times for 35 minutes; the refining temperature is 730-745 ℃;
carrying out online purification treatment on the refined alloy liquid: the gas pressure is 0.2Mpa, and the rotor rotation speed is 250rpm; ar gas flow 4.0Nm 3 H Cl gas flow 0.04Nm 3 /h；
Filtering the alloy liquid after purification treatment: two-stage filtration with 30+ 50ppi.
Casting the filtered alloy liquid to obtain an aluminum alloy ingot; the casting speed in the casting process is 45mm/min, and the water flow is 83m 3 The casting temperature is 725-745 ℃, the wiper position is 380mm, and the adding amount of the online grain refiner (B is 0.8-1.3 wt%, ti is 2.5-3.5 wt%, and the balance is Al and impurities) is 3.5kg/t.
According to the GB/T20975 standard of 'analysis method of chemical components of aluminum and aluminum alloy', the high-strength aluminum alloy ingot prepared in the embodiment 1 of the invention is subjected to component detection, and the detection result is as follows:
according to the ASTM E34 Standard "aluminum alloy analysis method", 13 aluminum alloy ingots were prepared in the same manner as in example 1, each ingot being broken into 2 blanks of 2000mm in length for a total of 26 blanks; and (3) performing high-power micro-porosity detection, wherein the micro-porosity size is less than or equal to 100 x 40 microns:
a picture of the high power micro-porosity of the product prepared in example 1 is shown in figure 1.
According to the GB/T6519 ultrasonic inspection method for wrought aluminum and magnesium alloy products, 26 pieces of aluminum alloy ingot casting blanks are obtained for multiple times by the method of example 1, flaw detection qualification rate detection is carried out, and all A-grade qualification rates and AA-grade qualification rates of the detection results are 100% and 88%. According to GB/T3246.2 & lt methods for inspecting organization of wrought aluminum and aluminum alloy products & gt, 26 aluminum alloy ingots are obtained for multiple times by the method in example 1, and fracture oxide film qualification rate detection is carried out, wherein the qualification rate of the detection result is 100%.
Example 2
Mixing the alloy raw materials according to the following components;
the proportion of returned charge in the burdening process is as follows: less than or equal to 60wt percent, and using an Al-Ti rod to complement the Ti content to 0.02wt percent in a converter launder;
alloy raw materials are mixed and then smelted; the smelting temperature of a smelting furnace in the smelting process is 720-760 ℃, and the temperature for adding Mg ingots and aluminum-zirconium intermediate alloy is 740-760 ℃; adding temperature and time of the Al-Be intermediate alloy: adding the mixture into a converter launder at 740-760 ℃;
purifying the smelted alloy liquid in a standing furnace, refining the alloy liquid, wherein a furnace bottom air brick is refined in the refining process, a refining medium is argon, the pressure of the argon is 0.25-0.4 MPa, the flow of the argon is 10-20L/min/block, and meanwhile, manual refining is assisted for 2 times for 35 minutes; the refining temperature is 725 to 745 ℃;
carrying out online purification treatment on the refined alloy liquid: the gas pressure is 0.2Mpa, and the rotor rotation speed is 250rpm; ar gas flow 4.0Nm 3 H Cl gas flow 0.04Nm 3 /h；
Filtering the alloy liquid after purification treatment: two-stage filtration with 30+ 50ppi.
Casting the filtered alloy liquid to obtain an aluminum alloy ingot; the casting speed in the casting process is 45mm/min, and the water flow is 83m 3 The casting temperature is 725-745 ℃, the wiper position is 380mm, and the adding amount of the online grain refiner (B is 0.8-1.3 wt%, ti is 2.5-3.5 wt%, and the balance is Al and impurities) is 1.8kg/t.
According to the detection method of the embodiment 1, the components of the aluminum alloy ingot prepared in the embodiment 2 of the invention are detected, and the detection result is as follows:
according to the method of the embodiment 1, 10 aluminum alloy ingots are obtained by the method of the embodiment 2, each ingot is broken into 2 blanks with the length of 2000mm, 20 blanks are detected by high-power micro-loosening, and the micro-loosening size is less than or equal to 100 x 40 microns:
the high power micro-porosity picture of the product prepared in example 2 is shown in figure 2.
According to the detection method of the embodiment 1, 20 pieces of aluminum alloy ingot casting blanks are obtained by multiple times of preparation according to the method of the embodiment 2, and flaw detection qualification rate is detected, wherein the A-grade flaw detection qualification rate is 100%, and the AA-grade flaw detection qualification rate is 100%; and detecting the qualified rate of the fracture oxide film, wherein the qualified rate of the detection result is 100%.
Example 3
The alloy raw materials are mixed according to the following component contents:
the proportion of returned charge in the burdening process is as follows: less than or equal to 60wt%, and using Al-Ti rod to make Ti content up to 0.015wt% in smelting furnace;
alloy raw materials are mixed and then smelted; the smelting temperature of a smelting furnace in the smelting process is 720-740 ℃, and the temperature for adding Mg ingots and aluminum-zirconium intermediate alloy is 740-750 ℃; the adding temperature and the adding time of the Al-Be intermediate alloy are as follows: adding the mixture into a converter launder at 740-760 ℃;
purifying the smelted alloy liquid in a standing furnace, refining the alloy liquid, wherein a furnace bottom air brick is refined in the refining process, a refining medium is argon, the pressure of the argon is 0.25-0.4 MPa, the flow of the argon is 10-20L/min/block, and meanwhile, manual refining is assisted for 2 times for 35 minutes; the refining temperature is 725 to 745 ℃;
carrying out online purification treatment on the refined alloy liquid: the gas pressure is 0.2Mpa, and the rotor rotation speed is 270rpm; ar gas flow rate of 3.5Nm 3 H Cl gas flow 0.04Nm 3 /h；
Filtering the alloy liquid after purification treatment: two-stage filtration with 30+ 50ppi.
Casting the filtered alloy liquid to obtain an aluminum alloy ingot; the casting speed in the casting process is 46mm/min, and the water flow is 88m 3 The casting temperature is 730-750 ℃, the position of a wiper is 360mm, and the adding amount of an online grain refiner (B is 0.8-1.3 wt%, ti is 2.5-3.5 wt%, and the balance is Al and impurities) is 3.5kg/t.
The high-strength aluminum alloy ingot prepared in example 3 of the present invention was subjected to composition detection according to the method of example 1, and the detection results were as follows:
9 aluminum alloy ingots were prepared in a plurality of times according to the test method of example 1 and the method of example 3, and each ingot was broken into 2 blanks of 2000mm in length, and 18 blanks were obtained. And (3) performing high-power micro-porosity detection, wherein the micro-porosity size of the detection result is less than or equal to 100 x 40 microns:
a picture of the high power micro-porosity of the product prepared in example 3 is shown in figure 3.
According to the detection method of the embodiment 1, 18 pieces of aluminum alloy ingot casting blanks are obtained by multiple times of preparation according to the method of the embodiment 3, and flaw detection qualification rate detection is carried out, wherein the A-grade flaw detection qualification rate is 100%, and the AA-grade flaw detection qualification rate is 94%; and detecting the qualified rate of the fracture oxide film, wherein the qualified rate of the detection result is 100%.
The key point of the invention is the accurate control of chemical components and the control of casting process parameters. The cast ingot produced according to the chemical composition range determined by the invention has low Fe and Si content, and the cast ingot has few indissolvable phases and is dispersed and distributed. The cast ingot produced according to the casting process parameters of the invention has high structural uniformity and stability, and the cast ingot has less internal metallurgical defects such as micro-porosity and the like and small size.
While the invention has been described and illustrated with reference to specific embodiments thereof, such description and illustration are not intended to limit the invention. It will be clearly understood by those skilled in the art that various changes in form and details may be made therein without departing from the true spirit and scope of the invention as defined by the appended claims, to adapt a particular situation, material, composition of matter, substance, method or process to the objective, spirit and scope of this application. All such modifications are intended to be within the scope of the claims appended hereto. Although the methods disclosed herein have been described with reference to particular operations performed in a particular order, it should be understood that these operations may be combined, sub-divided, or reordered to form equivalent methods without departing from the teachings of the present disclosure. Accordingly, unless specifically indicated herein, the order and grouping of the operations is not a limitation of the present application.
Claims (1)
1. A preparation method of an ingot for a large-size die forging comprises the following steps:
the alloy raw materials are proportioned, and the proportioned components are as follows:
less than or equal to 0.03wt% of Si, less than or equal to 0.05wt% of Fe, 2.05-2.20 wt% of Cu, less than or equal to 0.01wt% of Mn, 2.05-2.20 wt% of Mg, less than or equal to 0.01wt% of Cr, 6.20-6.40 wt% of Zn, less than or equal to 0.03wt% of Ti, 0.09-0.11 wt% of Zr, 5ppm of Na and Ca, 0.05wt% of single impurity, 0.15wt% of impurity and the balance of Al;
the proportion of returned charge in the burdening process is as follows: less than or equal to 60wt percent, and using an Al-Ti rod to complement the Ti content to 0.02wt percent in a converter launder;
alloy raw materials are mixed and then smelted; the smelting temperature of a smelting furnace in the smelting process is 720-760 ℃, and the temperature for adding Mg ingots and aluminum-zirconium intermediate alloy is 740-760 ℃; the adding temperature and the adding time of the Al-Be intermediate alloy are as follows: adding the mixture into a converter launder at 740-760 ℃;
purifying the smelted alloy liquid in a standing furnace, refining the alloy liquid, wherein a furnace bottom air brick is refined in the refining process, a refining medium is argon, the pressure of the argon is 0.25-0.4 MPa, the flow of the argon is 10-20L/min/block, and meanwhile, manual refining is assisted for 2 times for 35 minutes; the refining temperature is 725 to 745 ℃;
carrying out online purification treatment on the refined alloy liquid: the gas pressure is 0.2MPa, and the rotor rotation speed is 250rpm; ar gas flow 4.0Nm 3 H, cl gas flow 0.04Nm 3 /h；
Filtering the alloy liquid after purification treatment: double-stage filtration with 30+ 50ppi;
casting the filtered alloy liquid to obtain an aluminum alloy ingot; the casting speed in the casting process is 45mm/min, and the water flow is 83m 3 Per hour, the casting temperature is 725 to 745 ℃, the wiper position is 380mm, the online grain refiner, B is 0.8 to 1.3wt percent, ti is 2.5 to 3.5wt percent, and the balance is Al and impurities, and the addition amount is 1.8kg/t;
the cast ingot for the large-size die forging comprises the following components: si 0.02wt%, fe 0.05wt%, cu 2.17wt%, mn 0.01wt%, mg 2.12wt%, cr 0.01wt%, zn 6.32wt%, ti 0.02wt%, zr 0.10wt%, na, ca 2ppm, single impurity 0.05wt%, impurity 0.15wt% in total, and Al in balance.
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| CN202111289716.4A CN114000020B (en) | 2021-11-02 | 2021-11-02 | Ingot for large-size die forging and preparation method thereof |
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