Nickel-based corrosion-resistant alloy and preparation method thereof

Abstract

The invention discloses a nickel-based corrosion-resistant alloy and a preparation method thereof, and relates to the technical field of alloy preparation, and the nickel-based corrosion-resistant alloy comprises the following elements by weight: 22-25 wt% of Cr; 8 to 10 weight percent of Mo; 1 to 3 wt% of Fe; 1.8 to 3.5 wt% of Cu; 0.5 to 1.2 wt% of Al; 0.3 to 0.8 wt% of Ti; 1.5 to 3.5 wt% of W; b: 0.002 wt% to 0.01 wt%; y: 0.02 to 0.12 wt%; ce: 0.02 to 0.07 wt%; and Ni: the balance. The corrosion-resistant nickel-based alloy has the effect of improving the corrosion resistance of the nickel-based alloy by combining multi-element alloying and a fine preparation process.

Description

Technical Field

[0001] The invention relates to the technical field of alloy preparation, and in particular to a nickel-based corrosion-resistant alloy and a preparation method thereof. Background Art

[0002] Although traditional nickel-based alloys have good corrosion resistance and high temperature performance, their performance still needs to be improved in some extreme environments, such as high salinity, high acidity or high temperature atmospheres. Especially in the fields of petrochemicals, marine engineering and nuclear reactors, the corrosion resistance and high temperature performance of materials are particularly critical. Therefore, it is necessary to develop a new type of nickel-based alloy to meet the application requirements in these harsh environments. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention aims to provide a nickel-based corrosion-resistant alloy and a preparation method thereof.

[0004] The above object of the present invention is achieved through the following technical solutions: A nickel-based corrosion-resistant alloy comprising the following elements in percentage by weight: Cr: 22-25wt%; Mo: 8-10wt%; Fe: 1-3wt%; Cu: 1.8-3.5wt%; Al: 0.5-1.2wt%; Ti: 0.3-0.8wt%; W: 1.5-3.5wt%; B: 0.002-0.01wt%; Y: 0.02-0.12wt%; Ce: 0.02-0.07wt%; Ni: Residue.

[0005] The alloy of the present invention adds 22-25wt% chromium (Cr) and 8-10wt% molybdenum (Mo) to form a stable passivation film, which can effectively improve the corrosion resistance of the alloy in a high-temperature oxidizing environment. The addition of molybdenum can especially enhance the performance of resistance to pitting and crevice corrosion, and is suitable for harsh working conditions in acidic media and high-temperature atmospheres. In addition, the synergistic effect of chromium and molybdenum can reduce oxide film defects and improve the stability against high-temperature corrosion. The addition of a small amount of tungsten (W, 1.5-3.5wt%) further enhances the chemical stability of the alloy in a high-temperature oxidizing and corrosive environment. The rare earth elements yttrium (Y, 0.02-0.12wt%) and cerium (Ce, 0.02-0.07wt%) optimize the oxide film structure of the alloy and enhance its oxidation resistance in a high-temperature environment.

[0006] Adding 1.8-3.5wt% copper (Cu) significantly improves the alloy's ability to resist chloride ion corrosion. Copper can inhibit the diffusion of chloride ions and the occurrence of localized corrosion, especially in marine or chloride-containing corrosive environments, showing excellent resistance to stress corrosion cracking. At the same time, the synergistic effect of molybdenum and tungsten improves the alloy's corrosion resistance in chlorine-containing acidic media and extends its service life in harsh environments.

[0007] By introducing 0.5-1.2wt% aluminum (Al) and 0.3-0.8wt% titanium (Ti), precipitation strengthening phases (such as γ' or Ni3(Al,Ti)) are formed in the alloy, which significantly improves the strength and hardness of the material while maintaining good toughness. The appropriate amount of iron (Fe, 1-3wt%) improves the plasticity and impact resistance while maintaining the high strength of the alloy, ensuring the reliability of the material under harsh conditions.

[0008] The addition of trace boron (B, 0.002-0.01wt%) improves the grain boundary strength of the alloy and reduces the stress concentration and corrosion risk at the grain boundary. Rare earth elements yttrium and cerium can refine the grains and enhance the stability of the grain boundaries, thereby improving the material's high-temperature creep resistance and fatigue resistance.

[0009] Furthermore, niobium element is included, and the weight percentage of the niobium element is 0.8-1.8wt%.

[0010] The introduction of niobium can form a stable Ni3 (Al, Ti, Nb) precipitation phase with aluminum and titanium, further improving the strength and hardness of the alloy. At the same time, the thermal stability of this precipitation phase enables the material to maintain excellent mechanical properties under high temperature conditions, which is particularly suitable for high-temperature equipment and structural parts. Niobium can effectively inhibit the slip and expansion of grain boundaries, reduce creep deformation in high temperature environments, and thus increase the high-temperature service life of the alloy. This improvement is particularly important for workpieces that are exposed to high temperature and high stress environments for a long time. The trace segregation of niobium at the grain boundaries can inhibit the corrosion sensitivity of grain boundary precipitates, further improving the corrosion resistance of the alloy in acidic media. At the same time, the combined action of niobium, molybdenum and tungsten enhances the ability to resist pitting and crevice corrosion, making the alloy perform better in chlorine-containing environments.

[0011] Furthermore, the weight percentage of the molybdenum element is 9-10wt%; the weight percentage of the tungsten element is 3-3.5wt%.

[0012] A higher content of molybdenum (9-10wt%) further enhances the resistance to pitting and crevice corrosion, making the alloy perform better in strong acidic and chloride-containing environments. High molybdenum content can also enhance the stability of the passivation film and reduce the risk of localized corrosion. The increase in tungsten content (3-3.5wt%) significantly enhances the strength of the alloy under high temperature conditions. The high melting point and strengthening effect of tungsten enable the material to withstand higher mechanical stresses in high temperature environments, making it particularly suitable for high temperature and high pressure conditions.

[0013] Furthermore, the weight percentage of the yttrium element is 0.08-0.12wt%; the weight percentage of the cerium element is 0.05-0.07wt%.

[0014] Higher contents of yttrium and cerium can further improve the compactness and uniformity of the oxide film, significantly enhancing the corrosion resistance of the alloy in high-temperature oxidizing environments. These rare earth elements reduce the risk of oxide spalling by inhibiting crack propagation in the oxide film. Yttrium and cerium can refine the grains and form a stabilizing effect at the grain boundaries, reducing the corrosion sensitivity caused by grain boundary precipitates, and are particularly suitable for long-term use scenarios in high-temperature corrosive media.

[0015] Furthermore, it also includes zirconium element, and the weight percentage of the zirconium element is 0.01-0.1wt%.

[0016] Zirconium can effectively reduce the tendency of grain boundary precipitates to form, inhibit the sensitivity of grain boundary corrosion, and enhance the bonding strength of grain boundaries, thereby improving the reliability of the alloy in harsh environments. The addition of zirconium optimizes the anti-oxidation film structure of the alloy, further improving the stability and durability of the material in high-temperature oxidizing environments. The addition of trace zirconium significantly prolongs the fatigue life of the material in high-temperature and high-stress environments, while maintaining excellent corrosion resistance, making it suitable for key equipment components under extreme conditions.

[0017] A method for preparing a nickel-based corrosion-resistant alloy comprises the following steps: S1: precision melting step; The precise melting step includes three steps: vacuum induction melting of raw materials, vacuum arc remelting and precise furnace cooling control; S2: directional solidification control step; The directional solidification control step includes a heating stage, a first cooling and solidification stage, and a second cooling and solidification stage, wherein the cooling rate of the first cooling and solidification stage is lower than the cooling rate of the second cooling and solidification stage; S3: variable temperature multi-stage heat treatment step; The variable temperature multi-stage heat treatment step includes a solution treatment, a first aging treatment stage, and a second aging treatment stage.

[0018] Through the above preparation method, the process design of vacuum induction melting combined with vacuum arc remelting ensures the uniformity and purity of the alloy composition. The directional solidification control step forms a columnar crystal structure through staged cooling and solidification, which significantly improves the creep resistance and mechanical properties of the alloy. The variable temperature multi-stage heat treatment optimizes the structure and properties of the alloy through solution treatment and two-stage aging treatment, thereby achieving the optimization of the alloy structure and the improvement of performance.

[0019] Furthermore, the specific operation of the S1 precision smelting step is as follows: S1.1 Vacuum induction melting of raw materials: ① at 1400-1450℃, keep for 10 -2 Pa low-pressure argon gas is used to pre-melt the Ni matrix; ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1500-1550℃, and chromium, molybdenum, tungsten, and niobium elements are added in order from high melting point to low melting point; ③ After the elements are fully melted, iron and copper elements are added at a temperature of 1550℃; ④ After the elements are fully melted, the melting temperature is reduced to 1500-1520℃, and aluminum and titanium elements are added; ⑤ After they are completely melted, the melting temperature is controlled to 1400-1450℃, and yttrium, cerium, zirconium, and boron elements are added; ⑥ After they are completely melted, the melting temperature is controlled to 1500-1550℃, and the temperature is kept for 10 minutes, and the melting temperature is cooled to 1400℃ at a low speed of 3-5℃ / min, and then quickly cooled to 500-600℃ at a speed of 20-30℃ / min; S1.2 Vacuum arc remelting: vacuum induction melted ingots are subjected to vacuum arc remelting under the conditions of controlling the melting current to 6-8kA, melting speed to 10-15mm / min, and vacuum degree to 0.5-1Pa to obtain remelted ingots, which are directly transferred to furnace cooling at a temperature higher than 1000°C; S1.3 Furnace cooling control: first slowly cool the remelted ingot to 1000°C at 2-5°C / min; then quickly cool it to 500°C at 20-30°C / min.

[0020] The priority addition of high melting point elements such as chromium, molybdenum, tungsten, and niobium, combined with strict temperature control (1500-1550°C), ensures that these elements are completely dissolved and reduces microsegregation. In particular, tungsten and molybdenum tend to form complex intermediate phases at high temperatures. If the temperature is insufficient or the order of addition is improper, these intermediate phases may be stabilized, thereby affecting the performance of the alloy. The subsequent addition of rare earth elements (yttrium, cerium) and zirconium and boron significantly enhances the grain refinement effect by reacting with the molten metal matrix. Yttrium and cerium help capture impurities and oxides, while zirconium and boron further optimize high temperature performance and oxidation resistance by forming composite phases with the iron matrix.

[0021] The vacuum arc remelting step effectively eliminates the macro-segregation in the previous step by finely controlling the melting current (6-8kA) and melting speed (10-15mm / min), reduces the number of inclusions, and refines the grain structure. The uniform structure formed during the remelting process provides a basis for the stable growth of columnar crystals in the directional solidification step. The arc energy input of the remelting combined with the stability of the molten pool enables the ingot to form a denser structure, especially in the distribution of high melting point elements (such as molybdenum and tungsten), which has been significantly improved. The furnace cooling control after melting (slow cooling to 1000℃ at 2-5℃ / min, rapid cooling to 500℃ at 20-30℃ / min) further optimizes the distribution of molybdenum, tungsten and rare earth elements in the matrix, avoiding the premature formation of precipitation phases.

[0022] The precise temperature control strategy during the furnace cooling stage (slow cooling to 1000°C at 2-5°C / min, followed by rapid cooling to 500°C at 20-30°C / min) further highlights its importance. The main function of the slow cooling stage is to eliminate thermal stress within the crystal, while allowing high-melting-point elements (such as molybdenum and tungsten) to gradually diffuse into the alloy matrix to form a uniform distribution. Rapid cooling inhibits the formation of low-temperature precipitation phases, while locking in the synergistic strengthening effect of rare earth elements and the matrix, ensuring both high-temperature strength and low-temperature toughness. In addition, the presence of rare earth elements can passivate grain boundaries and reduce grain boundary oxidation, thereby further improving the creep resistance of the material.

[0023] Furthermore, the specific operation of the S2 directional solidification control step is as follows: S2.1 Heating stage: heat the ingot from 500°C to 1500-1550°C at 3-5°C / min; S2.2 The first cooling and solidification stage: the ingot is cooled to 1200°C at a low speed of 2-5°C / min, and the ingot is pulled at a speed of 0.1-1mm / min; S2.3 Second cooling and solidification stage: The ingot is rapidly cooled to 800°C at 20-30°C / min.

[0024] By heating to 1500-1550℃ at 3-5℃ / min, the accumulation of thermal stress inside the ingot due to excessive temperature gradient can be avoided, ensuring uniform temperature distribution and creating a uniform molten pool environment for subsequent directional solidification. The high-temperature heating stage allows the initial precipitation phase (such as brittle compounds) that may exist on the grain boundary to re-melt, laying the foundation for the stable growth of columnar crystals during directional solidification.

[0025] At low cooling rates, the diffusion of solutes in the liquid metal is fully adjusted, which is conducive to the growth of columnar crystals along the directional pulling direction, while reducing the chemical composition segregation between dendrites. The pulling speed is controlled at 0.1-1mm / min, which can promote the preferred orientation growth of grains and avoid the formation of equiaxed crystals, thereby improving the high temperature creep resistance and grain boundary strength of the material.

[0026] Rapid cooling suppresses the non-uniform precipitation of the second phase by compressing the diffusion rate of elements at the grain boundary. At the same time, it retains the high-temperature solid solution state structure, reduces the formation of brittle precipitates near the grain boundary, and further optimizes the efficiency of subsequent heat treatment.

[0027] Furthermore, the S3 variable temperature multi-stage heat treatment step is specifically performed as follows: S3.1 Solution treatment: heat the ingot to 1120-1160℃ at a rate of 3-5℃ / min, keep it at this temperature for 2-4 hours, and immediately perform oil quenching and rapid cooling; S3.2 First aging treatment stage: heat the ingot to 850-900°C at a rate of 3-5°C / min, keep it at that temperature for 8-12 hours, and then cool it to room temperature at a rate of 5-10°C / min; S3.3 Second aging treatment stage: heat the ingot to 700-750°C at a rate of 3-5°C / min, keep it at that temperature for 6-10 hours, and then cool it to room temperature at a rate of 5-10°C / min.

[0028] At high temperatures of 1120-1160°C, carbides and other low-temperature precipitated phases (such as Laves phase or σ phase) can be fully dissolved, greatly improving the chemical uniformity of the matrix. This process reduces the microsegregation problem inside the material and provides a uniform element distribution basis for subsequent aging treatment.

[0029] Keeping at 1120-1160℃ for 2-4 hours can fully dissolve carbides and other low-temperature precipitation phases, optimize matrix uniformity, and create ideal conditions for aging treatment. Rapid oil quenching avoids the regeneration of precipitates at high temperatures. By keeping at 850-900℃ for a long time (8-12 hours), the γ′ phase is fully precipitated, significantly improving the high-temperature strength and creep resistance of the alloy. Keeping at 700-750℃ (6-10 hours) optimizes the morphology of the precipitated phase, further improving the toughness and fatigue resistance, and giving the material more balanced mechanical properties. Slow cooling to room temperature ensures the release of thermal stress and structural stability.

[0030] Compared with the prior art, the beneficial effects of the present invention are mainly reflected in the following aspects: 1. The nickel-based alloy of the present invention forms an optimized passivation film and microstructure by combining well-designed alloy components (such as the addition of molybdenum, tungsten, niobium and rare earth elements yttrium and cerium) with processes, which significantly improves the corrosion resistance and durability in high temperature and corrosive environments. This feature makes the alloy particularly suitable for harsh environments such as marine, petrochemical and nuclear energy. The copper element in the alloy significantly improves the ability to resist chloride ion corrosion, while the synergistic effect of chromium and molybdenum further improves the stability of the alloy in acidic and chlorine-containing environments. This synergistic effect between elements enables the nickel-based alloy of the present invention to exhibit excellent performance in various corrosive environments.

[0031] 2. Through precise melting and directional solidification technology, the alloy preparation process precisely controls the crystal growth and the formation of precipitation phase, thereby optimizing the high temperature strength and creep resistance of the material. This process innovation ensures the stability and reliability of the material in long-term high temperature applications.

[0032] 3. Through reasonable element ratio and preparation process, the high temperature strength and low temperature toughness of the alloy are optimized at the same time. In particular, the high content of molybdenum and tungsten combined with the use of copper and niobium significantly improves the alloy's resistance to pitting and crevice corrosion, making the alloy perform well in corrosive environments such as chlorine. DETAILED DESCRIPTION

[0033] The present invention is described in detail below in conjunction with embodiments.

[0034] Example 1 Example 1 discloses a method for preparing a nickel-based corrosion-resistant alloy, wherein the raw materials are configured in the following weight percentages: Chromium (Cr): 23.5wt%; Molybdenum (Mo): 8.5wt%; Iron (Fe): 2.5wt%; Copper (Cu): 3.0wt%; Aluminum (Al): 0.8wt%; Titanium (Ti): 0.5wt%; Tungsten (W): 2.5wt%; Boron (B): 0.005wt%; Yttrium (Y): 0.05wt%; Cerium (Ce): 0.04wt%; Nickel (Ni): Balance.

[0035] The preparation steps are as follows: S1: Precision Melting Steps S1.1 Vacuum induction melting raw materials: ① At 1400℃, keep 10 -2Pre-melt the Ni matrix in a low-pressure argon environment; ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1550°C, and chromium, molybdenum, and tungsten elements are added in sequence and stirred until fully melted; ③ Add iron and copper at 1550℃ and continue stirring until fully melted; ④ Lower the melting temperature to 1520℃, add aluminum and titanium elements, and stir evenly; ⑤ Reduce the temperature to 1450℃ and add yttrium, cerium and boron; ⑥ Control the melting temperature to 1550℃, keep it warm for 10 minutes, cool it to 1400℃ at 5℃ / min, and then quickly cool it to 600℃ at 30℃ / min.

[0036] S1.2 Vacuum Arc Remelting: The ingot obtained by vacuum induction melting was placed in a vacuum arc furnace under the following conditions: melting current 7kA, melting speed 12mm / min, vacuum degree 0.8Pa. The remelted ingot was directly transferred to furnace cooling at a temperature above 1000℃.

[0037] S1.3 Furnace cooling control: The remelted ingot was slowly cooled to 1000°C at 2°C / min, and then rapidly cooled to 500°C at 30°C / min.

[0038] S2: Directional solidification control step S2.1 Heating stage: The ingot was heated from 500°C to 1520°C at 3°C / min.

[0039] S2.2 The first cooling and solidification stage: The ingot was cooled to 1200°C at 2°C / min and pulled at 0.5mm / min to control the cooling and crystallization to be uniform.

[0040] S2.3 Second cooling and solidification stage: The ingot was rapidly cooled to 800°C at 25°C / min.

[0041] S3: variable temperature multi-stage heat treatment step S3.1 Solution treatment: The ingot was heated to 1140°C at 4°C / min, kept at this temperature for 3 hours, and then oil quenched.

[0042] S3.2 The first aging treatment stage: The ingot was heated to 875°C at 4°C / min, kept at that temperature for 10 hours, and then cooled to room temperature at 7°C / min.

[0043] S3.3 The second aging treatment stage: The ingot was heated to 725°C at 4°C / min, kept at that temperature for 8 hours, and then cooled to room temperature at 7°C / min.

[0044] Example 2 Example 2 discloses a method for preparing a nickel-based corrosion-resistant alloy, wherein the raw materials are configured as follows by weight percentage: Chromium (Cr): 23.5wt%; Molybdenum (Mo): 9.5wt%; Iron (Fe): 2.5wt%; Copper (Cu): 3.0wt%; Aluminum (Al): 0.8wt%; Titanium (Ti): 0.5wt%; Tungsten (W): 3.5wt%; Boron (B): 0.005wt%; Yttrium (Y): 0.05wt%; Cerium (Ce): 0.04wt%; Nickel (Ni): Balance.

[0045] The preparation steps are as follows: S1: Precision Melting Steps S1.1 Vacuum induction melting raw materials: ① At 1400℃, keep 10 -2 Pre-melt the Ni matrix in a low-pressure argon environment; ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1550°C, and chromium, molybdenum, and tungsten elements are added in sequence and stirred until fully melted; ③ Add iron and copper at 1550℃ and continue stirring until fully melted; ④ Lower the melting temperature to 1520℃, add aluminum and titanium elements, and stir evenly; ⑤ Reduce the temperature to 1450℃ and add yttrium, cerium and boron; ⑥ Control the melting temperature to 1550℃, keep it warm for 10 minutes, cool it to 1400℃ at 5℃ / min, and then quickly cool it to 600℃ at 30℃ / min.

[0046] S1.2 Vacuum Arc Remelting: The ingot obtained by vacuum induction melting was placed in a vacuum arc furnace under the following conditions: melting current 7kA, melting speed 12mm / min, vacuum degree 0.8Pa. The remelted ingot was directly transferred to furnace cooling at a temperature above 1000℃.

[0047] S1.3 Furnace cooling control: The remelted ingot was slowly cooled to 1000°C at 2°C / min, and then rapidly cooled to 500°C at 20°C / min.

[0048] S2: Directional solidification control step S2.1 Heating stage: The ingot was heated from 500°C to 1520°C at 3°C / min.

[0049] S2.2 The first cooling and solidification stage: The ingot was cooled to 1200°C at 2°C / min and pulled at 0.5mm / min to control the cooling and crystallization to be uniform.

[0050] S2.3 Second cooling and solidification stage: The ingot was rapidly cooled to 800°C at 25°C / min.

[0051] S3: variable temperature multi-stage heat treatment step S3.1 Solution treatment: The ingot was heated to 1140°C at 4°C / min, kept at this temperature for 3 hours, and then oil quenched.

[0052] S3.2 The first aging treatment stage: The ingot was heated to 875°C at 4°C / min, kept at that temperature for 10 hours, and then cooled to room temperature at 7°C / min.

[0053] S3.3 The second aging treatment stage: The ingot was heated to 725°C at 4°C / min, kept at that temperature for 8 hours, and then cooled to room temperature at 7°C / min.

[0054] Example 3 Example 3 discloses a method for preparing a nickel-based corrosion-resistant alloy, wherein the raw materials are configured as follows by weight percentage: Chromium (Cr): 23.5wt%; Molybdenum (Mo): 8.5wt%; Iron (Fe): 2.5wt%; Copper (Cu): 3.0wt%; Aluminum (Al): 0.8wt%; Titanium (Ti): 0.5wt%; Tungsten (W): 2.5wt%; Boron (B): 0.005wt%; Yttrium (Y): 0.1wt%; Cerium (Ce): 0.06wt%; Nickel (Ni): Balance.

[0055] The preparation steps are as follows: S1: Precision Melting Steps S1.1 Vacuum induction melting raw materials: ① At 1400℃, keep 10 -2 Pre-melt the Ni matrix in a low-pressure argon environment; ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1550°C, and chromium, molybdenum, and tungsten elements are added in sequence and stirred until fully melted; ③ Add iron and copper at 1550℃ and continue stirring until fully melted; ④ Lower the melting temperature to 1520℃, add aluminum and titanium elements, and stir evenly; ⑤ Reduce the temperature to 1450℃ and add yttrium, cerium and boron; ⑥ Control the melting temperature to 1550℃, keep it warm for 10 minutes, cool it to 1400℃ at 3℃ / min, and then quickly cool it to 600℃ at 30℃ / min.

[0056] S1.2 Vacuum Arc Remelting: The ingot obtained by vacuum induction melting was placed in a vacuum arc furnace under the following conditions: melting current 7kA, melting speed 12mm / min, vacuum degree 0.8Pa. The remelted ingot was directly transferred to furnace cooling at a temperature above 1000℃.

[0057] S1.3 Furnace cooling control: The remelted ingot was slowly cooled to 1000°C at 2°C / min, and then rapidly cooled to 500°C at 30°C / min.

[0058] S2: Directional solidification control step S2.1 Heating stage: The ingot was heated from 500°C to 1520°C at 3°C / min.

[0059] S2.2 The first cooling and solidification stage: The ingot was cooled to 1200°C at 2°C / min and pulled at 0.5mm / min to control the cooling and crystallization to be uniform.

[0060] S2.3 Second cooling and solidification stage: The ingot was rapidly cooled to 800°C at 25°C / min.

[0061] S3: variable temperature multi-stage heat treatment step S3.1 Solution treatment: The ingot was heated to 1140°C at 4°C / min, kept at this temperature for 3 hours, and then oil quenched.

[0062] S3.2 The first aging treatment stage: The ingot was heated to 875°C at 4°C / min, kept at that temperature for 10 hours, and then cooled to room temperature at 7°C / min.

[0063] S3.3 The second aging treatment stage: The ingot was heated to 725°C at 4°C / min, kept at that temperature for 8 hours, and then cooled to room temperature at 7°C / min.

[0064] Example 4 Example 4 discloses a method for preparing a nickel-based corrosion-resistant alloy, wherein the raw materials are configured in the following weight percentages: Chromium (Cr): 23.5wt%; Molybdenum (Mo): 9.5wt%; Iron (Fe): 2.5wt%; Copper (Cu): 3.0wt%; Aluminum (Al): 0.8wt%; Titanium (Ti): 0.5wt%; Tungsten (W): 3.5wt%; Boron (B): 0.005wt%; Yttrium (Y): 0.1wt%; Cerium (Ce): 0.06wt%; Nickel (Ni): Balance.

[0065] The preparation steps are as follows: S1: Precision Melting Steps S1.1 Vacuum induction melting raw materials: ① At 1400℃, keep 10 -2 Pre-melt the Ni matrix in a low-pressure argon environment; ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1550°C, and chromium, molybdenum, and tungsten elements are added in sequence and stirred until fully melted; ③ Add iron and copper at 1550℃ and continue stirring until fully melted; ④ Lower the melting temperature to 1520℃, add aluminum and titanium elements, and stir evenly; ⑤ Reduce the temperature to 1450℃ and add yttrium, cerium and boron; ⑥ Control the melting temperature to 1550℃, keep it warm for 10 minutes, cool it to 1400℃ at 3℃ / min, and then quickly cool it to 600℃ at 30℃ / min.

[0066] S1.2 Vacuum Arc Remelting: The ingot obtained by vacuum induction melting was placed in a vacuum arc furnace under the following conditions: melting current 7kA, melting speed 12mm / min, vacuum degree 0.8Pa. The remelted ingot was directly transferred to furnace cooling at a temperature above 1000℃.

[0067] S1.3 Furnace cooling control: The remelted ingot was slowly cooled to 1000°C at 2°C / min, and then rapidly cooled to 500°C at 30°C / min.

[0068] S2: Directional solidification control step S2.1 Heating stage: The ingot was heated from 500°C to 1520°C at 3°C / min.

[0069] S2.2 The first cooling and solidification stage: The ingot was cooled to 1200°C at 2°C / min and pulled at 0.5mm / min to control the cooling and crystallization to be uniform.

[0070] S2.3 Second cooling and solidification stage: The ingot was rapidly cooled to 800°C at 25°C / min.

[0071] S3: variable temperature multi-stage heat treatment step S3.1 Solution treatment: The ingot was heated to 1140°C at 4°C / min, kept at this temperature for 3 hours, and then oil quenched.

[0072] S3.2 The first aging treatment stage: The ingot was heated to 875°C at 4°C / min, kept at that temperature for 10 hours, and then cooled to room temperature at 7°C / min.

[0073] S3.3 The second aging treatment stage: The ingot was heated to 725°C at 4°C / min, kept at that temperature for 8 hours, and then cooled to room temperature at 7°C / min.

[0074] Example 5 Example 5 discloses a method for preparing a nickel-based corrosion-resistant alloy, wherein the raw materials are configured in the following weight percentages: Chromium (Cr): 23.5wt%; Molybdenum (Mo): 9.5wt%; Iron (Fe): 2.5wt%; Copper (Cu): 3.0wt%; Aluminum (Al): 0.8wt%; Titanium (Ti): 0.5wt%; Tungsten (W): 3.5wt%; Boron (B): 0.005wt%; Yttrium (Y): 0.1wt%; Cerium (Ce): 0.06wt%; Niobium (Nb): 0.9wt%; Nickel (Ni): Balance.

[0075] The preparation steps are as follows: S1: Precision Melting Steps S1.1 Vacuum induction melting raw materials: ① At 1400℃, keep 10 -2 Pre-melt the Ni matrix in a low-pressure argon environment; ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1550°C, and chromium, molybdenum, tungsten and niobium elements are added in sequence and stirred until fully melted; ③ Add iron and copper at 1550℃ and continue stirring until fully melted; ④ Lower the melting temperature to 1520℃, add aluminum and titanium elements, and stir evenly; ⑤ Reduce the temperature to 1450℃ and add yttrium, cerium and boron; ⑥ Control the melting temperature to 1550℃, keep it warm for 10 minutes, cool it to 1400℃ at 5℃ / min, and then quickly cool it to 600℃ at 30℃ / min.

[0076] S1.2 Vacuum Arc Remelting: The ingot obtained by vacuum induction melting was placed in a vacuum arc furnace under the following conditions: melting current 7kA, melting speed 12mm / min, vacuum degree 0.8Pa. The remelted ingot was directly transferred to furnace cooling at a temperature above 1000℃.

[0077] S1.3 Furnace cooling control: The remelted ingot was slowly cooled to 1000°C at 2°C / min, and then rapidly cooled to 500°C at 30°C / min.

[0078] S2: Directional solidification control step S2.1 Heating stage: The ingot was heated from 500°C to 1520°C at 3°C / min.

[0079] S2.2 The first cooling and solidification stage: The ingot was cooled to 1200°C at 2°C / min and pulled at 0.5mm / min to control the cooling and crystallization to be uniform.

[0080] S2.3 Second cooling and solidification stage: The ingot was rapidly cooled to 800°C at 25°C / min.

[0081] S3: variable temperature multi-stage heat treatment step S3.1 Solution treatment: The ingot was heated to 1140°C at 4°C / min, kept at this temperature for 3 hours, and then oil quenched.

[0082] S3.2 The first aging treatment stage: The ingot was heated to 875°C at 4°C / min, kept at that temperature for 10 hours, and then cooled to room temperature at 7°C / min.

[0083] S3.3 The second aging treatment stage: The ingot was heated to 725°C at 4°C / min, kept at that temperature for 8 hours, and then cooled to room temperature at 7°C / min.

[0084] Example 6 Example 6 discloses a method for preparing a nickel-based corrosion-resistant alloy, wherein the raw materials are configured as follows by weight percentage: Chromium (Cr): 23.5wt%; Molybdenum (Mo): 9.5wt%; Iron (Fe): 2.5wt%; Copper (Cu): 3.0wt%; Aluminum (Al): 0.8wt%; Titanium (Ti): 0.5wt%; Tungsten (W): 3.5wt%; Boron (B): 0.005wt%; Yttrium (Y): 0.1wt%; Cerium (Ce): 0.06wt%; Niobium (Nb): 0.9wt%; Zirconium (Zr): 0.05wt%; Nickel (Ni): Balance.

[0085] The preparation steps are as follows: S1: Precision Melting Steps S1.1 Vacuum induction melting raw materials: ① At 1400℃, keep 10 -2 Pre-melt the Ni matrix in a low-pressure argon environment; ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1550°C, and chromium, molybdenum, tungsten and niobium elements are added in sequence and stirred until fully melted; ③ Add iron and copper at 1550℃ and continue stirring until fully melted; ④ Lower the melting temperature to 1520℃, add aluminum and titanium elements, and stir evenly; ⑤ Reduce the temperature to 1450℃ and add yttrium, cerium, zirconium and boron elements; ⑥ Control the melting temperature to 1550℃, keep it warm for 10 minutes, cool it to 1400℃ at 5℃ / min, and then quickly cool it to 600℃ at 30℃ / min.

[0086] S1.2 Vacuum Arc Remelting: The ingot obtained by vacuum induction melting was placed in a vacuum arc furnace under the following conditions: melting current 7kA, melting speed 12mm / min, vacuum degree 0.8Pa. The remelted ingot was directly transferred to furnace cooling at a temperature above 1000℃.

[0087] S1.3 Furnace cooling control: The remelted ingot was slowly cooled to 1000°C at 2°C / min, and then rapidly cooled to 500°C at 30°C / min.

[0088] S2: Directional solidification control step S2.1 Heating stage: The ingot was heated from 500°C to 1520°C at 3°C / min.

[0089] S2.2 The first cooling and solidification stage: The ingot was cooled to 1200°C at 2°C / min and pulled at 0.5mm / min to control the cooling and crystallization to be uniform.

[0090] S2.3 Second cooling and solidification stage: The ingot was rapidly cooled to 800°C at 25°C / min.

[0091] S3: variable temperature multi-stage heat treatment step S3.1 Solution treatment: The ingot was heated to 1140°C at 4°C / min, kept at this temperature for 3 hours, and then oil quenched.

[0092] S3.2 The first aging treatment stage: The ingot was heated to 875°C at 4°C / min, kept at that temperature for 10 hours, and then cooled to room temperature at 7°C / min.

[0093] S3.3 The second aging treatment stage: The ingot was heated to 725°C at 4°C / min, kept at that temperature for 8 hours, and then cooled to room temperature at 7°C / min.

[0094] The difference between Example 7 and Example 6 is that some process parameters in the preparation steps are set differently. The specific preparation steps are as follows: S1: Precision Melting Steps S1.1 Vacuum induction melting raw materials: ① At 1450℃, maintain for 10 -2 Pre-melt the Ni matrix in a low-pressure argon environment; ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1550°C, and chromium, molybdenum, tungsten and niobium elements are added in sequence and stirred until fully melted; ③ Add iron and copper at 1525℃ and continue stirring until fully melted; ④ Lower the melting temperature to 1500℃, add aluminum and titanium elements, and stir evenly; ⑤ Reduce the temperature to 1400℃ and add yttrium, cerium, zirconium and boron; ⑥ Control the melting temperature to 1550℃, keep it warm for 10 minutes, cool it to 1400℃ at 4℃ / min, and then quickly cool it to 500℃ at 20℃ / min.

[0095] S1.2 Vacuum Arc Remelting: The ingot obtained by vacuum induction melting was placed in a vacuum arc furnace under the following conditions: melting current 6kA, melting speed 15mm / min, vacuum degree 0.5Pa. The remelted ingot was directly transferred to furnace cooling at a temperature above 1000℃.

[0096] S1.3 Furnace cooling control: The remelted ingot was slowly cooled to 1000°C at 3°C / min, and then rapidly cooled to 500°C at 20°C / min.

[0097] S2: Directional solidification control step S2.1 Heating stage: The ingot was heated from 500°C to 1500°C at 5°C / min.

[0098] S2.2 The first cooling and solidification stage: The ingot was cooled to 1200°C at 2°C / min and pulled at 0.5mm / min to control the cooling and crystallization to be uniform.

[0099] S2.3 Second cooling and solidification stage: The ingot was rapidly cooled to 800°C at 30°C / min.

[0100] S3: variable temperature multi-stage heat treatment step S3.1 Solution treatment: The ingot was heated to 1120°C at 5°C / min, kept at this temperature for 3 hours, and then oil quenched.

[0101] S3.2 The first aging treatment stage: The ingot was heated to 850°C at 3°C / min, kept at that temperature for 10 hours, and then cooled to room temperature at 7°C / min.

[0102] S3.3 The second aging treatment stage: The ingot was heated to 750°C at 4°C / min, kept at that temperature for 8 hours, and then cooled to room temperature at 7°C / min.

[0103] Example 8 Example 8 discloses a method for preparing a nickel-based corrosion-resistant alloy, wherein the raw materials are configured in the following weight percentages: Chromium (Cr): 22wt%; Molybdenum (Mo): 8wt%; Iron (Fe): 1wt%; Copper (Cu): 1.8wt%; Aluminum (Al): 0.5wt%; Titanium (Ti): 0.3wt%; Tungsten (W): 1.5wt%; Boron (B): 0.002wt%; Yttrium (Y): 0.02wt%; Cerium (Ce): 0.02wt%; Niobium (Nb): 0.8wt%; Zirconium (Zr): 0.01wt%; Nickel (Ni): Balance.

[0104] The preparation steps are as follows: S1: Precision Melting Steps S1.1 Vacuum induction melting raw materials: ① At 1430℃, maintain for 10 -2 Pre-melt the Ni matrix in a low-pressure argon environment; ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1520°C, and chromium, molybdenum, tungsten and niobium elements are added in sequence and stirred until fully melted; ③ Raise the temperature to 1550℃, add iron and copper at 1550℃, and continue stirring until fully melted; ④ Lower the melting temperature to 1510℃, add aluminum and titanium elements, and stir evenly; ⑤ Reduce the temperature to 1420℃ and add yttrium, cerium, zirconium and boron; ⑥ Control the melting temperature to 1530℃, keep it warm for 10 minutes, cool it to 1400℃ at 5℃ / min, and then quickly cool it to 550℃ at 25℃ / min.

[0105] S1.2 Vacuum Arc Remelting: The ingot obtained by vacuum induction melting was placed in a vacuum arc furnace under the following conditions: melting current 7kA, melting speed 12mm / min, vacuum degree 0.8Pa. The remelted ingot was directly transferred to furnace cooling at a temperature above 1000℃.

[0106] S1.3 Furnace cooling control: The remelted ingot was slowly cooled to 1000°C at 2°C / min, and then rapidly cooled to 500°C at 25°C / min.

[0107] S2: Directional solidification control step S2.1 Heating stage: The ingot was heated from 500°C to 1500°C at 3°C / min.

[0108] S2.2 The first cooling and solidification stage: The ingot was cooled to 1200°C at 4°C / min and pulled at 0.6mm / min to control the cooling and crystallization to be uniform.

[0109] S2.3 Second cooling and solidification stage: The ingot was rapidly cooled to 800°C at 25°C / min.

[0110] S3: variable temperature multi-stage heat treatment step S3.1 Solution treatment: The ingot was heated to 1140°C at 4°C / min, kept at this temperature for 3 hours, and then oil quenched.

[0111] S3.2 The first aging treatment stage: The ingot was heated to 870°C at 3°C / min, kept at that temperature for 10 hours, and then cooled to room temperature at 5°C / min.

[0112] S3.3 The second aging treatment stage: The ingot was heated to 730°C at 3°C / min, kept at that temperature for 8 hours, and then cooled to room temperature at 5°C / min.

[0113] Example 9 Example 9 discloses a method for preparing a nickel-based corrosion-resistant alloy, wherein the raw materials are configured in the following weight percentages: Chromium (Cr): 25wt%; Molybdenum (Mo): 10wt%; Iron (Fe): 3wt%; Copper (Cu): 3.5wt%; Aluminum (Al): 1.2wt%; Titanium (Ti): 0.8wt%; Tungsten (W): 3.5wt%; Boron (B): 0.01wt%; Yttrium (Y): 0.12wt%; Cerium (Ce): 0.07wt%; Niobium (Nb): 1.8wt%; Zirconium (Zr): 0.1wt%; Nickel (Ni): Balance.

[0114] The preparation steps are as follows: S1: Precision Melting Steps S1.1 Vacuum induction melting raw materials: ① At 1450℃, keep for 10-2 Pre-melt the Ni matrix in a low-pressure argon environment; ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1550°C, and chromium, molybdenum, tungsten and niobium elements are added in sequence and stirred until fully melted; ③ Add iron and copper at 1550℃ and continue stirring until fully melted; ④ Lower the melting temperature to 1520℃, add aluminum and titanium elements, and stir evenly; ⑤ Reduce the temperature to 1450℃ and add yttrium, cerium, zirconium and boron elements; ⑥ Control the melting temperature to 1500℃, keep it warm for 10 minutes, cool it to 1400℃ at 3℃ / min, and then quickly cool it to 600℃ at 30℃ / min.

[0115] S1.2 Vacuum Arc Remelting: The ingot obtained by vacuum induction melting was placed in a vacuum arc furnace under the following conditions: melting current 8kA, melting speed 15mm / min, vacuum degree 1Pa. The remelted ingot was directly transferred to furnace cooling at a temperature above 1000°C.

[0116] S1.3 Furnace cooling control: The remelted ingot was slowly cooled to 1000°C at 5°C / min, and then rapidly cooled to 500°C at 30°C / min.

[0117] S2: Directional solidification control step S2.1 Heating stage: The ingot was heated from 500°C to 1550°C at 4°C / min.

[0118] S2.2 The first cooling and solidification stage: The ingot was cooled to 1200°C at 5°C / min and pulled at 1mm / min to control the cooling and crystallization to be uniform.

[0119] S2.3 Second cooling and solidification stage: The ingot was rapidly cooled to 800°C at 30°C / min.

[0120] S3: variable temperature multi-stage heat treatment step S3.1 Solution treatment: The ingot was heated to 1160°C at 5°C / min, kept at this temperature for 2 hours, and then oil quenched.

[0121] S3.2 The first aging treatment stage: The ingot was heated to 900°C at 5°C / min, kept at that temperature for 8 hours, and then cooled to room temperature at 10°C / min.

[0122] S3.3 The second aging treatment stage: The ingot was heated to 750°C at 5°C / min, kept at that temperature for 6 hours, and then cooled to room temperature at 10°C / min.

[0123] Comparative Example 1 Comparative Example 1 discloses a method for preparing a nickel-based corrosion-resistant alloy, wherein the raw materials are configured as follows by weight percentage: Chromium (Cr): 23.5wt%; Iron (Fe): 2.5wt%; Copper (Cu): 3.0wt%; Aluminum (Al): 0.8wt%; Titanium (Ti): 0.5wt%; Boron (B): 0.005wt%; Nickel (Ni): Balance.

[0124] The preparation steps are as follows: S1: Precision Melting Steps S1.1 Vacuum induction melting raw materials: ① At 1400℃, keep 10 -2 Pre-melt the Ni matrix in a low-pressure argon environment; ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1550°C, chromium is added, and stirred until fully melted; ③ Add iron and copper at 1550℃ and continue stirring until fully melted; ④ Lower the melting temperature to 1520℃, add aluminum and titanium elements, and stir evenly; ⑤ Reduce the temperature to 1450℃ and add boron; ⑥ Control the melting temperature to 1550℃, keep it warm for 10 minutes, cool it to 1400℃ at 5℃ / min, and then quickly cool it to 600℃ at 30℃ / min.

[0125] S1.2 Vacuum Arc Remelting: The ingot obtained by vacuum induction melting was placed in a vacuum arc furnace under the following conditions: melting current 7kA, melting speed 12mm / min, vacuum degree 0.8Pa. The remelted ingot was directly transferred to furnace cooling at a temperature above 1000℃.

[0126] S1.3 Furnace cooling control: The remelted ingot was slowly cooled to 1000°C at 2°C / min, and then rapidly cooled to 500°C at 30°C / min.

[0127] S2: Directional solidification control step S2.1 Heating stage: The ingot was heated from 500°C to 1520°C at 3°C / min.

[0128] S2.2 The first cooling and solidification stage: The ingot was cooled to 1200°C at 2°C / min and pulled at 0.5mm / min to control the cooling and crystallization to be uniform.

[0129] S2.3 Second cooling and solidification stage: The ingot was rapidly cooled to 800°C at 25°C / min.

[0130] S3: variable temperature multi-stage heat treatment step S3.1 Solution treatment: The ingot was heated to 1140°C at 4°C / min, kept at this temperature for 3 hours, and then oil quenched.

[0131] S3.2 The first aging treatment stage: The ingot was heated to 875°C at 4°C / min, kept at that temperature for 10 hours, and then cooled to room temperature at 7°C / min.

[0132] S3.3 The second aging treatment stage: The ingot was heated to 725°C at 4°C / min, kept at that temperature for 8 hours, and then cooled to room temperature at 7°C / min.

[0133] Comparative Example 2 Comparative Example 2 discloses a method for preparing a nickel-based corrosion-resistant alloy, wherein the raw materials are configured in the following weight percentages: Chromium (Cr): 23.5wt%; Molybdenum (Mo): 8.5wt%; Iron (Fe): 2.5wt%; Copper (Cu): 3.0wt%; Aluminum (Al): 0.8wt%; Titanium (Ti): 0.5wt%; Tungsten (W): 2.5wt%; Boron (B): 0.005wt%; Yttrium (Y): 0.05wt%; Cerium (Ce): 0.04wt%; Nickel (Ni): Balance.

[0134] The preparation steps are as follows: S1: Melting step S1.1 Vacuum induction melting of raw materials: at 1550℃, maintain 10 -2 In a low-pressure argon environment, nickel, chromium, molybdenum, tungsten, iron, copper, aluminum, titanium, yttrium, cerium and boron are heated, melted and mixed uniformly, kept warm for 10 minutes, and then cooled to room temperature at 30°C; S1.2 Vacuum Arc Remelting: The ingot obtained by vacuum induction melting was placed in a vacuum arc furnace under the following conditions: melting current 7kA, melting speed 12mm / min, vacuum degree 0.8Pa. The remelted ingot was directly transferred to furnace cooling at a temperature above 1000℃.

[0135] S1.3 Furnace cooling control: The remelted ingot was slowly cooled to 1000°C at 2°C / min, and then rapidly cooled to 500°C at 30°C / min.

[0136] S2: Directional solidification control step S2.1 Heating stage: The ingot was heated from 500°C to 1520°C at 3°C / min.

[0137] S2.2 The first cooling and solidification stage: The ingot was cooled to 1200°C at 2°C / min and pulled at 0.5mm / min to control the cooling and crystallization to be uniform.

[0138] S2.3 Second cooling and solidification stage: The ingot was rapidly cooled to 800°C at 25°C / min.

[0139] S3: variable temperature multi-stage heat treatment step S3.1 Solution treatment: The ingot was heated to 1140°C at 4°C / min, kept at this temperature for 3 hours, and then oil quenched.

[0140] S3.2 The first aging treatment stage: The ingot was heated to 875°C at 4°C / min, kept at that temperature for 10 hours, and then cooled to room temperature at 7°C / min.

[0141] S3.3 The second aging treatment stage: The ingot was heated to 725°C at 4°C / min, kept at that temperature for 8 hours, and then cooled to room temperature at 7°C / min.

[0142] Detection Methods The following tests were performed on Examples 1 to 9 and Comparative Examples 1 to 2: 1. Test the tensile strength and elongation according to GB / T228.1-2021 "Tensile test of metallic materials Part 1: Room temperature test method".

[0143] 2. Test hardness according to GB / T230.1-2018 "Rockwell hardness test for metallic materials Part 1: Test method".

[0144] 3. Test the corrosion resistance according to ASTM G28-2002.

[0145] 4. Test the pitting corrosion rate according to ASTM G48-2011 "Standard Test Method for Pitting and Crevice Corrosion Resistance of Stainless Steel and Related Alloys Using Ferric Chloride Solution".

[0146] According to the above test results, the element ratio design of the nickel-based alloy of the present invention is matched with the fine preparation process to achieve a better corrosion resistance effect.

[0147] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A nickel-based corrosion-resistant alloy, characterized in that: The following elements are included in weight percentage: Chromium: 22-25wt%; Molybdenum: 8-10wt%; Iron: 1-3wt%; Copper: 1.8-3.5wt%; Aluminum: 0.5-1.2wt%; Titanium: 0.3-0.8wt%; Tungsten: 1.5-3.5wt%; Boron: 0.002-0.01wt%; Yttrium: 0.02-0.12wt%; Cerium: 0.02-0.07wt%; Nickel: Balance.

2. A nickel-based corrosion-resistant alloy according to claim 1, characterized in that: It also includes niobium element, and the weight percentage of the niobium element is 0.8-1.8wt%.

3. A nickel-based corrosion-resistant alloy according to claim 1, characterized in that: The weight percentage of the molybdenum element is 9-10wt%; the weight percentage of the tungsten element is 3-3.5wt%.

4. The nickel-based corrosion-resistant alloy according to claim 1, characterized in that: The weight percentage of the yttrium element is 0.08-0.12wt%; the weight percentage of the cerium element is 0.05-0.07wt%.

5. The nickel-based corrosion-resistant alloy according to claim 1, characterized in that: It also includes zirconium element, and the weight percentage of the zirconium element is 0.01-0.1wt%.

6. A method for preparing a nickel-based corrosion-resistant alloy according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: precision melting step; The precise melting step includes three steps: vacuum induction melting of raw materials, vacuum arc remelting and precise furnace cooling control; The specific operation of the S1 precision smelting step is as follows: S1.1 Vacuum induction melting of raw materials: ① at 1400-1450℃, keep for 10 -2 ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1500-1550°C, and chromium, molybdenum, tungsten and niobium elements are added in order from high melting point to low melting point; ③After the elements are fully melted, add iron and copper elements at a temperature of 1550℃; ④ After the elements are fully melted, the melting temperature is lowered to 1500-1520℃, and aluminum and titanium elements are added; ⑤ After they are completely melted, the melting temperature is controlled to 1400-1450℃, and yttrium, cerium, zirconium and boron elements are added; ⑥ After they are completely melted, the melting temperature is controlled to 1500-1550℃, kept warm for 10 minutes, cooled to 1400℃ at a low speed of 3-5℃ / min, and then quickly cooled to 500-600℃ at 20-30℃ / min; S1.2 Vacuum arc remelting: vacuum induction melted ingots are subjected to vacuum arc remelting under the conditions of controlling the melting current to 6-8kA, melting speed to 10-15mm / min, and vacuum degree to 0.5-1Pa to obtain remelted ingots, which are directly transferred to furnace cooling at a temperature higher than 1000°C; S1.3 Furnace cooling control: first slowly cool the remelted ingot to 1000°C at 2-5°C / min; then quickly cool it to 500°C at 20-30°C / min; S2: directional solidification control step; The directional solidification control step includes a heating stage, a first cooling and solidification stage, and a second cooling and solidification stage, wherein the cooling rate of the first cooling and solidification stage is lower than the cooling rate of the second cooling and solidification stage; The specific operation of the S2 directional solidification control step is as follows: S2.1 Heating stage: heat the ingot from 500°C to 1500-1550°C at 3-5°C / min; S2.2 The first cooling and solidification stage: the ingot is cooled to 1200°C at a low speed of 2-5°C / min, and the ingot is pulled at a speed of 0.1-1mm / min; S2.3 Second cooling and solidification stage: the ingot is rapidly cooled to 800°C at 20-30°C / min; S3: variable temperature multi-stage heat treatment step; The variable temperature multi-stage heat treatment step includes a solution treatment, a first aging treatment stage, a second aging treatment stage The specific operation of the S3 variable temperature multi-stage heat treatment step is as follows: S3.1 Solution treatment: heat the ingot to 1120-1160℃ at a rate of 3-5℃ / min, keep it at this temperature for 2-4 hours, and immediately perform oil quenching and rapid cooling; S3.2 First aging treatment stage: heat the ingot to 850-900°C at a rate of 3-5°C / min, keep it at that temperature for 8-12 hours, and then cool it to room temperature at a rate of 5-10°C / min; S3.3 Second aging treatment stage: heat the ingot to 700-750°C at a rate of 3-5°C / min, keep it at that temperature for 6-10 hours, and then cool it to room temperature at a rate of 5-10°C / min.

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