Apparatus and method for floating zone melting of ti45xd alloy in a seamless high permeable crucible

Abstract

A device and method for floating smelting Ti45XD alloy by seamless high-permeability magnetic crucible belong to the field of electromagnetic metallurgy. For realizing the above method, a device for floating smelting Ti45XD alloy by seamless high-permeability magnetic crucible is used, the crucible material is Mn 55‑56 Cu 42‑43 (TiAl) 1‑3 ; and a gradient type magnetic induction coil matched with the crucible is configured to give the best power supply parameters. The present application adopts γ-Ti 51 Al 48 B alloy as a master alloy for alloy smelting, through three times of power increase and three times of power decrease, the oxygen content can be effectively reduced, the alloy smelting difficulty is greatly reduced, and the prepared Ti45XD alloy has the characteristics of good uniformity, no inclusion, low nitrogen, oxygen and hydrogen content and the like.

Description

Technical Field

[0001] This invention belongs to the field of electromagnetic metallurgy, and specifically relates to an apparatus and method for suspending and melting Ti45XD alloy in a seamless high-transparency magnetic crucible. Background Technology

[0002] Ti45XD alloy (Ti-45Al-2Mn-2Nb-0.8vol%TiB2) is a TiAl alloy with good high-temperature strength and fatigue performance. The addition of Mn promotes twinning deformation and improves the alloy's plasticity, while the addition of Nb improves the high-temperature performance of γ-TiAl alloys, and B has a grain-refining effect. The United States has already applied it to aircraft engine stator blades, low-pressure turbine blades, and other fields. Therefore, the independent research and development of this new material is crucial for the development of my country's aviation industry.

[0003] The current methods for melting Ti45XD alloy mainly have the following problems: 1) The raw materials TiB2 and Nb have high melting points and require extremely high power to melt. Ti is highly reactive and easily reacts chemically with the crucible. Under high power, arc discharge can also occur, which can easily damage the equipment; 2) When sponge titanium is used as a raw material, it is easy to generate endogenous inclusions TiO2, which are difficult to remove.

[0004] Currently, the main method for preparing Ti45XD alloy is water-cooled copper crucible magnetic levitation melting technology. The main problems with this method are as follows: 1) The water-cooled copper crucible has poor magnetic permeability (magnetic permeability only at the cut), which on the one hand leads to a low hump ratio and a gentle slope on the surface of the suspended melt, making it difficult to remove metal inclusions, and on the other hand, it also causes a lot of energy waste; 2) The distribution of the coils on the outside of the cylindrical copper crucible results in poor suspension of the melt, which in turn leads to a low hump ratio, making it difficult to remove metal inclusions.

[0005] CN115896501A discloses a Ti 5-7 Al 3-5 The preparation method involves firstly rolling sponge titanium and pure aluminum into electrodes, then performing vacuum arc melting to achieve preliminary alloying. To prevent significant aluminum evaporation due to the large difference in melting points and densities between titanium and aluminum, the second step employs vacuum suspension melting technology. This invention patent utilizes Chinese patent CN113957279A to synthesize pure alloyed γ-Ti using a one-step self-propagating method. 51 Al 48 Ti45XD alloy was prepared in a suspension melting furnace using B as the master alloy and a specially designed seamless high-permeability magnetic manganese-copper alloy crucible. Through a completely new design of the crucible's material and structure, as well as the coil's structure, the prepared Ti45XD alloy exhibits excellent homogeneity, is free of inclusions, and has extremely low levels of nitrogen, oxygen, and hydrogen. Summary of the Invention

[0006] To address the shortcomings of existing magnetic levitation melting technology, and to improve the magnetic permeability of the magnetic levitation melting crucible, enhance the melting effect of Ti45XD alloy, and reduce the melting cost of Ti45XD alloy, this invention improves the melting equipment and provides a device and method for seamless high-permeability magnetic crucible levitation melting of Ti45XD alloy. To improve the efficiency of alloy magnetic levitation melting and produce a purer alloy, this invention develops a copper alloy with higher magnetic permeability based on the principle of "high quantity, low element," with a permeability 18 times that of traditional pure copper. Based on this, a seamless high-permeability magnetically cooled crucible is prepared, and a matching magnetic induction coil device, water cooling system, and power supply operating parameters are designed and provided. A secondary feeding and segmented chamber system, a graphite casting system, a multi-coupler temperature measurement feedback system, and a visual remote control system are also added.

[0007] A device for seamless high-transparency magnetic crucible levitation melting of Ti45XD alloy consists of a power supply, a multi-couple temperature feedback system and a visual remote control system, a vacuum magnetic levitation melting furnace, a vacuum unit and an argon gas protection device.

[0008] The power supply, multi-couple temperature feedback system and visual remote control system, vacuum unit, argon protection device and vacuum magnetic levitation melting furnace are arranged in parallel. The power supply is electrically connected to the multi-couple temperature feedback system and visual remote control system, vacuum magnetic levitation melting furnace, vacuum unit and argon protection device through the power supply box. The visual multi-couple remote control system is electrically connected to the vacuum magnetic levitation melting furnace through the feeding system, pressurization system and alarm system. The vacuum unit is connected to the vacuum magnetic levitation melting furnace through the gas path. The argon protection device is connected to the vacuum magnetic levitation melting furnace through the gas path.

[0009] The multi-coupler temperature feedback system and the visual remote control system include a remote operating system and a multi-coupler temperature control system. The remote operating system includes a feeding system, a pressurizing system, and an alarm system. The feeding system controls the secondary feeding compartment in the vacuum magnetic levitation melting furnace, adding other elements required for melting the alloy. The pressurizing system controls the vacuum unit, creating a vacuum in the vacuum magnetic levitation melting furnace to prevent reaction with air during melting. The alarm system consists of alarms that flash or sound when preset values ​​are reached or exceeded. The multi-coupler temperature control system is located above the vacuum furnace body and uses infrared thermometry and inserted thermocouples to measure the temperature inside the furnace, including cooling water temperature, vacuum chamber temperature, alloy melt temperature, and graphite mold temperature. Pressure measuring couplers are installed inside the vacuum magnetic levitation melting furnace to monitor pressure in real time, with the relevant data directly displayed on the computer panel for data visualization.

[0010] The vacuum magnetic levitation melting furnace consists of a melting zone and a casting zone. A secondary feeding compartment is located at the top, below which is the melting zone, where a seamless, high-transparency magnetic crucible is placed. An induction coil parallel to the crucible wall is installed outside the crucible, with an outer insulating cloth between the crucible and the external coil. The furnace is connected to the wall of the vacuum magnetic levitation melting furnace via a support. A water-cooling system is installed between the inner and outer walls of the crucible, with a water-cooling pipe connected to a water-cooling cavity at the bottom of the seamless, high-transparency magnetic crucible. The water-cooling cavity is located on the crucible base and its support, with a water-cooling inlet pipe and a water-cooling outlet pipe at the bottom. The crucible base and its support are connected to the wall of the vacuum magnetic levitation melting furnace. The casting zone is located at the center of the bottom of the furnace, with a lifting structure. A centrifugal casting platform is fixed at the top, and a graphite mold is placed above the centrifugal casting platform. An infrared temperature measuring device is installed on the upper left side of the vacuum magnetic levitation melting furnace.

[0011] The seamless high-transparency magnetic crucible is a type of Mn 55-56 Cu 42-43 (TiAl) 1-3 The seamless high-permeability magnetic crucible is made of a high-permeability magnetic manganese-copper alloy, comprising the following components and mass fractions: Mn 55-56%, Cu 42-43%, γ-TiAl 1-3%; the purity of Mn, Cu, and γ-TiAl in the raw materials is greater than 99.99%.

[0012] The preparation method of the seamless high-transparency magnetic crucible includes: mixing raw materials Mn, Cu, and γ-TiAl in a certain proportion and then loading them into a graphite crucible, which is then placed in a vacuum induction furnace and evacuated to a vacuum level not exceeding 3.0 × 10⁻⁶. -3 After heating to a pressure of at least 0.045 MPa with argon gas, the raw material is completely melted. The mixture is then held at this temperature for 20-40 minutes and subjected to three melting processes to obtain a high-density alloy melt free of gas inclusions. The alloy melt is then removed and cast using a one-piece casting method to form a shape... The shape formed by rotating a parabola 360°; then mechanically processed and polished to obtain a seamless, high-transparency magnetic crucible.

[0013] The crucible is 300-320mm high, with an inner diameter of 190-200mm at its maximum, an outer diameter of 200-210mm, and a wall thickness of 8-10mm.

[0014] The crucible coil comprises 10 annular magnetic induction coils, arranged parallel to the crucible wall at intervals, and integrated into a single unit via a support assembly. These coils encircle the outer surface of the seamless high-transparency magnetic crucible and are connected to an external power source. The operating parameters of the seamless high-transparency magnetic crucible are as follows: the inner diameter of the upper surface of the largest magnetic induction coil is 210-215 mm, the inner diameter of the lower surface is 200-205 mm, the outer diameter of the upper surface is 220-225 mm, and the outer diameter of the lower surface is 210-215 mm; the inner diameter of the upper surface of the smallest magnetic induction coil is... The diameter of the coil is 80-85mm, the inner diameter of the lower surface is 58-63mm, the outer diameter of the upper surface is 90-95mm, the inner diameter of the lower surface is 68-73mm, the coil width is 20-25mm, the spacing between the upper 4 turns of the coil is 10-15mm, the spacing between the lower 6 turns of the coil is 8-10mm, and the distance between the coil and the outer wall of the crucible is 5-10mm; the power supply frequency of the magnetic induction coil is 2500-3500Hz, the current intensity is 300-360A, and the power supply power is 150-180kW.

[0015] The water-cooling system includes: a main inlet pipe, a main outlet pipe, an inlet water-cooling chamber, an outlet water-cooling chamber, a copper inlet pipe, and a copper outlet pipe. Pipes are machined between the inner and outer walls of the high-transparency magnetic crucible to serve as water-cooling pipes, symmetrically distributed between the inner and outer walls. The copper inlet pipe is inserted into the inlet water-cooling chamber, and the copper outlet pipe is inserted into the outlet water-cooling chamber. Cooling water is placed in a cylindrical box with horizontally arranged partitions; the upper layer is the outlet chamber, and the lower layer is the inlet chamber. The bottom wall of the box connects to the main inlet pipe and the main outlet pipe. During operation, under water pressure, the cooling water enters the water-cooling pipes between the inner and outer walls of the crucible through the copper inlet pipes from the inlet chamber. After circulating once within the crucible wall along the water-cooling pipes, it flows into the outlet chamber from the copper outlet pipe.

[0016] The water-cooling tube has an inlet with an inner diameter of 3-5 mm at the bottom of the crucible. 50-55 pipes with an inner diameter of 3-5 mm are machined inside the crucible wall, with a spacing of 20-25 mm between the pipes. An outlet with a diameter of 3-5 mm is also located at the bottom of the crucible. The internal pipes are 8-10 mm from the top and 8-10 mm from the bottom of the crucible. The copper pipe at the inlet is 10-15 mm long, and the copper pipe at the outlet is 3-5 mm long, inserted into the inlet and outlet chambers respectively. The water-cooling chamber is a cylinder with a bottom diameter of 152-155 mm and a height of 100-110 mm, horizontally divided into upper and lower chambers. Two pipes with an inner diameter of 25-28 mm are evenly distributed at the bottom, serving as the main inlet and outlet pipes. The outlet copper pipe is connected to the upper wall of the water-cooling chamber, and the inlet copper pipe is connected to the middle transverse wall of the water-cooling chamber, forming a complete water-cooling circulation channel.

[0017] The crucible base and its support are described. The crucible base is a rectangular platform, and its two ends are connected to the vacuum suspension induction melting furnace through screws and supports. It supports the crucible and the water cooling system, and the casting operation is completed through the rotatable support. The support enables the crucible to be raised, lowered, tilted and rotated.

[0018] The secondary feeding segmented bin is a cylindrical segmented feeding bin, which is divided into 2-4 fan-shaped bins on an even circumference. Each bin holds different alloying elements, such as manganese, niobium, and chromium. The secondary feeding segmented bin is equipped with a feeding port at the bottom, and alloying elements are added in advance as needed during the smelting process.

[0019] The graphite casting device is located in the lower chamber of the vacuum chamber, fixedly placed on a centrifugal disc, and connected to a lifting rod. Graphite molds of different shapes are placed according to casting needs, heated to the required production temperature, and then raised to the magnetic levitation melting chamber for casting via a lifting mechanism, followed by slow cooling and shaping.

[0020] A method for suspending and melting Ti45XD alloy in a seamless high-transparency magnetic crucible, using the aforementioned apparatus, includes the following steps:

[0021] Step 1: Select raw materials and determine the proportions

[0022] Prepare materials according to the molar ratio, and put the master alloy γ-Ti 51 Al 48 B is placed in a crucible, and manganese and niobium are placed into the first and second compartments of the secondary feeding compartment, respectively.

[0023] The γ-Ti 51 Al 48 B. The molar ratio of manganese and niobium is (95-96):(2-2.5):(2-2.5);

[0024] Step 2: Preparation of Ti45XD alloy

[0025] After evacuating the furnace and purging it with argon, the crucible coil parameters were set for γ-Ti. 51 Al 48 B is smelted, and then manganese and niobium are added in sequence and smelted separately. After the smelting is completed, the power is increased three times and the power is decreased three times to obtain the molten liquid.

[0026] Step 3: Casting

[0027] Set the preheating temperature of the graphite mold, stop heating the graphite mold when the set temperature is reached, flip the crucible so that the molten liquid is poured into the graphite mold by gravity through the riser and the gating system, and obtain a high-purity Ti45XD alloy ingot after slow cooling.

[0028] in:

[0029] In step 1, γ-Ti 51 Al 48 B. The purity of both manganese and niobium is ≥99.99%.

[0030] In step 2, the smelting furnace is a vacuum suspension induction smelting furnace; the vacuuming process is carried out until the pressure inside the smelting furnace does not exceed 3 × 10⁻⁶. -3 Pa, wherein the pressure of the argon gas supplied to the melting furnace is not less than 0.045 MPa.

[0031] In step 2, for γ-Ti 51 Al 48 B. Melting is carried out as follows: Set the crucible coil parameters: coil input current 300-320A, coil power 150-160kW, coil power frequency 3200-3500Hz, melting temperature 1300-1400℃. After melting for 2-3 minutes, add manganese and melt it. Set the input current 320-330A, power 160-165kW, coil power frequency 2800-3200Hz, melting temperature 1400-1500℃. After melting for 2-3 minutes, add niobium and melt it. Set the input current 330-350A, power 165-175kW, coil power frequency 2500-2800Hz, melting temperature 1500-1600℃, melting for 3-4 minutes until completely melted, and let it stand for 5-6 minutes.

[0032] In step 2, the power supply is increased to 175-180kW to form a hump on the liquid surface for 2-3 minutes, and the power supply is decreased to 160-165kW to keep the liquid surface stable for 2-3 minutes. The above steps are repeated twice. The crucible is flipped at low power so that the molten liquid is poured into the graphite mold by gravity through the riser and the gating. After slow cooling, a high-purity Ti45XD alloy ingot is obtained.

[0033] In step 2, the frequency of the crucible coil power supply for the three-stage power increase and three-stage power decrease melting is 2500-3500Hz.

[0034] In step 3, the preheating temperature of the graphite mold is 500-600℃.

[0035] In step 3, the casting method is bottom pouring, and the casting time is 6-7 seconds.

[0036] In step 3, cooling is performed by cooling in a vacuum suspension induction melting furnace for 2-3 hours and then opening the furnace door for natural cooling.

[0037] The beneficial effects of this invention are as follows:

[0038] 1. The new method for suspension melting of Ti45XD alloy provided by the present invention uses γ-TiAl alloy with an alloy composition molar ratio of Ti:Al:B = 51:48:1 as the master alloy for alloy melting, which ensures that the titanium-aluminum alloy always has uniform composition and stable structure during subsequent feeding melting, effectively reduces the oxygen content, and greatly reduces the difficulty of alloy melting.

[0039] 2. The method for suspending and melting Ti45XD alloy using a seamless high-transparency magnetic crucible provided by this invention, using γ-Ti 51 Al 48 Using B as the raw material, the smelting process employs crucible magnetic levitation smelting, which suspends the Ti45XD alloy in the furnace during smelting, preventing it from contacting the crucible wall. Under the influence of magnetic force, the alloy is continuously stirred, ensuring the material remains uncontaminated and exhibits high homogeneity. This also avoids oxidation and the formation of inclusions. The Ti45XD alloy prepared by this method is characterized by excellent homogeneity, absence of inclusions, and extremely low levels of nitrogen, oxygen, and hydrogen.

[0040] 3. The high-permeability magnetic crucible of this invention exhibits strong magnetic permeability, simple structure, and high strength. To meet the magnetic and temperature requirements for melting Ti45XD alloy, this invention provides a seamless high-permeability magnetic crucible. The magnetic permeability of its crucible material is far greater than that of traditional segmented pure copper crucibles. Segmented crucibles generate eddy currents on the segments, causing a large amount of heat to be carried away by the water cooling system, resulting in significant induced heat loss. Traditional segmented pure copper crucibles are only magnetically permeable at the seams, while this seamless high-permeability magnetic crucible is magnetically permeable throughout, with a magnetic permeability 18 times that of traditional segmented copper crucibles.

[0041] 4. This invention provides the coil position and operating parameters for melting Ti45XD alloy using this high-transparency magnetic crucible, including power frequency, current intensity, power supply, temperature, and holding time. Compared with traditional segmented copper crucibles, this high-transparency magnetic crucible exhibits better levitation effect. The required power parameters are also significantly reduced, effectively saving costs.

[0042] 5. The device provided by the present invention adopts a single-channel strong water cooling system with a simple circuit design, which can effectively reduce the eddy current heat loss caused by cooling water. By increasing the water cooling area, it can make up for the deficiency of insufficient thermal conductivity of high-permeability magnetic materials, avoid damage to the crucible caused by excessive local temperature, and avoid safety accidents.

[0043] 6. This invention achieves quantitative addition of manganese and niobium during the Ti45XD alloy smelting process through a two-stage feeding compartment. By controlling the alloy quality and smelting sequence during the titanium-aluminum alloy smelting process, a Ti45XD alloy melt with uniform composition and stable structure is obtained, avoiding repeated vacuum extraction operations. The operation is simple and effectively saves production time and costs.

[0044] 7. The heatable graphite casting device of the present invention sets the casting method, mold shape, and mold temperature according to the production needs of Ti45XD. The graphite mold is preheated according to the casting superheat, allowing the high-temperature molten metal to cool slowly within the high-temperature mold, avoiding the problem of melt segregation caused by excessive temperature difference between the mold and the high-temperature molten metal. The bottom-pouring method is used for casting, giving sufficient time for slag formation and bubble rise, avoiding the problem of a large number of bubbles inside the cast body caused by argon protection. Attached Figure Description

[0045] Figure 1 Diagram of a device for suspending and melting Ti45XD alloy in a seamless, high-transparency magnetic crucible;

[0046] Among them, 1: power supply; 2: multi-coupler temperature feedback system and visual remote control system; 3: infrared temperature measurement device; 4: secondary feeding compartment; 5: seamless high-permeability magnetic Cu. 41-43 Mn 55-57 Ti 1～3 Al 1～3 6: Crucible; 7: Crucible base and its support; 8: External induction coil heating device for graphite mold; 9: Centrifugal casting platform; 10: Heated graphite mold; 11: Lifting structure; 12: Water cooling chamber; 13: External insulating cloth for crucible; 14: Main water inlet pipe; 15: Main water outlet pipe; 16: Vacuum magnetic levitation melting furnace; 17: Vacuum unit; 18: Argon protection device; 19: Crucible coil.

[0047] Figure 2 A front view of a seamless, high-transparency magnetic crucible;

[0048] Figure 3 This is a partial cross-sectional view of the crucible wall;

[0049] Among them, 11-1 is the water inlet cooling chamber, 11-2 is the water outlet cooling chamber, 13 is the main water inlet pipe, and 14 is the main water outlet pipe.

[0050] 19: Water cooling pipe; 20: Copper inlet pipe; 21: Copper outlet pipe. Detailed Implementation

[0051] The present invention will be further described in detail below with reference to the embodiments:

[0052] Example 1

[0053] A device for seamless high-transparency magnetic crucible suspension melting of Ti45XD alloy, such as... Figure 1 As shown, it consists of a power supply, a multi-couple temperature feedback system and a visual remote control system, a vacuum magnetic levitation melting furnace, a vacuum unit and an argon gas protection device.

[0054] The power supply, multi-couple temperature measurement feedback system and visual remote control system, vacuum unit, argon protection device and vacuum magnetic levitation melting furnace are arranged in parallel. The power supply is electrically connected to the multi-couple temperature measurement feedback system and visual remote control system, vacuum magnetic levitation melting furnace, vacuum unit and argon protection device through the power supply box. The multi-couple temperature measurement feedback system and visual remote control system are electrically connected to the vacuum magnetic levitation melting furnace through their feeding system, pressurization system and alarm system. The vacuum unit is connected to the vacuum magnetic levitation melting furnace through the gas path. The argon protection device is connected to the vacuum magnetic levitation melting furnace through the gas path.

[0055] The system includes a multi-coupler temperature feedback system and a visual remote control system. The remote control system comprises a feeding system, a pressurization system, and an alarm system. The feeding system controls the secondary feeding compartments in the vacuum magnetic levitation melting furnace, adding other elements to the molten alloy. The pressurization system controls the vacuum unit, creating a vacuum in the furnace to prevent reactions with air during melting. The alarm system consists of alarms that flash or sound when preset values ​​are reached or exceeded. The multi-coupler temperature control system, located above the furnace body, primarily uses infrared and inserted thermocouples to measure the internal temperatures of the furnace, including cooling water, vacuum chamber, molten alloy, and graphite mold. Pressure gauges are installed inside the furnace to monitor pressure in real time, with the data displayed directly on a computer panel for data visualization.

[0056] The vacuum magnetic levitation melting furnace consists of a melting zone and a casting zone. A secondary feeding compartment is located at the top, below which is the melting zone, where a seamless, high-transparency magnetic crucible is placed. An induction coil parallel to the crucible wall is installed outside the crucible, with an insulating cloth between the crucible and the magnetic induction coil. The crucible is connected to the furnace wall via a support. A water-cooling system is added to the seamless, high-transparency magnetic crucible, with water-cooling pipes connected to a water-cooling cavity at the bottom of the crucible body. The water-cooling cavity is located on the crucible base and its support, with water-cooling inlet and outlet pipes at the bottom. The crucible base and its support are connected to the furnace wall. The casting zone is located at the center of the furnace bottom, with a lifting structure. A centrifugal casting platform is fixed at the top, and a graphite mold is placed above the platform. An infrared temperature measuring device is located on the upper left side of the furnace exterior.

[0057] in:

[0058] Seamless high-transparency magnetic crucible, its specific structure and water-cooled cross-sectional view are as follows: Figure 2 , 3 As shown, the material is a high-transmittance magnetic manganese-copper alloy Mn. 55 Cu 43(TiAl)₂ comprises the following components and mass fractions: Mn 55%, Cu 43%, and γ-TiAl 2%. The γ-TiAl is a γ-TiAl alloy synthesized via a one-step self-propagating method as described in Chinese patent CN113957279A. The raw materials are mixed and placed in a crucible, then placed in a vacuum induction furnace and evacuated to a vacuum level of 3.0 × 10⁻⁶. -3 After purging with argon gas at 0.045 MPa, the mixture was heated until all the raw materials were melted. After holding at this temperature for 30 minutes, it underwent three melting processes to obtain a high-density alloy melt free of gas inclusions. The alloy melt was then removed and cast using a one-piece casting method to form a shape... The shape formed by rotating the parabola 360° is then machined and polished to obtain a seamless high-transparency magnetic crucible. The crucible is 300mm high, with a maximum inner diameter of 190mm, an outer diameter of 200mm, and a wall thickness of 10mm.

[0059] The crucible coil, consisting of 10 turns, is wound parallel to the crucible wall around its exterior. It is integrated into a single unit via a support assembly, encircling the outer circumference of the seamless high-transparency magnetic crucible and connected to an external power source. The operating parameters of the seamless high-transparency magnetic crucible are as follows: electromagnetic induction coil power frequency of 3000Hz, coil current intensity of 360A, and power supply power of 180kW; the maximum magnetic induction coil has an upper surface inner diameter of 210mm, a lower surface inner diameter of 200mm, an upper surface outer diameter of 220mm, and a lower surface outer diameter of 210mm; the minimum magnetic induction coil has an upper surface inner diameter of 80mm, a lower surface inner diameter of 58mm, an upper surface outer diameter of 90mm, and a lower surface inner diameter of 68mm; the coil width is 20mm; the spacing between the top 4 turns of the coil is 10mm; the spacing between the bottom 6 turns of the coil is 8mm; and the distance between the coil and the outer wall of the crucible is 8mm.

[0060] The water-cooling system includes: a main inlet pipe, a main outlet pipe, an inlet water-cooling cavity, an outlet water-cooling cavity, a copper inlet pipe, and a copper outlet pipe. Pipes are machined between the inner and outer walls of a high-transparency magnetic crucible to serve as water-cooling pipes, symmetrically distributed between the inner and outer walls. The copper inlet pipe is inserted into the inlet water-cooling cavity, and the copper outlet pipe is inserted into the outlet water-cooling cavity. Cooling water is placed in a cylindrical box with horizontally arranged partitions; the upper layer is the outlet cavity, and the lower layer is the inlet cavity. The bottom wall of the box connects to the main inlet pipe and the main outlet pipe. During operation, under water pressure, the cooling water enters the water-cooling pipes between the inner and outer walls of the crucible through the copper inlet pipes from the inlet cavity. After circulating once within the crucible wall along the water-cooling pipes, it flows into the outlet cavity from the copper outlet pipe.

[0061] The water-cooling system consists of a 4mm inner diameter inlet at the bottom of the crucible and 52 3mm inner diameter pipes machined into the crucible wall, spaced 22mm apart. A 4mm outlet is located at the bottom of the crucible, with its internal pipes 10mm from both the top and bottom. The copper pipes at the inlet and outlet are 12mm and 5mm long, respectively, and are inserted into the inlet and outlet chambers. The water-cooling chamber is a cylinder with a bottom diameter of 152mm and a height of 100mm, divided into upper and lower chambers horizontally. Two 26mm inner diameter pipes are evenly distributed at the bottom, serving as the main inlet and outlet pipes. The outlet copper pipe is connected to the upper wall of the water-cooling chamber, while the inlet copper pipe is connected to the middle horizontal wall, forming a complete water-cooling circulation channel.

[0062] The crucible base and support are rectangular platforms connected to the vacuum furnace body at both ends by screws and supports. They provide support for the crucible and the water cooling system. After the alloy melt is melted, the crucible can be rotated and raised and lowered by the rotatable support to complete the casting.

[0063] The secondary feeding compartment is a cylindrical, segmented feeding bin, divided into three equal chambers along its circumference. Each chamber holds a different alloying element, such as pure niobium, pure manganese, or pure chromium. A feeding port is located at the bottom of the secondary feeding compartment, allowing alloying elements to be added in advance as needed during the smelting process.

[0064] The graphite casting device is located in the lower chamber of the vacuum chamber, fixedly placed on a centrifugal disc, and connected to a lifting rod. Graphite molds of different shapes are placed according to casting requirements, heated to the necessary production temperature, and then raised to the magnetic levitation melting chamber via a lifting mechanism for casting, followed by slow cooling and solidification.

[0065] Example 2

[0066] A seamless, high-transparency magnetic crucible suspension melting device for Ti45XD alloy is provided. It has the same dimensions and structure as Example 1, but the crucible material parameters are modified to be: Mn 56%, Cu 43%, γ-TiAl 1%.

[0067] By comparing Examples 1 and 2, it can be seen that the crucible in Example 2 has better magnetic permeability and levitation effect.

[0068] Example 3

[0069] In this embodiment of the invention, γ-Ti synthesized by one-step self-propagating method using Chinese patent CN113957279A is selected. 51 Al 48 Alloy B is the master alloy.

[0070] A method for suspending and melting Ti45XD alloy in a seamless high-transparency magnetic crucible, the specific steps of which are as follows:

[0071] Step 1: Select raw materials and determine the proportions

[0072] molar ratio: γ-Ti 51 Al 48 B: Pure manganese: pure niobium = 95.2:2.4:2.4 was used for raw material preparation. The raw material mass was: γ-Ti 51 Al 48 B: 3575g, pure manganese: 132g, pure niobium: 224g, γ-Ti was added to a high-permeability magnetic crucible. 51 Al 48 B. Place pure manganese in the first compartment of the secondary feeding compartment and pure niobium in the second compartment.

[0073] Step 2: Preparation of Ti45XD alloy

[0074] The smelting furnace was evacuated to a vacuum level of 3×10. -3 Pa, then purged with argon to 0.045 MPa, set the crucible coil parameters: coil input current 300 A, coil power 150 kW, coil power frequency 3200 Hz, melting temperature reached 1300 ℃, after melting for 3 min, added manganese for melting, set input current 320 A, power 160 kW, coil power frequency 2800 Hz, melting temperature reached 1400 ℃, after melting for 3 min, added niobium for melting, set input current 330 A, power 165 kW, coil power frequency 2500 Hz, melting temperature reached 1500 ℃, after melting for 3 min until completely melted, let stand for 5 min.

[0075] After the alloy melt has been melted, the power supply is increased to 175kW to form a hump on the liquid surface for 3 minutes, and then the power supply is decreased to 160kW to keep the liquid surface stable for 3 minutes. The above steps are repeated twice. Under low power, the crucible is flipped so that the melt is poured into the graphite mold by gravity through the riser and the gating. After slow cooling, a high-purity Ti45XD alloy ingot is obtained.

[0076] Step 3: Casting

[0077] The graphite mold preheating temperature was set to 500℃. Heating was stopped upon reaching the set temperature, and the mold was lifted to the casting area via a lifting system. Bottom-pouring casting was used, with a casting time of 6 seconds. After casting, the mold was cooled for 2 hours in a vacuum levitation induction melting furnace, and then allowed to cool naturally after the furnace door was opened. The final product was a Ti-45.6Al-2.2Mn-2.2Nb-0.7vol%TiB2 alloy ingot.

[0078] Example 4

[0079] A method for suspending and melting Ti45XD alloy in a seamless high-transparency magnetic crucible, the specific steps of which are as follows:

[0080] Step 1: Select raw materials and determine the proportions

[0081] molar ratio: γ-Ti 51 Al 48 B: Pure manganese: pure niobium = 95.6:2.2:2.2 was used for raw material preparation. The raw material mass was: γ-Ti 51 Al 48 B: 3590g, pure manganese: 121g, pure niobium: 205g, γ-Ti is added in a high-permeability magnetic crucible. 51 Al 48 B. Place pure manganese in the first compartment of the secondary feeding compartment and pure niobium in the second compartment.

[0082] Step 2: Preparation of Ti45XD alloy

[0083] The smelting furnace was evacuated to a vacuum level of 3×10. -3 Pa, then purged with argon to 0.045 MPa, set the crucible coil parameters: coil input current 300 A, coil power 150 kW, coil power frequency 3200 Hz, melting temperature reached 1300 ℃, after melting for 3 min, added manganese for melting, set input current 320 A, power 160 kW, coil power frequency 2800 Hz, melting temperature reached 1400 ℃, after melting for 3 min, added niobium for melting, set input current 330 A, power 165 kW, coil power frequency 2500 Hz, melting temperature reached 1500 ℃, after melting for 3 min until completely melted, let stand for 5 min.

[0084] After the alloy melt has been melted, the power supply is increased to 175kW to form a hump on the liquid surface for 3 minutes, and then the power supply is decreased to 160kW to keep the liquid surface stable for 3 minutes. The above steps are repeated twice. Under low power, the crucible is flipped so that the melt is poured into the graphite mold by gravity through the riser and the gating. After slow cooling, a high-purity Ti45XD alloy ingot is obtained.

[0085] Step 3: Casting

[0086] The graphite mold preheating temperature was set to 500℃. Heating was stopped upon reaching the set temperature, and the mold was lifted to the casting area via a lifting system. Bottom-pouring casting was used, with a casting time of 6 seconds. After casting, the mold was cooled for 2 hours in a vacuum levitation induction melting furnace, and then allowed to cool naturally after the furnace door was opened. The final product was a Ti-45.2Al-2.1Mn-2.1Nb-0.8vol%TiB2 alloy ingot.

[0087] Example 5

[0088] A method for suspending and melting Ti45XD alloy in a seamless high-transparency magnetic crucible, the specific steps of which are as follows:

[0089] Step 1: Select raw materials and determine the proportions

[0090] molar ratio: γ-Ti 51 Al 48 B: Pure manganese: pure niobium = 96:2:2 was used for material preparation. The raw material mass was: γ-Ti 51 Al 48 B: 3605g, pure manganese: 110g, pure niobium: 186g, γ-Ti was added to a high-permeability magnetic crucible. 51 Al 48 B. Place pure manganese in the first compartment of the secondary feeding compartment and pure niobium in the second compartment.

[0091] Step 2: Preparation of Ti45XD alloy

[0092] The smelting furnace was evacuated to a vacuum level of 3×10. -3 Pa, then purged with argon to 0.045 MPa, set the crucible coil parameters: coil input current 300 A, coil power 150 kW, coil power frequency 3200 Hz, melting temperature reached 1300 ℃, after melting for 3 min, added manganese for melting, set input current 320 A, power 160 kW, coil power frequency 2800 Hz, melting temperature reached 1400 ℃, after melting for 3 min, added niobium for melting, set input current 330 A, power 165 kW, coil power frequency 2500 Hz, melting temperature reached 1500 ℃, after melting for 3 min until completely melted, let stand for 5 min.

[0093] After the alloy melt has been melted, the power supply is increased to 175kW to form a hump on the liquid surface for 3 minutes, and then the power supply is decreased to 160kW to keep the liquid surface stable for 3 minutes. The above steps are repeated twice. Under low power, the crucible is flipped so that the melt is poured into the graphite mold by gravity through the riser and the gating. After slow cooling, a high-purity Ti45XD alloy ingot is obtained.

[0094] Step 3: Casting

[0095] The graphite mold preheating temperature was set to 500℃. Heating was stopped upon reaching the set temperature, and the mold was lifted to the casting area via a lifting system. Bottom-pouring casting was used, with a casting time of 6 seconds. After casting, the mold was cooled for 2 hours in a vacuum levitation induction melting furnace, followed by natural cooling with the furnace door opened. The final product was a Ti-46Al-1.8Mn-1.8Nb-1.0vol%TiB2 alloy ingot.

[0096] By comparing Examples 3-5, it can be seen that the alloy obtained in Example 4 best matches the target alloy Ti45XD alloy.

[0097] Example 6

[0098] A method for suspending and melting Ti45XD alloy in a seamless high-transparency magnetic crucible, the specific steps of which are as follows:

[0099] Step 1: Select raw materials and determine the proportions

[0100] molar ratio: γ-Ti 51 Al 48 B: Pure manganese: pure niobium = 95.6:2.2:2.2 was used for raw material preparation. The raw material mass was: γ-Ti 51 Al 48 B: 3590g, pure manganese: 121g, pure niobium: 205g, γ-Ti is added in a high-permeability magnetic crucible. 51 Al 48 B. Place pure manganese in the first compartment of the secondary feeding compartment and pure niobium in the second compartment.

[0101] Step 2: Preparation of Ti45XD alloy

[0102] The smelting furnace was evacuated to a vacuum level of 3×10. -3 Pa, then purged with argon to 0.045 MPa, set the crucible coil parameters: coil input current 305 A, coil power 152 kW, coil power frequency 3250 Hz, melting temperature reached 1300 ℃, after melting for 3 min, added manganese for melting, set input current 322 A, power 161 kW, coil power frequency 2900 Hz, melting temperature reached 1400 ℃, after melting for 3 min, added niobium for melting, set input current 335 A, power 168 kW, coil power frequency 2600 Hz, melting temperature reached 1500 ℃, after melting for 3 min until completely melted, let stand for 5 min.

[0103] After the alloy melt has been melted, the power supply is increased to 175kW to form a hump on the liquid surface for 3 minutes, and then the power supply is decreased to 160kW to keep the liquid surface stable for 3 minutes. The above steps are repeated twice. Under low power, the crucible is flipped so that the melt is poured into the graphite mold by gravity through the riser and the gating. After slow cooling, a high-purity Ti45XD alloy ingot is obtained.

[0104] Step 3: Casting

[0105] The graphite mold preheating temperature was set to 500℃. Heating was stopped upon reaching the set temperature, and the mold was lifted to the casting area via a lifting system. Bottom-pouring casting was used, with a casting time of 6 seconds. After casting, the mold was cooled for 2 hours in a vacuum levitation induction melting furnace, followed by natural cooling with the furnace door opened. The final product was a Ti45XD alloy ingot conforming to alloy standards.

[0106] Example 7

[0107] A method for suspending and melting Ti45XD alloy in a seamless high-transparency magnetic crucible, the specific steps of which are as follows:

[0108] Step 1: Select raw materials and determine the proportions

[0109] molar ratio: γ-Ti 51 Al 48 B: Pure manganese: pure niobium = 95.6:2.2:2.2 was used for raw material preparation. The raw material mass was: γ-Ti 51 Al 48 B: 3590g, pure manganese: 121g, pure niobium: 205g, γ-Ti is added in a high-permeability magnetic crucible. 51 Al 48 B. Place pure manganese in the first compartment of the secondary feeding compartment and pure niobium in the second compartment.

[0110] Step 2: Preparation of Ti45XD alloy

[0111] The smelting furnace was evacuated to a vacuum level of 3×10. -3 Pa, then purged with argon to 0.045 MPa, set the crucible coil parameters: coil input current 310 A, coil power 155 kW, coil power frequency 3400 Hz, melting temperature reached 1400 ℃, after melting for 3 min, added manganese for melting, set input current 325 A, power 163 kW, coil power frequency 3000 Hz, melting temperature reached 1500 ℃, after melting for 3 min, added niobium for melting, set input current 345 A, power 173 kW, coil power frequency 2700 Hz, melting temperature reached 1600 ℃, after melting for 3 min until completely melted, let stand for 5 min.

[0112] After the alloy melt has been melted, the power supply is increased to 175kW to form a hump on the liquid surface for 3 minutes, and then the power supply is decreased to 165kW to keep the liquid surface stable for 3 minutes. The above steps are repeated twice. Under low power, the crucible is flipped so that the melt flows along the riser and through the gating system into the graphite mold by gravity. After slow cooling, a high-purity Ti45XD alloy ingot is obtained.

[0113] Step 3: Casting

[0114] The graphite mold preheating temperature was set to 580℃. Heating was stopped upon reaching the set temperature, and the mold was lifted to the casting area via a lifting system. Bottom-pouring casting was used, with a casting time of 7 seconds. After casting, the mold was cooled for 2 hours in a vacuum levitation induction melting furnace, followed by natural cooling with the furnace door opened. The final product was a Ti45XD alloy ingot conforming to alloy standards.

[0115] Example 8

[0116] A method for suspending and melting Ti45XD alloy in a seamless high-transparency magnetic crucible, the specific steps of which are as follows:

[0117] Step 1: Select raw materials and determine the proportions

[0118] molar ratio: γ-Ti 51 Al 48 B: Pure manganese: pure niobium = 95.6:2.2:2.2 was used for raw material preparation. The raw material mass was: γ-Ti 51 Al 48 B: 3590g, pure manganese: 121g, pure niobium: 205g, γ-Ti is added in a high-permeability magnetic crucible. 51 Al 48 B. Place pure manganese in the first compartment of the secondary feeding compartment and pure niobium in the second compartment.

[0119] Step 2: Preparation of Ti45XD alloy

[0120] The smelting furnace was evacuated to a vacuum level of 3×10. -3 Pa, then purged with argon to 0.045 MPa, set the crucible coil parameters: coil input current 320 A, coil power 160 kW, coil power frequency 3200 Hz, melting temperature reached 1300 ℃, after melting for 3 min, added manganese for melting, set input current 330 A, power 165 kW, coil power frequency 2800 Hz, melting temperature reached 1400 ℃, after melting for 3 min, added niobium for melting, set input current 350 A, power 175 kW, coil power frequency 2500 Hz, melting temperature reached 1500 ℃, after melting for 3 min until completely melted, let stand for 5 min.

[0121] After the alloy melt has been melted, the power supply is increased to 175kW to form a hump on the liquid surface for 3 minutes, and then the power supply is decreased to 160kW to keep the liquid surface stable for 3 minutes. The above steps are repeated twice. Under low power, the crucible is flipped so that the melt is poured into the graphite mold by gravity through the riser and the gating. After slow cooling, a high-purity Ti45XD alloy ingot is obtained.

[0122] Step 3: Casting

[0123] The graphite mold preheating temperature was set to 500℃. Heating was stopped upon reaching the set temperature, and the mold was lifted to the casting area via a lifting system. Bottom-pouring casting was used, with a casting time of 6 seconds. After casting, the mold was cooled for 2 hours in a vacuum levitation induction melting furnace, followed by natural cooling with the furnace door opened. The final product was a Ti45XD alloy ingot conforming to alloy standards.

[0124] Comparing the Ti45XD alloys obtained in Examples 6-8, it was found that the Ti45XD alloy obtained under the power supply parameters in Example 8 had a more uniform composition.

[0125] Comparative Example 1

[0126] To demonstrate the practicality of this invention, a comparative experiment was conducted on the slurry melting of Ti45XD alloy using a traditional slit copper crucible and the seamless high-permeability magnetic crucible of this invention.

[0127] The selected copper crucible is made of oxygen-free pure copper. The size, shape, and coil size and arrangement are the same as in Example 2. 24 slits are evenly cut on the crucible wall. The alloy melting method of Example 4 is used. The hump ratio of the alloy melt in a traditional slit copper crucible is 1:1, while the hump ratio of the alloy melt in a high-permeability copper-manganese crucible is 3:1. It can be seen that the high-permeability manganese copper crucible of the present invention has stronger magnetic permeability, resulting in fewer inclusions in the alloy.

[0128] Comparative Example 2

[0129] To demonstrate the practicality of this invention, a comparative experiment was conducted on the suspension melting of Ti45XD alloy using two seamless high-permeability magnetic manganese copper crucibles with different power supplies.

[0130] Using the apparatus of Example 2, with the same raw material ratio as Example 4 and the power parameters of Example 8, and comparing it with Example 6, it can be seen that there is no difference in the Ti45XD alloy melted under the two power levels. The alloy has fewer inclusions and lower oxygen content. Therefore, it can be concluded that the crucible of the present invention is more energy-efficient in achieving the same melting effect.

[0131] Comparative Example 3

[0132] To demonstrate the practicality of this invention, a comparative experiment was conducted on the suspension melting of Ti45XD alloy using two seamless high-permeability magnetic manganese copper crucibles with different crucible shapes.

[0133] One type is a traditional cylindrical crucible, and the other is the crucible described in Example 2. Using the alloy smelting method of Example 4, the peak-to-peak ratio of the alloy melt smelted in the traditional cylindrical crucible is 1:1, while the peak-to-peak ratio of the alloy melt smelted in this invention is 3:1. This demonstrates that the high-permeability manganese-copper crucible of this invention has stronger magnetic permeability and better levitation force, resulting in fewer inclusions in the alloy.

[0134] Comparative Example 4

[0135] To demonstrate the practicality of this invention, a comparative experiment was conducted on the suspension melting of Ti45XD alloy with different raw materials in two seamless high-permeability magnetic manganese copper crucibles.

[0136] One method uses a molar ratio of sponge titanium:Al:Mn:Nb:TiB2 of 50:45:2:2:1 for alloy smelting. Another method is the smelting method shown in Example 4. During the smelting process, due to the high activity of sponge titanium, it is very easy to react with the crucible, which can easily cause arc discharge and is highly dangerous. Sponge titanium is also very easy to react with oxygen, and the oxygen content of the alloy obtained by smelting is much higher than that of the alloy obtained by smelting in this invention.

[0137] The above description is merely the basic principle of the invention patent and does not constitute any limitation on the invention. Any equivalent changes and modifications made to it based on the invention are within the scope of the patent's technical protection scheme.

Claims

1. A device for seamless high-transparency magnetic crucible levitation melting of Ti45XD alloy, characterized in that, It mainly consists of a power supply, a multi-couple temperature measurement feedback system, a visual remote control system, a vacuum magnetic levitation melting furnace, a vacuum unit, and an argon gas protection device. The power supply, multi-couple temperature feedback system, visual remote control system, vacuum unit, argon protection device, and vacuum magnetic levitation melting furnace are arranged in parallel. The power supply is electrically connected to the multi-couple temperature feedback system, visual remote control system, vacuum magnetic levitation melting furnace, vacuum unit, and argon protection device through a power supply box. The visual multi-couple remote control system is electrically connected to the vacuum magnetic levitation melting furnace through a feeding system, pressurization system, and alarm system. The vacuum unit is connected to the vacuum magnetic levitation melting furnace through a gas path, and the argon protection device is connected to the vacuum magnetic levitation melting furnace through a gas path. The vacuum magnetic levitation melting furnace consists of a melting zone and a casting zone, with Mn placed in the melting zone. 55-56 Cu 42-43 (TiAl) 1-3 A seamless, high-transparency magnetic crucible is provided, with an induction coil installed on the outside of the crucible. It is connected to the wall of a vacuum magnetic levitation melting furnace via a support. A water cooling system is installed between the inner and outer walls of the crucible, and a graphite mold is placed in the casting area. The Ti45XD alloy is specifically Ti-45Al-2Mn-2Nb-0.8vol%TiB2; The high-permeability magnetic alloy components and their mass percentages in the crucible are as follows: Mn 55-56%, Cu 42-43%, γ-TiAl 1-3%; and the crucible shape is h= r 2 The shape of a parabola rotated 360°; The crucible is 300-320 mm high, with an inner diameter of 190-200 mm at its maximum point, an outer diameter of 200-210 mm, and a wall thickness of 8-10 mm. The high-transparency magnetic alloy components in the crucible all have a purity greater than 99.99%. A gradient-type magnetic induction coil matching its shape is installed on the outside of the crucible. The 10-turn coil is parallel to the crucible wall and surrounds the outside of the crucible. The inner diameter of the upper surface of the largest magnetic induction coil is 210-215 mm, the inner diameter of the lower surface is 200-205 mm, the outer diameter of the upper surface is 220-225 mm, and the outer diameter of the lower surface is 210-215 mm. The inner diameter of the upper surface of the smallest magnetic induction coil is 80-85 mm, the inner diameter of the lower surface is 58-63 mm, the outer diameter of the upper surface is 90-95 mm, and the outer diameter of the lower surface is 68-73 mm. The coil width is 20-25 mm. The spacing between the upper 4 turns of the coil is 10-15 mm, the spacing between the lower 6 turns of the coil is 8-10 mm, and the distance between the coil and the outer wall of the crucible is 5-10 mm. The gradient magnetic induction coil has a power supply frequency of 2500-3500 Hz, a current intensity of 300-360 A, and a power of 150-180 kW.

2. A method for suspending and melting Ti45XD alloy in a seamless high-transparency magnetic crucible, characterized in that, The apparatus for smelting Ti45XD alloy using the seamless high-transparency magnetic crucible suspension melting method described in claim 1 includes the following steps: Step 1: Select raw materials and determine the proportions Prepare materials according to the molar ratio, and use the master alloy γ-Ti 51 Al 48 B is placed in a crucible, and manganese and niobium are placed into the first and second compartments of the secondary feeding compartment, respectively. The γ-Ti 51 Al 48 B. The molar ratio of manganese and niobium is (95-96):(2-2.5):(2-2.5); Step 2: Preparation of Ti45XD alloy After evacuating the furnace and purging it with argon, the parameters of the gradient magnetic induction coil outside the crucible are set. First, the γ-Ti... 51 Al 48 B is smelted, and then manganese and niobium are added in sequence and smelted separately. After the smelting is completed, the power is increased three times and the power is decreased three times to obtain the molten liquid. Step 3: Casting Set the preheating temperature of the graphite mold, stop heating the graphite mold when the set temperature is reached, flip the crucible so that the molten liquid is poured into the graphite mold by gravity through the riser and the gating system, and obtain a high-purity Ti45XD alloy ingot after slow cooling.

3. The method for suspending and melting Ti45XD alloy in a seamless high-transparency magnetic crucible according to claim 2, characterized in that, In step 2, the smelting furnace is a vacuum suspension induction smelting furnace, and the furnace is evacuated until the pressure inside does not exceed 3 × 10⁻⁶. -3 Pa, the pressure inside the argon furnace shall not be less than 0.045 MPa; Setting the parameters of the external gradient magnetic induction coil for γ-Ti 51 Al 48 When B is being smelted, the coil input current is 300-320 A, the coil power is 150-160 kW, the coil power frequency is 3200-3500 Hz, and the smelting temperature reaches 1300-1400 ℃. After 2-3 minutes of smelting, manganese is added for further smelting. The coil input current is then set to 320-330 A, the coil power is 160-165 kW, the coil power frequency is 2800-3200 Hz, and the smelting temperature reaches 1400-1500 ℃. After 2-3 minutes of smelting, niobium is added for further smelting. The coil input current is set to 330-350 A, the coil power is 165-175 kW, the coil power frequency is 2500-2800 Hz, and the smelting temperature reaches 1500-1600 ℃. After 3-4 minutes of smelting until completely melted, the mixture is allowed to stand for 5-6 minutes.

4. The method for suspending and melting Ti45XD alloy in a seamless high-transparency magnetic crucible according to claim 2, characterized in that, In step 2, the power of the molten alloy is increased to 175-180 kW to form a hump on the liquid surface for 2-3 minutes, and then the power is decreased to 160-165 kW to keep the liquid surface stable for 2-3 minutes. This step is repeated twice. Then, in step 3, the crucible is flipped at low power so that the molten liquid is poured into the graphite mold by gravity through the riser and the gating system. After slow cooling, a high-purity Ti45XD alloy ingot is obtained.

5. The method for suspending and melting Ti45XD alloy in a seamless high-transparency magnetic crucible according to claim 2, characterized in that, In step 2, the frequency of the external gradient magnetic induction coil power supply for the crucible in the three-stage power increase and three-stage power decrease melting process is 2500-3500 Hz.

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