A high-precision multi-component micro-alloyed nickel-based alloy slab and a preparation method thereof

Abstract

The application discloses a kind of high-precision multi-group element microalloyed nickel-based alloy slab and preparation method, belong to high-temperature alloy material technical field.The nickel-based alloy slab includes the following mass fraction of raw materials: Cu 16.68~19.76wt%, Pr 0.84~1.57wt%, Se 0.76~1.64wt% and the balance Ni.Raw material includes Pr and Se, by adding rare earth element Pr can purify grain boundary, improve the purity of obtained nickel-based alloy material, also play certain grain refinement effect;Se can form selenide, play the role of self-lubricating in subsequent processing process, reduce the defect caused by friction.And the preparation process of the application adopts the processing mode of double-sided friction stir processing and vacuum diffusion welding, effectively eliminates the surface defects of sintered plate, keeps high continuity in the process of vacuum diffusion welding in thickness direction, obtains the nickel-based alloy material with excellent mechanical properties.

Description

Technical Field

[0001] This invention relates to the field of high-temperature alloy materials technology, and in particular to a high-precision multi-component microalloyed nickel-based alloy slab and its preparation method. Background Technology

[0002] As high-end equipment in fields such as aerospace and energy continues to develop towards higher efficiency, higher reliability, and longer lifespan, more stringent requirements are being placed on the materials used in core hot-end components.

[0003] Nickel-based superalloys are a class of metallic materials that use nickel as a base and are strengthened by adding various alloying elements, thus maintaining excellent mechanical properties and chemical stability under high temperature and harsh stress environments. As key structural materials operating in harsh environments such as high temperature, high pressure, and corrosion, the performance of nickel-based superalloys directly determines the performance ceiling of equipment. Their excellent comprehensive properties make them indispensable key materials in high-end equipment fields such as aerospace, energy and power, and petrochemicals. Nickel-based superalloys are widely used in the manufacture of hot-end components for aero-engines and gas turbines, large-scale power generation, and marine gas turbines, among other applications.

[0004] In order to break through the performance bottleneck of traditional alloys and meet the ever-increasing demands of equipment performance, the performance of nickel-based high-temperature alloy materials is also being continuously improved. Among them, multi-element microalloying is an effective method to improve the mechanical properties of nickel-based alloy materials. It is usually achieved by adding refractory elements such as tungsten, molybdenum, rhenium, and tantalum for solid solution strengthening, thereby significantly improving the temperature resistance and creep resistance of the alloy materials.

[0005] However, nickel-based superalloys inevitably suffer from segregation problems. In order to achieve high-temperature performance or improve mechanical properties, especially after multi-element microalloying, the various high-melting-point and slow-diffusion elements added will be unevenly distributed between dendrites and dendrites during the solidification process of the alloy material due to differences in solubility. This results in dendrite segregation, which leads to embrittlement of the obtained alloy material, causes uneven microstructure, affects the mechanical properties of the material, and reduces the alloy's heat resistance, high-temperature creep strength and creep resistance.

[0006] Therefore, obtaining a nickel-based alloy material and its preparation method that can effectively suppress segregation, ensure the purity of the alloy material, improve the hot working performance of the material, and also have uniform structure, fine grains and high shape accuracy is of great significance for promoting the practical application of advanced high-temperature alloy materials. Summary of the Invention

[0007] This invention provides a high-precision multi-component microalloyed nickel-based alloy slab and its preparation method, which can solve the problems of element segregation and non-metallic oxide inclusions in nickel-based high-temperature alloys in the prior art.

[0008] In a first aspect, the present invention provides a high-precision multi-component micro-alloyed nickel-based alloy slab, comprising the following raw materials by mass fraction: Cu 16.68–19.76 wt%, Pr 0.84–1.57 wt%, Se 0.76–1.64 wt%, and the balance Ni.

[0009] Preferably, the mass relationship between Ni, Cu, Pr and Se in the raw materials satisfies: m(Ni) = 4m(Cu) + 2m(Pr) + 1.2m(Se).

[0010] Preferably, the particle diameters of Ni and Cu in the raw material satisfy the following: .

[0011] Preferably, the particle diameter of Ni in the raw material is 500-600 μm, and the particle diameter of Pr and Se is 50-200 μm.

[0012] More preferably, the particle diameter of Pr and Se is 100 μm.

[0013] By adopting the above technical solution, the nickel-based alloy slab of the present invention comprises Ni, Cu, Pr, and Se as constituent elements. The mechanical properties and processing properties of the alloy material are improved by adjusting the proportions of each component. Among them, the addition of Cu can significantly improve the thermal conductivity and electrical conductivity of the nickel-based alloy, thereby improving thermal properties and reducing high-temperature rheological stress, thus greatly improving the hot working plasticity of the alloy material.

[0014] Secondly, based on traditional nickel-based alloy plates, the nickel-based alloy material obtained in this invention also incorporates trace amounts of Pr and Se. Pr, as an active rare earth element, can purify grain boundaries and improve the purity of the alloy material. Specifically, Pr has high chemical reactivity and can form stable compounds with impurity elements in the nickel-based alloy melt, including oxygen and sulfur. During processing, these compounds float to the slag phase due to density differences and are subsequently removed, thereby reducing the segregation of harmful impurities at the grain boundaries of the alloy material and thus improving the overall purity of the nickel-based alloy plate. Furthermore, the incorporation of Pr can also serve as heterogeneous nucleation sites, promoting grain nucleation during solidification, thereby significantly refining the grain size of the as-cast structure. This provides a uniform and fine initial structure for subsequent hot working, improving hot working performance and enhancing the overall mechanical properties and high-temperature durability of the alloy material.

[0015] The addition of selenium (Se) forms selenides during hot working. These selenides have a layered structure, with weak van der Waals forces binding the layers together. Under frictional shear forces, the layers easily slip, thus reducing the coefficient of friction between the material surface and the processing die, lowering deformation resistance, and minimizing defects such as surface cracking, peeling, or incomplete filling caused by high friction. The self-lubricating effect of Se helps the alloy material flow more uniformly, improving the shape accuracy of the formed nickel-based alloy slab.

[0016] Furthermore, this invention strictly controls the diameter of the raw material particles and the particle size ratio of Ni and Cu particles, which can reduce the difference in sedimentation velocity caused by density differences between different raw materials, thereby making the alloy material more uniformly mixed. Controlling the particle size also further limits the diffusion distance. During hot working, element diffusion is more likely to occur uniformly inside and between the raw material particles, thereby reducing the occurrence of segregation. It can also effectively eliminate the original particle boundaries and improve the overall performance of nickel-based alloy materials.

[0017] Secondly, the present invention provides a method for preparing a high-precision multi-component microalloyed nickel-based alloy slab, which includes the following process steps:

[0018] S1. Clean the surface of the raw materials, weigh the raw materials according to the corresponding mass fraction, and then ball mill them to obtain mixed raw material particles;

[0019] S2. The mixed raw material particles are melted, cast, and forged to obtain raw material plates;

[0020] S3. Perform double-sided stirring and friction processing on the raw material sheet;

[0021] S4. Clean the surface of the processed raw material board obtained in step S3, and then select 5 to 10 raw material boards to stack.

[0022] S5. Vacuum diffusion welding is performed on the stacked raw material plates to obtain metal billets;

[0023] S6. The metal billet is preheated and then subjected to four passes of unidirectional hot rolling to obtain a hot-rolled plate.

[0024] S7. Hot-rolled sheet is annealed and then subjected to three cold rolling processes to obtain cold-rolled sheet;

[0025] S8. Cold-rolled sheet is degreased and cleaned to obtain a high-precision multi-component micro-alloyed nickel-based alloy slab.

[0026] Preferably, in step S2, the forging temperature of the forging billet is 1000-1100℃, and the thickness of the raw material plate is 10-12mm.

[0027] Preferably, in step S3, the double-sided friction stir processing technology includes: the stirring head rotation speed is 700-1000 rpm, the stirring head travel speed is 80-120 mm / min, and the stirring head insertion depth into the raw material plate is 4.17-4.43 mm.

[0028] Preferably, in step S5, the vacuum diffusion welding process includes: a welding temperature of 800–850°C, a heating rate of 10–12°C / min, and a vacuum degree of 10. -3 ~10 -2 Pa, heat preservation time is 5-8 minutes.

[0029] Preferably, in step S6, the preheating temperature is 1000-1200℃, and the unidirectional hot rolling process includes: hot rolling temperature of 1000-1200℃, and reduction of 10-15% per pass.

[0030] Preferably, in step S7, the annealing process includes: an annealing temperature of 1050–1100°C, a holding time of 30–60 min, and a vacuum degree of 10. -3 ~10 -2 Pa; the reduction per pass in the cold rolling process is 20-30%.

[0031] More preferably, in step S4, surface cleaning uses paint or a cleaning cloth to remove surface metal shavings and dust.

[0032] More preferably, the thickness of the hot-rolled plate is 30 to 40 mm.

[0033] More preferably, the thickness of the cold-rolled sheet is 10 to 20 mm.

[0034] During hot working, the raw materials contain Pr and Se. Pr is chemically reactive and easily oxidizes in air, leading to its loss in oxidized form and affecting its role in the alloy material. Se, on the other hand, has a low boiling point and easily volatilizes at high temperatures, making it difficult to stably retain during smelting or prolonged high-temperature processing. Therefore, by adopting the above-mentioned technical solution, the method for preparing high-precision multi-component microalloyed nickel-based alloy slabs provided by this invention employs a fully solid-state processing path. Heat treatment under vacuum conditions can isolate oxygen and reduce the possibility of volatilization. This allows for the complete preservation of the functional properties of easily volatile or oxidized alloying elements while obtaining a fine-grained and oxide-free interface, resulting in a nickel-based alloy slab with excellent strength, toughness, and corrosion resistance.

[0035] Furthermore, the preparation method of this invention employs a combination of double-sided friction stir processing and vacuum diffusion welding, which can effectively suppress segregation and obtain alloy materials with fine and uniform grains. Specifically, on the one hand, the double-sided friction stir processing forms a surface activation layer on the surface of the obtained plate, which can significantly reduce the processing temperature, pressure, and processing time required for subsequent vacuum diffusion welding. This reduces the thermal impact of high temperature and high pressure on alloying elements, especially Pr and Se elements, when they are uniformly distributed, and effectively eliminates surface defects in the sintered plate.

[0036] On the other hand, the microstructure of the plate in the thickness direction is improved after double-sided friction stirring processing. The surface of the plate after processing is fine-grained, and the interior of the plate is also refined to a certain extent due to thermomechanical effects. Then, the processed plates are stacked. During the vacuum diffusion welding process, the microstructure of a single plate and the interface area between plates can be highly continuous, forming a weakened zone without obvious heat-affected zone. This makes the resulting alloy slab have an integral continuous structure in the thickness direction, so that the mechanical properties and corrosion resistance of the resulting alloy slab are highly uniform, avoiding the problem of large performance differences between the core layer and the surface layer of traditional thick plates.

[0037] The beneficial effects of this invention are:

[0038] 1. The high-precision multi-component micro-alloyed nickel-based alloy slab of this invention uses nickel as the base material, with the addition of Pr and Se. The addition of rare earth element Pr can purify grain boundaries, improving the purity of the obtained nickel-based alloy material and also playing a role in refining the grains. Se can form selenides, which act as a self-lubricant in subsequent processing, reducing defects caused by friction. Furthermore, by adjusting the proportions of each component, the mechanical and processing properties of the alloy material are significantly improved, and the occurrence of segregation is reduced.

[0039] 2. The preparation process of the high-precision multi-component micro-alloyed nickel-based alloy slab of the present invention adopts a fully solid-state processing path, which can obtain a fine-grained, oxide-free connection interface while fully preserving the functional characteristics of easily volatile or oxidized alloying elements, thereby improving the consistency of material properties, effectively suppressing segregation, and obtaining a homogenized nickel-based alloy material.

[0040] 3. The preparation process of the high-precision multi-component micro-alloyed nickel-based alloy slab of the present invention adopts a combined processing method of double-sided friction stir processing and vacuum diffusion welding, which can effectively eliminate surface defects of sintered plates, form a dense surface activation layer with fine grains, and maintain a high degree of continuity in the thickness direction during the vacuum diffusion welding process, thereby obtaining nickel-based alloy materials with excellent mechanical properties and high uniformity. Detailed Implementation

[0041] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0042] Example

[0043] Example 1: A high-precision multi-component microalloyed nickel-based alloy slab was prepared according to the following process steps:

[0044] S1. Clean the surface of the raw materials and weigh the raw materials according to the corresponding mass fractions. Specifically, weigh the raw materials according to the mass fractions of Cu 18.96wt%, Pr 1.0wt%, Se 1.0wt%, and the balance Ni. The average particle diameter of Ni is 500μm, the average particle diameter of Cu is 395μm, and the average particle diameter of Pr and Se is 100μm.

[0045] Then, ball milling is performed to obtain mixed raw material particles. The ball milling specifically includes the following steps: the weighed raw material is added to the ball mill, 75% ethanol solution is used as the ball milling medium, stainless steel grinding balls are added, and the mixture is ball milled for 24 hours. Then, the resulting mixed slurry is subjected to rotary evaporation for 20 minutes and vacuum dried at 120℃ for 5 hours to obtain mixed raw material particles.

[0046] S2. The mixed raw material particles are melted and cast, and then forged at 1000℃ to obtain a raw material plate with a thickness of 10mm.

[0047] S3. Perform double-sided stirring friction processing on the raw material sheet. Specifically, fix the raw material sheet on the processing table, and stir and rub both sides of the raw material sheet with a conical stirring head. Control the stirring speed of the stirring head to be 850 rpm, the moving speed of the stirring head to be 100 mm / min, and the insertion depth of the stirring head into the raw material sheet to be 4.2 mm.

[0048] S4. Clean the surface of the processed raw material board obtained in step S3 with a cleaning cloth, and then select 6 raw material boards to stack.

[0049] S5. Perform vacuum diffusion welding on the stacked raw material plates. Specifically, place the stacked raw material plates into a vacuum diffusion furnace, set the welding temperature to 825℃, the heating rate to 12℃ / min, and the vacuum degree to 10. -2 Pa, held at temperature for 6 minutes, and then cooled in the furnace to obtain a metal billet;

[0050] S6. The metal billet is preheated at 1100℃ and then subjected to 4 passes of unidirectional hot rolling, with the hot rolling temperature controlled at 1150℃ and the reduction in each pass being 10%, to obtain a hot-rolled plate.

[0051] S7. The hot-rolled plate is annealed at a temperature of 1050℃ for 45 minutes, and then cold-rolled in three passes. Specifically, the annealed hot-rolled plate is fed into a twin-roll mill along the hot rolling direction for three passes of unidirectional cold rolling, with a reduction of 25% per pass, to obtain the cold-rolled plate.

[0052] S8. Cold-rolled sheet is degreased and cleaned to obtain a high-precision multi-component micro-alloyed nickel-based alloy slab.

[0053] Example 2: A high-precision multi-component micro-alloyed nickel-based alloy slab was prepared according to the following process steps:

[0054] S1. Clean the surface of the raw materials and weigh the raw materials according to the corresponding mass fractions. Specifically, weigh the raw materials according to the mass fractions of Cu 18.86wt%, Pr 0.8wt%, Se 1.5wt%, and the balance Ni. The average particle diameter of Ni is 500μm, the average particle diameter of Cu is 395μm, and the average particle diameter of Pr and Se is 100μm.

[0055] Then, ball milling is performed to obtain mixed raw material particles. The ball milling specifically includes the following steps: the weighed raw material is added to the ball mill, 75% ethanol solution is used as the ball milling medium, stainless steel grinding balls are added, and the mixture is ball milled for 24 hours. Then, the resulting mixed slurry is subjected to rotary evaporation for 20 minutes and vacuum dried at 120℃ for 5 hours to obtain mixed raw material particles.

[0056] S2. The mixed raw material particles are melted and cast, and then forged at 1000℃ to obtain a raw material plate with a thickness of 10mm.

[0057] S3. Perform double-sided stirring friction processing on the raw material sheet. Specifically, fix the raw material sheet on the processing table, and stir and rub both sides of the raw material sheet with a conical stirring head. Control the stirring speed of the stirring head to be 900 rpm, the stirring head travel speed to be 95 mm / min, and the stirring head to be inserted into the raw material sheet to a depth of 4.3 mm.

[0058] S4. Clean the surface of the processed raw material board obtained in step S3 with a cleaning cloth, and then select 7 raw material boards to stack.

[0059] S5. Perform vacuum diffusion welding on the stacked raw material plates. Specifically, place the stacked raw material plates into a vacuum diffusion furnace, set the welding temperature to 820℃, the heating rate to 12℃ / min, and the vacuum degree to 10. -2 Pa, held at temperature for 6 minutes, and then cooled in the furnace to obtain a metal billet;

[0060] S6. The metal billet is preheated at 1000℃ and then subjected to 4 passes of unidirectional hot rolling, with the hot rolling temperature controlled at 1200℃ and the reduction in each pass being 10%, to obtain a hot-rolled plate.

[0061] S7. The hot-rolled plate is annealed at a temperature of 1070℃ for 55 minutes, and then cold-rolled in three passes. Specifically, the annealed hot-rolled plate is fed into a twin-roll mill along the hot rolling direction for three passes of unidirectional cold rolling, with a reduction of 20% per pass, to obtain the cold-rolled plate.

[0062] S8. Cold-rolled sheet is degreased and cleaned to obtain a high-precision multi-component micro-alloyed nickel-based alloy slab.

[0063] Example 3: A high-precision multi-component microalloyed nickel-based alloy slab was prepared according to the following process steps:

[0064] S1. Clean the surface of the raw materials and weigh the raw materials according to the corresponding mass fractions. Specifically, weigh the raw materials according to the mass fractions of Cu 18.79wt%, Pr 1.5wt%, Se 0.7wt%, and the balance Ni. The average particle diameter of Ni is 500μm, the average particle diameter of Cu is 395μm, and the average particle diameter of Pr and Se is 100μm.

[0065] Then, ball milling is performed to obtain mixed raw material particles. The ball milling specifically includes the following steps: the weighed raw material is added to the ball mill, 75% ethanol solution is used as the ball milling medium, stainless steel grinding balls are added, and the mixture is ball milled for 24 hours. Then, the resulting mixed slurry is subjected to rotary evaporation for 20 minutes and vacuum dried at 120℃ for 5 hours to obtain mixed raw material particles.

[0066] S2. The mixed raw material particles are melted and cast, and then forged at 1000℃ to obtain a raw material plate with a thickness of 10mm.

[0067] S3. Perform double-sided stirring friction processing on the raw material sheet. Specifically, fix the raw material sheet on the processing table, and stir and rub both sides of the raw material sheet with a conical stirring head. Control the stirring speed of the stirring head to be 1000 rpm, the stirring head travel speed to be 85 mm / min, and the stirring head to be inserted into the raw material sheet to a depth of 4.4 mm.

[0068] S4. Clean the surface of the processed raw material board obtained in step S3 with a cleaning cloth, and then select 5 raw material boards to stack.

[0069] S5. Perform vacuum diffusion welding on the stacked raw material plates. Specifically, place the stacked raw material plates into a vacuum diffusion furnace, set the welding temperature to 850℃, the heating rate to 12℃ / min, and the vacuum degree to 10.-2 Pa, held at temperature for 8 minutes, and then cooled in the furnace to obtain a metal billet;

[0070] S6. The metal billet is preheated at 1050℃ and then subjected to 4 passes of unidirectional hot rolling, with the hot rolling temperature controlled at 1200℃ and the reduction in each pass being 15%, to obtain a hot-rolled plate.

[0071] S7. The hot-rolled plate is annealed at 1100℃ for 35 minutes, and then cold-rolled in three passes. Specifically, the annealed hot-rolled plate is fed into a twin-roll mill along the hot rolling direction for three passes of unidirectional cold rolling, with a reduction of 30% per pass, to obtain the cold-rolled plate.

[0072] S8. Cold-rolled sheet is degreased and cleaned to obtain a high-precision multi-component micro-alloyed nickel-based alloy slab.

[0073] Comparative Example

[0074] Comparative Example 1 is a high-precision multi-component microalloyed nickel-based alloy slab, which differs from Example 1 only in that the raw materials are weighed according to the mass fractions of Cu 18.96wt%, Se 1.0wt%, and the balance Ni.

[0075] Comparative Example 2: A high-precision multi-component micro-alloyed nickel-based alloy slab was prepared according to the following process steps:

[0076] S1. Clean the surface of the raw materials and weigh the raw materials according to the corresponding mass fractions. Specifically, weigh the raw materials according to the mass fractions of Cu 18.96wt%, Pr 1.0wt%, Se 1.0wt%, and the balance Ni. The average particle diameter of Ni is 500μm, the average particle diameter of Cu is 395μm, and the average particle diameter of Pr and Se is 100μm.

[0077] Then, ball milling is performed to obtain mixed raw material particles. The ball milling specifically includes the following steps: the weighed raw material is added to the ball mill, 75% ethanol solution is used as the ball milling medium, stainless steel grinding balls are added, and the mixture is ball milled for 24 hours. Then, the resulting mixed slurry is subjected to rotary evaporation for 20 minutes and vacuum dried at 120℃ for 5 hours to obtain mixed raw material particles.

[0078] S2. The mixed raw material particles are melted and cast, and then forged at 1000℃ to obtain a raw material plate with a thickness of 10mm.

[0079] S3. Clean the surface of the raw material boards with a cleaning cloth, and then select 6 raw material boards to stack;

[0080] S4. Perform vacuum diffusion welding on the stacked raw material plates. Specifically, place the stacked raw material plates into a vacuum diffusion furnace, set the welding temperature to 825℃, the heating rate to 12℃ / min, and the vacuum degree to 10. -2 Pa, held at temperature for 6 minutes, and then cooled in the furnace to obtain a metal billet;

[0081] S5. The metal billet is preheated at 1100℃ and then subjected to 4 passes of unidirectional hot rolling, with the hot rolling temperature controlled at 1150℃ and the reduction in each pass being 10%, to obtain a hot-rolled plate.

[0082] S6. The hot-rolled plate is annealed at 1050℃ for 45 minutes, and then cold-rolled in three passes. Specifically, the annealed hot-rolled plate is fed into a twin-roll mill along the hot rolling direction for three passes of unidirectional cold rolling, with a reduction of 25% per pass, to obtain the cold-rolled plate.

[0083] S7. Cold-rolled sheet is degreased and cleaned to obtain a high-precision multi-component micro-alloyed nickel-based alloy slab.

[0084] Performance testing

[0085] 1. Strength test: According to the relevant records in GB / T 228.1-2021 "Metallic materials - Tensile testing - Part 1: Test method at room temperature", the tensile strength, yield strength and elongation of the high-precision multi-component microalloyed nickel-based alloy slabs obtained in the examples and comparative examples were tested.

[0086] 2. Hardness test: The hardness of the high-precision multi-component microalloyed nickel-based alloy slabs obtained in the examples and comparative examples was tested according to the relevant records in GB / T 231.1-2018 "Metallic materials - Brinell hardness test - Part 1: Test method".

[0087] The results of the above experiments are shown in Table 1:

[0088] Table 1 Performance test results

[0089]

[0090] According to Table 1, and in conjunction with Example 1 and Comparative Example 1, it can be seen that the performance of Comparative Example 1 is lower than that of Example 1. The reason may be that Pr was not added to the nickel-based alloy slab raw material of Comparative Example 1. Therefore, the effect of purifying grain boundaries and refining grains during processing is greatly reduced, resulting in coarse grains and increased internal defects in the obtained alloy material, which leads to a significant decrease in the mechanical strength and hardness of the material.

[0091] Combining Example 1 and Comparative Example 2, it can be seen that the performance of Comparative Example 2 is also lower than that of Example 1. The reason may be that in Comparative Example 2, the raw material plate was not subjected to double-sided stirring friction treatment before vacuum diffusion welding. As a result, the surface of the raw material plate still retained defects such as oxides, loose layers or pores before welding. This resulted in low bonding strength between the plates during subsequent stacking and welding, ultimately leading to a decrease in the mechanical strength and hardness of the finished plate.

[0092] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A high-precision multi-component micro-alloyed nickel-based alloy slab, characterized in that, The raw materials include the following mass fractions: Cu 16.68–19.76 wt%, Pr 0.84–1.57 wt%, Se 0.76–1.64 wt%, and the balance Ni; The preparation method of the high-precision multi-component microalloyed nickel-based alloy slab includes the following process steps: S1. Clean the surface of the raw materials, weigh the raw materials according to the corresponding mass fraction, and then ball mill them to obtain mixed raw material particles; S2. The mixed raw material particles are melted, cast, and forged to obtain raw material plates; S3. Perform double-sided stirring and friction processing on the raw material sheet; S4. Clean the surface of the processed raw material board obtained in step S3, and then select 5 to 10 raw material boards to stack. S5. Vacuum diffusion welding is performed on the stacked raw material plates to obtain metal billets; S6. The metal billet is preheated and then subjected to four passes of unidirectional hot rolling to obtain a hot-rolled plate; S7. Hot-rolled sheet is annealed and then subjected to three cold rolling processes to obtain cold-rolled sheet; S8. Cold-rolled sheet is degreased and cleaned to obtain a high-precision multi-component micro-alloyed nickel-based alloy slab. In step S3, the processing technology of double-sided friction stir processing includes: the stirring speed of the stirring head is 700-1000 rpm, the stirring head travel speed is 80-120 mm / min, and the stirring head is inserted into the raw material plate to a depth of 4.17-4.43 mm.

2. The high-precision multi-component micro-alloyed nickel-based alloy slab according to claim 1, characterized in that, The mass relationship of Ni, Cu, Pr and Se in the raw materials satisfies: m(Ni) = 4m(Cu) + 2m(Pr) + 1.2m(Se).

3. The high-precision multi-component microalloyed nickel-based alloy slab according to claim 1, characterized in that, The particle diameters of Ni and Cu in the raw material satisfy the following: .

4. The high-precision multi-component microalloyed nickel-based alloy slab according to claim 1, characterized in that, The particle diameter of Ni in the raw materials is 500-600 μm, and the particle diameter of Pr and Se is 50-200 μm.

5. The high-precision multi-component microalloyed nickel-based alloy slab according to claim 1, characterized in that, In step S2, the forging temperature of the forging billet is 1000-1100℃, and the thickness of the raw material plate is 10-12mm.

6. The high-precision multi-component microalloyed nickel-based alloy slab according to claim 1, characterized in that, In step S5, the vacuum diffusion welding process includes: a welding temperature of 800–850°C, a heating rate of 10–12°C / min, and a vacuum degree of 10. -3 ~10 -2 Pa, heat preservation time is 5-8 minutes.

7. The high-precision multi-component microalloyed nickel-based alloy slab according to claim 1, characterized in that, In step S6, the preheating temperature is 1000-1200℃, and the unidirectional hot rolling process includes: hot rolling temperature of 1000-1200℃, and reduction of 10-15% per pass.

8. The high-precision multi-component microalloyed nickel-based alloy slab according to claim 1, characterized in that, In step S7, the annealing process includes: an annealing temperature of 1050–1100℃, a holding time of 30–60 min, and a vacuum degree of 10. -3 ~10 -2 Pa; the reduction per pass in the cold rolling process is 20-30%.

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