WO2022033463A1

WO2022033463A1 - Method for removing inclusions from high-temperature alloy by electron beam overheating dissolution

Info

Publication number: WO2022033463A1
Application number: PCT/CN2021/111740
Authority: WO
Inventors: 谭毅; 游小刚; 王轶农; 李鹏廷; 庄辛鹏; 赵龙海; 崔弘阳; 张慧星
Original assignee: 大连理工大学
Priority date: 2020-08-11
Filing date: 2021-08-10
Publication date: 2022-02-17
Also published as: CN112095019B; CN112095019A

Abstract

Provided is a method for removing inclusions from a high-temperature alloy by electron beam overheating dissolution. The method comprises the following steps: pre-treating a high-temperature alloy raw material; and removing inclusions by means of electron beam refining and electron beam overheating dissolution, so as to obtain a high-purity high-temperature alloy cast ingot. The present invention uses the characteristics of a high vacuum and a local ultra-high temperature in an electron beam refining process, a local overheating treatment is performed on a high-temperature alloy melt, such that the in-situ dissolution and removal of small size inclusions inside the melt is achieved, and a new way for the deep removal of inclusions is provided.

Description

A method for removing inclusions in superalloy by electron beam superheated dissolution

technical field

The invention relates to a method for removing inclusions in a superalloy by overheating electron beam dissolving.

Background technique

Inclusions in superalloys seriously affect the mechanical properties of alloys at room temperature and high temperature, especially low-cycle fatigue properties, thereby reducing their long-life service stability. In order to control inclusions in superalloys, a lot of research has been carried out in my country. At present, the use of foam ceramic filtration to promote the floating of inclusions in the molten pool or the adsorption of inclusions floating to the surface is the main method of inclusion removal in the smelting process. way. According to the Stokes law of the movement of inclusions, the smaller the size of the inclusions, the slower the floating speed, and the more difficult it is to remove the inclusions by floating, and the foam ceramic filtration only has a good effect on large-sized inclusions. Published literature reports found that the existing methods can successfully remove inclusions larger than 10 μm in superalloys, but the removal effect of inclusions with small particle size (<10 μm) is very limited.

The invention innovatively proposes to use electron beam special metallurgy to realize the in-situ dissolution and removal of small-sized inclusions in the superalloy. Electron beam refining technology is a process of using high-energy density electron beams to bombard the surface of materials to melt and refine materials. This technology is widely used in the refining of refractory metals and alloys, the preparation of high-purity special steel and ultra-clean Refining and purifying titanium and titanium alloys and other fields. The electron beam has a very high energy density, and has the characteristics of controllable beam current, adjustable beam spot, and high degree of automation. The characteristics of vacuum (5×10 ^-3 Pa) and large temperature gradient inside the melt can create conditions for in-situ removal of inclusions and provide a new way for deep removal of inclusions.

SUMMARY OF THE INVENTION

According to the above-mentioned existing methods, the inclusions of more than 10 μm in the superalloy can be successfully removed, and the removal effect of the inclusions with small particle size (<10 μm) is very limited. Methods for inclusions in superalloys. The invention mainly utilizes the characteristics of high vacuum and local ultra-high temperature in the electron beam refining process to perform local superheat treatment on the superalloy melt, so as to realize the in-situ dissolution and removal of small-sized inclusions in the melt and provide deep removal of inclusions. new way.

The technical means adopted in the present invention are as follows:

A method for removing inclusions in a superalloy by overheating electron beam dissolving, comprising the following steps:

S1. Pretreatment of superalloy raw materials;

S11. Select the superalloy raw material, process the superalloy raw material to a suitable size, and grind the processed superalloy raw material;

S12. Use deionized water and alcohol to clean the polished superalloy raw materials, respectively. After cleaning, place the superalloy raw materials in a drying box, and dry them at 30°C for later use;

S2. Clean the water-cooled copper crucible for electron beam refining: grinding, alcohol wiping, drying;

S3. Clean up the pollutants on the furnace body and furnace wall of the electron beam smelting furnace to avoid the introduction of foreign impurities in the refining process;

S4. Place the pretreated superalloy raw materials in the water-cooled copper crucible of the electron beam melting furnace, and close the furnace door after confirming that the raw materials are ready and the furnace body is clean;

S5. Carry out vacuum pre-pumping on the electron beam melting furnace and the gun body of the electron gun to achieve the target vacuum degree;

S6. After reaching the target vacuum degree, preheat the electron gun filament; after the electron gun filament is preheated, melt the superalloy raw material in the water-cooled copper crucible;

S7. After the raw material of the superalloy is completely melted, the electron beam refining process is started;

S8. After 10min of electron beam refining, the superalloy melt is overheated by the cyclic superheating method;

S9. After the superalloy melt is overheated, the enrichment of large-sized inclusions in the final solidification zone on the surface of the ingot;

S10. Turn off the high voltage of the left and right electron guns, increase the beam current to 60mA to make the high voltage value 0, and then turn off the electron gun, so that the superalloy ingot is fully solidified and cooled in the water-cooled copper crucible;

S11. After the furnace body and the gun body are cooled for 2 hours, the superalloy ingot refined by electron beam is taken out, and the final solidification zone enriched with inclusions on the surface of the superalloy ingot is removed, thereby obtaining a high-purity superalloy ingot.

Further, the specific steps of the step S5 are as follows:

Turn on the electron beam refining equipment, and pump the electron beam melting furnace body and electron gun body to the target vacuum state. The vacuum degree of the furnace body is required to be less than 5×10 ^-2 Pa, and the vacuum degree of the gun body is required to be less than 5×10 ^-3 Pa.

Further, the specific steps of the step S6 are as follows:

After reaching the target vacuum degree, start the electron guns on both sides so that the beam current is 120mA, and preheat for 12 minutes; after preheating, adjust the electron gun beam current to 0, start the high voltage, and slowly increase the electron gun beam current to 500mA after the high pressure is stable. The beam spot radius was adjusted to 25mm, and the parameters of the electron gun were kept unchanged, and the superalloy raw materials in the water-cooled copper crucible were melted in a circular scanning path.

Further, the specific steps of the step S7 are as follows:

After the superalloy is completely melted, the raw material of the superalloy is continuously refined by means of electron beam circular scanning, so that the volatile impurities in the superalloy melt can be fully removed, so that the large-sized inclusions in the superalloy are in the buoyancy and Marango. Under the action of Ni effect, it gradually rises to the surface of the melt.

Further, the specific steps of the step S8 are as follows:

S81. Increase the beam size of the electron beam to 600-800mA, and the beam current increase rate is 100mA/min. When the power is increased to the specified power, the beam spot position is fixed to the center of the superalloy ingot, and the melt is superheated for 10min under this condition. ;

S82, then reduce the beam size to 500mA at a rate of 100mA/min, and refine the superalloy for 5min in a circular scanning manner;

S83. Increase the beam size of the electron beam again to 600-800mA, and the beam current increase rate is 100mA/min. When the power is increased to the specified power, the position of the beam spot is fixed to the center of the superalloy ingot, and the melt is superheated under this condition. For 10 min, the above process was repeated in this way, and the superalloy melt was subjected to three cycles of superheat treatment.

Further, the specific steps of the step S9 are as follows:

After three cycles of overheating, the beam size was reduced to 500mA, and the electron beam refining parameters were controlled to make the electron beam spot move slowly from left to right. During the movement of the beam spot, a slow beam drop was used to gradually reduce the beam current. At the same time, the radius of the beam spot is reduced, so that the beam current size is reduced to 0mA within 5min, the beam spot radius is reduced to 0, and the beam spot is moved to the right edge area of the superalloy ingot, so as to achieve large-sized inclusions The enrichment of the last solidification zone on the surface of superalloy ingots.

Further, the raw material is a rod-shaped, block-shaped or irregular-shaped superalloy.

Further, in the step S4, when the raw material is a rod-shaped superalloy, the pretreated rod-shaped superalloy is installed on the horizontal feeding mechanism in the electron beam melting furnace, and the right end of the rod-shaped superalloy is located at the right end of the rod-shaped superalloy by adjusting the horizontal feeding mechanism. Above the water-cooled copper crucible; when the raw materials are bulk or irregular-shaped superalloys, the raw materials can be directly placed in the water-cooled copper crucible, so that continuous feeding can be performed during the electron beam refining process.

Compared with the prior art, the present invention has the following advantages:

1. The method for removing inclusions in superalloys by electron beam superheating dissolution provided by the present invention utilizes the characteristics of high vacuum and local ultra-high temperature in the electron beam refining process to locally superheat the superalloy melt, so as to realize the small size inside the melt. The in-situ dissolution and removal of sized inclusions provides a new way for deep removal of inclusions. The invention innovatively adopts the electron beam superheating method to dissolve and remove the small-sized inclusions in the melt in situ, and remove the small-sized inclusions in the superalloy melt. The method of the present invention still belongs to the field of superalloy inclusion removal. First.

2. The method for removing inclusions in superalloys by electron beam overheating dissolution provided by the present invention, the basic principle of using electron beam overheating dissolution to remove inclusions in superalloys is to adjust the parameters of electron beam refining to make the superalloy melt generate local overheating. In the environment of local ultra-high temperature and large superheat inside the melt, the small-sized inclusions in the melt will undergo diffusion and dissolution reaction, so as to realize the in-situ dissolution and removal of inclusions. The preparation of superalloy ingots by this method can effectively remove small-sized inclusions (Al ₂ O ₃ , SiO ₂ , CaO, etc.) in superalloys. Combined with electron beam induced solidification, cold source gettering technology, etc., the high temperature is comprehensively reduced. The content of inclusions in the alloy.

3. The method for removing inclusions in superalloys by electron beam overheating provided by the present invention, on the basis of electron beam refining, utilizes local overheating of the melt to strengthen the diffusion and dissolution reaction of small-sized inclusions in the melt, thereby realizing superalloys In-situ dissolution and removal of small and medium-sized inclusions, combined with electron beam-induced solidification technology, can comprehensively reduce the content of inclusions in superalloys. The size of the largest inclusion in the FGH4096 alloy prepared by this method is less than 5μm, and the content of the inclusion is less than 1.0mg/kg, which has a leading domestic level in the control of inclusions in the FGH4096 alloy.

In summary, the application of the technical solution of the present invention can solve the problem that the existing methods can successfully remove the inclusions larger than 10 μm in the superalloy, but the removal effect of the inclusions with small particle size (<10 μm) is very limited.

Based on the above reasons, the present invention can be widely applied in the fields of metal material inclusion removal and the like.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a schematic diagram of the process of removing inclusions by electron beam superheated dissolution in a specific embodiment of the present invention.

FIG. 2 is a schematic diagram of the enrichment of inclusions in the final solidification zone in a specific embodiment of the present invention.

In the figure: 1. Oil diffusion pump; 2. Valve; 3. Mechanical pump; 4. Local overheating zone of the melt; 5. Small inclusions in the melt; 6. Alloy melt; 7. Ingot pulling mechanism; 8. Cooling water; 9. Electron gun; 10. Electron beam; 11. Large-sized inclusions floating up to the melt surface; 12. Water-cooled copper crucible; 13. Roots pump; 14. Large-sized inclusions gathered in the final solidification zone.

detailed description

It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is only a part of the embodiments of the present invention, but not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work, all belong to the protection scope of the present invention.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the invention unless specifically stated otherwise. Meanwhile, it should be understood that, for convenience of description, the dimensions of various parts shown in the accompanying drawings are not drawn in an actual proportional relationship. Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the authorized specification. In all examples shown and discussed herein, any specific values should be construed as illustrative only and not limiting. Accordingly, other examples of exemplary embodiments may have different values. It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further discussion in subsequent figures.

The invention provides a method for removing inclusions in a superalloy by overheating electron beam dissolving, comprising the following steps:

1. Pretreatment of superalloy raw materials

1. The present invention can use rod-shaped, block-shaped or irregular superalloys as raw materials. When the raw material is rod-shaped, a horizontal feeding mechanism can be used to feed the material, so that the rod-shaped raw material is located above the water-cooled copper crucible and is in the electron beam scanning range, The bar diameter is about 20-50mm and the length is about 1m. When the raw material is in bulk or other irregular shape, it is placed in a water-cooled copper crucible.

2. In this example, the FGH4096 bulk superalloy with strict requirements on impurities and inclusion content is selected as the raw material. First, the FGH4096 superalloy is wire-cut to an appropriate size, which can be placed in a water-cooled copper crucible. Grind the bulk raw material after wire cutting to remove the surface oxide layer and wire cutting marks.

3. Use deionized water and alcohol to clean the polished FGH4096 superalloy raw materials respectively. After cleaning, place the FGH4096 superalloy in a drying box and dry it at 30°C until it is used for electron beam refining.

2. Electron beam refining and electron beam superheated dissolution to remove inclusions

1. Clean the water-cooled copper crucible for electron beam refining (grinding, alcohol wiping, drying) to ensure that the water-cooled copper crucible is clean and pollution-free.

2. Clean up the pollutants on the furnace body and furnace wall of the electron beam melting furnace to avoid the introduction of foreign impurities in the refining process.

3. Place the pretreated bulk FGH4096 superalloy raw materials in a water-cooled copper crucible, and close the furnace door after confirming that the raw materials are ready and the furnace body is clean.

4. Turn on the electron beam refining equipment, and pump the furnace body and gun body to the target vacuum state. The vacuum degree of the furnace body is required to be less than 5×10 ^-2 Pa, and the vacuum degree of the gun body is required to be less than 5×10 ^-3 Pa , after reaching the target vacuum degree, start the electron guns on both sides to make the beam size 120mA, and preheat for 12 minutes.

5. After preheating, adjust the electron gun beam current to 0, start the high voltage, slowly increase the electron gun beam current to 500mA after the high voltage is stable, adjust the beam spot radius to 25mm, keep the electron gun parameters unchanged, and melt the water-cooled copper in a circular scanning path FGH4096 superalloy raw material in crucible.

6. After the FGH4096 superalloy is completely melted, continue to refine the FGH4096 superalloy by means of electron beam circular scanning, so that the volatile impurities in the FGH4096 superalloy melt can be fully removed, so that large-sized inclusions in the FGH4096 superalloy Under the action of buoyancy and Marangoni effect, it gradually rises to the surface of the melt.

7. After 10min of electron beam refining, the melt is overheated by cyclic superheating method, specifically: increase the beam current size of the electron beam to 600-800mA, and the beam current increase rate is 100mA/min. When the power is increased to the specified power, the beam is fixed. From the spot position to the center of the ingot, the melt was superheated for 10 min under this condition (Fig. 1); then the beam size was reduced to 500 mA at a rate of 100 mA/min, and the alloy was refined in a circular scan for 5 min; increased again The size of the electron beam beam is 600-800mA, and the beam current increase rate is 100mA/min. When the power is increased to the specified power, the beam spot position is fixed to the center of the FGH4096 superalloy ingot, and the melt is superheated for 10min under this condition. Repeating the above process, the FGH4096 superalloy melt was subjected to three cycles of superheat treatment.

8. After three cycles of overheating, reduce the beam size to 500mA, control the electron beam refining parameters so that the electron beam spot moves slowly from left to right, and the beam is gradually reduced by slow beam drop during the movement of the beam spot. At the same time, the radius of the beam spot is reduced, so that the beam current size is reduced to 0mA within 5min, and the beam spot radius is reduced to 0. At the same time, the beam spot moves to the right edge area of the FGH4096 superalloy ingot, so as to achieve large The enrichment of dimensional inclusions in the final solidification zone on the surface of the FGH4096 superalloy ingot (Fig. 2).

9. Turn off the high voltage of the left and right electron guns, increase the beam current to 60mA to make the high voltage value 0, then turn off the electron gun, so that the ingot is fully solidified and cooled in the water-cooled copper crucible.

10. After the furnace body and the gun body are cooled for 2 hours, the FGH4096 superalloy ingot refined by electron beam is taken out, and the final solidification zone enriched with inclusions on the surface of the ingot is removed to obtain a high-purity FGH4096 superalloy ingot.

Figure 1 is a schematic diagram of the process of removing inclusions by electron beam superheating dissolution in the present invention, and Figure 2 is a schematic diagram of the inclusion enrichment in the final solidification zone in the present invention. The present invention adopts the equipment shown in Fig. 1 and Fig. 2 to carry out electron beam overheating dissolution to remove inclusions in the superalloy. The electron gun 9 is fixed on the top two corners of the electron beam melting furnace, the water-cooled copper crucible 12 is placed in the electron beam melting furnace, the circulating cooling water 8 is passed into the water-cooled copper crucible 12, and the high-temperature alloy raw material is placed in the water-cooled copper crucible 12, which is in the electron beam melting furnace. Beam 10 scan range. The oil diffusion pump 1 is adjacent to the mechanical pump 3, and the connection between the two is controlled by the valve 2; the roots pump 13 is adjacent to the furnace mechanical pump 3, and the two are connected together; the ingot pulling mechanism 7 is located in the water-cooled copper crucible 12 Below, the up and down movement of the water-cooled copper crucible 12 can be controlled by the ingot pulling mechanism 7 . The partial overheating zone 4 of the melt is a hemispherical overheating zone on the surface of the alloy melt 6 that is produced by the bombardment of the electron beam. During the electron beam refining process, the small-sized inclusions 5 inside the melt are randomly distributed in the alloy melt 6 and float upward. The large-sized inclusions 11 reaching the melt surface are evenly distributed on the upper surface of the alloy melt 6 , and after electron beam-induced solidification, the large-sized inclusions 14 gathered in the final solidification zone are locally enriched on the upper surface of the alloy melt 6 .

Traditional smelting technologies, such as vacuum induction melting, electroslag remelting, etc., are limited by temperature and vacuum degree, and it is difficult to create thermodynamic conditions for in-situ dissolution of inclusions. Electron beam refining has the characteristics of high vacuum and local ultra-high temperature. The removal of small-sized inclusions less than 5 μm in size provides a new approach. On the basis of electron beam refining, the method of the invention utilizes local overheating of the melt to strengthen the diffusion and dissolution reaction of small-sized inclusions in the melt, thereby realizing the in-situ dissolution and removal of small-sized inclusions in the superalloy, and combined with the electron beam induced solidification technology , which can comprehensively reduce the content of inclusions in superalloys. The method of the present invention is suitable for any superalloy, and is effective for the removal of all superalloy inclusions, wherein the size of the largest inclusion in the FGH4096 superalloy prepared by the method of the present invention is less than 5 μm, and the content of the inclusion is less than 1.0 mg/kg, It has the leading domestic level in the control of inclusions in FGH4096 superalloy.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. Scope.

Claims

A method for removing inclusions in a superalloy by electron beam superheating dissolution, characterized in that it comprises the following steps:

S1. Pretreatment of superalloy raw materials;

S11. Select the superalloy raw material, process the superalloy raw material to a suitable size, and grind the processed superalloy raw material;

S12. Use deionized water and alcohol to clean the polished superalloy raw materials, respectively. After cleaning, place the superalloy raw materials in a drying box, and dry them at 30°C for later use;

S2. Clean the water-cooled copper crucible for electron beam refining: grinding, alcohol wiping, drying;

S3. Clean up the pollutants on the furnace body and furnace wall of the electron beam smelting furnace to avoid the introduction of foreign impurities in the refining process;

S4. Place the pretreated superalloy raw materials in the water-cooled copper crucible of the electron beam melting furnace, and close the furnace door after confirming that the raw materials are ready and the furnace body is clean;

S5. Carry out vacuum pre-pumping on the electron beam melting furnace and the gun body of the electron gun to achieve the target vacuum degree;

S6. After reaching the target vacuum degree, preheat the electron gun filament; after the electron gun filament is preheated, melt the superalloy raw material in the water-cooled copper crucible;

S7. After the raw material of the superalloy is completely melted, the electron beam refining process is started;

S8. After 10min of electron beam refining, the superalloy melt is overheated by the cyclic superheating method;

S9. After the superalloy melt is overheated, the enrichment of large-sized inclusions in the final solidification zone on the surface of the ingot;

S10. Turn off the high voltage of the left and right electron guns, increase the beam current to 60mA to make the high voltage value 0, and then turn off the electron gun, so that the superalloy ingot is fully solidified and cooled in the water-cooled copper crucible;

S11. After the furnace body and the gun body are cooled for 2 hours, the superalloy ingot refined by electron beam is taken out, and the final solidification zone enriched with inclusions on the surface of the superalloy ingot is removed, thereby obtaining a high-purity superalloy ingot.
The method for removing inclusions in a superalloy by electron beam overheating dissolution according to claim 1, wherein the specific steps of the step S5 are as follows:

Turn on the electron beam refining equipment, and pump the electron beam melting furnace body and electron gun body to the target vacuum state. The vacuum degree of the furnace body is required to be less than 5×10 -2 Pa, and the vacuum degree of the gun body is required to be less than 5×10 -3 Pa.
The method for removing inclusions in a superalloy by electron beam overheating dissolution according to claim 1, wherein the specific steps of the step S6 are as follows:

After reaching the target vacuum degree, start the electron guns on both sides so that the beam current is 120mA, and preheat for 12 minutes; after preheating, adjust the electron gun beam current to 0, start the high voltage, and slowly increase the electron gun beam current to 500mA after the high pressure is stable. The beam spot radius was adjusted to 25mm, and the parameters of the electron gun were kept unchanged, and the superalloy raw materials in the water-cooled copper crucible were melted in a circular scanning path.
The method for removing inclusions in a superalloy by electron beam overheating dissolution according to claim 1, wherein the specific steps of the step S7 are as follows:

After the superalloy is completely melted, the raw material of the superalloy is continuously refined by means of electron beam circular scanning, so that the volatile impurities in the superalloy melt can be fully removed, so that the large-sized inclusions in the superalloy are in the buoyancy and Marango. Under the action of Ni effect, it gradually rises to the surface of the melt.
The method for removing inclusions in a superalloy by electron beam overheating dissolution according to claim 1, wherein the specific steps of the step S8 are as follows:

S81. Increase the beam size of the electron beam to 600-800mA, and the beam current increase rate is 100mA/min. When the power is increased to the specified power, the beam spot position is fixed to the center of the superalloy ingot, and the melt is superheated for 10min under this condition. ;

S82, then reduce the beam size to 500mA at a rate of 100mA/min, and refine the superalloy for 5min in a circular scanning manner;

S83. Increase the beam size of the electron beam again to 600-800mA, and the beam current increase rate is 100mA/min. When the power is increased to the specified power, the position of the beam spot is fixed to the center of the superalloy ingot, and the melt is superheated under this condition. For 10 min, the above process was repeated in this way, and the superalloy melt was subjected to three cycles of superheat treatment.
The method for removing inclusions in a superalloy by electron beam overheating dissolution according to claim 1, wherein the specific steps of the step S9 are as follows:

After three cycles of overheating, the beam size was reduced to 500mA, and the electron beam refining parameters were controlled to make the electron beam spot move slowly from left to right. During the movement of the beam spot, a slow beam drop was used to gradually reduce the beam current. At the same time, the radius of the beam spot is reduced, so that the beam current size is reduced to 0mA within 5min, the beam spot radius is reduced to 0, and the beam spot is moved to the right edge area of the superalloy ingot, so as to achieve large-sized inclusions The enrichment of the last solidification zone on the surface of superalloy ingots.
The method for removing inclusions in a superalloy by electron beam superheating dissolution according to any one of claims 1 to 6, wherein the raw material is a rod-shaped, block-shaped or irregular-shaped superalloy.
The method for removing inclusions in a superalloy by electron beam superheating dissolution according to claim 7, wherein in the step S4, when the raw material is a rod-shaped superalloy, the pretreated rod-shaped superalloy is mounted on the electron beam On the horizontal feeding mechanism in the smelting furnace, by adjusting the horizontal feeding mechanism, the right end of the rod-shaped superalloy is located above the water-cooled copper crucible; This enables continuous feeding during electron beam refining.