Ni-based single-crystal high-temperature alloy phase structure optimization method based on Ru alloying

Abstract

The invention discloses a Ru alloying-based Ni-based single-crystal high-temperature alloy phase structure optimization method which comprises the following steps: SP1, preheating raw materials in a preheating section of a solidification furnace, regulating and controlling components in a smelting section, stabilizing the Ru content and uniformly stirring; sP2, carrying out heating and crystal pulling in a gradient solidification section according to a preset temperature gradient to obtain a cast ingot; SP3, carrying out high-pressure gas quenching and cooling on the cast ingot to obtain a refined double-phase structure; sP4, directional stress treatment is carried out; and SP5, solid solution treatment and aging treatment are sequentially carried out in a heat treatment furnace to optimize the performance. According to the method, accurate adding and distribution regulation and control of the Ru element are innovatively achieved through the arranged solidification furnace, high-pressure gas quenching and dynamic stress treatment are combined, the structure stability and the high-temperature mechanical property of the Ni-based single-crystal high-temperature alloy are remarkably improved, and technical support is provided for industrial production of fourth-generation / fifth-generation single-crystal high-temperature alloy.

Description

Technical Field

[0001] The present invention relates to the technical field of superalloy materials, and specifically provides a method for optimizing the phase structure of Ru-alloyed Ni-based single-crystal superalloys. Background Art

[0002] Nickel-based superalloys are widely used in modern gas turbine engines, and approximately 40% of the engine materials are nickel-based superalloys. With the improvement of engine thrust and efficiency, the turbine inlet temperature continues to rise, imposing more stringent requirements on the performance of blade materials. Although the addition of Re can improve the performance of Ni-based single-crystal superalloys, Re is a strong topological close-packed (TCP) phase-forming element, and TCP phases are prone to precipitate during long-term use, damaging the high-temperature creep properties of the alloy. Moreover, Re has a high density and high cost. The addition of Ru can compensate for the deficiency in the tissue stability of Re-containing alloys, and the fourth-generation Ni-based single-crystal superalloys containing Ru have become a research hotspot. However, the mechanism of action of Ru in Ni-based single-crystal alloys has not been fully studied, and there are many controversies about its influence on the alloy phase structure.

[0003] The prior art discloses a device, method, and application for the directional solidification growth of single-crystal superalloys controlled by a multi-mode static magnetic field. However, this device and method cannot control the addition amount and distribution of specific alloying elements (such as Ru), and cannot effectively regulate the formation of microstructures during the heat treatment process, resulting in the alloy performance not reaching the optimal level. In addition, although this device and method can affect the single-crystal growth interface through the magnetic field, there are few targeted measures for suppressing the precipitation of harmful phases and refining the microstructure, and the effect in optimizing the alloy phase structure is not good. Summary of the Invention

[0004] The present invention provides a method for optimizing the phase structure of Ru-alloyed Ni-based single-crystal superalloys to solve the technical problems raised in the above background art.

[0005] The technical solution adopted by the present invention to solve the above technical problems is as follows:

[0006] The present invention provides a device for Ru-alloyed Ni-based single-crystal superalloys, including

[0007] A solidification furnace; the furnace body of the solidification furnace is divided into a preheating section, a melting section, and a gradient solidification section, and a feed hopper is provided at the top of the solidification furnace; an electric pusher plate is provided in the preheating section of the solidification furnace;

[0008] A melting hopper and a composition monitoring unit are provided in the melting section of the solidification furnace. An electric opening and closing door is provided at the bottom of the melting hopper, and an electric stirrer is provided in the melting hopper;

[0009] A crystal pulling unit is provided in the gradient solidification section of the solidification furnace. A crucible for holding the melt is provided on the crystal pulling unit. The crystal pulling unit is driven by a screw nut transmission structure to drive the solidified crystal in the crucible to grow downward.

[0010] Processing module;

[0011] The cooling unit is located in the processing module, and the processing module is connected to one side of the bottom of the solidification furnace; the cooling unit is connected to the high-pressure gas quenching unit;

[0012] The thermo-mechanical processing unit is located in the processing module, and a multi-axis stress loading mechanism is provided in the thermo-mechanical processing unit;

[0013] The heat treatment furnace is located in the processing module and is connected to a discharge hatch;

[0014] The component monitoring unit feeds back the monitoring data to the automatic feeding unit in real time.

[0015] Furthermore, the composition monitoring unit adopts an online LIBS composition monitoring system to monitor the Ru content in the melt in real time.

[0016] Furthermore, a transport unit is provided in the solidification furnace and the processing module, and the transport unit drives a rotatable mechanical clamp through a screw nut track to transfer the ingot between the crystal pulling unit, the cooling unit, the thermomechanical treatment unit and the heat treatment furnace.

[0017] The present invention provides a method for optimizing a Ru-alloyed Ni-based single crystal high-temperature alloy, the method comprising the following steps:

[0018] SP1, composition control, put the mixed Ni-based alloy raw materials and Ru target into the preheating section of the solidification furnace for preheating. After the preheating is completed, it enters the melting section, and then the Ru content is stabilized by the composition monitoring unit and the automatic feeding unit. At the same time, the electric stirrer is started to stir the melt evenly;

[0019] SP2, gradient solidification, heating the gradient solidification section of the solidification furnace according to a preset temperature gradient, while the crystal pulling unit performs crystal pulling to obtain a single crystal ingot;

[0020] SP3, cooling gas quenching, the ingot is moved to the cooling unit and cooled by the high-pressure gas quenching unit to form a uniform and refined γ / γ′ dual-phase structure;

[0021] SP4, stress treatment, the ingot is moved to the thermomechanical treatment unit for directional stress treatment;

[0022] SP5. Performance optimization: transfer the treated ingot to a heat treatment furnace and perform solid solution and aging treatment in sequence under an argon environment.

[0023] Further, in SP1, an electric pusher plate is used to push the preheated raw materials into the melting section. The preheating section is quickly heated to 1450 °C and the temperature is kept stable, providing a stable starting temperature environment for the subsequent melting and solidification processes. Subsequently, an electric stirrer continuously stirs for 30 min at a frequency of 5 kHz, effectively promoting the uniform distribution of Ru elements in the melt and reducing the phenomenon of compositional segregation. The Ru content in the melt is monitored in real time by a composition monitoring unit with a measurement accuracy of ±0.05 wt%, and the monitoring data is fed back to the automatic feeding unit in real time to keep the Ru content stable at 1.5 - 3.0 wt%.

[0024] Further, in SP2, the temperature gradient range of the gradient solidification section of the solidification furnace can be flexibly adjusted between 0.1 - 50 °C / mm. The crystal pulling unit drives the solidified crystal in the crucible to grow downward at a crystal pulling rate of 3 mm / min, causing the melt to gradually solidify from the high-temperature end to the low-temperature end and guiding the crystal to grow along a specific direction to form an ingot.

[0025] Further, in SP3, the high-pressure gas quenching unit sprays argon gas with a pressure of 3 MPa into the ingot from the pipeline, and the cooling rate is stable at 10 3 °C / s, which can effectively inhibit the precipitation of TCP phase and refine the γ / γ' raft structure.

[0026] Further, in SP4, the multi-axial stress loading mechanism applies an axial stress of 5 MPa to the ingot at 1100 °C through electric pressing plates in multiple directions and keeps it warm for 2 h, which can promote the diffusion of Ru elements into the γ phase and simultaneously form a dense dislocation network.

[0027] Further, in SP5, solution treatment and aging treatment are carried out in a heat treatment furnace. The solution treatment is to keep it warm at 1300 °C for 4 h in an argon-protected environment, and after the solution treatment, an aging treatment of keeping it warm at 900 °C for 24 h is carried out.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] 1. The present invention innovatively realizes the precise addition and distribution regulation of Ru elements through the set solidification furnace. Combining high-pressure gas quenching and dynamic stress treatment, it significantly improves the tissue stability and high-temperature mechanical properties of Ni-based single-crystal superalloys, providing technical support for the industrial production of the fourth-generation / fifth-generation single-crystal superalloys.

[0030] 2. Each section of the solidification furnace set in the present invention is independently temperature-controlled, and is equipped with automated components such as a feed hopper, an electric pusher plate, and an electric opening and closing door. Combining with the handling unit, a rotatable mechanical fixture is driven through a lead screw and nut track to transfer the ingot between each unit, realizing the automated operation of the entire method. This not only improves production efficiency but also reduces the influence of human factors on product quality, ensuring the stability of the method and the consistency of product quality.

[0031] 3. The composition monitoring unit (using an on-line LIBS composition monitoring system with a measurement accuracy of ±0.05 wt%) provided in the present invention monitors the Ru content in the melt in real time and feeds back the data to the automatic feeding unit, enabling the Ru content to be stabilized at 1.5 - 3.0 wt%. This ensures a high degree of accuracy of the alloy composition, effectively reduces the phenomenon of composition segregation, and lays a foundation for obtaining a Ni-based single crystal superalloy with stable performance; the Ru element is uniformly distributed in the alloy, which can improve the high-temperature strength, oxidation resistance, and creep resistance of the alloy.

[0032] 4. Through solution treatment and aging treatment, the present invention can endow the alloy with good comprehensive properties. The solution treatment enables the alloying elements to be fully dissolved to form a uniform solid solution, and the aging treatment promotes the precipitation of the second-phase particles, hinders the movement of dislocations, and significantly improves the strength, hardness, and thermal stability of the alloy, meeting the use requirements in high-temperature environments.

[0033] The following will explain and illustrate the present invention in detail in conjunction with the accompanying drawings and specific embodiments. Description of the Drawings

[0034] Figure 1 is the flow chart of the method steps of the present invention;

[0035] Figure 2 is the overall structure schematic diagram of the present invention;

[0036] Figure 3 is the side view of the overall structure of the present invention;

[0037] Figure 4 is the top view of the overall structure of the present invention;

[0038] Figure 5 is the top sectional view of the overall structure of the present invention;

[0039] Figure 6 is the sectional view of the solidification furnace structure of the present invention;

[0040] Figure 7 is the sectional view of the cooling unit structure of the present invention;

[0041] Figure 8 is the sectional view of the heat treatment unit structure of the present invention.

[0042] Description of the Drawings: 1. Solidification furnace; 101. Feed hopper; 102. Electric pusher plate; 103. Melting hopper; 104. Electric opening and closing door; 2. Processing module; 201. Cooling unit; 2011. High-pressure gas quenching unit; 202. Thermo-mechanical treatment unit; 2021. Multi-axial stress loading mechanism; 203. Heat treatment furnace; 3. Composition monitoring unit; 4. Automatic feeding unit; 5. Electric stirrer; 6. Crystal pulling unit; 7. Crucible; 8. Handling unit; 9. Discharge hatch. Detailed implementation manners

[0043] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant attached drawings. Several embodiments of the present invention are given in the attached drawings. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0044] The present invention provides a device for a Ru-alloyed Ni-based single crystal superalloy, including

[0045] A solidification furnace 1;

[0046] The furnace body of the solidification furnace 1 is divided into a preheating section, a melting section and a gradient solidification section, and a feed hopper 101 is provided at the top of the solidification furnace 1;

[0047] An electric push plate 102 is provided in the preheating section of the solidification furnace 1;

[0048] A melting hopper 103 and a composition monitoring unit 3 are provided in the melting section of the solidification furnace 1. An electric opening and closing door 104 is provided at the bottom of the melting hopper 103, and an electric stirrer 5 (specifically an electromagnetic stirrer) is provided in the melting hopper 103;

[0049] A crystal pulling unit 6 is provided in the gradient solidification section of the solidification furnace 1. A crucible 7 for placing the melt is provided on the crystal pulling unit 6, and the crystal pulling unit 6 is driven by a lead screw and nut transmission structure to drive the crystal solidified in the crucible 7 to grow downward;

[0050] A processing module 2;

[0051] A cooling unit 201 is located in the processing module 2, and the processing module 2 is connected to one side of the bottom of the solidification furnace 1; the cooling unit 201 is connected to a high-pressure gas quenching unit 2011;

[0052] A thermomechanical treatment unit 202 is located in the processing module 2, and a multi-axis stress loading mechanism 2021 is provided in the thermomechanical treatment unit 202;

[0053] A heat treatment furnace 203 is located in the processing module 2, and the heat treatment furnace 203 is connected to a discharge hatch 9;

[0054] The composition monitoring unit 3 feeds back the monitoring data to the automatic feeding unit 4 in real time.

[0055] The specific solution provided by the present invention is as follows: The composition monitoring unit 3 adopts an on-line LIBS composition monitoring system to monitor the Ru content in the melt in real time.

[0056] The specific solution provided by the present invention is as follows: A handling unit 8 is provided in the solidification furnace 1 and the processing module 2. The handling unit 8 drives a rotatable mechanical fixture through a lead screw nut track to transfer the ingot between the crystal pulling unit 6, the cooling unit 201, the thermo-mechanical treatment unit 202 and the heat treatment furnace 203.

[0057] The following is the specific optimization process using the above device:

[0058] Embodiment

[0059] Please refer specifically to the attached Figure 1 As shown, a method for optimizing the phase structure of a Ni-based single crystal superalloy based on Ru alloying, the optimization method includes the following steps:

[0060] SP1. Composition regulation: Put the Ni-based alloy raw material and the Ru target in a certain proportion into the preheating section of the solidification furnace 1, heat the preheating section to 1450 °C to preheat the raw material. After the preheating is completed, enter the melting section. The melting section melts the raw material into a melt at 1600 °C, and the electric stirrer 5 (electromagnetic stirrer) continuously stirs at a frequency of 5 kHz for 30 min to stir the melt evenly. The composition monitoring unit 3 in the melting section and the automatic feeding unit 4 at the top of the solidification furnace 1 cooperate with each other to stabilize the content of Ru in the raw material;

[0061] SP2. Gradient solidification: Set the temperature gradient of the gradient solidification section of the solidification furnace 1 to 20 °C / mm for heating. At the same time, the crystal pulling unit 6 pulls the crystal at a rate of 3 mm / min to obtain a single crystal ingot;

[0062] SP3. Cooling by gas quenching: Transfer the ingot from the gradient solidification section to the cooling unit 201 through the handling unit 8, and spray argon gas with a pressure of 3 MPa on the ingot through the high-pressure gas quenching unit 2011. The cooling rate is stabilized at 10 3 °C / s to form a uniform and refined γ / γ′ duplex structure;

[0063] SP4. Stress treatment: Transfer the gas-quenched ingot to the thermo-mechanical treatment unit 202 through the handling unit 8. The multi-axis stress loading mechanism 2021 applies an axial stress of 5 MPa to the ingot at 1100 °C through electric pressing plates in multiple directions and holds for 2 h for directional stress treatment;

[0064] SP5. Performance optimization: The handling unit 8 transfers the stress-treated ingot to the heat treatment furnace 203, and successively performs solution treatment (1300 °C / 4 h) and aging treatment (900 °C / 24 h) in an argon atmosphere to optimize the performance of the ingot.

[0065] It should be noted that the addition of Ru has an important impact on the properties of Ni-based alloys. On the one hand, Ru can significantly improve the high-temperature strength of the alloy. In a high-temperature environment, the atomic activity inside the alloy intensifies, which easily leads to the deformation and destruction of the crystal structure. The addition of Ru atoms can, through the solid-solution strengthening mechanism, hinder the movement of dislocations, thereby effectively enhancing the high-temperature strength of the alloy, enabling it to maintain good mechanical properties under high-temperature conditions and meet the usage requirements of high-temperature components such as aeroengines and gas turbines. On the other hand, Ru helps to improve the oxidation resistance of the alloy. When the alloy is exposed to a high-temperature oxidation environment, Ru will react with oxygen preferentially, forming a dense and stable oxide film on the surface of the alloy. This oxide film can prevent oxygen from further diffusing inward, thereby slowing down the oxidation rate of the alloy and extending its service life.

[0066] It should be noted that the content of Ru in the Ni-based alloy raw material is controlled at 1.5 - 3.0 wt%. If the content of Ru is lower than 1.5 wt%, the above-mentioned effects of enhancing high-temperature strength and oxidation resistance may not be obvious, resulting in poor performance of the alloy under harsh conditions such as high temperature and oxidation. When the content of Ru exceeds 3.0 wt%, not only will the production cost of the alloy increase, but also due to the overly complex interaction between Ru and other alloy elements, the tissue stability of the alloy may decrease, and even some adverse phase transformations may be triggered, having a negative impact on the comprehensive performance of the alloy. Therefore, it is crucial to accurately control the content of Ru in the Ni-based alloy raw material at 1.5 - 3.0 wt%, which is of great significance for ensuring that the alloy has excellent performance and good cost performance.

[0067] Please refer specifically to Appendix Figure 2 , 3 As shown in Figure 6, the furnace body of the solidification furnace 1 mentioned in SP1 is divided into a preheating section, a melting section, and a gradient solidification section. Each section has an independent temperature control function. The top of the solidification furnace 1 is provided with a feed hopper 101, and one side of the bottom is connected to a processing module 2. The preheating section of the solidification furnace 1 is provided with an electric pusher, the melting section is provided with a melting hopper 103 and a composition monitoring unit 3. The bottom of the melting hopper 103 is provided with an electric opening and closing door 104, and an electric stirrer 5 is arranged inside the melting hopper 103. A crystal pulling unit 6 is arranged in the gradient solidification section, and a crucible 7 for placing the melt is arranged on the crystal pulling unit 6.

[0068] It should be noted that when the raw materials first enter the melting hopper 103, the electric stirrer 5 can break up and disperse the larger pieces of raw materials, promoting the preliminary mixing between different raw materials. When the raw materials are in a molten state, the electric stirrer 5 can effectively promote the uniform distribution of Ru elements in the melt, reducing the phenomenon of composition segregation.

[0069] It should be noted that the component monitoring unit 3 adopts an on-line LIBS component monitoring system with a measurement accuracy of ±0.05wt%. This system is based on laser-induced breakdown spectroscopy technology, which can monitor the content of Ru in the melt in real time and feed the monitoring data back to the automatic feeding unit 4 in real time. The automatic feeding unit 4 accurately adjusts the addition amount of Ru target according to the monitoring feedback to ensure that the Ru content is stable at 1.5-3.0wt%. This content range has been verified by a large number of experiments and has the best effect on improving the high-temperature strength and oxidation resistance of the alloy.

[0070] It should be noted that the crystal pulling unit 6 adopts a screw-nut transmission method, which has the characteristics of high precision and strong stability. The screw rotates driven by a driving device such as a motor, and the nut cooperating with the screw will move linearly along the axial direction of the screw. Since the crucible 7 is firmly connected to the nut through a specific connection structure, when the nut moves downward, it will drive the crucible 7 to move downward synchronously. As the crucible 7 moves downward, the melt environment originally in the crucible 7 changes. In the thermal field environment for crystal growth, the high-temperature region is located above and the low-temperature region is located below. The downward movement of the crucible 7 causes the crystal that has solidified inside to grow downward accordingly. During this process, the melt gradually solidifies from the high-temperature end to the low-temperature end. This orderly solidification process from high temperature to low temperature creates good conditions for crystal growth; in this process of guiding crystal growth, the determination of a specific direction is very crucial. By precisely controlling various parameters such as the thermal field and crystal pulling speed, the crystal can grow along a pre-set specific direction. This directional growth helps to reduce crystal defects. For example, randomly grown crystals may generate defects such as dislocations and grain boundaries due to inconsistent growth speeds in different directions and irregular atomic arrangements. However, when growing along a specific direction, atoms have more time to arrange regularly, thus effectively reducing the probability of defect generation and significantly improving the quality of single crystal ingots.

[0071] Please refer specifically to Attachment Figure 2 、 3 As shown in Figures 4, 5, 7, and 8, the cooling unit 201, thermo-mechanical treatment unit 202, and heat treatment furnace 203 mentioned in SP3, SP4, and SP5 are all located in the processing module 2. The cooling unit 201 is connected to a high-pressure gas quenching unit 2011. A multi-axis stress loading mechanism 2021 is provided inside the thermo-mechanical treatment unit 202. There is a discharge hatch 9 on one side of the heat treatment furnace 203.

[0072] It should be noted that the high-pressure argon gas sprayed by the high-pressure gas quenching unit 2011 can quickly cool the ingot. This rapid cooling process is of great significance for the formation of the microstructure of the alloy. It can effectively inhibit the precipitation of the TCP phase (a harmful phase that may reduce the performance of the alloy), and at the same time promote the uniform refinement of the γ / γ′ duplex structure, thereby improving the comprehensive performance of the alloy, such as enhancing the toughness and fatigue resistance of the alloy.

[0073] It should be noted that the multi-axial stress loading mechanism 2021 applies pressure to the ingot through electric pressing plates arranged in multiple directions at high temperature. During this process, the combined action of high temperature and stress promotes the diffusion of Ru elements into the γ phase, redistributing them in the lattice structure of the alloy, and simultaneously forming a dense dislocation network inside the crystal. This change in the microstructure further strengthens the mechanical properties of the alloy, improves its strength and hardness, enabling it to better adapt to harsh working environments such as high temperature and high pressure.

[0074] It should be noted that the solution treatment of the ingot in the heat treatment furnace 203 dissolves various elements in the alloy into the matrix to form a uniform solid solution. Subsequently, aging treatment is carried out to promote the gradual precipitation of solute atoms in the supersaturated solid solution, forming fine and dispersed strengthening phases, further improving the strength, hardness and thermal stability of the alloy. Through this series of strictly controlled heat treatment processes, the performance of the alloy is comprehensively optimized to meet the ideal usage requirements.

[0075] Please refer specifically to Appendix Figure 5 、 7 As shown in 8, a handling unit 8 is provided in the solidification furnace 1 and the processing module 2. The handling unit 8 drives a rotatable mechanical fixture through a lead screw-nut track to transfer the ingot between the crystal pulling unit 6, the cooling unit 201, the thermo-mechanical treatment unit 202 and the heat treatment furnace 203.

[0076] It should be noted that during the entire method process, the handling unit 8 provided in the solidification furnace 1 and the processing module 2 plays an indispensable role. The handling unit 8 drives a rotatable mechanical fixture through a lead screw-nut track, which can accurately and efficiently transfer the ingot between the crystal pulling unit 6, the cooling unit 201, the thermo-mechanical treatment unit 202 and the heat treatment furnace 203, ensuring the tight connection of each method link and improving the production efficiency and the stability of product quality.

[0077] The specific operation process of the present invention is as follows:

[0078] First, according to the required alloy properties, accurately weigh a certain proportion of Ni-based alloy raw materials and Ru targets, and put them into the preheating section through the feed hopper 101 at the top of the solidification furnace 1. The preheating section quickly heats up to 1450 °C and remains stable, and preheats the raw materials for a certain period of time;

[0079] After the preheating is completed, start the electric pusher plate 102 to smoothly push the raw materials into the melting section. Open the electric opening and closing door 104 at the bottom of the melting hopper 103, and the raw materials fall into the melting hopper 103. The electric stirrer 5 inside starts to work to preliminarily stir the raw materials. The composition monitoring unit 3 monitors the Ru content in the melt in real time. Once the monitored Ru content deviates from 1.5 - 3.0 wt%, the automatic feeding unit 4 immediately adds an appropriate amount of Ru target according to the feedback data to ensure the stability of the Ru content;

[0080] Then, according to the alloy performance requirements, set a specific value of the temperature gradient in the gradient solidification section between 0.1 - 50 °C / mm. The crystal pulling unit 6 drives the crucible 7 containing the melt and makes the melt gradually solidify from the high-temperature end to the low-temperature end at a crystal pulling rate of 3 mm / min, guiding the crystal to grow along a specific direction. After a period of time, a single crystal ingot is formed;

[0081] Then, the single crystal ingot is transferred to the cooling unit 201 located in the processing module 2 by the handling unit 8. The high-pressure gas quenching unit 2011 sprays argon with a pressure of 3 MPa from the pipeline onto the ingot, and the cooling rate is stabilized at 10 3 °C / s to rapidly cool the ingot to form a uniformly refined γ / γ' duplex structure; the handling unit 8 moves the cooled ingot to the thermo-mechanical treatment unit 202. The multi-axial stress loading mechanism 2021 applies an axial stress of 5 MPa to the ingot at 1100 °C through electric pressing plates in multiple directions and holds it for 2 h to promote the diffusion of Ru elements into the γ phase and simultaneously form a dense dislocation network. The ingot after stress treatment is transferred to the heat treatment furnace 203 by the handling unit 8. In an argon-protected environment, a solution treatment at 1300 °C for 4 h is first carried out, and then an aging treatment at 900 °C for 24 h is carried out to complete the optimization of the alloy phase structure and improve the comprehensive performance of the alloy;

[0082] Finally, the handling unit 8 transports the alloy ingot out of the processing module 2 through the discharge hatch 9.

[0083] The above has made an exemplary description of the present invention in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An apparatus for a Ru alloyed Ni-based single crystal superalloy, characterized in that including a solidification furnace (1); The furnace body of the solidification furnace (1) is divided into a preheating section, a melting section and a gradient solidification section, and a feed hopper (101) is provided at the top of the solidification furnace (1); An electric push plate (102) is provided in the preheating section of the solidification furnace (1); A melting hopper (103) and a composition monitoring unit (3) are provided in the melting section of the solidification furnace (1). An electric opening and closing door (104) is provided at the bottom of the melting hopper (103), and an electric stirrer (5) is provided in the melting hopper (103); A crystal pulling unit (6) is provided in the gradient solidification section of the solidification furnace (1). A crucible (7) for placing the melt is provided on the crystal pulling unit (6), and the crystal pulling unit (6) is driven by a lead screw and nut transmission structure to drive the crystal solidified in the crucible (7) to grow downward; a processing module (2); A cooling unit (201) is located in the processing module (2). The processing module (2) is connected to one side of the bottom of the solidification furnace (1); The cooling unit (201) is connected to a high-pressure gas quenching unit (2011); A thermomechanical treatment unit (202) is located in the processing module (2). A multi-axis stress loading mechanism (2021) is provided in the thermomechanical treatment unit (202); A heat treatment furnace (203) is located in the processing module (2). The heat treatment furnace (203) is connected to a discharge hatch (9); The composition monitoring unit (3) feeds back the monitoring data to the automatic feeding unit (4) in real time.

2. The device of the Ru alloyed Ni-based single crystal superalloy according to claim 1, characterized in that, The composition monitoring unit (3) adopts an online LIBS composition monitoring system to monitor the Ru content in the melt in real time.

3. The device of the Ru alloyed Ni-based single crystal superalloy according to claim 1, characterized in that, A handling unit (8) is provided in the solidification furnace (1) and the processing module (2). The handling unit (8) transfers the ingot between the crystal pulling unit (6), the cooling unit (201), the thermomechanical treatment unit (202) and the heat treatment furnace (203) through a lead screw and nut track-driven rotatable mechanical fixture.

4. A method for optimizing the phase structure of a Ru-alloyed Ni-based single crystal superalloy, characterized in that, This optimization method uses the device according to any one of claims 1-3, including the following specific steps: SP1. Composition regulation: Put the mixed Ni-based alloy raw material and Ru target into the preheating section of the solidification furnace (1) for preheating. After the preheating is completed, enter the melting section, and then stabilize the Ru content through the composition monitoring unit (3) and the automatic feeding unit (4), and at the same time start the electric stirrer (5) to stir the melt evenly; SP2. Gradient solidification: Heat the gradient solidification section of the solidification furnace (1) according to a preset temperature gradient. At the same time, the crystal pulling unit (6) pulls the crystal to obtain a single crystal ingot; SP3. Cooling gas quenching: Move the ingot into the cooling unit (201) and cool it through the high-pressure gas quenching unit (2011) to form a uniform and refined γ / γ′ duplex structure; SP4. Stress treatment: Move the ingot into the thermomechanical treatment unit (202) for directional stress treatment; SP5. Performance optimization: Transfer the treated ingot to the heat treatment furnace (203) and perform solution treatment and aging treatment in an argon atmosphere in sequence.

5. The method according to claim 4, characterized in that, In SP1, an electric pusher plate (102) is used to push the preheated raw materials into the melting section. The preheating section is rapidly heated to 1450 °C and the temperature is kept stable, providing a stable initial temperature environment for the subsequent melting and solidification processes. Subsequently, an electric stirrer (5) continuously stirs at a frequency of 5 kHz for 30 min, effectively promoting the uniform distribution of Ru elements in the melt and reducing the phenomenon of composition segregation.

6. The method according to claim 4, wherein In SP1, the Ru content in the melt is monitored in real time by a composition monitoring unit (3) with a measurement accuracy of ±0.05 wt%, and the monitoring data is fed back to the automatic feeding unit (4) in real time to keep the Ru content stable at 1.5 - 3.0 wt%.

7. The method according to claim 4, wherein In SP2, the temperature gradient range of the gradient solidification section of the solidification furnace (1) can be flexibly adjusted between 0.1 - 50 °C / mm. The crystal pulling unit (6) drives the crystal solidified in the crucible (7) to grow downward at a crystal pulling rate of 3 mm / min, causing the melt to gradually solidify from the high-temperature end to the low-temperature end and guiding the crystal to grow in a specific direction to form an ingot.

8. The method according to claim 4, wherein In SP3, the high-pressure gas quenching unit (2011) injects argon gas with a pressure of 3 MPa into the ingot from the pipeline, and the cooling rate is stable at 10 3 ℃ / s, which can effectively inhibit the precipitation of TCP phase and refine the γ / γ′ raft structure.

9. The method according to claim 4, characterized in that, In SP4, a multi-axis stress loading mechanism (2021) applies an axial stress of 5 MPa to the ingot at 1100 °C through electric pressing plates in multiple directions and keeps it warm for 2 h, which can promote the diffusion of Ru elements into the γ phase and simultaneously form a dense dislocation network.

10. The method according to claim 4, wherein In SP5, solution treatment and aging treatment are carried out in a heat treatment furnace (203). The solution treatment is to keep it warm at 1300 °C for 4 h in an argon-protected environment, and after the solution treatment, an aging treatment of keeping it warm at 900 °C for 24 h is carried out.

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