High-frequency induction heating double-coil coupling rotation regulation smelting equipment and method for processing multi-component alloy

Abstract

The invention discloses high-frequency induction heating double-coil coupling rotation regulation smelting equipment and method for treating multi-component alloy, and relates to the technical field of multi-component metal and metal-based composite materials. The invention aims to solve the problems of coarse structure and serious element segregation in the prior art. Current excitation magnetic fields with different intensities are respectively introduced into two groups of high-frequency induction coils; the water-cooling copper crucible is cooled in an upper water-cooling manner and is positioned in the furnace body; the rotatable base is connected to the motor through the lower portion of the connecting rod, the motor is installed in the rack assembly, the connecting rod upwards penetrates through the furnace body and then stretches into the water-cooling copper crucible, the water-cooling copper crucible is sleeved with the two sets of induction coils, and induction melting is matched with rotary treatment to effectively regulate and control the alloy solidification process, improve the alloy structure and improve the alloy performance. The induction coil is used for heating, so that the problems of overhigh heating speed and difficulty in temperature gradient control caused by heating by an electric arc melting method are avoided. The method is used for preparation of multi-component metal alloying.

Description

Technical Field

[0001] The present invention relates to a high-frequency induction heating solidification device and method, belonging to the technical field of the preparation of multi-component metal alloying. Specifically, it relates to an equipment and method for high-frequency induction heating double-coil coupling rotation regulation smelting for processing multi-component alloys. Background Art

[0002] High-temperature structural alloys, such as TiAl-based and NbSi-based high-temperature alloys, are widely used in fields such as aerospace, energy, and chemical engineering. Their main characteristics include excellent high-temperature strength, good oxidation resistance, and thermal stability. These alloys usually contain elements such as nickel, cobalt, and iron, and by adding alloying elements such as aluminum, titanium, chromium, etc., strengthening phases are formed to improve the mechanical properties of the alloy. In addition, high-temperature structural alloys also have good creep resistance and fatigue life, and can work stably for a long time in extreme environments, thus meeting the requirements of high-performance equipment.

[0003] Currently, ingot metallurgy is the most economical production method for preparing large-size NbSi-based alloys in industrial production. However, in the smelting process of multi-component high-temperature alloys, there are some main problems, such as coarse microstructure and composition segregation. Among them, the main reasons for the coarse microstructure are: (1) Uneven solidification rate: In traditional smelting (such as arc melting), the heating speed is too fast, resulting in a large temperature gradient in the melt. In some areas, rapid solidification forms coarse grains, while in other areas, the cooling is slower, and there is a significant difference in grain size. (2) Lack of dynamic regulation: A single heating method (such as single-coil induction or arc) cannot accurately control the temperature distribution of the molten pool, resulting in local overheating or undercooling, and a significant difference in grain size. (3) No mechanical / electromagnetic stirring: The traditional arc melting method lacks effective means for controlling the melt flow (such as rotation or electromagnetic stirring). The solute diffusion in the melt is insufficient, the grain growth direction is random, and a coarse and uneven microstructure is formed. Composition segregation will lead to uneven alloy composition and affect its mechanical properties. These problems will significantly damage the performance of the alloy and make it difficult to meet the requirements of high-performance applications.

[0004] In summary, in the traditional arc melting or vacuum induction melting process of existing NbSi-based alloys, the cooling rate is relatively slow (about 1 - 10 K / s), which easily causes the silicide phase to precipitate in the form of coarse dendrites or lamellar structures, and even form a continuous network (such as the NbSi dendrite arm spacing can reach dozens of micrometers), exacerbating brittleness. And the solidification segregation of alloying elements (such as Si, Ti, Hf, etc.) will cause excessive precipitation of the silicide phase in local areas, forming a composition non-uniform area, which becomes a crack-sensitive source. All these reasons lead to problems such as coarse microstructure and serious element segregation after adding a large amount of alloying elements. Summary of the Invention

[0005] The object of the present invention is to solve the problems that the room-temperature plasticity of existing NbSi-based alloys is poor, and after adding a large amount of alloying elements, there are problems of coarse microstructure and serious element segregation. Furthermore, an apparatus and method for high-frequency induction heating double-coil coupled rotation regulation melting of multi-component alloys are provided.

[0006] The technical solution of the present invention is: An apparatus for high-frequency induction heating double-coil coupled rotation regulation melting of multi-component alloys includes an induction coil power supply, an induction coil, a pressure gauge, a furnace body, a rotating base, a support rod, a transition rod weldment, a support rod, a rotating motor, a connecting wire, a control cabinet, a bench component, and a water-cooled copper crucible body; the water-cooled copper crucible body is installed inside the furnace body, and the water-cooled copper crucible body is cooled by the upper water-cooling method; the bench component is installed on the lower end surface of the furnace body through the support rod, the upper part of the rotating base is installed at the lower end of the water-cooled copper crucible body, the lower part of the rotating base is connected to the support rod, the upper part of the support rod extends upward into the water-cooled copper crucible body, the induction coil is sleeved on the water-cooled copper crucible body, and the induction coil is connected to the induction coil power supply located outside the furnace body, the pressure gauge is installed on the upper end surface of the furnace body through a gauge seat; the middle part of the support rod passes downward through the furnace body and the bench component and extends into the bench component, and the transition rod weldment is sleeved on the support rod between the furnace body and the bench component; the lower part of the support rod is connected to the output shaft of the rotating motor inside the bench component, and the rotating motor is connected to the control cabinet through a connecting wire; the induction coil includes an inner layer coil and an outer layer coil, and the inner layer coil and the outer layer coil are double-sleeved on the outside of the water-cooled copper crucible body from the inside to the outside.

[0007] Furthermore, it further includes a water-cooling system, and the water-cooling system includes a water inlet pipe, a water outlet pipe, a water inlet pipe plug board, and a water outlet pipe plug board. The water inlet pipe plug board and the water outlet pipe plug board are both installed on the inner side wall of the furnace body, one ends of the water inlet pipe and the water outlet pipe are respectively connected to the water inlet pipe plug board and the water outlet pipe plug board, and the other ends of the water inlet pipe and the water outlet pipe are connected to the water-cooled copper crucible body.

[0008] Furthermore, the water-cooling system further includes a water inlet interface and a water outlet interface, and the other ends of the water inlet pipe and the water outlet pipe are respectively connected to the water-cooled copper crucible body through the water inlet interface and the water outlet interface.

[0009] Even further, the water-cooling system further includes an induction coil water inlet pipe and an induction coil water outlet pipe. One ends of the induction coil water inlet pipe and the induction coil water outlet pipe are connected to the water inlet pipe plug board and the water outlet pipe plug board, and the other ends of the induction coil water inlet pipe and the induction coil water outlet pipe are connected to the outer layer coil.

[0010] Furthermore, the bottom of the rotating base and the water-cooled copper crucible body is welded to the inner water tank wall of the copper crucible of the water-cooled copper crucible body by welding.

[0011] Furthermore, the support rod is fixedly connected or hermetically connected to the lower end face of the water-cooled copper crucible body.

[0012] Furthermore, the bottom of the induction coil is located at a position 3-5 cm above the bottom of the water-cooled copper crucible body.

[0013] Furthermore, it further includes an upper observation window, an upper observation window gland, a front observation window and a front observation window gland. The front observation window is opened on the side end face of the furnace body, the front observation window gland is press-fitted on the front observation window, the upper observation window is opened on the upper end face of the furnace body, and the upper observation window gland is press-fitted on the upper observation window.

[0014] The present invention also provides a melting method for a device using high-frequency induction heating double-coil coupling rotation regulation melting for processing multi-component alloys, which includes the following steps: Step 1: Place the prepared superalloy raw materials in the water-cooled copper crucible body and close the furnace door of the furnace body; Step 2: Open the external circulating water cooling device and observe whether there is water leakage inside the furnace body through the front observation window; Step 3: Open the air valve, perform a vacuum pumping operation on the furnace body, and observe the reading of the pressure gauge. When the air pressure in the furnace reaches , close the air valve, open the argon valve, and introduce argon into the furnace body, and charge 0.05 MPa of argon into it; Step 4: Turn off the external power switch and the power switch of the control panel; Step 5: Set the rotation speeds of the rotating motor and the support rod through the control cabinet. The rotation speed range of the support rod is 1200-2000 r. Heat the raw materials by the induction coil through the control of the control panel. The adjustable range of the heating time of the induction coil is 4-10 min. Adjust the inner layer coil of the induction coil, and the adjustable range of its heating power is 30-60 kW. Then press the start heating button to start the entire device to heat and melt the raw materials. When there are still 50 s left before the induction heating time, press the start button of the outer layer coil, and the adjustable range of its heating power is 10-30 kW. Apply the action of double-layer coil coupling bottom rotation when the alloy is in a superheated state; Step 6: When applying the action of inner and outer layer coil coupling during the melting process, observe the stable running state of the rotation and solidification of the multi-component alloy in the furnace through the upper observation window, and confirm that the liquid level of the solidifying alloy ingot is relatively stable through the observation window above the furnace body; Step 7: Repeat the operations of steps 5 and 6 to rotate and remelt the ingot 5-10 times to ensure uniform composition of the alloy. If the experiment requires heat treatment, after setting the heating parameters during the last heating and melting process, perform the insulation operation. The insulation time is set to 3-5 minutes, and the insulation power of the induction coil is adjusted to 5-15kW. At this point, the preparation of the multi-component high-temperature alloy is completed.

[0015] Preferably, the high-temperature alloy raw material in step 1 is Nb-16Si-22Ti high-temperature alloy.

[0016] Compared with the prior art, the present invention has the following effects: 1. The present invention utilizes a rotary controlled melting process comprising a water-cooled copper crucible, a rotating base 9, support rods 10, a rotating motor 13, connecting wires 14, and a control cabinet 15 to effectively control the alloy solidification process, improve the alloy structure, and significantly enhance alloy properties. This invention utilizes dual induction coil heating, avoiding arc melting methods that can result in excessive heating rates and large, difficult-to-control temperature gradients, which can hinder the control of the microstructure of multi-component high-temperature alloys.

[0017] 2. The rotary controlled smelting process of the present invention, that is, the rotating base 9 and the bottom of the water-cooled copper crucible body 19 are completely welded to the water tank wall inside the copper crucible by welding, which can reduce the attenuation of the rotation effect on the alloy molten pool; in addition, the support rod 10 generates friction and vibration with the bracket assembly 16 due to rotation, and long-term wear is not conducive to the stability of the equipment, so adding a transition rod weldment 11 between the support rod 10 and the bracket assembly 16 is also conducive to the smooth operation of the equipment.

[0018] 3. The present invention combines dual sets of induction heating coils with rotary controlled melting. The convection effect of rotary controlled melting and the temperature gradient control of induction heating solve the major problems of coarse structure and element segregation that appear in multi-component high-temperature alloys after melting, especially after alloying, thereby improving the mechanical properties of the alloy at high temperature and room temperature.

[0019] 4. This invention utilizes an outer induction coil during the application of rotational control, typically during the final melting process. This allows observation through an observation window above the furnace without opening the furnace door or evacuating the furnace. This allows for repeated melting of an ingot, allowing the combined effects of rotation and dual-coil induction heating to be applied to every part of the solidified molten pool, resulting in a more uniform alloy composition.

[0020] 5. The main purpose of the method of the present invention is to replace arc heating with double-group electromagnetic induction heating. Although the heating temperature is high during arc heating, due to its too fast heating speed, a large temperature gradient will be generated, and the position and movement mode of the arc will determine the movement mode of the metal fluid. While using the double-group electromagnetic induction heating method, the temperature gradient of the alloy will be smaller, the thermal efficiency will be higher, the environment will be protected, and energy will be saved. Moreover, the coupling effect of the double-group induction coils can regulate the electromagnetic stirring effect of the magnetic field, which will cause the alloy raw materials to produce a periodic movement of small-range stable and regular up-and-down tumbling, making it easier to regulate the tissue composition of the alloy, making the composition and structure of the alloy more uniform, and the induction heating can accurately control the holding time, etc.

[0021] 6. At the upper part of the water-cooled copper crucible of the method of the present invention, a water inlet and a water outlet are provided. Compared with the water-cooled copper crucible of the current equipment, the purpose of setting the water inlet and water outlet at the lower part and the water outlet and water inlet at the upper part is to enable the cooling water to fill the entire inside of the crucible, ensuring that each part around the ingot can be cooled by the cooling water. Compared with the prior art where cooling is carried out at the bottom of the water-cooled copper crucible, the problem that the water inlet pipe and the water outlet pipe occupy the volume of the cooling water in the water-cooled copper crucible is reduced, thereby weakening the water-cooling effect of the water-cooled copper crucible.

[0022] Brief Description of the Drawings Figure 1 is a schematic diagram of the device of the present invention.

[0023] Figure 2 is a partial enlarged view of the device for rotational control melting, the water-cooled copper crucible, and the electromagnetic induction coil.

[0024] Figure 3 is a scanning electron microscope picture taken at 500 times of the NbSi superalloy made by the solidification device without applying rotational control melting and double-group induction heating to show the microstructure of the alloy.

[0025] Figure 4 is a scanning electron microscope picture taken at 500 times of the NbSi superalloy made by the device of high-frequency induction heating double-group coil coupling rotational control melting at the same position as Figure 3 to show the microstructure of the alloy.

[0026] Figure 5 is a comparative analysis of the fracture toughness of the NbSi superalloy without applying rotational control melting and double-group induction heating and after 150 s of application.

[0027] 1. Induction coil power supply; 101. Induction coil; 102. Inner layer coil; 103. Outer layer coil; 2. Front observation window gland; 3. Front observation window; 4. Upper observation window gland; 5. Upper observation window; 6. Pressure gauge; 7. Furnace body; 8. Material; 9. Rotating base; 10. Support rod; 11. Transition rod weldment; 12. Support rod; 13. Rotating motor; 14. Connecting wire; 15. Control cabinet; 16. Bench assembly; 17. Water outlet interface; 18. Water inlet interface; 19. Water-cooled copper crucible body; 20. Water outlet pipe; 21. Water outlet pipe plug-in board; 22. Induction coil water outlet pipe; 23. Water inlet pipe; 24. Water inlet pipe plug-in board; 25. Induction coil water inlet pipe; 26. Waterproof rubber ring; 27. Crucible assembly. Detailed implementation mode

[0028] Detailed implementation mode one: Combined with Figures 1 to 2 Describe this implementation mode. This implementation mode includes an induction coil power supply 1, an induction coil 101, a pressure gauge 6, a furnace body 7, a rotating base 9, a support rod 10, a transition rod weldment 11, a support rod 12, a rotating motor 13, a connecting wire 14, a control cabinet 15, a bench assembly 16 and a water-cooled copper crucible body 19; The water-cooled copper crucible body 19 is installed inside the furnace body 7, and the water-cooled copper crucible body 19 is cooled by the upper water-cooling method; the bench assembly 16 is installed on the lower end surface of the furnace body 7 through the support rod 12. The upper part of the rotating base 9 is installed at the lower end of the water-cooled copper crucible body 19. The lower part of the rotating base 9 is connected to the support rod 10. The upper part of the support rod 10 extends upward into the water-cooled copper crucible body 19. The induction coil 101 is sleeved on the water-cooled copper crucible body 19, and the induction coil 101 is connected to the induction coil power supply 1 located outside the furnace body 7. The pressure gauge 6 is installed on the upper end surface of the furnace body 7 through a gauge base; The middle part of the support rod 10 passes through the furnace body 7 and the bench assembly 16 downward and extends into the bench assembly 16. The transition rod weldment 11 is sleeved on the support rod 10 between the furnace body 7 and the bench assembly 16; the lower part of the support rod 10 is connected to the output shaft of the rotating motor 13 inside the bench assembly 16. The rotating motor 13 is connected to the control cabinet 15 through the connecting wire 14; The induction coil 101 includes an inner layer coil 102 and an outer layer coil 103. The inner layer coil 102 and the outer layer coil 103 are sleeved on the outside of the water-cooled copper crucible body 19 in a double-layer manner from the inside to the outside.

[0029] In this implementation mode, the upper part of the support rod 10 is an inverted trapezoidal groove. The inverted trapezoidal groove contains the material 8. The lower end of the inverted trapezoidal groove is the rotating base 9. The rotating base 9 is connected to the lower end surface of the water-cooled copper crucible body 19. The rotating base 9 is connected to the rotating motor 13 through the support rod 10. The rotating motor is connected to the control cabinet 15 through the connecting wire 14 for speed regulation.

[0030] In this embodiment, the induction coil 101 is used to heat the raw material 8 through the control panel. The rotation speed range of the rotating base 9, which refers to the device for rotating and regulating smelting, is 1200 - 2000 r. The adjustable range of the heating time of the induction coil 101 is 4 - 10 min. The adjustable range of the heating power of the inner coil 102 of the induction coil 101 is 30 - 60 kW, and the adjustable range of the heating power of the outer coil 103 is 10 - 30 kW, and all are continuously adjustable.

[0031] In the present invention, by combining the use of a double - group induction heating coil with rotational regulation smelting, through the convective action of rotational regulation smelting and the regulation of the induction heating temperature gradient, major problems such as coarse grain structure and element segregation that occur after the smelting of multi - component superalloys, especially after alloying, are solved, so as to improve the mechanical properties of the alloy at high and room temperatures. The room - temperature fracture toughness has been greatly improved. The fracture toughness of the NbSi alloy made by the original solidification device without rotational regulation smelting and double - group induction heating is 6.5 MPa·m 1 / 2 , after the action of the high - frequency induction heating double - group coil - coupled rotational regulation smelting device for 150 s, the fracture toughness of the alloy has increased by approximately 90%, reaching 15.2 MPa·m 1 / 2 . Experimental data prove that the action of the high - frequency induction heating double - group coil - coupled rotational regulation smelting device can effectively improve the fracture toughness of the alloy.

[0032] The water - cooled copper crucible is heated by double - group electromagnetic induction to replace arc heating. Although the heating temperature is high during arc heating, due to its too fast heating speed, a large temperature gradient will be generated, and the position and movement mode of the arc will determine the movement mode of the metal fluid. While adopting the double - group electromagnetic induction heating method, the temperature gradient of the alloy will be smaller, the thermal efficiency will be higher, it can protect the environment and save energy. Moreover, the coupled action of the double - group induction coils can regulate the electromagnetic stirring effect of the magnetic field, which will cause the alloy raw materials to produce a small - range, stable, regular, periodic up - and - down tumbling movement, making it easier to regulate the tissue composition of the alloy, making the composition and structure of the alloy more uniform, and the induction heating can accurately control the holding time, etc.

[0033] In this embodiment, the dielectric material selected is a water - cooled copper crucible that does not react with the superalloy at high temperatures. The size of the water - cooled copper crucible can be processed in multiple crucible sizes according to the volume of the material.

[0034] Specific Embodiment 2: Combine Figures 1 to 2Describing this embodiment, this embodiment further includes a water cooling system. The water cooling system includes a water inlet pipe 23, a water outlet pipe 20, a water inlet pipe insertion plate 24, and a water outlet pipe insertion plate 21. Both the water inlet pipe insertion plate 24 and the water outlet pipe insertion plate 21 are installed on the inner side wall of the furnace body 7. One end of the water inlet pipe 23 and the water outlet pipe 20 are respectively connected to the water inlet pipe insertion plate 24 and the water outlet pipe insertion plate 21, and the other ends of the water inlet pipe 23 and the water outlet pipe 20 are connected to the water-cooled copper crucible body 19.

[0035] With such a setting, it is convenient to ensure that there is always circulating cold water in the water cooling grooves of the water-cooled copper crucible. Since the water inlet and outlet are located at the upper part of the water-cooled copper crucible, the cold water will always fill the water-cooled copper crucible, which is convenient for water-cooling the crucible. The other components and connection relationships are the same as those in the first specific embodiment.

[0036] This embodiment is convenient for connecting to an external cooling water circulation system. At the same time, it can prevent the influence of high temperature on the water inlet pipe and the water outlet pipe during the heating of the alloy.

[0037] Specific embodiment three: Combining Figures 1 to 2 Describing this embodiment, the water cooling system of this embodiment further includes a water inlet interface 18 and a water outlet interface 17. The other ends of the water inlet pipe 23 and the water outlet pipe 20 are respectively connected to the water-cooled copper crucible body 19 through the water inlet interface 18 and the water outlet interface 17.

[0038] With such a setting, the connection is more reliable. The other components and connection relationships are the same as those in the first or second specific embodiment.

[0039] Specific embodiment four: Combining Figures 1 to 2 Describing this embodiment, the water cooling system of this embodiment further includes an induction coil water inlet pipe 25 and an induction coil water outlet pipe 22. One end of the induction coil water inlet pipe 25 and the induction coil water outlet pipe 22 is connected to the water inlet pipe insertion plate 24 and the water outlet pipe insertion plate 21, and the other ends of the induction coil water inlet pipe 25 and the induction coil water outlet pipe 22 are connected to the outer coil 103. With such a setting, it is convenient to cool the induction coil because the high-temperature alloy needs to be melted, so the temperature of the induction coil is high. The other components and connection relationships are the same as those in the first, second, or third specific embodiment.

[0040] The inner coil 102 and the outer coil 103 of this embodiment are high-frequency electromagnetic induction coils. Cooling water grooves are provided inside the high-frequency electromagnetic induction coils and are respectively connected to the coil water inlet pipe 25 and the coil water outlet pipe 22, and penetrate and are fixed on the water inlet connection plate 24 and the water outlet connection plate 21 respectively. The water inlet pipe and the water outlet pipe are respectively fixed on the water inlet and outlet connection plates, so that the lines of the water inlet and outlet pipes are not chaotic and are convenient for arrangement. The purpose of passing cooling water through the high-frequency electromagnetic induction coil is to cool the electromagnetic induction coil and prevent the induction coil from overheating.

[0041] Specific Embodiment 5: In combination with Figures 1 to 2 Describe this embodiment. The bottom of the rotating base 9 and the water-cooled copper crucible body 19 in this embodiment are welded to the inner water tank wall of the purple copper crucible of the water-cooled copper crucible body 19.

[0042] With such a setting, the attenuation of the rotating action acting on the alloy molten pool can be reduced; in addition, the rotating support rod 10 generates frictional vibration due to rotation and the support assembly 16, and long-term wear is not conducive to the stability of the equipment. Therefore, adding a transition rod weldment 11 between the support rod 10 and the support assembly 16 is also beneficial to the stable operation of the equipment. Waterproof rubber gaskets 26 are padded above and below the position where the neck of the rotating base 9 passes through the crucible assembly 27 to prevent water leakage. Other compositions and connection relationships are the same as those in Specific Embodiments 1, 2, 3, or 4.

[0043] Specific Embodiment 6: In combination with Figures 1 to 2 Describe this embodiment. The support rod 10 in this embodiment is fixedly connected or hermetically connected to the lower end face of the water-cooled copper crucible body 19.

[0044] With such a setting, the connection is reliable. Other compositions and connection relationships are the same as those in Specific Embodiments 1, 2, 3, 4, or 5.

[0045] Specific Embodiment 7: In combination with Figures 1 to 2 Describe this embodiment. The bottom of the induction coil 101 in this embodiment is located at a position 3 - 5 cm above the bottom of the water-cooled copper crucible body 19.

[0046] With such a setting, it is ensured that sufficient-intensity eddy currents can be generated in the superalloy ingot, thereby melting the metal ingot. Moreover, water channels are provided inside the inner coil 102 and the outer coil 103 to prevent excessive Joule heat generated by the high-frequency induction coil from damaging the high-frequency induction coil. The induction coil water inlet pipe 23 is connected to the induction coil and fixedly passes through the water inlet pipe plug-in board 24. The induction coil water outlet pipe 22 is also connected to the induction coil and fixedly passes through the water outlet pipe plug-in board 21. The plug-in boards are all fixed on the box body shell. The purpose of this is to separate the water inlet system from the water outlet system so that they do not affect each other and the cooling water effect reaches the best. Other compositions and connection relationships are the same as those in Specific Embodiments 1, 2, 3, 4, 5, or 6.

[0047] Specific Embodiment 8: In combination with Figures 1 to 2 Describe this embodiment. This embodiment further includes an upper observation window 5, an upper observation window gland 4, a front observation window 3, and a front observation window gland 2. The front observation window 3 is opened on the side end face of the furnace body 7, and the front observation window gland 2 is pressed on the front observation window 3. The upper observation window 5 is opened on the upper end face of the furnace body 7, and the upper observation window gland 4 is pressed on the upper observation window 5.

[0048] With such a setting, it is convenient to observe the situation inside the furnace at any time. Other components and connection relationships are the same as those in the first, second, third, fourth, fifth, sixth, or seventh specific embodiments.

[0049] Specific Embodiment Nine: Combining Figures 1 to 5 To illustrate this embodiment, the melting method of this embodiment includes the following steps: Step 1: Place the prepared superalloy raw materials in the water-cooled copper crucible body 19 and close the furnace door of the furnace body 7; Step 2: Turn on the external circulating water cooling device and observe through the front observation window 3 whether there is water leakage inside the furnace body; Step 3: Open the air valve, perform a vacuum pumping operation on the furnace body 7, and observe the reading of the pressure gauge 6. When the air pressure inside the furnace reaches ..., close the air valve, open the argon valve, and introduce argon into the furnace body, filling it with argon at 0.05 MPa; Step 4: Turn off the external power switch and the power switch of the control panel; Step 5: Set the rotation speeds of the rotating motor 13 and the support rod 12 through the control cabinet 15. The rotation speed range of the support rod 12 is 1200 - 2000 r. Realize the heating of the raw materials by the induction coil 101 through the control of the control panel. The adjustable range of the heating time of the induction coil 101 is 4 - 10 min. Adjust the inner layer coil 102 of the induction coil 101, and the adjustable range of its heating power is 30 - 60 kW. Then press the start heating button to start the entire device and heat and melt the raw materials. When there are still 50 s left until the induction heating time, press the start button of the outer layer coil 103, and the adjustable range of its heating power is 10 - 30 kW. Apply the coupled action of the double-layer coil and bottom rotation when the alloy is in a superheated state; Step 6: When applying the coupled action of the inner and outer layer coils during the melting process, observe the stable operation state of the rotation and solidification of the multi-component alloy inside the furnace through the upper observation window 5, and confirm that the liquid level of the alloy ingot during solidification is relatively stable through the observation window 5 above the furnace body 7; Step 7: Repeat the operations of Step 5 and Step 6 to make the ingot rotate and remelt 5 - 10 times repeatedly, thereby ensuring uniform composition everywhere in the alloy. If heat treatment operations are required according to experimental requirements, during the last heating and melting process, after setting the heating parameters, perform a heat preservation operation. The heat preservation time is set to 3 - 5 min, and the heat preservation power of the induction coil 101 is adjusted to 5 - 15 kW. Thus, the preparation of the multi-component superalloy is completed.

[0050] Specific Embodiment Ten: The superalloy raw material in Step 1 of this embodiment is Nb-16Si-22Ti superalloy.

[0051] With such a setting, in this embodiment, by applying the power of a double-group induction coil with different rotation speeds, different times, and different frequencies during the melting and solidification processes of the alloy, it is convenient to study the effects of different rotation speeds, different times, and different frequency coupling on the solidification process and morphological structure of the alloy ingot. The other compositions and connection relationships are the same as those in the first, second, third, fourth, fifth, sixth, seventh, eighth, or ninth specific embodiments.

[0052] The alloy system of this embodiment covers superalloys, and the alloy composition of the specific example cited in this example is the Nb-16Si-22Ti superalloy.

[0053] Specific Embodiment Eleven: Combining Figure 1 To illustrate this embodiment, the crucible body 19, the water inlet joint 18, and the water outlet joint 17 are all made of T2 copper material.

[0054] In the present invention, by combining a double-group induction heating coil with rotational control melting, through the convective action of rotational control melting and the regulation of the induction heating temperature gradient, major problems such as coarse grain structure and element segregation that occur after the melting of multi-component superalloys, especially after alloying, are solved, thereby improving the mechanical properties of the alloy at high and room temperatures. And in the existing equipment, when applying rotational control melting, usually in the process of melting the final charge, the function of the outer induction coil is applied, and research and application are carried out on this basis. It is necessary to observe through the observation window above the furnace body, and observations can be made without opening the furnace door and evacuating the vacuum. And one ingot can be remelted multiple times, so that the rotation combined with the double-group coil induction heating acts on each part of the molten pool during solidification. This makes the composition of the alloy more uniform. By using double-group electromagnetic induction heating to replace arc heating, although the heating temperature is high during arc heating, due to its too fast heating speed, a large temperature gradient will be generated, and the position and movement mode of the arc will determine the movement mode of the metal fluid. While using the double-group electromagnetic induction heating method, the temperature gradient of the alloy will be smaller, and the thermal efficiency is higher, protecting the environment and saving energy. Moreover, the coupling effect of the double-group induction coil can regulate the electromagnetic stirring effect of the magnetic field, which will cause the alloy raw materials to produce a small-range, stable, regular, periodic up-and-down tumbling movement, making it easier to regulate the tissue composition of the alloy, making the composition and structure of the alloy more uniform, and the induction heating can accurately control the holding time, etc.

[0055] Combining Figure 3 、 Figure 4 、 Figure 5Description: The invention effect display of this embodiment shows the microstructure of the Nb-16Si-22Ti superalloy produced by the solidification device without applying rotational control melting and double-group induction heating. The results show that its microstructure has relatively large and coarse grains, and the gray phase is distributed in large block-shaped islands. Whether it is the niobium-based solid solution phase, Nb3Si phase or γ-Nb5Si3 phase, the grains are relatively large and coarse, with serious element segregation, uneven grain size and uneven position distribution. When using the microstructure of the Nb-16Si-22Ti superalloy produced by the high-frequency induction heating double-group coil coupling rotational control melting device, the grains of the superalloy are significantly finer equiaxed grains than those of the superalloy not produced by using it. Moreover, whether it is the niobium-based solid solution phase, Nb3Si phase or γ-Nb5Si3 phase, the grains are finer and more evenly distributed. This is due to the convective effect of rotational control melting and the induction heating temperature gradient control. The grains are evenly and finely distributed, achieving the effect of fine grain strengthening, which improves the fracture toughness by about 90%.

[0056] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those skilled in the art can also make other changes within the spirit of the present invention and apply them to fields not mentioned in the present invention. Of course, these changes made according to the spirit of the present invention should be included within the scope claimed by the present invention.

Claims

1. An apparatus for high-frequency induction heating double-coil coupled rotation regulation melting of multi-component alloys, characterized in that: It includes an induction coil power supply (1), an induction coil (101), a pressure gauge (6), a furnace body (7), a rotating base (9), a support rod (10), a transition rod welded part (11), a support rod (12), a rotating motor (13), a connecting wire (14), a control cabinet (15), a bench frame assembly (16), and a water-cooled copper crucible body (19); The water-cooled copper crucible body (19) is installed inside the furnace body (7), and the water-cooled copper crucible body (19) is cooled by the upper water-cooling method; the bench frame assembly (16) is installed on the lower end face of the furnace body (7) through the support rod (12), the upper part of the rotating base (9) is installed at the lower end of the water-cooled copper crucible body (19), the lower part of the rotating base (9) is connected to the support rod (10), the upper part of the support rod (10) extends upward into the water-cooled copper crucible body (19), the induction coil (101) is sleeved on the water-cooled copper crucible body (19), and the induction coil (101) is connected to the induction coil power supply (1) located outside the furnace body (7), and the pressure gauge (6) is installed on the upper end face of the furnace body (7) through a gauge base; The middle part of the support rod (10) passes downward through the furnace body (7) and the bench frame assembly (16) and extends into the bench frame assembly (16), and the transition rod welded part (11) is sleeved on the support rod (10) between the furnace body (7) and the bench frame assembly (16); the lower part of the support rod (10) is connected to the output shaft of the rotating motor (13) inside the bench frame assembly (16), and the rotating motor (13) is connected to the control cabinet (15) through the connecting wire (14); The induction coil (101) includes an inner layer coil (102) and an outer layer coil (103), and the inner layer coil (102) and the outer layer coil (103) are double-sleeved on the outside of the water-cooled copper crucible body (19) from the inside to the outside.

2. The high-frequency induction heating double-coil coupled rotary regulation melting equipment for processing multi-component alloys according to claim 1, wherein: It further includes a water-cooling system, and the water-cooling system includes a water inlet pipe (23), a water outlet pipe (20), a water inlet pipe plug-in board (24), and a water outlet pipe plug-in board (21). The water inlet pipe plug-in board (24) and the water outlet pipe plug-in board (21) are both installed on the inner side wall of the furnace body (7). One ends of the water inlet pipe (23) and the water outlet pipe (20) are respectively connected to the water inlet pipe plug-in board (24) and the water outlet pipe plug-in board (21), and the other ends of the water inlet pipe (23) and the water outlet pipe (20) are connected to the water-cooled copper crucible body (19).

3. The device for high-frequency induction heating double-coil coupling rotation regulation smelting of multi-component alloy according to claim 2, characterized in that: The water-cooling system further includes a water inlet interface (18) and a water outlet interface (17), and the other ends of the water inlet pipe (23) and the water outlet pipe (20) are respectively connected to the water-cooled copper crucible body (19) through the water inlet interface (18) and the water outlet interface (17).

4. The high-frequency induction heating double-coil coupled rotary control melting equipment for processing multi-component alloys according to claim 3, characterized in that: The water-cooling system further includes an induction coil water inlet pipe (25) and an induction coil water outlet pipe (22). One ends of the induction coil water inlet pipe (25) and the induction coil water outlet pipe (22) are connected to the water inlet pipe plug-in board (24) and the water outlet pipe plug-in board (21), and the other ends of the induction coil water inlet pipe (25) and the induction coil water outlet pipe (22) are connected to the outer layer coil (103).

5. The high-frequency induction heating double-coil coupled rotation control melting equipment for processing multi-component alloys according to claim 1 or 4, characterized in that: The bottom of the rotating base (9) and the water-cooled copper crucible body (19) is welded to the inner water tank wall of the purple copper crucible of the water-cooled copper crucible body (19) by welding.

6. The high-frequency induction heating double-coil coupling rotary control melting equipment for processing multi-component alloys according to claim 5, wherein: The support rod (10) is fixedly or sealingly connected to the lower end surface of the water-cooled copper crucible body (19).

7. An apparatus for high-frequency induction heating double-coil coupling rotation regulation smelting of multicomponent alloys according to claim 1, characterized in that: The bottom of the induction coil (101) is located at a position 3 - 5 cm above the bottom of the water-cooled copper crucible body (19).

8. An apparatus for high-frequency induction heating double-coil coupling rotation regulation smelting of multi-component alloy according to claim 7, characterized in that: It further includes an upper observation window (5), an upper observation window gland (4), a front observation window (3) and a front observation window gland (2). The front observation window (3) is opened on the side end surface of the furnace body (7), and the front observation window gland (2) is press-fitted on the front observation window (3). The upper observation window (5) is opened on the upper end surface of the furnace body (7), and the upper observation window gland (4) is press-fitted on the upper observation window 5.

9. A smelting method for a high-frequency induction heating double-coil coupled rotation control smelting device for processing multi-component alloys as described in claim 7 or 8, characterized in that: It includes the following steps: Step 1: Place the prepared superalloy raw materials into the water-cooled copper crucible body (19), and close the furnace door of the furnace body (7). Step 2: Turn on the external circulating water cooling device, and observe whether there is water leakage inside the furnace body through the front observation window (3). Step 3: Open the air valve, perform the operation of evacuating the inside of the furnace body (7), and observe the reading of the pressure gauge (6). When the air pressure in the furnace reaches , close the air valve, open the argon valve, and introduce argon into the furnace body (7), and charge 0.05 MPa of argon into it. Step 4: Turn off the external power switch and the power switch of the control panel. Step 5: Set the rotation speeds of the rotary motor (13) and the support rod (12) through the control cabinet (15). The rotation speed range of the support rod (12) is 1200 - 2000 r. Heat the raw materials by the induction coil (101) through the control of the control panel. The adjustable range of the heating time of the induction coil (101) is 4 - 10 min. Adjust the inner layer coil (102) of the induction coil (101), and the adjustable range of its heating power is 30 - 60 kW. Then press the start heating button to start the whole equipment and heat and melt the raw materials. When there are still 50 s left before the induction heating time, press the start button of the outer layer coil (103), and the adjustable range of its heating power is 10 - 30 kW. Apply the coupled bottom rotation of the double-layer coils when the alloy is in a superheated state. Step 6: When applying the coupled action of the inner and outer layer coils during the melting process, observe the stable running state of the multi-component alloy during rotation and solidification in the furnace through the upper observation window (5), and confirm that the liquid level of the alloy ingot during solidification is relatively stable through the observation window (5) above the furnace body (7). Step 7: Repeat the operations of Step 5 and Step 6 to make the ingot rotate and remelt repeatedly for 5 - 10 times, so as to ensure that the composition of each part of the alloy is uniform. If heat treatment operations are required according to experimental requirements, during the last heating and melting process, after setting the heating parameters, perform a heat preservation operation. The heat preservation time is set to 3 - 5 min, and the heat preservation power of the induction coil (101) is adjusted to 5 - 15 kW. Thus, the preparation of the multi-component superalloy is completed.

10. The smelting method according to claim 9, characterized in that: The superalloy raw materials in Step 1 are Nb-16Si-22Ti superalloy.

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