CN113957278B - Preparation method of TA22 titanium alloy ingot - Google Patents
Preparation method of TA22 titanium alloy ingot Download PDFInfo
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- CN113957278B CN113957278B CN202111260203.0A CN202111260203A CN113957278B CN 113957278 B CN113957278 B CN 113957278B CN 202111260203 A CN202111260203 A CN 202111260203A CN 113957278 B CN113957278 B CN 113957278B
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Abstract
The invention discloses a preparation method of a TA22 titanium alloy ingot, which comprises the following steps: 1. 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; 2. assembling and welding the electrode blocks to obtain a consumable electrode; 3. and carrying out 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
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 Ti 31) titanium alloy is Ti-3Al-1Mo-1Ni-1Zr, at present, 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 the TA22 cast ingot has the following defects: (1) The titanium-nickel alloy is a finished wire product, is expensive, has the unit price of about 800 yuan/kg (fluctuates 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 the TA22 cast ingot 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 above-mentioned deficiencies 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 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, adopting a vacuum plasma welding box to carry out assembly welding on the electrode block pressed in the step one 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 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 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 voltage of the primary smelting is 34-35V;
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 casting obtained in the step 305 by using an ingot cleaning machine, performing flat facing by using a lathe until the flash is not more than 5mm, placing the secondary ingot casting and the 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 tertiary 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, sealing the furnace again, 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 transmitting power to initiate arc to melt products, and feeding at the later stage of melting to obtain TA22 titanium alloy ingots; 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, after being pressed into an electrode block, the raw materials are assembled and welded, and VAR smelting is carried out to prepare the TA22 titanium alloy ingot, and 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, so that the raw material cost is saved (the 5000 yuan/ton of product is reduced), and the raw materials are directly added in a dispersing manner without being sheared and processed, 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 more than three times of VAR smelting, the voltage and arc stabilizing stirring parameters of primary smelting, secondary smelting and finished product smelting are respectively controlled, a proper smelting speed is kept during the primary smelting, 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 a consumable electrode in assembly welding are prevented, a proper molten pool temperature is maintained during the secondary smelting, the melting of high-melting-point impurities and the diffusion of alloy elements are promoted to be uniform, a shallow molten pool depth and a proper temperature gradient are maintained during the finished product smelting, nickel elements are prevented, the molten pool is properly stirred to refine grains, and an ingot with good cast-state grain form and distribution, no metallurgical defects such as gas holes and inclusion in the interior and good surface quality is 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 ingot is further prevented; according to the invention, through controlling the technological 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 casting with high quality and without metallurgical defects is prepared, and the quality of the TA22 titanium alloy ingot casting is improved.
The preparation method of the TA22 titanium alloy ingot is characterized in that in the step one, 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 grade 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 the surface of the nickel-molybdenum alloy is treated to be clean before the electrode is pressed in the first step, and no visible oil stain, oxidation film and other metal and nonmetal inclusions exist. The invention 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 for batch production, 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 the nickel element provided by the nickel-molybdenum alloy raw material is reduced, and the uniformity of the nickel element content 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 low densityAt 3.3g/cm 3 The electrode block of (1).
The preparation method of the TA22 titanium alloy ingot is characterized in that in the third step, the current for primary smelting 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 nickel-molybdenum alloy is directly added in a dispersing manner without shearing processing, the production efficiency is greatly improved, the production period is shortened, the VAR smelting process is controlled, the melting and uniform diffusion of the raw materials in the VAR smelting process are promoted, the nickel element segregation is prevented, the TA22 titanium alloy cast ingot with high quality and 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 of the nickel-molybdenum alloy 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 schematic diagram of a titanium-nickel alloy wire used in the conventional TA22 titanium alloy ingot production.
FIG. 2 is a diagram of a Ni-Mo alloy ingot for TA22 Ti alloy ingot production according to the present 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 sponge titanium, aluminum beans, aluminum molybdenum alloy, nickel molybdenum alloy and sponge zirconium 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, pressing the raw materials for 10s under the pressure of 26MPa by adopting a 50MN oil press to obtain 55.6kg of single weight and the density of 3.3g/cm 3 The electrode block of (1);
the grade of 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 scraps with the size of width multiplied by length multiplied by thickness multiplied by (5-12) mmx (5-15) mmx (0.5-1) mm, as shown in figure 2, and the nickel-molybdenum alloy is subjected to surface treatment before the adoption 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, adopting a German ALD company to manufacture 8 tons of vacuum consumable electrode electric arc furnace to carry out three times of VAR smelting on the consumable electrode obtained in the step two, and obtaining 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 flash is not more than 5mm, then placing the 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, controlling the welding current to be 2 kA-15 kA, slowly raising, obtaining a secondary welding electrode after welding, cooling for more than 60min, and then discharging 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 cleaning machine to remove surface volatile matters, then performing flat heading by using a lathe to remove head-falling volatile matters and impurities until the flash is not more than 5mm, 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, controlling the welding current to be 2 kA-15 kA, slowly raising, 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, sealing the furnace again, 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 transmitting power to initiate arc to melt products, and feeding at the later stage of melting to obtain TA22 titanium alloy ingots; 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 Ti-3.2Al-1.1Mo-0.55Ni-1.7Zr of a target product TA22 titanium alloy ingot, adopting sponge titanium, aluminum beans, aluminum molybdenum alloy, nickel molybdenum alloy and sponge zirconium 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 die cavity of a press, pressing the raw materials for 10s under the pressure of 26MPa by adopting a 50MN oil press to obtain a single weight of 57.5kg and a density of 3.3g/cm 3 The 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 scraps with the size of width multiplied by length multiplied by thickness multiplied by (5-12) mmx (5-15) mmx (0.5-1) mm, as shown in figure 2, and the nickel-molybdenum alloy is subjected to surface treatment before the adoption 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 multiplied by 10 sections, fixing the electrode blocks by a clamp 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 taking out the electrode 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, sealing the furnace again, 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 transmitting 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 modifications, alterations 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 (4)
1. A preparation method of a TA22 titanium alloy ingot is characterized by comprising the following steps:
according to 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; the nickel-molybdenum alloy is NiMo30, and the nickel-molybdenum alloy comprises the following elements in percentage by mass: 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; 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;
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, sealing the furnace again, 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 transmitting power to initiate arc to melt products, and feeding at the later stage of melting to obtain TA22 titanium alloy ingots; the voltage for smelting the product is 33V-34V;
the current of the primary smelting is 13-17 kA and gradually decreases, the current of the secondary smelting is 20-24 kA and slowly decreases, and the current of the product smelting is 22-26 kA and slowly decreases.
2. The method of claim 1, wherein in step one, the surface of the nickel molybdenum alloy is treated to be clean without visible oil stains, oxide films and other metallic and non-metallic inclusions before pressing the electrode.
3. The method according to claim 1, wherein in the first step, when the nickel-molybdenum alloy is used as a multi-furnace raw material batch, the mass content difference of Mo in different batches of nickel-molybdenum alloy is less than 0.5%.
4. The method for preparing the TA22 titanium alloy ingot according to claim 1, wherein the step one, the pressing specifically comprises the following steps: 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 not less than 3.3g/cm 3 The electrode block of (1).
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