Vacuum induction melting method for alloying of an alloy containing a volatile element

Abstract

This invention relates to the field of smelting technology, specifically to a vacuum induction melting alloying method for alloys containing volatile elements. The method includes: adding a portion of the matrix molten material of the alloy to be melted into the molten pool of a melting chamber; evacuating the melting chamber; melting the matrix molten material in the molten pool with a target current, accumulating a first melting time; preparing a feeding box; placing the feeding box containing the volatile molten material into a charging chamber; evacuating the charging chamber until the charging chamber and the melting chamber reach pressure equilibrium; when the first melting time reaches a first preset time, opening the channel between the charging chamber and the melting chamber, and placing the feeding box into the molten pool to continue melting; when the feeding box is melting in the molten pool and the first melting time reaches the target melting time, the melting process ends. This solves the problems of low efficiency, low utilization rate of volatile elements, and difficulty in composition control during the alloying process.

Description

Technical Field

[0001] This invention relates to the field of smelting technology, and more specifically, to a vacuum induction melting alloying method containing volatile elements. Background Technology

[0002] In recent years, with the rise of new-generation engines and extreme energy systems, the research and application of high-temperature alloys have continued to develop. As an indispensable key material in modern industry, high-temperature alloys will continue to play an important role in future development due to their superior performance and broad application prospects. In the vacuum induction melting process of high-temperature alloys, volatile elements have high volatility and readily react with oxygen to form oxide inclusions, affecting alloy purity. Traditional processes typically involve adding volatile elements to the molten pool before casting to minimize volatilization and oxidation losses during the melting process and ensure the basic stability of element content.

[0003] Volatile elements are exothermic elements. When added to the molten pool, they will trigger a violent exothermic reaction, causing the temperature of the molten pool to rise rapidly. To prevent the high-temperature molten pool from corroding the crucible, the power supply needs to be interrupted to freeze the liquid surface. At the same time, the density of both is less than that of the molten pool. When added directly, they tend to accumulate in the liquid surface area. Instead, a large current is needed to stir to promote uniform distribution, which increases the risk of crucible corrosion. Furthermore, the surface alloying formed by the accumulation on the liquid surface will increase the loss of element volatilization. Summary of the Invention

[0004] To address the problems of low efficiency, poor utilization of volatile elements, and difficulty in composition control during alloying, this invention provides a vacuum induction melting alloying method containing volatile elements, comprising:

[0005] A portion of the matrix molten material of the alloy to be melted is placed into the molten pool of the melting chamber;

[0006] The melting chamber is evacuated;

[0007] The matrix molten material in the molten pool is melted with a target current, and the first melting time is accumulated.

[0008] Prepare a feeding box; wherein, when the feeding box is prepared, the feeding box contains a volatile molten material;

[0009] A feeding box containing volatile molten material is placed in the feeding chamber; wherein the feeding box has ventilation holes;

[0010] The charging chamber is evacuated until the charging chamber and the melting chamber reach pressure equilibrium;

[0011] When the first melting time reaches the first preset time, the channel between the feeding chamber and the melting chamber is opened, and the feeding box is placed into the molten pool to continue melting; wherein, after the feeding box is placed into the molten pool, the solution in the molten pool is sealed in the vent hole;

[0012] When the feeding box is smelted in the molten pool, and the first smelting time reaches the target smelting time, the smelting ends; wherein the target smelting time is longer than the first preset time.

[0013] In some embodiments, the step of opening the passage between the feeding chamber and the melting chamber and placing the feeding box into the molten pool when the first melting time reaches a first preset time includes:

[0014] When the first melting time reaches the first preset time, the current of the molten pool is adjusted to a first current; the first current is less than the target current;

[0015] When the molten pool is induction melting with the first current, the channel between the feeding chamber and the melting chamber is opened, and the feeding box is placed into the molten pool;

[0016] When the feeding box sinks below the liquid surface in the molten pool, the current in the molten pool is adjusted to a second current to continue smelting.

[0017] In some embodiments, the second current is greater than the target current;

[0018] The vacuum induction melting alloying method containing volatile elements also includes:

[0019] When the feeding box is smelting in the molten pool, and the first smelting time reaches the second preset time, the current of the molten pool is adjusted to the target current; wherein, the second preset time is longer than the first preset time; and the second preset time is shorter than the target smelting time.

[0020] In some embodiments, the feeding box is made of a portion of the matrix melt.

[0021] In some embodiments, the diameter of the vent hole is 2mm to 5mm; the diameter of the vent hole is positively correlated with the viscosity of the solution in the molten pool.

[0022] In some embodiments, the feeding box includes a box body and a cover; the box body is open; the cover is used to seal the open area of ​​the box body;

[0023] When the feeding box is completed, a winding thread is wrapped around the outside of the feeding box to fix the box body and the cover body to each other; the winding thread is part of the molten base material.

[0024] In some embodiments, the cover is in the shape of a flat plate; the bottom of the box is curved; the curved surface at the bottom of the box extends along a preset arc; the depth of the box gradually increases from both ends of the preset arc to the midpoint of the preset arc.

[0025] In some embodiments, the thickness of the bottom of the box gradually increases from both ends of the preset arc to the midpoint of the preset arc.

[0026] In some embodiments, the winding wire is provided in two sets; the two sets of winding wire are located at both ends of the preset arc; the cross-sectional diameter of the winding wire is greater than 2mm.

[0027] In some embodiments, the box body, the cover body, and the winding thread are base materials of different materials.

[0028] To address the problems of low efficiency, poor utilization of volatile elements, and difficulty in controlling composition during the alloying process, this invention has the following advantages:

[0029] By adding a portion of the matrix molten material of the alloy to be melted into the molten pool of the melting chamber and evacuating it, and then melting it with a target current for a cumulative first melting time, a feeding box with vent holes is prepared to encapsulate the volatile molten material. The feeding box is placed in the charging chamber and evacuated until the pressure is balanced with that of the melting chamber. When the first melting time reaches the first preset time, the material is added to the molten pool, causing the molten pool solution to block the vent holes and continue melting until the target melting time is reached. This allows volatile elements to melt and release in the area below the molten pool surface, delaying their exposure to the melt, thereby reducing the volatilization loss of volatile elements, improving the utilization rate of volatile elements and the accuracy of composition control. It avoids local overheating without freezing the liquid surface by cutting off the power, and promotes the uniform distribution of volatile elements in the melt. Ultimately, it solves the problems of low efficiency, low element utilization, and difficulty in composition control in the alloying process, while also reducing energy consumption and lowering melting costs. Attached Figure Description

[0030] Figure 1 A flowchart of a vacuum induction melting alloy containing volatile elements is shown as an embodiment;

[0031] Figure 2 A schematic diagram of a feeding box for vacuum induction melting alloys containing volatile elements is shown;

[0032] Figure 3 A schematic diagram of the lid and box of another vacuum induction melting alloy containing volatile elements is shown;

[0033] Figure 4 It shows Figure 3 A schematic diagram of a feeding box for vacuum induction melting alloys containing volatile elements;

[0034] Figure 5 It shows Figure 4 A cross-sectional view of a feeding box for vacuum induction melting alloys containing volatile elements.

[0035] Reference numerals: Feeding box 10; Box body 11; Cover 12; Vent hole 13; Winding line 14; Fastening line 15. Detailed Implementation

[0036] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0037] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0038] Volatile elements are exothermic elements. When added to the molten pool, they will trigger a violent exothermic reaction, causing the temperature of the molten pool to rise rapidly. To prevent the high-temperature molten pool from corroding the crucible, the power supply needs to be interrupted to freeze the liquid surface. At the same time, the density of both is less than that of the molten pool. When added directly, they tend to accumulate in the liquid surface area. Instead, a large current is needed to stir to promote uniform distribution, which increases the risk of crucible corrosion. Furthermore, the surface alloying formed by the accumulation on the liquid surface will increase the loss of element volatilization.

[0039] In this embodiment, to solve the above-mentioned problems, this application discloses a vacuum induction melting alloying method containing volatile elements. For example... Figure 1 As shown, the vacuum induction melting alloying method containing volatile elements includes steps S10 to S80. Steps S10 to S80 will be described in detail below:

[0040] Step S10 involves placing a portion of the matrix molten material of the alloy to be melted into the molten pool of the melting chamber, laying the foundation for subsequent melting and the addition of volatile molten materials, forming a stable initial melting environment, and ensuring the smooth progress of subsequent melting processes.

[0041] Step S20 involves evacuating the melting chamber. This evacuation eliminates air impurities within the melting chamber, preventing reactions between air and the base molten material and subsequent volatile materials, ensuring the purity of the melting process. It also provides the necessary conditions for melting in a vacuum environment, reducing the impact of impurities on alloy properties. Furthermore, evacuation significantly reduces the partial pressure of gases within the melting chamber, causing gases in the base molten material to escape rapidly, thus preventing damage to the strength, toughness, and density of the base molten material after cooling.

[0042] Step S30: Melt the base material in the molten pool with the target current, accumulate the first melting time, rapidly increase the temperature of the molten pool, and make the base material reach the molten state. The accumulated first melting time can ensure that the base material is fully melted and ensure the subsequent alloying effect.

[0043] Step S40: Prepare the feeding box 10. When the feeding box 10 is prepared, it contains volatile molten material, which is isolated from the external environment to prevent premature volatilization. At the same time, it provides a carrier for the directional delivery of volatile molten material. Through the protective function of the feeding box 10, the volatile elements can be melted and released in the area below the surface of the molten pool.

[0044] In step S50, the feeding box 10 containing volatile molten material is placed in the feeding chamber. The feeding box 10 has vent holes 13. The diameter of the holes is smaller than the particle size of the metal; this allows the viscous solution to block the vent holes 13 after the feeding box 10 falls into the molten pool, causing the feeding box 10 to melt preferentially and delaying the exposure of the volatile molten material to the melt.

[0045] Step S60: Vacuum the charging chamber until the charging chamber and the melting chamber reach pressure balance. This prevents the melt from splashing in the melting chamber due to pressure difference when the channel is opened, ensuring the safety and stability of the melting process, and preventing air from entering the melting chamber and affecting the melting purity.

[0046] In step S70, when the first melting time reaches the first preset time, ensuring that the base material has been fully melted, the channel between the feeding chamber and the melting chamber is opened, and the feeding box 10 is placed into the molten pool to continue melting. When the feeding box 10 is placed into the molten pool, the solution in the molten pool is sealed within the vent hole 13. Sealing the vent hole 13 with the molten pool solution further seals the volatile molten material within the feeding box 10, preventing it from evaporating above the liquid surface, reducing evaporation loss of volatile molten material at the liquid surface, and improving the alloying efficiency and utilization rate of volatile molten material. Simultaneously, the feeding operation can be completed without power interruption, avoiding the process of freezing the liquid surface due to power failure, thus improving production efficiency.

[0047] Step S80: When the feeding box 10 is smelting in the molten pool and the first smelting time reaches the target smelting time, the smelting ends. The target smelting time is longer than the first preset time. The target smelting time ensures that the volatile molten material in the feeding box 10 is fully melted and completely alloyed with the base molten material, ensuring uniform alloy composition. Because the volatile molten material melts and releases below the liquid surface, its melting area is locked below the liquid surface, resulting in a deeper initial alloying area, which is beneficial for the uniform distribution of elements in the melt and optimizes element distribution. Simultaneously, it reduces local overheating, lowers the risk of crucible erosion, extends crucible lifespan, improves element utilization, reduces energy consumption, and lowers overall smelting costs.

[0048] Further, step S70 includes steps S71, S72, and S73. The vacuum induction melting alloying method containing volatile elements is performed sequentially as follows: steps S10, S20, S30, S40, S50, S60, S71, S72, S73, and S80. Steps S71, S72, and S73 will be described in detail below:

[0049] Step S71: When the first melting time reaches the first preset time, adjust the current of the molten pool to a first current, which is less than the target current. By adjusting the molten pool current to a first current less than the target current, the temperature of the molten pool and the flow rate of the melt can be reduced, reducing the splashing of the melt when the feeding box 10 is added, creating a stable environment for the smooth addition of the feeding box 10, and at the same time avoiding the high-temperature melt from causing too rapid erosion of the feeding box 10, ensuring that the feeding box 10 can smoothly sink below the liquid surface.

[0050] Step S72: When the molten pool is induction melting with the first current, the channel between the feeding chamber and the melting chamber is opened. Opening the channel and placing the feeding box 10 under a stable melting environment can further ensure the safety and stability of the feeding process, avoid the impact of pressure fluctuations and melt splashing on the melting process, and at the same time ensure that the feeding box 10 is accurately placed into the molten pool.

[0051] In step S73, when the feeding box 10 sinks below the surface of the molten pool, the current in the molten pool is adjusted to the second current to continue melting. Adjusting the current after the feeding box 10 sinks below the surface can quickly restore melting efficiency, accelerate the melting and alloying process of volatile materials, and at the same time avoid premature volatilization of volatile elements due to excessive current during the feeding process, ensuring element utilization. The fact that it does not require power outages further improves production efficiency.

[0052] Furthermore, the second current is greater than the target current, which can quickly increase the temperature of the molten pool, accelerate the melting of the feeding box 10 and the release of volatile molten material, shorten the subsequent melting time, improve production efficiency, and at the same time ensure that the volatile molten material is fully melted, thus guaranteeing the alloying effect with the base material.

[0053] The vacuum induction melting alloying method containing volatile elements further includes step S74. The vacuum induction melting alloying method containing volatile elements sequentially executes steps S10, S20, S30, S40, S50, S60, S71, S72, S73, S74, and S80.

[0054] Step S74: When the feeding box 10 is melting in the molten pool, and the first melting time reaches the second preset time, adjust the current in the molten pool to the target current. The second preset time is longer than the first preset time, but shorter than the target melting time. The second preset time ensures that the volatile molten material in the feeding box 10 has been basically melted and released. Adjusting the current back to the target current at this point stabilizes the temperature of the subsequent melting process, ensures uniform alloy composition, avoids localized overheating due to prolonged high current, reduces the risk of crucible erosion, extends crucible lifespan, and simultaneously controls energy consumption and reduces melting costs.

[0055] Furthermore, the feeding box 10 is made of a portion of the base molten material. The use of a portion of the base molten material in the feeding box 10 ensures compatibility between the feeding box 10 and the base molten material in the molten pool. After melting, it can be directly integrated into the molten pool without introducing impurities, thus ensuring alloy purity. Simultaneously, there is no need to prepare additional material for the feeding box 10, improving material utilization and reducing smelting costs. Moreover, the feeding box 10 made of base molten material meets the temperature requirements of the vacuum smelting environment, ensuring that it does not melt prematurely before being placed below the surface of the molten pool.

[0056] Furthermore, such as Figure 2As shown, the diameter of the vent hole 13 is 2mm~5mm. The diameter of the vent hole 13 is positively correlated with the viscosity of the solution in the molten pool, which allows the vent hole 13 to adapt to molten pool solutions of different viscosities. This ensures that after the feed box 10 is placed into the molten pool, the molten pool solution can effectively seal the vent hole 13, prevent the volatilization of volatile elements, improve the element utilization rate, and at the same time avoid sealing failure or damage to the feed box 10 due to mismatch between the vent diameter and the solution viscosity.

[0057] Furthermore, such as Figure 2 As shown, the feeding box 10 includes a box body 11 and a cover 12. The box body 11 is open, and the cover 12 is used to seal the open area of ​​the box body 11. The open shape of the box body 11 facilitates the filling of volatile molten materials, and the cover 12 seals the open area to keep the volatile molten materials inside the feeding box 10, preventing leakage and volatilization of the volatile molten materials before feeding, ensuring the content of volatile elements, and improving element utilization.

[0058] When the feeding box 10 is completed, a winding thread 14 is wrapped around the outside of the feeding box 10 to fix the box body 11 and the cover body 12 to each other. The winding thread 14 is part of the base molten material. By fixing the box body 11 and the cover body 12 with the winding thread 14, it can be ensured that the box body 11 and the cover body 12 do not separate during the feeding and melting process, and the premature leakage of volatile molten material is avoided. The winding thread 14 is made of part of the base molten material, which can be integrated into the molten pool after melting without introducing impurities, ensuring the purity of the alloy, improving material utilization, and reducing melting costs.

[0059] Furthermore, such as Figure 3 As shown, the cover 12 is a flat plate, which facilitates a tight fit with the open area of ​​the box 11, improving the sealing effect. The bottom of the box 11 is curved. The curved surface of the bottom of the box 11 extends along a preset arc, and the depth of the box 11 gradually increases from both ends of the preset arc to the midpoint of the preset arc. The curved design of the bottom of the box 11 and the gradual increase in depth from both ends to the midpoint allow the feeding box 10 to sink smoothly below the liquid surface after being placed into the molten pool, thanks to its own gravity and the action of the molten pool fluid. This avoids tilting and premature leakage of volatile molten materials. At the same time, the curved structure reduces the impact between the feeding box 10 and the bottom of the molten pool, protecting the crucible and reducing the risk of crucible erosion.

[0060] Furthermore, such as Figure 5As shown, the thickness of the bottom of the box 11 gradually increases from both ends of the preset arc to the midpoint of the preset arc. This gradual increase in thickness at the bottom of the box 11 shifts the center of gravity of the feeding box 10 towards the midpoint of the preset arc at the bottom of the box 11. This ensures that the feeding box 10 is positioned with the bottom of the box 11 facing downwards and the cover 12 facing upwards during feeding, maintaining a stable feeding posture. Simultaneously, it enhances the structural strength of the bottom of the box 11, preventing damage due to pressure and temperature during immersion in the molten pool. This ensures that volatile molten materials can be stably melted and released below the liquid surface. Furthermore, the thickened bottom reduces the impact of localized overheating on the box 11, prolonging the stabilization time of the feeding box 10 in the molten pool, guaranteeing alloying effects, and further optimizing element distribution.

[0061] Furthermore, such as Figure 4 As shown, two sets of winding lines 14 are provided. The two sets of winding lines 14 are located at both ends of the preset arc, ensuring a more uniform and secure fixation between the box body 11 and the cover body 12, preventing leakage due to localized insecure fixation. The cross-sectional diameter of the winding lines 14 is greater than 2mm, enhancing their tensile strength and high-temperature resistance, ensuring no breakage during feeding and smelting, guaranteeing a sealing effect, preventing premature evaporation of volatile molten materials, improving element utilization, and reducing smelting failures caused by winding line breakage, thus improving production efficiency. Each set of winding lines 14 has more than 3 turns; the large diameter and numerous turns of the winding lines 14 give each set a certain weight. The two sets of winding lines 14 improve the uniformity of the overall weight distribution of the feeding box 10 along the length direction parallel to the cover body 12. The two ends of the cover body 12 correspond to the two ends of the preset arc, minimizing the risk of the feeding box 10 flipping and affecting its immersion posture under the liquid surface, reducing the frequency or probability of the feeding box 10 rolling over. The feeding box 10 also includes a fastening line 15, which connects between two sets of winding lines 14, forming an interlocking structure between the two sets of winding lines 14 and the fastening line 15, thus restricting the winding lines 14 from shifting in the left and right directions along the feeding box 10. In this way, even if the molten metal in the crucible churns violently during the melting and alloying process, the winding lines 14 can be prevented from falling off, ensuring a stable connection between the cover 12 and the box body 11, allowing the feeding box 10 to reach below the liquid surface, achieving the effect of delayed melting of easily volatile molten materials.

[0062] Furthermore, the box body 11, cover 12, and winding wire 14 are made of different base materials. The use of different base materials for the box body 11, cover 12, and winding wire 14 allows for the selection of suitable material properties based on the functional requirements of each component. For example, the box body 11 can be made of a material with high temperature resistance and strength, the cover 12 of a material with good sealing performance, and the winding wire 14 of a material with high toughness, ensuring the overall excellent performance of the feeding box 10. Simultaneously, the different base materials can all be integrated into the molten pool after melting, without affecting the alloy composition, ensuring alloy purity, and eliminating the need to prepare multiple non-base materials, thus reducing smelting costs. Using multiple base materials can minimize the difference in the proportion of various materials in the same batch of base materials, thereby ensuring the orderly and uniform addition of multiple base materials and improving the sufficiency of alloying.

[0063] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A vacuum induction melting alloying method containing volatile elements, characterized in that, The vacuum induction melting alloying method containing volatile elements includes: A portion of the matrix molten material of the alloy to be melted is placed into the molten pool of the melting chamber; The melting chamber is evacuated; The matrix molten material in the molten pool is melted with a target current, and the first melting time is accumulated. Prepare a feeding box; wherein, when the feeding box is prepared, the feeding box contains a volatile molten material; A feeding box containing volatile molten material is placed in the feeding chamber; wherein the feeding box has ventilation holes; The charging chamber is evacuated until the charging chamber and the melting chamber reach pressure equilibrium; When the first melting time reaches the first preset time, the channel between the feeding chamber and the melting chamber is opened, and the feeding box is placed into the molten pool to continue melting; wherein, after the feeding box is placed into the molten pool, the solution in the molten pool is sealed in the vent hole; When the feeding box is smelted in the molten pool, and the first smelting time reaches the target smelting time, the smelting ends; wherein the target smelting time is longer than the first preset time.

2. The vacuum induction melting alloying method containing volatile elements according to claim 1, characterized in that, The step of opening the passage between the feeding chamber and the melting chamber when the first melting time reaches the first preset time, and placing the feeding box into the molten pool, includes: When the first melting time reaches the first preset time, the current of the molten pool is adjusted to a first current; the first current is less than the target current; When the molten pool is induction melting with the first current, the channel between the feeding chamber and the melting chamber is opened, and the feeding box is placed into the molten pool; When the feeding box sinks below the liquid surface in the molten pool, the current in the molten pool is adjusted to a second current to continue smelting.

3. The vacuum induction melting alloying method containing volatile elements according to claim 2, characterized in that, The second current is greater than the target current; The vacuum induction melting alloying method containing volatile elements also includes: When the feeding box is smelting in the molten pool, and the first smelting time reaches the second preset time, the current of the molten pool is adjusted to the target current; wherein, the second preset time is longer than the first preset time; and the second preset time is shorter than the target smelting time.

4. The vacuum induction melting alloying method containing volatile elements according to claim 1, characterized in that, The feeding box is made from a portion of the matrix melt.

5. The vacuum induction melting alloying method containing volatile elements according to claim 1, characterized in that, The diameter of the vent hole is 2mm to 5mm; the diameter of the vent hole is positively correlated with the viscosity of the solution in the molten pool.

6. The vacuum induction melting alloying method containing volatile elements according to claim 1, characterized in that, The feeding box includes a box body and a cover; the box body is open; the cover is used to seal the open area of ​​the box body. When the feeding box is completed, a winding thread is wrapped around the outside of the feeding box to fix the box body and the cover body to each other; the winding thread is part of the molten base material.

7. The vacuum induction melting alloying method containing volatile elements according to claim 6, characterized in that, The cover is in the shape of a flat plate; the bottom of the box is curved; the curved surface of the bottom of the box extends along a preset arc; the depth of the box gradually increases from both ends of the preset arc to the midpoint of the preset arc.

8. The vacuum induction melting alloying method containing volatile elements according to claim 7, characterized in that, The thickness of the bottom of the box gradually increases from both ends of the preset arc to the midpoint of the preset arc.

9. The vacuum induction melting alloying method containing volatile elements according to claim 8, characterized in that, The winding line is provided in two sets; the two sets of winding lines are located at both ends of the preset arc; the cross-sectional diameter of the winding line is greater than 2mm.

10. The vacuum induction melting alloying method containing volatile elements according to claim 6, characterized in that, The box body, the cover body, and the winding thread are made of different materials from the base melt.

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