CN111286646A - Al-3Ti-0.5B intermediate alloy roll with high efficiency and low Ti and B element content and manufacturing method thereof - Google Patents

Al-3Ti-0.5B intermediate alloy roll with high efficiency and low Ti and B element content and manufacturing method thereof Download PDF

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CN111286646A
CN111286646A CN202010248307.9A CN202010248307A CN111286646A CN 111286646 A CN111286646 A CN 111286646A CN 202010248307 A CN202010248307 A CN 202010248307A CN 111286646 A CN111286646 A CN 111286646A
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aluminum
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titanium
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陈勇刚
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Hunan Jinlianxing Metallurgical Materials Technology Co ltd
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Hunan Jinlianxing Metallurgical Materials Technology Co ltd
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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
    • 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
    • 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
    • B22D11/005—Continuous casting of metals, i.e. casting in indefinite lengths of wire
    • 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
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    • C22C1/026—Alloys based on aluminium

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Abstract

The invention provides an Al-3Ti-0.5B intermediate alloy roll with high efficiency and low Ti and B element content and a manufacturing method thereof. The invention contains Ti 0.28-0.32 wt% and B0.4-0.6 wt%. The invention changes the internal organization structure and performance of the final Al-Ti-B intermediate alloy roll by adjusting and reducing the content and proportion of Ti and B in the Al-Ti-B alloy and utilizing the specially designed manufacturing process of the invention, thereby improving the refining efficiency. Under the condition of the same using amount, the refining effect is better than that of the Al-Ti-B intermediate alloy Al-5Ti-1B, Al-3Ti-1B and Al-5Ti-0.2B used in the prior art. In addition, the refining rate is met, the increase of metal impurities Ti and B in the product can be greatly reduced, and the problem that the surface quality and other performances of the product are reduced due to the increase of Ti and B is solved.

Description

Al-3Ti-0.5B intermediate alloy roll with high efficiency and low Ti and B element content and manufacturing method thereof
Technical Field
The invention belongs to the technical field of materials, and particularly relates to an Al-3Ti-0.5B medium with high efficiency and low Ti and B element content
A master alloy coil and a method for manufacturing the same.
Background
In order to refine the aluminum alloy grains, the most direct and effective method at home and abroad at present is to add a nucleating agent. In the 50 s of the 20 th century, people find that the aluminum alloy can be obviously refined by adding a small amount of Ti and B elements, and the performance of the aluminum alloy is improved. And researches and invents an aluminum intermediate alloy refiner containing Ti and B elements for refining aluminum alloy grains, reference 1, wherein the most widely used is Al-5Ti-1B intermediate alloy. In industrial practical application, as long as about 0.2 wt% of Al-5Ti-1B intermediate alloy is added into aluminum alloy, for aluminum product casting blanks produced by different aluminum alloy grades and different casting modes, the crystal grains can be reduced to about 200-400 μm from 400-1000 μm.
Initially, an Al-Ti-B master alloy is added to a smelting furnace in ingot form. However, it was subsequently found that the disadvantage of this addition is that the Al-Ti-B refiner will gradually lose its refining effect with the increase of the casting time, giving rise to the problem of the so-called time-decay effect. At the end of the 20 th century, people processed an Al-Ti-B master alloy from an ingot into a wire with a diameter of phi 9.5mm, and then continuously added into a casting launder while casting, so that the problem of timeliness of the Al-Ti-B master alloy is effectively solved. At present, the aluminum-titanium-boron intermediate alloy wires are mainly classified according to the element content: al-5Ti-1B (5% Ti, 1% B wt), Al-3Ti-1B (3% Ti, 1% B wt) and Al-5Ti-0.2B (5% Ti, 0.2% B wt).
The defects and shortcomings of the existing product are as follows:
the aluminum-titanium-boron wire is added into the aluminum alloy, which is beneficial to the two-side performance. The advantages are that: the Al-Ti-B wire has the function of refining the aluminum alloy crystal grains, can improve the ductility of aluminum alloy products, eliminate cast ingot feather-like crystals, reduce internal defects, improve the surface quality, improve the production efficiency and the like. The disadvantages are that: the Ti and B elements are used as foreign impurity elements of the aluminum alloy, so that the content of metal impurities in the aluminum alloy is increased. For products with limited Ti and B contents, including for compound TiAl3、TiB2A limited product will have negative effects. For example, the conductive product requires strict limitation of Ti content to prevent conductivity from being lowered; the aluminum foil product needs to limit TiB2The content of the compound is reduced to reduce the rolling white bar, and the TiB is generated in the rolling process2Rolling holes produced by large aggregates of particles; excessive Ti and B contents will seriously affect the surface quality of the aluminum alloy article. Therefore, in practical application, in order to solve the problem that the grain size of the aluminum foil product reaches the standard and the B element does not exceed the standard, an Al-Ti-B intermediate alloy Al-containing material with low boron content is developed5 Ti-0.2B; however, in order to achieve the desired refining effect, the amount of Al-5Ti-0.2B used must be increased greatly, and the desired effect cannot be achieved.
In general, products Al-5Ti-1B, Al-3Ti-1B and Al-5Ti-0.2B which are widely developed and used in the market at present cannot fully meet the requirement of sufficient grain refinement effect, and can ensure that the product quality is not damaged by impurity elements of Ti and B to certain performances. In addition, the recycling of aluminum alloy products is increasing day by day, and each melting and casting process of recycling needs to add refining elements Ti and B for refining treatment, so that the refining elements Ti and B are accumulated and increased to cause damage to the quality of aluminum products.
Disclosure of Invention
Based on this, it is necessary to provide a method for satisfying the requirement of grain refinement effect, the requirement of aluminum alloy on the limitation of Ti and B metal impurity content, and the aluminum alloy product and the limitation of the aluminum alloy on the Ti and B metal impurity content, aiming at the defects of the existing products in the background art that the existing products can not satisfy the sufficient grain refinement effect and can ensure that the product quality is not damaged by Ti and B impurity elements to certain performances
It is a high-efficiency low-Ti, low-B element Al-3Ti-0.5B intermediate alloy roll and its production method.
A method for manufacturing an Al-3Ti-0.5B intermediate alloy roll with high efficiency and low Ti and B element content comprises the following steps:
1) preparing raw materials: 100 parts of aluminum ingot with the purity of more than or equal to 99.7 percent, 15 parts of potassium fluotitanate and 6 parts of potassium fluoborate are prepared according to the parts by weight.
2) And (3) putting 90 parts of aluminum ingots in a corundum crucible resistance furnace, heating and melting, heating to 700-720 ℃, obtaining aluminum liquid after melting, and turning off a heating power supply.
Then, after fully mixing 15 parts of potassium fluotitanate and 6 parts of potassium fluoborate, gradually adding the mixture into the molten aluminum liquid to carry out the same
And (3) reacting, adding while stirring, dynamically measuring the temperature of the aluminum liquid, and controlling the reaction speed by adjusting the feeding speed so that the temperature of the aluminum liquid is always controlled between 700 and 750 ℃ in the reaction process.
3) After the mixed potassium fluotitanate and potassium fluoborate are added, continuing mechanical stirring to ensure that the potassium fluotitanate and the potassium fluoborate completely react with the aluminum liquid to obtain aluminum-titanium-boron alloy liquid, wherein the temperature of the aluminum-titanium-boron alloy liquid is higher than or equal to 700 ℃;
after the reaction is finished, the corundum crucible resistance furnace is started to preserve heat of the aluminum-titanium-boron alloy liquid at the temperature of 700-750 ℃, and the byproduct high-temperature potassium fluoroaluminate liquid floating on the surface of the aluminum-titanium-boron alloy liquid is scooped out by using an iron ladle.
4) Degassing, deslagging and cleaning the aluminum-titanium-boron alloy liquid: introducing argon with the purity of 99.99 percent into the bottom of the corundum crucible resistance furnace by using a titanium tube, and introducing argon for refining; in the process of introducing argon, continuously taking reaction residues from the aluminum-titanium-boron alloy liquid by the argon;
and after ventilation is finished, scooping out the scum on the surface.
5) Carrying out heat treatment on the aluminum-titanium-boron alloy liquid: after degassing, deslagging and cleaning are finished, the aluminum-titanium-boron alloy liquid is added in 50-60% as soon as possible
Raising the temperature to 950-980 ℃ within minutes, and then preserving the temperature for 60 minutes.
6) And (3) rapidly cooling the aluminum-titanium-boron alloy liquid: the corundum crucible resistance furnace is cut off and the heat preservation is stopped, and the remaining 10 parts of aluminum are quickly removed
And (3) adding the ingot into a corundum crucible resistance furnace, stirring while adding, and quickly cooling the aluminum-titanium-boron alloy liquid to 700-750 ℃.
7) Pouring the aluminum-titanium-boron alloy liquid cooled in the step 6) into a heat insulation box at the inlet of a crystallization wheel of a continuous casting and rolling machine from a corundum crucible resistance furnace continuously, and opening a manufacturing machine and the continuous rolling machine for casting and rolling to obtain the Al-3Ti-0.5B intermediate alloy wire.
8) The obtained Al-3Ti-0.5B intermediate alloy wire is rewound into a coil according to the specification and the size required by the standard, the broken end part needs to be welded by using a touch welding machine, and the joint is polished and wound after being polished to be bright, so that the Al-3Ti-0.5B intermediate alloy coil is prepared.
In one embodiment, in the step 2), the reaction between the potassium fluotitanate and the potassium fluoborate and the aluminum liquid is an exothermic reaction, the temperature of the aluminum liquid is continuously increased after the mixed potassium fluotitanate and the mixed potassium fluoborate are added for reaction, and the reaction speed is controlled by adjusting the feeding speed, so that the temperature increase and the reaction temperature are controlled, and the temperature of the aluminum liquid is always controlled between 700 ℃ and 750 ℃ in the reaction process.
In one embodiment, in the step 3), the mechanical stirring is continued for 3 to 5 minutes.
In one embodiment, in the step 4), the duration of refining by introducing argon is 5-10 minutes.
In one embodiment, the step 6) of adding the aluminum ingot is completed within 1-2 minutes, and the step of cooling is completed within 18 minutes.
In one embodiment, the diameter of the Al-3Ti-0.5B master alloy wire obtained in the step 7) is 9.5-10.05 mm.
An Al-3Ti-0.5B intermediate alloy roll with high efficiency and low Ti and B element content comprises 0.28-0.32 percent of Ti and 0.4-0.6 percent of B by mass percent.
Advantages and beneficial effects of the invention
The invention changes the internal organization structure and performance of the final Al-Ti-B intermediate alloy roll by adjusting and reducing the content and proportion of Ti and B in the Al-Ti-B alloy and utilizing the specially designed manufacturing process of the invention, thereby improving the refining efficiency. Namely, the content of Ti and B in the intermediate alloy refiner is reduced, and the compound TiAl in the intermediate alloy is optimized3、TiB2The proportion, the size and the distribution uniformity of the intermediate alloy refiner are reduced, and the nucleation efficiency of the intermediate alloy refiner is improved by reducing agglomeration. Under the condition of the same using amount, the refining effect is better than that of the currently used Al-Ti-1B, Al-3Ti-1B and Al-5Ti-0.2B intermediate alloys. In addition, the refining rate is met, the increase of metal impurities Ti and B in the product can be greatly reduced, and the problem that the surface quality and other performances of the product are reduced due to the increase of Ti and B is solved.
1. In terms of alloy composition: the aluminum-titanium-boron wire prepared by the invention is Al-3Ti-0.5B, namely the weight ratio of Ti: and B is 3: 0.5. The special weight ratio is matched with the process conditions of the invention, not only can meet the requirement of grain refinement efficiency, but also can meet the requirement of the aluminum alloy on the content of Ti and B impurities, and does not damage other properties of the aluminum alloy product.
2. In the aspect of manufacturing process: the invention designs special smelting and process, which comprises the control of charging time, charging sequence and reaction temperature, in particular to the liquid heat speed treatment of alloy melt after the reaction is finished, thereby ensuring TiAl3、TiB2Uniformity and dispersibility of the particle size of the intermetallic compound. According to the phase diagram analysis, TiAl is adopted in the heat preservation process of the heat-speed treatment3The particles are continuously dissolved in the aluminum-titanium-boron alloy liquid; large TiAl3Partially dissolved particles, partially small TiAl3The particles are completely dissolved; compound TiAl in liquid3Reduction of the total amount of particles (quantity and total weight), TiB2The total amount (quantity and total amount) of particles is kept constant; but the liquid fluidity of the Al-Ti-B alloy is increased due to the increase of the temperature, TiAl3And TiB2The compound particles become dispersed; especially for TiB which is prone to agglomeration2The compound particles are changed from larger agglomerated masses to smaller agglomerated masses.
3. In the aspect of wire forming: continuous casting and rolling processes are selected, high-efficiency aluminum-titanium-boron wires (Al-3 Ti-0.5B) with the diameter of 9.5-10.05 mm and low Ti and B contents are prepared, and the wires are rewound into coils according to the standard required specification and size.
4. The product has the advantages of relatively simple process, easy control of the process, high yield, energy conservation, environmental protection, suitability for large-scale industrial production and wide application prospect.
Drawings
FIG. 1 is a gold phase diagram of Al-3Ti-0.5B prepared in example 1.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to make the aforementioned objects, features and advantages of the invention more comprehensible. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Example 1
A method for manufacturing an Al-3Ti-0.5B intermediate alloy roll with high efficiency and low Ti and B element content comprises the following steps:
1) preparing raw materials: 100 kg of aluminum ingot with the purity of more than or equal to 99.7 percent, 15 kg of potassium fluotitanate and 6 kg of potassium fluoborate are prepared according to the parts by weight.
2) And (3) putting 90 kg of aluminum ingot in a corundum crucible resistance furnace, heating to melt, heating to 720 ℃, obtaining aluminum liquid after melting, and turning off a heating power supply.
Then, after fully mixing 15 kg of potassium fluotitanate and 6 kg of potassium fluoborate, gradually adding the mixture into the molten aluminum liquid
Carrying out reaction, adding while stirring, and dynamically measuring the temperature of the aluminum liquid; the reaction of the potassium fluotitanate and the potassium fluoborate with the aluminum liquid is an exothermic reaction, the temperature of the aluminum liquid is continuously increased after the mixed potassium fluotitanate and the potassium fluoborate are added to start the reaction, and the reaction speed is controlled by adjusting the feeding speed, so that the temperature is increased and the reaction temperature is controlled, and the temperature of the aluminum liquid is always controlled between 700 and 750 ℃ in the reaction process.
3) After the mixed potassium fluotitanate and potassium fluoborate are added, continuing to mechanically stir for 3-5 minutes to ensure that the potassium fluotitanate and the potassium fluoborate are completely the same as aluminum
After the liquid reaction is finished, obtaining an aluminum-titanium-boron alloy liquid, wherein the temperature of the aluminum-titanium-boron alloy liquid is 730 ℃;
after the reaction is finished, the corundum crucible resistance furnace is started to preserve heat of the aluminum-titanium-boron alloy liquid at the temperature of 700-750 ℃, and the byproduct high-temperature potassium fluoroaluminate liquid floating on the surface of the aluminum-titanium-boron alloy liquid is scooped out by using an iron ladle.
4) Degassing, deslagging and cleaning the aluminum-titanium-boron alloy liquid: introducing argon with the purity of 99.99 percent into the bottom of a corundum crucible resistance furnace by using a titanium tube, and introducing argon for refining for 8 minutes; in the process of introducing argon, continuously taking reaction residues from the aluminum-titanium-boron alloy liquid by the argon;
and after ventilation is finished, scooping out the scum on the surface. The length of the argon gas introducing time determines the residual slag content in the aluminum-titanium-boron alloy liquid.
5) Carrying out heat treatment on the aluminum-titanium-boron alloy liquid: after degassing, deslagging and cleaning, the Al-Ti-B alloy liquid is added into the bath at 50 deg.C as soon as possible
The temperature was raised to 950 ℃ within minutes and then maintained for 60 minutes. Based on phase diagram analysis, TiAl is present during this incubation3The particles are continuously dissolved in the aluminum-titanium-boron alloy liquid; large TiAl3Partially dissolved particles, partially small TiAl3The particles are completely dissolved; compound TiAl in liquid3Reduction of the total amount of particles (quantity and total weight), TiB2The total amount (quantity and total amount) of particles is kept constant; but the liquid fluidity of the Al-Ti-B alloy is increased due to the increase of the temperature, TiAl3And TiB2The compound particles become dispersed; especially for TiB which is prone to agglomeration2The compound particles are changed from larger agglomerated masses to smaller agglomerated masses.
6) And (3) rapidly cooling the aluminum-titanium-boron alloy liquid: and (3) powering off the corundum crucible resistance furnace, stopping heat preservation, quickly adding the remaining 10 kilograms of aluminum ingots into the corundum crucible resistance furnace, stirring while adding, quickly cooling the aluminum-titanium-boron alloy liquid to 730 ℃, completing the step 6) of adding the aluminum ingots within 1-2 minutes, and completing the cooling within 18 minutes.
7) Continuously pouring the aluminum-titanium-boron alloy liquid cooled in the step 6) into a heat insulation box at the inlet of a crystallization wheel of a continuous casting and rolling machine from a corundum crucible resistance furnace, and starting a manufacturing machine and the continuous rolling machine for casting and rolling to obtain an Al-3Ti-0.5B intermediate alloy wire rod with the diameter of 9.5 mm;
8) the obtained Al-3Ti-0.5B intermediate alloy wire is rewound into a coil according to the specification and the size required by the standard, the broken end part needs to be welded by using a touch welding machine, the joint is polished and wound after being polished to be bright, and the Al-3Ti-0.5B intermediate alloy coil is manufactured, wherein a figure 1 is a metallographic diagram of Al-3 Ti-0.5B.
The Al-3Ti-0.5B intermediate alloy roll of example 1, which is highly efficient and has low Ti and B element contents, contains 0.31% Ti and 0.53% B by mass. Table 1 shows the chemical composition analysis comparison table of the Al-3Ti-0.5B intermediate alloy roll prepared in example 1 and Al-5Ti-1B in the prior art.
TABLE 1 chemical composition analysis comparison table of Al-3Ti-0.5B intermediate alloy roll of example 1 and conventional Al-5Ti-1B
Figure DEST_PATH_IMAGE002
The product of this example 1 is an Al-Ti-B wire (Al-3 Ti-0.5B) intermediate alloy coil with high efficiency and low Ti and B element content, and the conventional Al-Ti-B wire
And (3) comparing the grain refining effects of the boron wire Al-5 Ti-1B. The experiment is carried out by adopting a pure aluminum ring with the purity of 99.7 percent of the non-ferrous metal industry standard, and the adding amount of the two refiners is 0.2 percent by weight. Table 2 shows the grain refining effect of the high-efficiency low-Ti Al-3Ti-0.5B intermediate alloy roll of the product of the embodiment 1 and the existing product Al-5Ti-1B for 99.7 wt% pure aluminum.
TABLE 2 comparison of Al-3Ti-0.5B intermediate alloy roll of the product of this example 1 with the grain refining effect of the conventional Al-5Ti-1B
Figure 286556DEST_PATH_IMAGE004
The experimental data from table 2 indicate: the intermediate alloy roll with high efficiency, low Ti content and B element content Al-3Ti-0.5B of the product of the embodiment 1 has the same adding amount as the existing product Al-5Ti-1B, and the Al-3Ti-0.5B of the product of the embodiment 1 has the refining effect superior to the existing product Al-5 Ti-1B. That is, compared with the existing product Al-5Ti-1B, the addition of Ti and B in the present example 1 can be reduced by at least 40% under the same refining condition.
Example 2
Example 2 differs from example 1 in that the composition of the raw material aluminum ingot used in example 2, which had a purity of 99.7% or more, was somewhat different from that of example 1, and table 3 is a chemical composition table of the element content of the high-performance low-Ti, B element content Al-3Ti-0.5B intermediate alloy roll prepared in example 2.
TABLE 3 EXAMPLE 2 table of chemical composition of element content of Al-3Ti-0.5B intermediate alloy rolls of high efficiency and low Ti, B element content
Figure 872871DEST_PATH_IMAGE006
The other single elements in the table 3 refer to other single elements except Si, Fe, Ti, V, B and Al in the Al-3Ti-0.5B, and the content of each other single element is less than or equal to 0.03 percent. The remaining sum refers to the sum of all other individual elements, and the sum of all other individual elements is present in an amount of < 0.1%.
The invention has the advantages and beneficial effects that:
1. in terms of alloy composition: the aluminum-titanium-boron wire prepared by the invention is Al-3Ti-0.5B, namely the weight ratio of Ti: and B is 3: 0.5. The special weight ratio is matched with the process conditions of the invention, not only can meet the requirement of grain refinement efficiency, but also can meet the requirement of the aluminum alloy on the content of Ti and B impurities, and does not damage other properties of the aluminum alloy product.
2. In the aspect of manufacturing process: the invention designs special smelting and process, which comprises the control of charging time, charging sequence and reaction temperature, in particular to the liquid heat speed treatment of alloy melt after the reaction is finished, thereby ensuring TiAl3、TiB2Uniformity and dispersibility of the particle size of the intermetallic compound. According to the phase diagram analysis, TiAl is adopted in the heat preservation process of the heat-speed treatment3The particles are continuously dissolved in the aluminum-titanium-boron alloy liquid; large TiAl3Partially dissolved particles, partially small TiAl3The particles are completely dissolved; compound TiAl in liquid3Reduction of the total amount of particles (quantity and total weight), TiB2The total amount (quantity and total amount) of particles is kept constant; but the liquid fluidity of the Al-Ti-B alloy is increased due to the increase of the temperature, TiAl3And TiB2The compound particles become dispersed; especially for TiB which is prone to agglomeration2The compound particles are changed from larger agglomerated masses to smaller agglomerated masses.
3. In the aspect of wire forming: continuous casting and rolling processes are selected, high-efficiency aluminum-titanium-boron wires (Al-3 Ti-0.5B) with the diameter of 9.5-10.05 mm and low Ti and B contents are prepared, and the wires are rewound into coils according to the standard required specification and size.
4. The product has the advantages of relatively simple process, easy control of the process, high yield, energy conservation, environmental protection, suitability for large-scale industrial production and wide application prospect.
Generally speaking, the method for preparing the Al-Ti-B intermediate alloy wire by adding Ti and B elements into molten aluminum mainly comprises the following steps: potassium fluotitanate and potassium fluoborate process, titanium sponge and potassium fluoborate process, and titanium and boron oxide electrolysis process. Practice proves that the aluminum-titanium-boron alloy produced by the reaction of potassium fluotitanate, potassium fluoborate (fluoride method) and aluminum liquid has the best refining efficiency.
Except for the use of raw materials, the processing and manufacturing method of the aluminum-titanium-boron intermediate alloy wire mainly comprises the following steps: a semi-continuous casting + extrusion method, a continuous casting + continuous extrusion method, and a continuous casting-rolling method. Wherein, the continuous casting and rolling method has simple process control and stable and reliable product quality.
The quality (thinning effect) of the aluminum-titanium-boron wire prepared by the fluoride salt method is closely related to the component design and has a great relationship with the preparation process. Factors that affect the manufacturing process include: raw material feeding sequence, feeding speed, reaction temperature control, and method for treating molten aluminum after completion of reaction, etc. [2]]. In addition, the subsequent machining and forming process has great influence. That is, for the same alloy composition of Al-Ti-B wires, the difference in the manufacturing process may cause a large difference in the refining efficiency. The essential reason for this is the difference in the intrinsic composition and structure of the al-ti-b alloy due to the different manufacturing processes. For example: TiAl compound formed among Al, Ti and B elements3And TiB2The size and shape of the wire, the distribution uniformity of compound particles, and the like, and also determine the thinning effect of the Al-Ti-B wire to a great extent, reference [3]]。
The references mentioned in this patent are as follows:
reference [1 ]: cibala, the Mechanism of gain Refinement of Sand Casting in aluminum
Alloys[J].Journal of The Institute of Metals ,1949-1950,76(4):321-360
Reference [2 ]: zhangming Jun: two-step production of aluminum-titanium-boron master alloys [ J ] light metals, 1989 (11: 51-55)
Reference [3 ]: gain element of aluminum by Addition of aluminum master
Alloys；[Ph.D.Thesis].Communications ,No.4,Stockholm University,1981
The above-mentioned embodiments only express one embodiment of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (7)

1. A method for manufacturing an Al-3Ti-0.5B intermediate alloy roll with high efficiency and low Ti and B element content is characterized by comprising the following steps:
1) preparing raw materials: preparing 100 parts of aluminum ingot with the purity of more than or equal to 99.7 percent, 15 parts of potassium fluotitanate and 6 parts of potassium fluoborate according to parts by weight;
2) putting 90 parts of aluminum ingots in a corundum crucible resistance furnace, heating and melting, heating to 700-720 ℃, obtaining aluminum liquid after melting, and turning off a heating power supply;
then, after fully mixing 15 parts of potassium fluotitanate and 6 parts of potassium fluoborate, gradually adding the mixture into the molten aluminum liquid to carry out the same
Reacting, adding while stirring, dynamically measuring the temperature of the aluminum liquid, and controlling the reaction speed by adjusting the feeding speed so that the temperature of the aluminum liquid is always controlled between 700 and 750 ℃ in the reaction process;
3) after the mixed potassium fluotitanate and potassium fluoborate are added, continuing mechanical stirring to ensure that the potassium fluotitanate and the potassium fluoborate completely react with the aluminum liquid to obtain aluminum-titanium-boron alloy liquid, wherein the temperature of the aluminum-titanium-boron alloy liquid is higher than or equal to 700 ℃;
after the reaction is finished, the corundum crucible resistance furnace is started to preserve heat of the aluminum-titanium-boron alloy liquid at the temperature of 700-750 ℃, and the by-product high-temperature potassium fluoroaluminate liquid floating on the surface of the aluminum-titanium-boron alloy liquid is scooped out by using an iron ladle;
4) degassing, deslagging and cleaning the aluminum-titanium-boron alloy liquid: introducing argon with the purity of 99.99 percent into the bottom of the corundum crucible resistance furnace by using a titanium tube, and introducing argon for refining; in the process of introducing argon, continuously taking reaction residues from the aluminum-titanium-boron alloy liquid by the argon;
scooping out the scum on the surface after ventilation is finished;
5) carrying out heat treatment on the aluminum-titanium-boron alloy liquid: after degassing, deslagging and cleaning are finished, the aluminum-titanium-boron alloy liquid is added in 50-60% as soon as possible
Raising the temperature to 950-980 ℃ within minutes, and then preserving the heat for 60 minutes;
6) and (3) rapidly cooling the aluminum-titanium-boron alloy liquid: the corundum crucible resistance furnace is cut off and the heat preservation is stopped, and the remaining 10 parts of aluminum are quickly removed
Adding the ingot into a corundum crucible resistance furnace, stirring while adding, and quickly cooling the aluminum-titanium-boron alloy liquid to 700-750 ℃;
7) continuously pouring the aluminum-titanium-boron alloy liquid cooled in the step 6) into a heat insulation box at the inlet of a crystallization wheel of a continuous casting and rolling machine from a corundum crucible resistance furnace, and starting a manufacturing machine and the continuous rolling machine for casting and rolling to obtain an Al-3Ti-0.5B intermediate alloy wire;
8) the obtained Al-3Ti-0.5B intermediate alloy wire is rewound into a coil according to the specification and the size required by the standard, the broken end part needs to be welded by using a touch welding machine, and the joint is polished and wound after being polished to be bright, so that the Al-3Ti-0.5B intermediate alloy coil is prepared.
2. The method for manufacturing the Al-3Ti-0.5B intermediate alloy roll with high efficiency and low Ti and B element content as claimed in claim 1, wherein in the step 2), the reaction of the potassium fluotitanate and the potassium fluoborate with the aluminum liquid is an exothermic reaction, the temperature of the aluminum liquid is continuously increased after the mixed potassium fluotitanate and potassium fluoborate are added to start the reaction, and the reaction speed is controlled by adjusting the feeding speed, so that the temperature increase and the reaction temperature are controlled, and the temperature of the aluminum liquid is always controlled between 700 ℃ and 750 ℃ in the reaction process.
3. The method for manufacturing the Al-3Ti-0.5B intermediate alloy coil with high efficiency and low Ti and B element content according to claim 1, wherein the mechanical stirring is continued for 3-5 minutes in the step 3).
4. The method for manufacturing the Al-3Ti-0.5B intermediate alloy coil with high efficiency and low Ti and B element content according to claim 1, wherein the refining time by introducing argon in the step 4) is 5-10 minutes.
5. The method for manufacturing the Al-3Ti-0.5B intermediate alloy coil with high efficiency and low Ti and B element content according to claim 1, wherein the step 6) of adding the aluminum ingot is completed within 1-2 minutes, and the step of cooling is completed within 18 minutes.
6. The method for manufacturing an Al-3Ti-0.5B intermediate alloy coil with high efficiency and low Ti and B element content according to claim 1, wherein the diameter of the Al-3Ti-0.5B intermediate alloy wire obtained in the step 7) is 9.5 to 10.05 mm.
7. An Al-3Ti-0.5B intermediate alloy roll with high efficiency and low Ti and B element content is characterized by comprising 0.28-0.32 percent of Ti and 0.4-0.6 percent of B by mass percent.
CN202010248307.9A 2020-04-01 2020-04-01 Al-3Ti-0.5B intermediate alloy roll with high efficiency and low Ti and B element content and manufacturing method thereof Pending CN111286646A (en)

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