CN113957278A - Preparation method of TA22 titanium alloy ingot - Google Patents

Preparation method of TA22 titanium alloy ingot Download PDF

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CN113957278A
CN113957278A CN202111260203.0A CN202111260203A CN113957278A CN 113957278 A CN113957278 A CN 113957278A CN 202111260203 A CN202111260203 A CN 202111260203A CN 113957278 A CN113957278 A CN 113957278A
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welding
electrode
ingot
nickel
titanium alloy
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CN113957278B (en
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刘华
贠鹏飞
李维
王超南
李佳佳
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WESTERN TITANIUM TECHNOLOGIES CO LTD
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WESTERN TITANIUM TECHNOLOGIES CO LTD
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making non-ferrous alloys
    • C22C1/02Making non-ferrous alloys by melting
    • C22C1/03Making non-ferrous alloys by melting using master alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C22C14/00Alloys based on titanium

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Abstract

The invention discloses a preparation method of a TA22 titanium alloy ingot, which comprises the following steps: firstly, according to the design components of a target product TA22 titanium alloy ingot, pressing an electrode block by using titanium sponge, aluminum beans, aluminum-molybdenum alloy, nickel-molybdenum alloy and zirconium sponge as raw materials; secondly, assembling and welding the electrode blocks to obtain a consumable electrode; and thirdly, performing VAR smelting on the consumable electrode to obtain a TA22 titanium alloy ingot. According to the invention, the nickel-molybdenum alloy is adopted to replace the titanium-nickel alloy as the nickel element source, so that the raw material cost is saved, the raw material is directly added in a dispersing manner without shearing, the production efficiency is greatly improved, the production period is shortened, the VAR smelting process is controlled, the raw material is promoted to be melted and uniformly diffused in the VAR smelting process, the nickel element segregation is prevented, the high-quality TA22 titanium alloy cast ingot without metallurgical defects is prepared, and the quality of the TA22 titanium alloy cast ingot is improved.

Description

Preparation method of TA22 titanium alloy ingot
Technical Field
The invention belongs to the technical field of titanium alloy preparation, and particularly relates to a preparation method of a TA22 titanium alloy ingot.
Background
The nominal component of the TA22 (also known as Ti31) titanium alloy is Ti-3Al-1Mo-1Ni-1Zr, and currently, sponge titanium, aluminum beans, aluminum molybdenum alloy, titanium nickel alloy and sponge zirconium are generally used as raw materials in industrial production, and cast ingots are smelted by a VAR method (vacuum consumable arc furnace smelting). The nickel element is added in a titanium-nickel alloy form, a special titanium-nickel alloy for titanium alloy produced by an intermediate alloy manufacturer does not exist in the market, and only a finished titanium-nickel wire can be actually used. Compared with the special intermediate alloy for titanium alloy, the titanium-nickel alloy for producing TA22 cast ingot has the following disadvantages: (1) the titanium-nickel alloy is a finished wire material, is expensive, has the unit price of about 800 yuan/kg (fluctuating along with market price) at present, and is not beneficial to reducing the manufacturing cost of the titanium alloy; (2) for titanium alloy production, the titanium-nickel alloy wire cannot meet the requirement of pressing an electrode when an ingot is prepared by a VAR method, cannot be directly used and needs to be sheared; however, no special shearing equipment is available in the market at present, manual shearing is needed, the production efficiency is low, and the lead time of TA22 cast ingots is seriously influenced.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method for preparing a TA22 titanium alloy ingot, aiming at the defects of the prior art. According to the method, the nickel-molybdenum alloy is adopted to replace the titanium-nickel alloy as the nickel element source, so that the raw material cost is saved, the raw material is directly added in a dispersing manner without shearing, the production efficiency is greatly improved, the production period is shortened, the VAR smelting process is controlled, the raw material is promoted to be melted and uniformly diffused in the VAR smelting process, the nickel element segregation is prevented, the high-quality TA22 titanium alloy cast ingot without metallurgical defects is prepared, and the quality of the TA22 titanium alloy cast ingot is improved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a preparation method of a TA22 titanium alloy ingot is characterized by comprising the following steps:
according to the design components of a target product TA22 titanium alloy ingot, pressing an electrode block by using titanium sponge, aluminum beans, aluminum-molybdenum alloy, nickel-molybdenum alloy and zirconium sponge as raw materials;
step two, carrying out assembly welding on the electrode block pressed in the step one by adopting a vacuum plasma welding box to obtain a consumable electrode; the assembly welding in the step two comprises the following specific processes: fixing and closely arranging electrode block blocks by using a clamp, then pushing the electrode block blocks into a vacuum plasma welding box, closing a box door, vacuumizing, adjusting the pressure rise rate, introducing argon to start welding, and cooling and discharging the electrode block blocks after the welding is finished;
step three, performing more than three times of VAR smelting on the consumable electrode obtained in the step two by adopting a vacuum consumable electrode electric arc furnace to obtain a TA22 titanium alloy ingot; the specific process of more than three times of VAR smelting comprises the following steps:
step 301, assembling a crucible with the size diameter multiplied by the height of 500mm multiplied by 2600mm and a bottom pad, then loading the crucible and the bottom pad into a smelting station, then loading a consumable electrode into the crucible for fixing, sealing the furnace and vacuumizing;
step 302, welding the consumable electrode and the auxiliary electrode vacuumized in the step 301 in a vacuum consumable arc furnace, controlling the vacuum degree before welding to be not more than 10Pa and the welding current to be 2 kA-15 kA, obtaining a primary welding electrode after welding, cooling for more than 40min, and then taking out of the furnace for inspection;
step 303, sending the primary welding electrode obtained in the step 302 into a vacuum consumable arc furnace, sealing the furnace again, vacuumizing, controlling the vacuum degree before melting to be not more than 5Pa and the gas leakage rate to be not more than 0.6Pa/min, and then sending electricity to start arcing for primary melting to obtain a primary ingot; the voltage of the primary smelting is 34V-35V;
step 304, cleaning the primary ingot obtained in the step 303 by using an ingot cleaning machine, then performing facing to enable the fins to be not more than 5mm by using a lathe, then placing the processed ingots and an auxiliary electrode in a vacuum consumable arc furnace for welding, controlling the vacuum degree before melting to be not more than 10Pa, controlling the welding current to be 2 kA-15 kA, obtaining a secondary welding electrode after welding, cooling for more than 60min, and then taking out of the furnace for inspection;
305, conveying the secondary welding electrode obtained in the step 304 into a vacuum consumable arc furnace, sealing the furnace again, vacuumizing, controlling the vacuum degree before melting to be not more than 5Pa and the gas leakage rate to be not more than 0.6Pa/min, and then transmitting power to start arcing for secondary melting to obtain a secondary ingot; the voltage of the secondary smelting is 33V-34V;
step 306, cleaning the secondary ingot obtained in the step 305 by using an ingot cleaning machine, then performing facing to enable the fins to be not more than 5mm by using a lathe, placing the secondary ingot and an auxiliary electrode in a vacuum consumable arc furnace for welding, controlling the vacuum degree before welding to be not more than 10Pa and the welding current to be 2 kA-15 kA, obtaining a third welding electrode after welding, cooling for more than 60min, and then discharging for inspection;
307, feeding the tertiary welding electrode obtained in the step 306 into a vacuum consumable arc furnace, re-sealing the furnace, vacuumizing, controlling the vacuum degree before melting to be not more than 1.33Pa and the gas leakage rate to be not more than 0.6Pa/min, then feeding power to initiate arc for product melting, and feeding at the later stage of melting to obtain a TA22 titanium alloy ingot; the voltage for smelting the product is 33V-34V.
According to the invention, titanium sponge, aluminum beans, aluminum-molybdenum alloy, nickel-molybdenum alloy and sponge zirconium are used as raw materials, the raw materials are pressed into an electrode block and then are assembled and welded, VAR smelting is carried out to prepare a TA22 titanium alloy ingot, the nickel-molybdenum alloy (the current unit price is about 350 yuan/kg) is adopted to replace the traditional titanium-nickel alloy (the current unit price is about 800 yuan/kg) to serve as a nickel element source, the raw material cost is saved (the 5000 yuan/ton product is reduced in anticipation), and the raw materials are directly added in a dispersing manner without shearing processing, so that the production efficiency is greatly improved; meanwhile, aiming at the characteristic of high melting point of the nickel-molybdenum alloy, the invention firstly controls the granularity of the nickel-molybdenum alloy to promote the nickel-molybdenum alloy to be fully melted, and controls the size specification of a product cast ingot by combining with the control of small specification of a melting crucible, thereby promoting the uniform dispersion of each element and avoiding the macro segregation of the easily segregated element nickel in the product cast ingot; then, by at least more than three times of VAR smelting, the voltage and arc stabilizing stirring parameters of the primary smelting, the secondary smelting and the finished product smelting are respectively controlled, the proper smelting speed is kept during the primary smelting, the impurities in the sponge titanium are promoted to be fully volatilized and removed, the phenomena of slag falling and lump falling at the welding seam of the consumable electrode during assembly welding are prevented, the proper molten pool temperature is maintained during the secondary smelting, the melting of the high-melting-point impurities and the uniform diffusion of alloy elements are promoted, the shallow molten pool depth and the proper temperature gradient are maintained during the finished product smelting, the segregation of nickel elements is prevented, the molten pool is properly stirred to refine grains, and cast ingots with good cast grain shape and distribution, no metallurgical defects such as air holes and inclusion in the molten pool, and good surface quality are obtained; generally, a mode of gradually reducing smelting current is adopted during each smelting so as to maintain stable smelting speed and molten pool depth and prevent the segregation trend from increasing due to the increase of the molten pool depth in the later stage of smelting; in addition, feeding is carried out in the later stage of smelting of finished products, proper consumable electrode reserved mass is controlled, current and voltage are gradually reduced according to a specific mode, reasonable feeding time is controlled, and segregation of nickel elements at the head of a TA22 titanium alloy cast ingot is further prevented; according to the invention, through controlling the process parameters of VAR smelting, the raw materials are promoted to be melted and uniformly diffused in the VAR smelting process, the nickel element segregation is prevented, the TA22 titanium alloy ingot with high quality and no metallurgical defect is prepared, and the quality of the TA22 titanium alloy ingot is improved.
The preparation method of the TA22 titanium alloy ingot is characterized in that in the first step, the grade of the nickel-molybdenum alloy is NiMo30, and the mass contents of the elements in the nickel-molybdenum alloy are as follows: 27.5 to 29.0 percent of Mos, less than or equal to 0.10 percent of Fe, less than or equal to 0.10 percent of O, less than or equal to 0.05 percent of C, less than or equal to 0.15 percent of Si, no more than 0.10 percent of other single elements of W, Pb, Cu, Sn, Zr and Y, and the balance of nickel. According to the invention, the mark of the nickel-molybdenum alloy is preferably NiMo30, and the chemical components in the nickel-molybdenum alloy are controlled, so that the component proportion meets the batching requirement of the TA22 titanium alloy ingot, the content of impurity elements in the TA22 titanium alloy ingot is effectively controlled, and the quality of the TA22 titanium alloy ingot is ensured.
The preparation method of the TA22 titanium alloy ingot is characterized in that in the first step, the nickel-molybdenum alloy is in the shape of chips with the size width multiplied by the length multiplied by the thickness of (5-12) mmx (5-15) mmx (0.5-1) mm. According to the invention, by limiting the shape and specification size of the nickel-molybdenum alloy, the uniformity of material distribution during subsequent electrode pressing is improved, and meanwhile, the sufficient melting and uniform diffusion of raw materials in the VAR smelting process are facilitated.
The preparation method of the TA22 titanium alloy ingot is characterized in that before the electrode is pressed in the first step, the surface of the nickel-molybdenum alloy is treated until the surface is clean, and no visible oil stain, oxidation film and other metal and nonmetal inclusions exist. The method carries out surface treatment on the nickel-molybdenum alloy in advance to remove oil stains, oxidation films and impurities on the surface of the nickel-molybdenum alloy, avoids introducing impurities into the raw materials, and further ensures the quality of the TA22 titanium alloy ingot.
The preparation method of the TA22 titanium alloy ingot is characterized in that when the nickel-molybdenum alloy in the step one is used as a multi-furnace raw material batch, the mass content difference of Mo in the nickel-molybdenum alloys of different batches is less than 0.5%. According to the invention, by controlling the Mo content difference in the nickel-molybdenum alloys of different batches when the batches are used, the content difference of nickel elements provided by the nickel-molybdenum alloy raw materials is reduced, and the uniformity of the content of the nickel elements in the TA22 titanium alloy ingot is effectively controlled.
The preparation method of the TA22 titanium alloy ingot is characterized in that the pressing in the step one comprises the following specific processes: adopting an automatic weighing and material mixing device to automatically weigh and mix all the raw materials, then adding the raw materials into a die cavity of a press, and pressing the raw materials by adopting a 50MN oil press to obtain the product with the density of not less than 3.3g/cm3The electrode block of (1).
The preparation method of the TA22 titanium alloy ingot is characterized in that the current for primary smelting in the third step is 13 kA-17 kA, the current for secondary smelting is 20 kA-24 kA, and the current for product smelting is 22 kA-26 kA.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the nickel-molybdenum alloy is adopted to replace the traditional titanium-nickel alloy as a nickel element source, so that the raw material cost is saved, the raw material is directly added in a dispersing manner without shearing, the production efficiency is greatly improved, the production period is shortened, the raw material melting and uniform diffusion in the VAR smelting process are promoted by combining control of the VAR smelting process, the nickel element segregation is prevented, the high-quality TA22 titanium alloy cast ingot without metallurgical defects is prepared, and the quality of the TA22 titanium alloy cast ingot is improved.
2. According to the invention, by controlling the chemical components in the nickel-molybdenum alloy, the component proportion meets the batching requirement of the TA22 titanium alloy ingot, the content of impurity elements in the TA22 titanium alloy ingot is effectively controlled, and the quality of the TA22 titanium alloy ingot is ensured.
3. According to the invention, by limiting the shape and specification size of the nickel-molybdenum alloy, the uniformity of material distribution during subsequent electrode pressing is improved, and meanwhile, the raw materials are fully melted and uniformly diffused in the VAR smelting process, so that the TA22 titanium alloy ingot with uniformly distributed element content is obtained, and the quality of the TA22 titanium alloy ingot is further improved.
4. According to the method, through controlling the process parameters of VAR smelting, each smelting process is effectively controlled, the melting and uniform diffusion of raw materials in the VAR smelting process are promoted, the segregation of nickel elements is prevented, the TA22 titanium alloy ingot with high quality and no metallurgical defects is prepared, and the quality of the TA22 titanium alloy ingot is improved.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
FIG. 1 is a drawing of a titanium-nickel alloy wire used in the preparation of a conventional TA22 titanium alloy ingot.
FIG. 2 is a schematic representation of a nickel-molybdenum alloy used in the production of a TA22 titanium alloy ingot according to the invention.
Detailed Description
Example 1
The embodiment comprises the following steps:
firstly, according to the design components of a target product TA22 titanium alloy ingot, namely Ti-3.0Al-1.0Mo-0.55Ni-1.6Zr, adopting titanium sponge, aluminum beans, aluminum molybdenum alloy, nickel molybdenum alloy and zirconium sponge as raw materials, adopting an automatic weighing and mixing device to automatically weigh and mix all the raw materials for 90s, then adding the raw materials into a press die cavity, and adopting a 50MN oil press to press the raw materials for 10s under the pressure of 26MPa to obtain 55.6kg of single weight and the density of 3.3g/cm3The electrode block of (1);
the nickel-molybdenum alloy is NiMo30, and the nickel-molybdenum alloy comprises the following elements in percentage by mass: 27.5 percent of Mo, less than or equal to 0.10 percent of Fe, less than or equal to 0.10 percent of O, less than or equal to 0.05 percent of C, less than or equal to 0.15 percent of Si, no more than 0.10 percent of other single elements of W, Pb, Cu, Sn, Zr and Y, and the balance of nickel; the nickel-molybdenum alloy is in the shape of chips with the size width multiplied by the length multiplied by the thickness multiplied by (5-12) mmx (5-15) mmx (0.5-1) mm, as shown in figure 2, and before the nickel-molybdenum alloy is adopted, the surface of the nickel-molybdenum alloy is treated until the surface is clean, and no visible oil stain, oxidation film and other metal and non-metal inclusions exist;
step two, adopting a vacuum plasma welding box to perform assembly welding on the electrode block pressed in the step one: firstly, stacking electrode blocks according to 2 x 10 sections, fixing the electrode blocks by using a fixture to enable the electrode blocks to be tightly arranged, then pushing the electrode blocks into a vacuum plasma welding box, closing a box door, vacuumizing and adjusting the pressure rise rate, filling argon until the display value of a pressure gauge is-0.03 MPa when the vacuum degree of a furnace chamber is not more than 5Pa and the gas leakage rate is not more than 3Pa/min, stopping filling the argon, starting welding by adopting a welding current of 380A, cooling for more than 20min after the welding is finished, and discharging the electrode blocks to obtain a consumable electrode;
step three, carrying out three times of VAR smelting on the consumable electrode obtained in the step two by adopting an 8-ton vacuum consumable electric arc furnace manufactured by Germany ALD company to obtain a TA22 titanium alloy ingot; the specific process of the third VAR smelting comprises the following steps:
step 301, assembling a crucible with the size diameter multiplied by the height of 500mm multiplied by 2600mm and a bottom pad, then loading the crucible and the bottom pad into a smelting station, then loading a consumable electrode into the crucible for fixing, sealing the furnace and vacuumizing;
step 302, welding the consumable electrode and the auxiliary electrode which are vacuumized in the step 301 in a vacuum consumable arc furnace, controlling the vacuum degree before welding to be not more than 10Pa, controlling the welding current to be 2 kA-15 kA and slowly rising, obtaining a primary welding electrode after welding, cooling for more than 40min, and then discharging for inspection;
step 303, sending the primary welding electrode obtained in the step 302 into a vacuum consumable arc furnace, sealing the furnace again, vacuumizing, controlling the vacuum degree before melting to be not more than 5Pa and the gas leakage rate to be not more than 0.6Pa/min, and then sending electricity to start arcing for primary melting to obtain a primary ingot; the current of the primary smelting is 15 kA-13 kA and is gradually reduced, and the voltage is 34V;
step 304, cleaning the primary ingot obtained in the step 303 by using an ingot washing machine to remove surface volatile matters, then performing flat heading by using a lathe to remove head volatile matters and impurities until the fins are not more than 5mm, then placing the primary ingot and an auxiliary electrode in a vacuum consumable arc furnace for welding, controlling the vacuum degree before melting to be not more than 10Pa, controlling the welding current to be 2 kA-15 kA and slowly rising, obtaining a secondary welding electrode after welding, cooling for more than 60min, and then taking out of the furnace for inspection;
305, conveying the secondary welding electrode obtained in the step 304 into a vacuum consumable arc furnace, sealing the furnace again, vacuumizing, controlling the vacuum degree before melting to be not more than 5Pa and the gas leakage rate to be not more than 0.6Pa/min, and then transmitting power to start arcing for secondary melting to obtain a secondary ingot; the current of the secondary smelting is 22 kA-20 kA and is slowly reduced, and the voltage is 33V;
step 306, cleaning the secondary ingot obtained in the step 305 by using an ingot washing machine to remove surface volatile matters, then performing flat heading by using a lathe to remove head volatile matters and impurities until the flash is not more than 5mm, then placing the secondary ingot and an auxiliary electrode in a vacuum consumable arc furnace for welding, controlling the vacuum degree before melting to be not more than 10Pa, controlling the welding current to be 2 kA-15 kA and slowly rising, obtaining a third welding electrode after welding, cooling for more than 60min, and then taking out of the furnace for inspection;
307, feeding the tertiary welding electrode obtained in the step 306 into a vacuum consumable arc furnace, re-sealing the furnace, vacuumizing, controlling the vacuum degree before melting to be not more than 1.33Pa and the gas leakage rate to be not more than 0.6Pa/min, then feeding power to initiate arc for product melting, and feeding at the later stage of melting to obtain a TA22 titanium alloy ingot; the current for smelting the product is 24-22 kA and is slowly reduced, and the voltage is 33V.
Example 2
The embodiment comprises the following steps:
firstly, according to the design components of a target product TA22 titanium alloy ingot, namely Ti-3.2Al-1.1Mo-0.55Ni-1.7Zr, adopting titanium sponge, aluminum beans, aluminum molybdenum alloy, nickel molybdenum alloy and zirconium sponge as raw materials, adopting an automatic weighing and mixing device to automatically weigh and mix all the raw materials for 90s, then adding the raw materials into a press die cavity, and adopting a 50MN oil press to press the raw materials for 10s under the pressure of 26MPa to obtain the titanium alloy ingot with the single weight of 57.5kg and the density of 3.3g/cm3The electrode block of (1);
the nickel-molybdenum alloy is NiMo30, and the nickel-molybdenum alloy comprises the following elements in percentage by mass: 29.0 percent of Mo, less than or equal to 0.10 percent of Fe, less than or equal to 0.10 percent of O, less than or equal to 0.05 percent of C, less than or equal to 0.15 percent of Si, no more than 0.10 percent of other single elements of W, Pb, Cu, Sn, Zr and Y, and the balance of nickel; the nickel-molybdenum alloy is in the shape of chips with the size width multiplied by the length multiplied by the thickness multiplied by (5-12) mmx (5-15) mmx (0.5-1) mm, as shown in figure 2, and before the nickel-molybdenum alloy is adopted, the surface of the nickel-molybdenum alloy is treated until the surface is clean, and no visible oil stain, oxidation film and other metal and non-metal inclusions exist;
step two, adopting a vacuum plasma welding box to perform assembly welding on the electrode block pressed in the step one: firstly, stacking electrode blocks according to 2 x 10 sections, fixing the electrode blocks by using a fixture to enable the electrode blocks to be tightly arranged, then pushing the electrode blocks into a vacuum plasma welding box, closing a box door, vacuumizing and adjusting the pressure rise rate, filling argon until the display value of a pressure gauge is-0.03 MPa when the vacuum degree of a furnace chamber is not more than 5Pa and the gas leakage rate is not more than 3Pa/min, stopping filling the argon, starting welding by adopting a welding current of 380A, cooling for more than 20min after the welding is finished, and discharging the electrode blocks to obtain a consumable electrode;
step three, carrying out three times of VAR smelting on the consumable electrode obtained in the step two by adopting an 8-ton vacuum consumable electric arc furnace manufactured by Germany ALD company to obtain a TA22 titanium alloy ingot; the specific process of the third VAR smelting comprises the following steps:
step 301, assembling a crucible with the size diameter multiplied by the height of 500mm multiplied by 2600mm and a bottom pad, then loading the crucible and the bottom pad into a smelting station, then loading a consumable electrode into the crucible for fixing, sealing the furnace and vacuumizing;
step 302, welding the consumable electrode and the auxiliary electrode which are vacuumized in the step 301 in a vacuum consumable arc furnace, controlling the vacuum degree before welding to be not more than 10Pa, controlling the welding current to be 2 kA-15 kA and slowly rising, obtaining a primary welding electrode after welding, cooling for more than 40min, and then discharging for inspection;
step 303, sending the primary welding electrode obtained in the step 302 into a vacuum consumable arc furnace, sealing the furnace again, vacuumizing, controlling the vacuum degree before melting to be not more than 5Pa and the gas leakage rate to be not more than 0.6Pa/min, and then sending electricity to start arcing for primary melting to obtain a primary ingot; the current of the primary smelting is 17 kA-15 kA and is gradually reduced, and the voltage is 35V;
step 304, cleaning the primary ingot obtained in the step 303 by using an ingot washing machine to remove surface volatile matters, then performing flat heading by using a lathe to remove head volatile matters and impurities until the fins are not more than 5mm, then placing the primary ingot and an auxiliary electrode in a vacuum consumable arc furnace for welding, controlling the vacuum degree before melting to be not more than 10Pa, controlling the welding current to be 2 kA-15 kA and slowly rising, obtaining a secondary welding electrode after welding, cooling for more than 60min, and then taking out of the furnace for inspection;
305, conveying the secondary welding electrode obtained in the step 304 into a vacuum consumable arc furnace, sealing the furnace again, vacuumizing, controlling the vacuum degree before melting to be not more than 5Pa and the gas leakage rate to be not more than 0.6Pa/min, and then transmitting power to start arcing for secondary melting to obtain a secondary ingot; the current of the secondary smelting is 24 kA-22 kA and is slowly reduced, and the voltage is 34V;
step 306, cleaning the secondary ingot obtained in the step 305 by using an ingot washing machine to remove surface volatile matters, then performing flat heading by using a lathe to remove head volatile matters and impurities until the flash is not more than 5mm, then placing the secondary ingot and an auxiliary electrode in a vacuum consumable arc furnace for welding, controlling the vacuum degree before melting to be not more than 10Pa, controlling the welding current to be 2 kA-15 kA and slowly rising, obtaining a third welding electrode after welding, cooling for more than 60min, and then taking out of the furnace for inspection;
307, feeding the tertiary welding electrode obtained in the step 306 into a vacuum consumable arc furnace, re-sealing the furnace, vacuumizing, controlling the vacuum degree before melting to be not more than 1.33Pa and the gas leakage rate to be not more than 0.6Pa/min, then feeding power to initiate arc for product melting, and feeding at the later stage of melting to obtain a TA22 titanium alloy ingot; the current for smelting the product is 26-24 kA and is slowly reduced, and the voltage is 34V.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.

Claims (7)

1. A preparation method of a TA22 titanium alloy ingot is characterized by comprising the following steps:
according to the design components of a target product TA22 titanium alloy ingot, pressing an electrode block by using titanium sponge, aluminum beans, aluminum-molybdenum alloy, nickel-molybdenum alloy and zirconium sponge as raw materials;
step two, carrying out assembly welding on the electrode block pressed in the step one by adopting a vacuum plasma welding box to obtain a consumable electrode; the assembly welding in the step two comprises the following specific processes: fixing and closely arranging electrode block blocks by using a clamp, then pushing the electrode block blocks into a vacuum plasma welding box, closing a box door, vacuumizing, adjusting the pressure rise rate, introducing argon to start welding, and cooling and discharging the electrode block blocks after the welding is finished;
step three, performing more than three times of VAR smelting on the consumable electrode obtained in the step two by adopting a vacuum consumable electrode electric arc furnace to obtain a TA22 titanium alloy ingot; the specific process of more than three times of VAR smelting comprises the following steps:
step 301, assembling a crucible with the size diameter multiplied by the height of 500mm multiplied by 2600mm and a bottom pad, then loading the crucible and the bottom pad into a smelting station, then loading a consumable electrode into the crucible for fixing, sealing the furnace and vacuumizing;
step 302, welding the consumable electrode and the auxiliary electrode vacuumized in the step 301 in a vacuum consumable arc furnace, controlling the vacuum degree before welding to be not more than 10Pa and the welding current to be 2 kA-15 kA, obtaining a primary welding electrode after welding, cooling for more than 40min, and then taking out of the furnace for inspection;
step 303, sending the primary welding electrode obtained in the step 302 into a vacuum consumable arc furnace, sealing the furnace again, vacuumizing, controlling the vacuum degree before melting to be not more than 5Pa and the gas leakage rate to be not more than 0.6Pa/min, and then sending electricity to start arcing for primary melting to obtain a primary ingot; the voltage of the primary smelting is 34V-35V;
step 304, cleaning the primary ingot obtained in the step 303 by using an ingot cleaning machine, then performing facing to enable the fins to be not more than 5mm by using a lathe, then placing the processed ingots and an auxiliary electrode in a vacuum consumable arc furnace for welding, controlling the vacuum degree before melting to be not more than 10Pa, controlling the welding current to be 2 kA-15 kA, obtaining a secondary welding electrode after welding, cooling for more than 60min, and then taking out of the furnace for inspection;
305, conveying the secondary welding electrode obtained in the step 304 into a vacuum consumable arc furnace, sealing the furnace again, vacuumizing, controlling the vacuum degree before melting to be not more than 5Pa and the gas leakage rate to be not more than 0.6Pa/min, and then transmitting power to start arcing for secondary melting to obtain a secondary ingot; the voltage of the secondary smelting is 33V-34V;
step 306, cleaning the secondary ingot obtained in the step 305 by using an ingot cleaning machine, then performing facing to enable the fins to be not more than 5mm by using a lathe, placing the secondary ingot and an auxiliary electrode in a vacuum consumable arc furnace for welding, controlling the vacuum degree before welding to be not more than 10Pa and the welding current to be 2 kA-15 kA, obtaining a third welding electrode after welding, cooling for more than 60min, and then discharging for inspection;
307, feeding the tertiary welding electrode obtained in the step 306 into a vacuum consumable arc furnace, re-sealing the furnace, vacuumizing, controlling the vacuum degree before melting to be not more than 1.33Pa and the gas leakage rate to be not more than 0.6Pa/min, then feeding power to initiate arc for product melting, and feeding at the later stage of melting to obtain a TA22 titanium alloy ingot; the voltage for smelting the product is 33V-34V.
2. The method for preparing the TA22 titanium alloy ingot according to claim 1, wherein the grade of the nickel-molybdenum alloy in the first step is NiMo30, and the mass contents of the elements in the nickel-molybdenum alloy are as follows: 27.5 to 29.0 percent of Mo, less than or equal to 0.10 percent of Fe, less than or equal to 0.10 percent of O, less than or equal to 0.05 percent of C, less than or equal to 0.15 percent of Si, no more than 0.10 percent of other single elements of W, Pb, Cu, Sn, Zr and Y, and the balance of nickel.
3. A method of producing a TA22 titanium alloy ingot according to claim 1, wherein in step one the nickel molybdenum alloy is in the form of chips having dimensions of width x length x thickness of (5-12) mm x (5-15) mm x (0.5-1) mm.
4. A method of making a TA22 titanium alloy ingot according to claim 1, wherein in step one the nickel molybdenum alloy is surface treated to a clean surface without visible oily soil, oxide film and other metallic and non-metallic inclusions prior to pressing the electrodes.
5. The method as claimed in claim 1, wherein the difference in Mo content between different batches of Ni-Mo alloy is less than 0.5% when the Ni-Mo alloy is used as a multi-furnace raw material batch in the first step.
6. The method for preparing a TA22 titanium alloy ingot according to claim 1, wherein the pressing in the first step is specifically carried out by: adopting an automatic weighing and material mixing device to automatically weigh and mix all the raw materials, then adding the raw materials into a die cavity of a press, and pressing the raw materials by adopting a 50MN oil press to obtain the product with the density of not less than 3.3g/cm3The electrode block of (1).
7. The method for preparing the TA22 titanium alloy ingot according to claim 1, wherein the current for the primary smelting in step three is 13 kA-17 kA, the current for the secondary smelting is 20 kA-24 kA, and the current for the product smelting is 22 kA-26 kA.
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