Nickel-based corrosion-resistant alloy and preparation method therefor

Abstract

The present invention relates to the technical field of alloy preparation. Disclosed are a nickel-based corrosion-resistant alloy and a preparation method therefor. The nickel-based corrosion-resistant alloy comprises the following elements in percentage by weight: Cr: 22-25 wt%; Mo: 8-10 wt%; Fe: 1-3 wt%; Cu: 1.8-3.5 wt%; Al: 0.5-1.2 wt%; Ti: 0.3-0.8 wt%; W: 1.5-3.5 wt%; B: 0.002-0.01 wt%; Y: 0.02-0.12 wt%; Ce: 0.02-0.07 wt%; and Ni: the balance. The present invention has the effect of improving the corrosion resistance of nickel-based alloys by means of a combination of multi-component alloying and a fine preparation process.

Description

A nickel-based corrosion-resistant alloy and its preparation method Technical Field

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

[0002] While traditional nickel-based alloys possess good corrosion resistance and high-temperature performance, their performance still needs improvement in certain extreme environments, such as high salinity, high acidity, or high-temperature atmospheres. This is particularly critical in fields like petrochemicals, marine engineering, and nuclear reactors, where corrosion resistance and high-temperature performance are paramount. Therefore, there is a need to develop a novel nickel-based alloy to meet the application requirements in these demanding environments. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a nickel-based corrosion-resistant alloy and its preparation method.

[0004] The above-mentioned objective of the present invention is achieved through the following technical solution:

[0005] A nickel-based corrosion-resistant alloy comprising the following elements by weight percentage:

[0006] Cr: 22-25wt%

[0007] Mo: 8-10 wt%

[0008] Fe: 1-3wt%

[0009] Cu: 1.8-3.5 wt%

[0010] Al: 0.5-1.2 wt%

[0011] Ti: 0.3-0.8wt%

[0012] W: 1.5-3.5wt%

[0013] B: 0.002-0.01wt%

[0014] Y: 0.02-0.12wt%

[0015] Ce: 0.02-0.07wt%

[0016] Ni: Balance.

[0017] The alloy of this invention incorporates 22-25 wt% chromium (Cr) and 8-10 wt% molybdenum (Mo), forming a stable passivation film that effectively improves the alloy's corrosion resistance in high-temperature oxidizing environments. The addition of molybdenum particularly enhances resistance to pitting and crevice corrosion, making it suitable for harsh conditions in acidic media and high-temperature atmospheres. Furthermore, the synergistic effect of chromium and molybdenum reduces oxide film defects and improves high-temperature corrosion resistance. The addition of a small amount of tungsten (W, 1.5-3.5 wt%) further strengthens the alloy's chemical stability in high-temperature oxidizing and corrosive environments. The rare earth elements yttrium (Y, 0.02-0.12 wt%) and cerium (Ce, 0.02-0.07 wt%) optimize the oxide film structure of the alloy, enhancing its oxidation resistance in high-temperature environments.

[0018] The addition of 1.8-3.5 wt% copper (Cu) significantly improves the alloy's resistance to chloride ion corrosion. Copper can inhibit the diffusion of chloride ions and the occurrence of localized corrosion, exhibiting superior resistance to stress corrosion cracking, especially in marine or chloride-containing corrosive environments. Simultaneously, the synergistic effect of molybdenum and tungsten enhances the alloy's corrosion resistance in chlorinated acidic media, extending its service life in harsh environments.

[0019] By introducing 0.5-1.2 wt% aluminum (Al) and 0.3-0.8 wt% titanium (Ti), precipitated strengthening phases (such as γ' or Ni3(Al,Ti)) are formed in the alloy, significantly improving the strength and hardness of the material while maintaining good toughness. An appropriate amount of iron (Fe, 1-3 wt%) maintains the alloy's high strength while improving its plasticity and impact resistance, ensuring the material's reliability under harsh conditions.

[0020] The addition of trace amounts of boron (B, 0.002-0.01 wt%) improves the grain boundary strength of the alloy, reducing stress concentration and corrosion risk at grain boundaries. Rare earth elements yttrium and cerium can refine grains and enhance grain boundary stability, thereby improving the material's high-temperature creep resistance and fatigue resistance.

[0021] Furthermore, it also includes niobium, wherein the weight percentage of niobium is 0.8-1.8 wt%.

[0022] The introduction of niobium allows it to form stable Ni3(Al,Ti,Nb) precipitates with aluminum and titanium, further enhancing the alloy's strength and hardness. Simultaneously, the thermal stability of these precipitates enables the material to maintain excellent mechanical properties under high-temperature conditions, making it particularly suitable for high-temperature equipment and structural components. Niobium effectively inhibits grain boundary slippage and propagation, reducing creep deformation in high-temperature environments and thus improving the alloy's high-temperature service life. This improvement is especially important for workpieces exposed to high-temperature and high-stress environments for extended periods. The trace segregation of niobium at grain boundaries suppresses the corrosion susceptibility of grain boundary precipitates, further enhancing the alloy's corrosion resistance in acidic media. Furthermore, the combined effect of niobium with molybdenum and tungsten enhances resistance to pitting and crevice corrosion, resulting in superior performance in chloride-containing environments.

[0023] Furthermore, the molybdenum element has a weight percentage of 9-10 wt%; the tungsten element has a weight percentage of 3-3.5 wt%.

[0024] The higher molybdenum content (9-10 wt%) further enhances resistance to pitting and crevice corrosion, resulting in superior performance of the alloy in strongly acidic and chloride-containing environments. The high molybdenum content also enhances the stability of the passivation film, reducing the risk of localized corrosion. The increased tungsten content (3-3.5 wt%) significantly increases the alloy's strength under high-temperature conditions. Tungsten's high melting point and strengthening effect enable the material to withstand higher mechanical stresses at high temperatures, making it particularly suitable for high-temperature and high-pressure applications.

[0025] Furthermore, the weight percentage of yttrium is 0.08-0.12 wt%; and the weight percentage of cerium is 0.05-0.07 wt%.

[0026] Higher concentrations of yttrium and cerium further improve the density 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 grains and form a stabilizing effect at grain boundaries, reducing corrosion susceptibility caused by grain boundary precipitates, making them particularly suitable for long-term use in high-temperature corrosive media.

[0027] Furthermore, it also includes zirconium, wherein the weight percentage of zirconium is 0.01-0.1 wt%.

[0028] Zirconium effectively reduces the tendency for grain boundary precipitate formation, inhibits grain boundary corrosion susceptibility, and enhances grain boundary bonding strength, thereby improving the reliability of the alloy in harsh environments. The addition of zirconium optimizes the alloy's anti-oxidation film structure, further enhancing the material's stability and durability in high-temperature oxidizing environments. The addition of trace amounts of zirconium significantly extends the fatigue life of the material in high-temperature, high-stress environments while maintaining excellent corrosion resistance, making it suitable for critical equipment components under extreme conditions.

[0029] A method for preparing a nickel-based corrosion-resistant alloy includes the following steps:

[0030] S1: Precision melting process;

[0031] The precision smelting process includes three steps: vacuum induction smelting of raw materials, vacuum arc remelting, and precision furnace cooling control.

[0032] S2: Directional solidification control steps;

[0033] The directional solidification control steps include a heating stage, a first cooling solidification stage, and a second cooling solidification stage, wherein the cooling rate of the first cooling solidification stage is lower than the cooling rate of the second cooling solidification stage.

[0034] S3: Variable temperature multi-stage heat treatment steps;

[0035] The variable-temperature multi-stage heat treatment process includes solution treatment, a first aging treatment stage, and a second aging treatment stage.

[0036] The above preparation method, which combines vacuum induction melting with vacuum arc remelting, ensures the uniformity and purity of the alloy composition. The directional solidification control step, through staged cooling and solidification, forms a columnar crystal structure, which significantly improves the alloy's creep resistance and mechanical properties. The variable-temperature multi-stage heat treatment, through solution treatment and two-stage aging treatment, optimizes the alloy's microstructure and properties, thereby achieving optimization of the alloy's microstructure and improvement of its properties.

[0037] Furthermore, the specific operation of the S1 precision melting step is as follows:

[0038] S1.1 Vacuum induction melting raw materials: ① At 1400-1450℃, while maintaining for 10 -2① Pre-melt the Ni matrix under low-pressure argon gas; ② After the Ni matrix is ​​completely melted, raise the melting temperature to 1500-1550℃ and add chromium, molybdenum, tungsten, and niobium elements in order from high melting point to low melting point; ③ After the elements are fully dissolved, add iron and copper elements at 1550℃; ④ After the elements are fully dissolved, lower the melting temperature to 1500-1520℃ and add titanium; ⑤ After it is completely dissolved, control the melting temperature to 1400-1450℃ and add yttrium, cerium, zirconium, and boron elements; ⑥ After it is completely dissolved, control the melting temperature to 1500-1550℃, hold for 10 minutes, cool at a low speed of 3-5℃ / min to 1400℃, and then rapidly cool to 500-600℃ at 20-30℃ / min.

[0039] S1.2 Vacuum Arc Remelting: Vacuum induction melting ingots are remelted by vacuum arc under the conditions of melting current of 6-8kA, melting speed of 10-15mm / min, and vacuum degree of 0.5-1Pa to obtain remelted ingots. The remelted ingots are directly transferred to furnace cooling at a temperature above 1000℃.

[0040] S1.3 Furnace cooling control: The remelted ingot is first slowly cooled to 1000℃ at 2-5℃ / min; then rapidly cooled to 500℃ at 20-30℃ / min.

[0041] The preferential addition of high-melting-point elements such as chromium, molybdenum, tungsten, and niobium, combined with strict temperature control (1500-1550℃), ensures complete dissolution of these elements and reduces micro-segregation. In particular, tungsten and molybdenum tend to form complex intermediate phases at high temperatures; insufficient temperature or improper addition order may lead to the stabilization of these intermediate phases, thus affecting the alloy's performance. The subsequent addition of rare earth elements (yttrium and cerium) and zirconium and boron significantly enhances grain refinement through reaction 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.

[0042] The vacuum arc remelting step, through precise control of the melting current (6-8 kA) and melting speed (10-15 mm / min), effectively eliminates macroscopic segregation from the previous step, reduces the number of inclusions, and refines the grain structure. The uniform microstructure formed during remelting provides a foundation for the stable growth of columnar crystals in the directional solidification step. The combination of arc energy input and molten pool stability during remelting results in a denser ingot structure, particularly with significant improvement in the distribution of high-melting-point elements (such as molybdenum and tungsten). The controlled furnace cooling 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, preventing premature formation of precipitates.

[0043] The precise temperature control strategy during the furnace cooling stage (slow cooling to 1000℃ at 2-5℃ / min, followed by rapid cooling to 500℃ at 20-30℃ / min) further highlights its importance. The main function of the slow cooling stage is to eliminate thermal stress within the crystals, while simultaneously allowing high-melting-point elements (such as molybdenum and tungsten) to gradually diffuse into the alloy matrix, forming a uniform distribution. Rapid cooling inhibits the formation of low-temperature precipitates and locks in the synergistic strengthening effect of rare earth elements and the matrix, ensuring a balance between 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 material's creep resistance.

[0044] Furthermore, the specific operation of the S2 directional solidification control step is as follows:

[0045] S2.1 Heating stage: Heat the ingot from 500℃ to 1500-1550℃ at a rate of 3-5℃ / min;

[0046] S2.2 First cooling and solidification stage: The ingot is cooled to 1200℃ at a low speed of 2-5℃ / min, and then drawn at a speed of 0.1-1mm / min;

[0047] S2.3 Second Cooling and Solidification Stage: The ingot is rapidly cooled to 800℃ at a rate of 20-30℃ / min.

[0048] Heating to 1500-1550℃ at 3-5℃ / min avoids the accumulation of thermal stress inside the ingot due to excessive temperature gradients, ensuring uniform temperature distribution and creating a uniform molten pool environment for subsequent directional solidification. The high-temperature heating stage causes the initial precipitates (such as brittle compounds) that may exist on the grain boundaries to redissolve, laying the foundation for the stable growth of columnar crystals during directional solidification.

[0049] At low cooling rates, solute diffusion in the liquid metal is adequately regulated, which is beneficial for columnar crystal growth along the directional drawing direction, while reducing chemical segregation between dendrites. Controlling the drawing speed to 0.1-1 mm / min promotes preferred grain orientation growth, avoids the formation of equiaxed crystals, and thus improves the material's high-temperature creep resistance and grain boundary strength.

[0050] Rapid cooling suppresses the non-uniform precipitation of the second phase by compressing the diffusion rate of elements at grain boundaries. Simultaneously, it preserves the microstructure in a high-temperature solid solution state, reduces the formation of brittle precipitates near grain boundaries, and further optimizes the efficiency of subsequent heat treatment.

[0051] Furthermore, the specific operation of the S3 variable temperature multi-stage heat treatment step is as follows:

[0052] S3.1 Solution treatment: Heat the ingot to 1120-1160℃ at a rate of 3-5℃ / min, hold for 2-4 hours, and then immediately perform oil quenching for rapid cooling;

[0053] S3.2 First aging treatment stage: Heat the ingot to 850-900℃ at a rate of 3-5℃ / min, hold for 8-12 hours, and then cool to room temperature at a rate of 5-10℃ / min;

[0054] S3.3 Second aging treatment stage: Heat the ingot to 700-750℃ at a rate of 3-5℃ / min, hold for 6-10 hours, and then cool to room temperature at a rate of 5-10℃ / min.

[0055] At high temperatures of 1120-1160℃, carbides and other low-temperature precipitates (such as Laves or σ phases) can dissolve sufficiently, greatly improving the chemical homogeneity of the matrix. This process reduces microscopic segregation within the material, providing a basis for a uniform elemental distribution in subsequent aging treatments.

[0056] Holding at 1120-1160℃ for 2-4 hours fully dissolves carbides and other low-temperature precipitates, optimizing matrix homogeneity and creating ideal conditions for aging treatment. Rapid oil quenching prevents the regeneration of precipitates at high temperatures. Prolonged holding at 850-900℃ (8-12 hours) ensures complete precipitation of the γ′ phase, significantly improving the alloy's high-temperature strength and creep resistance. Holding at 700-750℃ (6-10 hours) optimizes the morphology of the precipitates, further enhancing toughness and fatigue resistance, resulting in more balanced mechanical properties. Slow cooling to room temperature ensures the release of thermal stress and microstructural stability.

[0057] Compared with the prior art, the beneficial effects of the present invention are mainly reflected in the following aspects:

[0058] 1. The nickel-based alloy of this invention, through a carefully designed alloy composition (such as the addition of molybdenum, tungsten, niobium, and rare earth elements yttrium and cerium) combined with processing techniques, forms an optimized passivation film and microstructure, significantly improving corrosion resistance and durability in high-temperature and corrosive environments. This characteristic makes the alloy particularly suitable for harsh environments such as marine, petrochemical, and nuclear energy sectors. The copper element in the alloy significantly enhances its resistance to chloride ion corrosion, while the synergistic effect of chromium and molybdenum further improves the alloy's stability in acidic and chloride-containing environments. This synergistic effect between elements enables the nickel-based alloy of this invention to exhibit superior performance in various corrosive environments.

[0059] 2. Through precise melting and directional solidification techniques, the alloy preparation process accurately controls crystal growth and precipitate formation, thereby optimizing the material's high-temperature strength and creep resistance. This technological innovation ensures the stability and reliability of the material in long-term high-temperature applications.

[0060] 3. Through reasonable element ratios and preparation processes, the high-temperature strength and low-temperature toughness of the alloy are simultaneously optimized. 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, enabling the alloy to perform excellently in corrosive environments containing chlorine and other pollutants. Detailed Implementation

[0061] The present invention will now be described in detail with reference to the embodiments. Example

[0062] Example 1 discloses a method for preparing a nickel-based corrosion-resistant alloy, wherein the raw materials are configured in the following weight percentages:

[0063] Chromium (Cr): 23.5 wt%

[0064] Molybdenum (Mo): 8.5wt%;

[0065] Iron (Fe): 2.5 wt%

[0066] Copper (Cu): 3.0 wt%

[0067] Aluminum (Al): 0.8 wt%

[0068] Titanium (Ti): 0.5 wt%

[0069] Tungsten (W): 2.5 wt%

[0070] Boron (B): 0.005 wt%

[0071] Yttrium (Y): 0.05 wt%

[0072] Cerium (Ce): 0.04 wt%

[0073] Nickel (Ni): Balance.

[0074] The preparation steps are as follows:

[0075] S1: Precision Melting Steps

[0076] S1.1 Vacuum Induction Melting Raw Materials:

[0077] ① Maintain at 1400℃ for 10 -2 Pre-melted Ni matrix in a low-pressure argon atmosphere;

[0078] ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1550℃, and chromium, molybdenum and tungsten are added in sequence and stirred until fully dissolved;

[0079] ③ Add iron and copper at 1550℃ and continue stirring until fully dissolved;

[0080] ④ Lower the melting temperature to 1520℃, add titanium, and stir until homogeneous;

[0081] ⑤ Reduce the temperature to 1450℃ and add yttrium, cerium, and boron.

[0082] ⑥ Control the melting temperature to 1550℃, hold for 10 minutes, then cool to 1400℃ at 5℃ / min, and then rapidly cool to 600℃ at 30℃ / min.

[0083] S1.2 Vacuum Arc Remelting:

[0084] The ingot obtained from vacuum induction melting was placed in a vacuum electric arc furnace under the following conditions: melting current of 7 kA, melting speed of 12 mm / min, and vacuum degree of 0.8 Pa. The remelted ingot was then directly transferred to furnace cooling at a temperature above 1000°C.

[0085] S1.3 Furnace Cooling Control:

[0086] The remelted ingot is slowly cooled to 1000°C at 2°C / min, and then rapidly cooled to 500°C at 30°C / min.

[0087] S2: Directional solidification control steps

[0088] S2.1 Heating Stage:

[0089] The ingot is heated from 500℃ to 1520℃ at a rate of 3℃ / min.

[0090] S2.2 First cooling and solidification stage:

[0091] The ingot was cooled to 1200℃ at a rate of 2℃ / min and then drawn at a rate of 0.5mm / min to control the uniformity of cooling and crystallization.

[0092] S2.3 Second cooling and solidification stage:

[0093] The ingot was rapidly cooled to 800°C at a rate of 25°C / min.

[0094] S3: Variable Temperature Multi-Stage Heat Treatment Steps

[0095] S3.1 Solution treatment:

[0096] The ingot was heated to 1140℃ at a rate of 4℃ / min, held for 3 hours, and then oil quenched.

[0097] S3.2 First Time-Limited Processing Stage:

[0098] The ingot was heated to 875°C at 4°C / min, held at that temperature for 10 hours, and then cooled to room temperature at 7°C / min.

[0099] S3.3 Second Time-Limited Processing Stage:

[0100] The ingot was heated to 725°C at 4°C / min, held at that temperature for 8 hours, and then cooled to room temperature at 7°C / min. Example

[0101] Example 2 discloses a method for preparing a nickel-based corrosion-resistant alloy, wherein the raw materials are configured in the following weight percentages:

[0102] Chromium (Cr): 23.5 wt%

[0103] Molybdenum (Mo): 9.5wt%;

[0104] Iron (Fe): 2.5 wt%

[0105] Copper (Cu): 3.0 wt%

[0106] Aluminum (Al): 0.8 wt%

[0107] Titanium (Ti): 0.5 wt%

[0108] Tungsten (W): 3.5 wt%

[0109] Boron (B): 0.005 wt%

[0110] Yttrium (Y): 0.05 wt%

[0111] Cerium (Ce): 0.04 wt%

[0112] Nickel (Ni): Balance.

[0113] The preparation steps are as follows:

[0114] S1: Precision Melting Steps

[0115] S1.1 Vacuum Induction Melting Raw Materials:

[0116] ① Maintain at 1400℃ for 10 -2 Pre-melted Ni matrix in a low-pressure argon atmosphere;

[0117] ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1550℃, and chromium, molybdenum and tungsten are added in sequence and stirred until fully dissolved;

[0118] ③ Add iron and copper at 1550℃ and continue stirring until fully dissolved;

[0119] ④ Lower the melting temperature to 1520℃, add titanium, and stir until homogeneous;

[0120] ⑤ Reduce the temperature to 1450℃ and add yttrium, cerium, and boron.

[0121] ⑥ Control the melting temperature to 1550℃, hold for 10 minutes, then cool to 1400℃ at 5℃ / min, and then rapidly cool to 600℃ at 30℃ / min.

[0122] S1.2 Vacuum Arc Remelting:

[0123] The ingot obtained from vacuum induction melting was placed in a vacuum electric arc furnace under the following conditions: melting current of 7 kA, melting speed of 12 mm / min, and vacuum degree of 0.8 Pa. The remelted ingot was then directly transferred to furnace cooling at a temperature above 1000°C.

[0124] S1.3 Furnace Cooling Control:

[0125] The remelted ingot is slowly cooled to 1000°C at 2°C / min, and then rapidly cooled to 500°C at 20°C / min.

[0126] S2: Directional solidification control steps

[0127] S2.1 Heating Stage:

[0128] The ingot is heated from 500℃ to 1520℃ at a rate of 3℃ / min.

[0129] S2.2 First cooling and solidification stage:

[0130] The ingot was cooled to 1200℃ at a rate of 2℃ / min and then drawn at a rate of 0.5mm / min to control the uniformity of cooling and crystallization.

[0131] S2.3 Second cooling and solidification stage:

[0132] The ingot was rapidly cooled to 800°C at a rate of 25°C / min.

[0133] S3: Variable Temperature Multi-Stage Heat Treatment Steps

[0134] S3.1 Solution treatment:

[0135] The ingot was heated to 1140℃ at a rate of 4℃ / min, held for 3 hours, and then oil quenched.

[0136] S3.2 First Time-Limited Processing Stage:

[0137] The ingot was heated to 875°C at 4°C / min, held at that temperature for 10 hours, and then cooled to room temperature at 7°C / min.

[0138] S3.3 Second Time-Limited Processing Stage:

[0139] The ingot was heated to 725°C at 4°C / min, held at that temperature for 8 hours, and then cooled to room temperature at 7°C / min. Example

[0140] Example 3 discloses a method for preparing a nickel-based corrosion-resistant alloy, wherein the raw materials are configured in the following weight percentages:

[0141] Chromium (Cr): 23.5 wt%

[0142] Molybdenum (Mo): 8.5wt%;

[0143] Iron (Fe): 2.5 wt%

[0144] Copper (Cu): 3.0 wt%

[0145] Aluminum (Al): 0.8 wt%

[0146] Titanium (Ti): 0.5 wt%

[0147] Tungsten (W): 2.5 wt%

[0148] Boron (B): 0.005 wt%

[0149] Yttrium (Y): 0.1 wt%

[0150] Cerium (Ce): 0.06 wt%

[0151] Nickel (Ni): Balance.

[0152] The preparation steps are as follows:

[0153] S1: Precision Melting Steps

[0154] S1.1 Vacuum Induction Melting Raw Materials:

[0155] ① Maintain at 1400℃ for 10 -2 Pre-melted Ni matrix in a low-pressure argon atmosphere;

[0156] ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1550℃, and chromium, molybdenum and tungsten are added in sequence and stirred until fully dissolved;

[0157] ③ Add iron and copper at 1550℃ and continue stirring until fully dissolved;

[0158] ④ Lower the melting temperature to 1520℃, add titanium, and stir until homogeneous;

[0159] ⑤ Reduce the temperature to 1450℃ and add yttrium, cerium, and boron.

[0160] ⑥ Control the melting temperature to 1550℃, hold for 10 minutes, then cool to 1400℃ at 3℃ / min, and then rapidly cool to 600℃ at 30℃ / min.

[0161] S1.2 Vacuum Arc Remelting:

[0162] The ingot obtained from vacuum induction melting was placed in a vacuum electric arc furnace under the following conditions: melting current of 7 kA, melting speed of 12 mm / min, and vacuum degree of 0.8 Pa. The remelted ingot was then directly transferred to furnace cooling at a temperature above 1000°C.

[0163] S1.3 Furnace Cooling Control:

[0164] The remelted ingot is slowly cooled to 1000°C at 2°C / min, and then rapidly cooled to 500°C at 30°C / min.

[0165] S2: Directional solidification control steps

[0166] S2.1 Heating Stage:

[0167] The ingot is heated from 500℃ to 1520℃ at a rate of 3℃ / min.

[0168] S2.2 First cooling and solidification stage:

[0169] The ingot was cooled to 1200℃ at a rate of 2℃ / min and then drawn at a rate of 0.5mm / min to control the uniformity of cooling and crystallization.

[0170] S2.3 Second cooling and solidification stage:

[0171] The ingot was rapidly cooled to 800°C at a rate of 25°C / min.

[0172] S3: Variable Temperature Multi-Stage Heat Treatment Steps

[0173] S3.1 Solution treatment:

[0174] The ingot was heated to 1140℃ at a rate of 4℃ / min, held for 3 hours, and then oil quenched.

[0175] S3.2 First Time-Limited Processing Stage:

[0176] The ingot was heated to 875°C at 4°C / min, held at that temperature for 10 hours, and then cooled to room temperature at 7°C / min.

[0177] S3.3 Second Time-Limited Processing Stage:

[0178] The ingot was heated to 725°C at 4°C / min, held at that temperature for 8 hours, and then cooled to room temperature at 7°C / min. Example

[0179] Example 4 discloses a method for preparing a nickel-based corrosion-resistant alloy, wherein the raw materials are configured in the following weight percentages:

[0180] Chromium (Cr): 23.5 wt%

[0181] Molybdenum (Mo): 9.5wt%;

[0182] Iron (Fe): 2.5 wt%

[0183] Copper (Cu): 3.0 wt%

[0184] Aluminum (Al): 0.8 wt%

[0185] Titanium (Ti): 0.5 wt%

[0186] Tungsten (W): 3.5 wt%

[0187] Boron (B): 0.005 wt%

[0188] Yttrium (Y): 0.1 wt%

[0189] Cerium (Ce): 0.06 wt%

[0190] Nickel (Ni): Balance.

[0191] The preparation steps are as follows:

[0192] S1: Precision Melting Steps

[0193] S1.1 Vacuum Induction Melting Raw Materials:

[0194] ① Maintain at 1400℃ for 10 -2 Pre-melted Ni matrix in a low-pressure argon atmosphere;

[0195] ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1550℃, and chromium, molybdenum and tungsten are added in sequence and stirred until fully dissolved;

[0196] ③ Add iron and copper at 1550℃ and continue stirring until fully dissolved;

[0197] ④ Lower the melting temperature to 1520℃, add titanium, and stir until homogeneous;

[0198] ⑤ Reduce the temperature to 1450℃ and add yttrium, cerium, and boron.

[0199] ⑥ Control the melting temperature to 1550℃, hold for 10 minutes, then cool to 1400℃ at 3℃ / min, and then rapidly cool to 600℃ at 30℃ / min.

[0200] S1.2 Vacuum Arc Remelting:

[0201] The ingot obtained from vacuum induction melting was placed in a vacuum electric arc furnace under the following conditions: melting current of 7 kA, melting speed of 12 mm / min, and vacuum degree of 0.8 Pa. The remelted ingot was then directly transferred to furnace cooling at a temperature above 1000°C.

[0202] S1.3 Furnace Cooling Control:

[0203] The remelted ingot is slowly cooled to 1000°C at 2°C / min, and then rapidly cooled to 500°C at 30°C / min.

[0204] S2: Directional solidification control steps

[0205] S2.1 Heating Stage:

[0206] The ingot is heated from 500℃ to 1520℃ at a rate of 3℃ / min.

[0207] S2.2 First cooling and solidification stage:

[0208] The ingot was cooled to 1200℃ at a rate of 2℃ / min and then drawn at a rate of 0.5mm / min to control the uniformity of cooling and crystallization.

[0209] S2.3 Second cooling and solidification stage:

[0210] The ingot was rapidly cooled to 800°C at a rate of 25°C / min.

[0211] S3: Variable Temperature Multi-Stage Heat Treatment Steps

[0212] S3.1 Solution treatment:

[0213] The ingot was heated to 1140℃ at a rate of 4℃ / min, held for 3 hours, and then oil quenched.

[0214] S3.2 First Time-Limited Processing Stage:

[0215] The ingot was heated to 875°C at 4°C / min, held at that temperature for 10 hours, and then cooled to room temperature at 7°C / min.

[0216] S3.3 Second Time-Limited Processing Stage:

[0217] The ingot was heated to 725°C at 4°C / min, held at that temperature for 8 hours, and then cooled to room temperature at 7°C / min. Example

[0218] Example 5 discloses a method for preparing a nickel-based corrosion-resistant alloy, wherein the raw materials are configured in the following weight percentages:

[0219] Chromium (Cr): 23.5 wt%

[0220] Molybdenum (Mo): 9.5wt%;

[0221] Iron (Fe): 2.5 wt%

[0222] Copper (Cu): 3.0 wt%

[0223] Aluminum (Al): 0.8 wt%

[0224] Titanium (Ti): 0.5 wt%

[0225] Tungsten (W): 3.5 wt%

[0226] Boron (B): 0.005 wt%

[0227] Yttrium (Y): 0.1 wt%

[0228] Cerium (Ce): 0.06 wt%

[0229] Niobium (Nb): 0.9 wt%

[0230] Nickel (Ni): Balance.

[0231] The preparation steps are as follows:

[0232] S1: Precision Melting Steps

[0233] S1.1 Vacuum Induction Melting Raw Materials:

[0234] ① Maintain at 1400℃ for 10 -2 Pre-melted Ni matrix in a low-pressure argon atmosphere;

[0235] ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1550℃, and chromium, molybdenum, tungsten and niobium elements are added in sequence and stirred until fully dissolved;

[0236] ③ Add iron and copper at 1550℃ and continue stirring until fully dissolved;

[0237] ④ Lower the melting temperature to 1520℃, add titanium, and stir until homogeneous;

[0238] ⑤ Reduce the temperature to 1450℃ and add yttrium, cerium, and boron.

[0239] ⑥ Control the melting temperature to 1550℃, hold for 10 minutes, then cool to 1400℃ at 5℃ / min, and then rapidly cool to 600℃ at 30℃ / min.

[0240] S1.2 Vacuum Arc Remelting:

[0241] The ingot obtained from vacuum induction melting was placed in a vacuum electric arc furnace under the following conditions: melting current of 7 kA, melting speed of 12 mm / min, and vacuum degree of 0.8 Pa. The remelted ingot was then directly transferred to furnace cooling at a temperature above 1000°C.

[0242] S1.3 Furnace Cooling Control:

[0243] The remelted ingot is slowly cooled to 1000°C at 2°C / min, and then rapidly cooled to 500°C at 30°C / min.

[0244] S2: Directional solidification control steps

[0245] S2.1 Heating Stage:

[0246] The ingot is heated from 500℃ to 1520℃ at a rate of 3℃ / min.

[0247] S2.2 First cooling and solidification stage:

[0248] The ingot was cooled to 1200℃ at a rate of 2℃ / min and then drawn at a rate of 0.5mm / min to control the uniformity of cooling and crystallization.

[0249] S2.3 Second cooling and solidification stage:

[0250] The ingot was rapidly cooled to 800°C at a rate of 25°C / min.

[0251] S3: Variable Temperature Multi-Stage Heat Treatment Steps

[0252] S3.1 Solution treatment:

[0253] The ingot was heated to 1140℃ at a rate of 4℃ / min, held for 3 hours, and then oil quenched.

[0254] S3.2 First Time-Limited Processing Stage:

[0255] The ingot was heated to 875°C at 4°C / min, held at that temperature for 10 hours, and then cooled to room temperature at 7°C / min.

[0256] S3.3 Second Time-Limited Processing Stage:

[0257] The ingot was heated to 725°C at 4°C / min, held at that temperature for 8 hours, and then cooled to room temperature at 7°C / min. Example

[0258] Example 6 discloses a method for preparing a nickel-based corrosion-resistant alloy, wherein the raw materials are configured in the following weight percentages:

[0259] Chromium (Cr): 23.5 wt%

[0260] Molybdenum (Mo): 9.5wt%;

[0261] Iron (Fe): 2.5 wt%

[0262] Copper (Cu): 3.0 wt%

[0263] Aluminum (Al): 0.8 wt%

[0264] Titanium (Ti): 0.5 wt%

[0265] Tungsten (W): 3.5 wt%

[0266] Boron (B): 0.005 wt%

[0267] Yttrium (Y): 0.1 wt%

[0268] Cerium (Ce): 0.06 wt%

[0269] Niobium (Nb): 0.9 wt%

[0270] Zirconium (Zr): 0.05 wt%

[0271] Nickel (Ni): Balance.

[0272] The preparation steps are as follows:

[0273] S1: Precision Melting Steps

[0274] S1.1 Vacuum Induction Melting Raw Materials:

[0275] ① Maintain at 1400℃ for 10 -2 Pre-melted Ni matrix in a low-pressure argon atmosphere;

[0276] ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1550℃, and chromium, molybdenum, tungsten and niobium elements are added in sequence and stirred until fully dissolved;

[0277] ③ Add iron and copper at 1550℃ and continue stirring until fully dissolved;

[0278] ④ Lower the melting temperature to 1520℃, add titanium, and stir until homogeneous;

[0279] ⑤ Reduce the temperature to 1450℃ and add yttrium, cerium, zirconium, and boron.

[0280] ⑥ Control the melting temperature to 1550℃, hold for 10 minutes, then cool to 1400℃ at 5℃ / min, and then rapidly cool to 600℃ at 30℃ / min.

[0281] S1.2 Vacuum Arc Remelting:

[0282] The ingot obtained from vacuum induction melting was placed in a vacuum electric arc furnace under the following conditions: melting current of 7 kA, melting speed of 12 mm / min, and vacuum degree of 0.8 Pa. The remelted ingot was then directly transferred to furnace cooling at a temperature above 1000°C.

[0283] S1.3 Furnace Cooling Control:

[0284] The remelted ingot is slowly cooled to 1000°C at 2°C / min, and then rapidly cooled to 500°C at 30°C / min.

[0285] S2: Directional solidification control steps

[0286] S2.1 Heating Stage:

[0287] The ingot is heated from 500℃ to 1520℃ at a rate of 3℃ / min.

[0288] S2.2 First cooling and solidification stage:

[0289] The ingot was cooled to 1200℃ at a rate of 2℃ / min and then drawn at a rate of 0.5mm / min to control the uniformity of cooling and crystallization.

[0290] S2.3 Second cooling and solidification stage:

[0291] The ingot was rapidly cooled to 800°C at a rate of 25°C / min.

[0292] S3: Variable Temperature Multi-Stage Heat Treatment Steps

[0293] S3.1 Solution treatment:

[0294] The ingot was heated to 1140℃ at a rate of 4℃ / min, held for 3 hours, and then oil quenched.

[0295] S3.2 First Time-Limited Processing Stage:

[0296] The ingot was heated to 875°C at 4°C / min, held at that temperature for 10 hours, and then cooled to room temperature at 7°C / min.

[0297] S3.3 Second Time-Limited Processing Stage:

[0298] The ingot was heated to 725°C at 4°C / min, held at that temperature for 8 hours, and then cooled to room temperature at 7°C / min.

[0299] The difference between Example 7 and Example 6 lies in the different settings of some process parameters in the preparation steps. The specific preparation steps are as follows:

[0300] S1: Precision Melting Steps

[0301] S1.1 Vacuum Induction Melting Raw Materials:

[0302] ① Maintain at 1450℃ for 10 -2 Pre-melted Ni matrix in a low-pressure argon atmosphere;

[0303] ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1550℃, and chromium, molybdenum, tungsten and niobium elements are added in sequence and stirred until fully dissolved;

[0304] ③ Add iron and copper at 1525℃ and continue stirring until fully dissolved;

[0305] ④ Reduce the melting temperature to 1500℃, add titanium, and stir until homogeneous;

[0306] ⑤ Reduce the temperature to 1400℃ and add yttrium, cerium, zirconium, and boron.

[0307] ⑥ Control the melting temperature to 1550℃, hold for 10 minutes, then cool to 1400℃ at 4℃ / min, and then rapidly cool to 500℃ at 20℃ / min.

[0308] S1.2 Vacuum Arc Remelting:

[0309] The ingot obtained from vacuum induction melting was placed in a vacuum arc furnace under the following conditions: melting current of 6 kA, melting speed of 15 mm / min, and vacuum degree of 0.5 Pa. The remelted ingot was then directly transferred to furnace cooling at a temperature above 1000°C.

[0310] S1.3 Furnace Cooling Control:

[0311] The remelted ingot is slowly cooled to 1000°C at 3°C / min, and then rapidly cooled to 500°C at 20°C / min.

[0312] S2: Directional solidification control steps

[0313] S2.1 Heating Stage:

[0314] The ingot is heated from 500℃ to 1500℃ at a rate of 5℃ / min.

[0315] S2.2 First cooling and solidification stage:

[0316] The ingot was cooled to 1200℃ at a rate of 2℃ / min and then drawn at a rate of 0.5mm / min to control the uniformity of cooling and crystallization.

[0317] S2.3 Second cooling and solidification stage:

[0318] The ingot was rapidly cooled to 800°C at a rate of 30°C / min.

[0319] S3: Variable Temperature Multi-Stage Heat Treatment Steps

[0320] S3.1 Solution treatment:

[0321] The ingot is heated to 1120℃ at 5℃ / min, held for 3 hours, and then oil quenched.

[0322] S3.2 First Time-Limited Processing Stage:

[0323] The ingot was heated to 850°C at 3°C / min, held at that temperature for 10 hours, and then cooled to room temperature at 7°C / min.

[0324] S3.3 Second Time-Limited Processing Stage:

[0325] The ingot was heated to 750°C at 4°C / min, held at that temperature for 8 hours, and then cooled to room temperature at 7°C / min. Example

[0326] Example 8 discloses a method for preparing a nickel-based corrosion-resistant alloy, wherein the raw materials are configured in the following weight percentages:

[0327] Chromium (Cr): 22 wt%

[0328] Molybdenum (Mo): 8wt%;

[0329] Iron (Fe): 1wt%

[0330] Copper (Cu): 1.8 wt%

[0331] Aluminum (Al): 0.5 wt%

[0332] Titanium (Ti): 0.3 wt%

[0333] Tungsten (W): 1.5 wt%

[0334] Boron (B): 0.002 wt%

[0335] Yttrium (Y): 0.02wt%;

[0336] Cerium (Ce): 0.02 wt%

[0337] Niobium (Nb): 0.8 wt%

[0338] Zirconium (Zr): 0.01 wt%

[0339] Nickel (Ni): Balance.

[0340] The preparation steps are as follows:

[0341] S1: Precision Melting Steps

[0342] S1.1 Vacuum Induction Melting Raw Materials:

[0343] ① Maintain at 1430℃ for 10 -2Pre-melted Ni matrix in a low-pressure argon atmosphere;

[0344] ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1520℃, and chromium, molybdenum, tungsten and niobium elements are added in sequence and stirred until fully dissolved;

[0345] ③ Heat to 1550℃, add iron and copper at 1550℃, and continue stirring until fully dissolved;

[0346] ④ Lower the melting temperature to 1510℃, add titanium, and stir until homogeneous;

[0347] ⑤ Reduce the temperature to 1420℃ and add yttrium, cerium, zirconium, and boron.

[0348] ⑥ Control the melting temperature to 1530℃, hold for 10 minutes, then cool to 1400℃ at 5℃ / min, and then rapidly cool to 550℃ at 25℃ / min.

[0349] S1.2 Vacuum Arc Remelting:

[0350] The ingot obtained from vacuum induction melting was placed in a vacuum electric arc furnace under the following conditions: melting current of 7 kA, melting speed of 12 mm / min, and vacuum degree of 0.8 Pa. The remelted ingot was then directly transferred to furnace cooling at a temperature above 1000°C.

[0351] S1.3 Furnace Cooling Control:

[0352] The remelted ingot is slowly cooled to 1000°C at 2°C / min, and then rapidly cooled to 500°C at 25°C / min.

[0353] S2: Directional solidification control steps

[0354] S2.1 Heating Stage:

[0355] The ingot is heated from 500℃ to 1500℃ at a rate of 3℃ / min.

[0356] S2.2 First cooling and solidification stage:

[0357] The ingot was cooled to 1200℃ at a rate of 4℃ / min and then drawn at a rate of 0.6mm / min to control the uniformity of cooling and crystallization.

[0358] S2.3 Second cooling and solidification stage:

[0359] The ingot was rapidly cooled to 800°C at a rate of 25°C / min.

[0360] S3: Variable Temperature Multi-Stage Heat Treatment Steps

[0361] S3.1 Solution treatment:

[0362] The ingot was heated to 1140℃ at a rate of 4℃ / min, held for 3 hours, and then oil quenched.

[0363] S3.2 First Time-Limited Processing Stage:

[0364] The ingot was heated to 870°C at 3°C / min, held at that temperature for 10 hours, and then cooled to room temperature at 5°C / min.

[0365] S3.3 Second Time-Limited Processing Stage:

[0366] The ingot was heated to 730°C at 3°C / min, held at that temperature for 8 hours, and then cooled to room temperature at 5°C / min. Example

[0367] Example 9 discloses a method for preparing a nickel-based corrosion-resistant alloy, wherein the raw materials are configured in the following weight percentages:

[0368] Chromium (Cr): 25 wt%

[0369] Molybdenum (Mo): 10wt%;

[0370] Iron (Fe): 3wt%

[0371] Copper (Cu): 3.5 wt%

[0372] Aluminum (Al): 1.2 wt%

[0373] Titanium (Ti): 0.8 wt%

[0374] Tungsten (W): 3.5 wt%

[0375] Boron (B): 0.01 wt%

[0376] Yttrium (Y): 0.12 wt%

[0377] Cerium (Ce): 0.07 wt%

[0378] Niobium (Nb): 1.8 wt%

[0379] Zirconium (Zr): 0.1 wt%

[0380] Nickel (Ni): Balance.

[0381] The preparation steps are as follows:

[0382] S1: Precision Melting Steps

[0383] S1.1 Vacuum Induction Melting Raw Materials:

[0384] ① Maintain at 1450℃ for 10 -2 Pre-melted Ni matrix in a low-pressure argon atmosphere;

[0385] ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1550℃, and chromium, molybdenum, tungsten and niobium elements are added in sequence and stirred until fully dissolved;

[0386] ③ Add iron and copper at 1550℃ and continue stirring until fully dissolved;

[0387] ④ Lower the melting temperature to 1520℃, add titanium, and stir until homogeneous;

[0388] ⑤ Reduce the temperature to 1450℃ and add yttrium, cerium, zirconium, and boron.

[0389] ⑥ Control the melting temperature to 1500℃, hold for 10 minutes, then cool to 1400℃ at 3℃ / min, and then rapidly cool to 600℃ at 30℃ / min.

[0390] S1.2 Vacuum Arc Remelting:

[0391] The ingot obtained from vacuum induction melting was placed in a vacuum electric arc furnace under the following conditions: melting current of 8kA, melting speed of 15mm / min, and vacuum degree of 1Pa. The remelted ingot was then directly transferred to furnace cooling at a temperature above 1000℃.

[0392] S1.3 Furnace Cooling Control:

[0393] The remelted ingot is slowly cooled to 1000°C at 5°C / min, and then rapidly cooled to 500°C at 30°C / min.

[0394] S2: Directional solidification control steps

[0395] S2.1 Heating Stage:

[0396] The ingot is heated from 500℃ to 1550℃ at a rate of 4℃ / min.

[0397] S2.2 First cooling and solidification stage:

[0398] The ingot is cooled to 1200℃ at 5℃ / min and then drawn at 1mm / min to control the cooling and crystallization uniformity.

[0399] S2.3 Second cooling and solidification stage:

[0400] The ingot was rapidly cooled to 800°C at a rate of 30°C / min.

[0401] S3: Variable Temperature Multi-Stage Heat Treatment Steps

[0402] S3.1 Solution treatment:

[0403] The ingot was heated to 1160°C at a rate of 5°C / min, held for 2 hours, and then oil quenched.

[0404] S3.2 First Time-Limited Processing Stage:

[0405] The ingot is heated to 900°C at 5°C / min, held at that temperature for 8 hours, and then cooled to room temperature at 10°C / min.

[0406] S3.3 Second Time-Limited Processing Stage:

[0407] The ingot is heated to 750°C at 5°C / min, held at that temperature for 6 hours, and then cooled to room temperature at 10°C / min.

[0408] Comparative Example 1

[0409] Comparative Example 1 discloses a method for preparing a nickel-based corrosion-resistant alloy, wherein the raw materials are configured in the following weight percentages:

[0410] Chromium (Cr): 23.5 wt%

[0411] Iron (Fe): 2.5 wt%

[0412] Copper (Cu): 3.0 wt%

[0413] Aluminum (Al): 0.8 wt%

[0414] Titanium (Ti): 0.5 wt%

[0415] Boron (B): 0.005 wt%

[0416] Nickel (Ni): Balance.

[0417] The preparation steps are as follows:

[0418] S1: Precision Melting Steps

[0419] S1.1 Vacuum Induction Melting Raw Materials:

[0420] ① Maintain at 1400℃ for 10 -2 Pre-melted Ni matrix in a low-pressure argon atmosphere;

[0421] ② After the Ni matrix is ​​completely melted, the melting temperature is increased to 1550℃, chromium is added, and the mixture is stirred until fully dissolved;

[0422] ③ Add iron and copper at 1550℃ and continue stirring until fully dissolved;

[0423] ④ Lower the melting temperature to 1520℃, add titanium, and stir until homogeneous;

[0424] ⑤ Cool to 1450℃ and add boron;

[0425] ⑥ Control the melting temperature to 1550℃, hold for 10 minutes, then cool to 1400℃ at 5℃ / min, and then rapidly cool to 600℃ at 30℃ / min.

[0426] S1.2 Vacuum Arc Remelting:

[0427] The ingot obtained from vacuum induction melting was placed in a vacuum electric arc furnace under the following conditions: melting current of 7 kA, melting speed of 12 mm / min, and vacuum degree of 0.8 Pa. The remelted ingot was then directly transferred to furnace cooling at a temperature above 1000°C.

[0428] S1.3 Furnace Cooling Control:

[0429] The remelted ingot is slowly cooled to 1000°C at 2°C / min, and then rapidly cooled to 500°C at 30°C / min.

[0430] S2: Directional solidification control steps

[0431] S2.1 Heating Stage:

[0432] The ingot is heated from 500℃ to 1520℃ at a rate of 3℃ / min.

[0433] S2.2 First cooling and solidification stage:

[0434] The ingot was cooled to 1200℃ at a rate of 2℃ / min and then drawn at a rate of 0.5mm / min to control the uniformity of cooling and crystallization.

[0435] S2.3 Second cooling and solidification stage:

[0436] The ingot was rapidly cooled to 800°C at a rate of 25°C / min.

[0437] S3: Variable Temperature Multi-Stage Heat Treatment Steps

[0438] S3.1 Solution treatment:

[0439] The ingot was heated to 1140℃ at a rate of 4℃ / min, held for 3 hours, and then oil quenched.

[0440] S3.2 First Time-Limited Processing Stage:

[0441] The ingot was heated to 875°C at 4°C / min, held at that temperature for 10 hours, and then cooled to room temperature at 7°C / min.

[0442] S3.3 Second Time-Limited Processing Stage:

[0443] The ingot was heated to 725°C at 4°C / min, held at that temperature for 8 hours, and then cooled to room temperature at 7°C / min.

[0444] Comparative Example 2

[0445] 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:

[0446] Chromium (Cr): 23.5 wt%

[0447] Molybdenum (Mo): 8.5wt%;

[0448] Iron (Fe): 2.5 wt%

[0449] Copper (Cu): 3.0 wt%

[0450] Aluminum (Al): 0.8 wt%

[0451] Titanium (Ti): 0.5 wt%

[0452] Tungsten (W): 2.5 wt%

[0453] Boron (B): 0.005 wt%

[0454] Yttrium (Y): 0.05 wt%

[0455] Cerium (Ce): 0.04 wt%

[0456] Nickel (Ni): Balance.

[0457] The preparation steps are as follows:

[0458] S1: Melting Steps

[0459] S1.1 Vacuum induction melting raw materials: At 1550℃, maintain for 10... -2 In a low-pressure argon atmosphere, nickel, chromium, molybdenum, tungsten, iron, copper, titanium, yttrium, cerium, and boron are heated, melted, and mixed evenly. After holding at this temperature for 10 minutes, the mixture is cooled to room temperature at 30°C.

[0460] S1.2 Vacuum Arc Remelting:

[0461] The ingot obtained from vacuum induction melting was placed in a vacuum electric arc furnace under the following conditions: melting current of 7 kA, melting speed of 12 mm / min, and vacuum degree of 0.8 Pa. The remelted ingot was then directly transferred to furnace cooling at a temperature above 1000°C.

[0462] S1.3 Furnace Cooling Control:

[0463] The remelted ingot is slowly cooled to 1000°C at 2°C / min, and then rapidly cooled to 500°C at 30°C / min.

[0464] S2: Directional solidification control steps

[0465] S2.1 Heating Stage:

[0466] The ingot is heated from 500℃ to 1520℃ at a rate of 3℃ / min.

[0467] S2.2 First cooling and solidification stage:

[0468] The ingot was cooled to 1200℃ at a rate of 2℃ / min and then drawn at a rate of 0.5mm / min to control the uniformity of cooling and crystallization.

[0469] S2.3 Second cooling and solidification stage:

[0470] The ingot was rapidly cooled to 800°C at a rate of 25°C / min.

[0471] S3: Variable Temperature Multi-Stage Heat Treatment Steps

[0472] S3.1 Solution treatment:

[0473] The ingot was heated to 1140℃ at a rate of 4℃ / min, held for 3 hours, and then oil quenched.

[0474] S3.2 First Time-Limited Processing Stage:

[0475] The ingot was heated to 875°C at 4°C / min, held at that temperature for 10 hours, and then cooled to room temperature at 7°C / min.

[0476] S3.3 Second Time-Limited Processing Stage:

[0477] The ingot was heated to 725°C at 4°C / min, held at that temperature for 8 hours, and then cooled to room temperature at 7°C / min.

[0478] Detection methods

[0479] The following tests were performed on Examples 1-7 and Comparative Examples 1-2:

[0480] 1. The tensile strength and elongation were tested according to GB / T228.1-2021 "Metallic materials - Tensile testing - Part 1: Test method at room temperature".

[0481] 2. The hardness was tested according to GB / T230.1-2018 "Metallic materials Rockwell hardness test - Part 1: Test method".

[0482] 3. Corrosion resistance was tested according to ASTM G28-2002.

[0483] 4. Test the pitting corrosion rate according to ASTM G48 "Determination of pitting potential of metallic materials".

[0484] Performance Indicators Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Comparative Example 1 Comparative Example 2 Tensile Strength (MPa) 862903886924962101110409491124697762 Elongation (%) 29.828.731.318.720.818.716.628.813.742.216.0 Hardness (HB) 230250245280305320345295365190205 Corrosion Rate (mm / year) 0.150.120.140.100.080.070.090.060.050.350.25 Pitting Corrosion Rate (g / m 2 0.23 0.21 0.29 0.18 0.11 0.04 0.09 0.28 0.06 0.82 0.63

[0485] Based on the above test results, it can be seen that the element ratio design of the nickel-based alloy of the present invention, combined with the fine preparation process, achieves better corrosion resistance.

[0486] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

A nickel-based corrosion-resistant alloy is characterized in that, Includes elements with the following weight percentages: Cr: 22-25wt% Mo: 8-10wt% Fe: 1-3wt% Cu: 1.8-3.5 wt% Al: 0.5-1.2 wt% 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: Balance. A nickel-based corrosion-resistant alloy according to claim 1, characterized in that: It also includes niobium, which is 0.8-1.8 wt% by weight. A nickel-based corrosion-resistant alloy according to claim 1, characterized in that: The weight percentage of the Mo element is 9-10 wt%; the weight percentage of the W element is 3-3.5 wt%. A nickel-based corrosion-resistant alloy according to claim 1, characterized in that: The weight percentage of Y element is 0.08-0.12 wt%; the weight percentage of Ce element is 0.05-0.07 wt%. A nickel-based corrosion-resistant alloy according to claim 1, characterized in that: It also includes zirconium, with the zirconium content being 0.01-0.1 wt%. A method for producing a nickel-based corrosion-resistant alloy according to any one of claims 1 to 5, characterized by, Includes the following steps: S1: Precision melting process; The precision smelting process includes three steps: vacuum induction smelting of raw materials, vacuum arc remelting, and precision furnace cooling control. The specific operation of the S1 precision melting step is as follows: S1.1 Vacuum induction melting raw materials: ① At 1400-1450℃, while maintaining for 10 -2 ① Pre-melt the Ni matrix under low-pressure argon gas; ② After the Ni matrix is ​​completely melted, raise the melting temperature to 1500-1550℃ and add chromium, molybdenum, tungsten, and niobium elements in order from high melting point to low melting point; ③ After the elements are fully dissolved, add iron and copper elements at 1550℃; ④ After the elements are fully dissolved, lower the melting temperature to 1500-1520℃ and add titanium; ⑤ After it is completely dissolved, control the melting temperature to 1400-1450℃ and add yttrium, cerium, zirconium, and boron elements; ⑥ After it is completely dissolved, control the melting temperature to 1500-1550℃, hold for 10 minutes, cool at a low speed of 3-5℃ / min to 1400℃, and then rapidly cool to 500-600℃ at 20-30℃ / min. S1.2 Vacuum Arc Remelting: Vacuum induction melting ingots are remelted by vacuum arc under the conditions of melting current of 6-8kA, melting speed of 10-15mm / min, and vacuum degree of 0.5-1Pa to obtain remelted ingots. The remelted ingots are directly transferred to furnace cooling at a temperature above 1000℃. S1.3 Furnace Cooling Control: The remelted ingot is first slowly cooled to 1000℃ at 2-5℃ / min; then rapidly cooled to 500℃ at 20-30℃ / min. S2: Directional solidification control steps; The directional solidification control steps include a heating stage, a first cooling solidification stage, and a second cooling solidification stage, wherein the cooling rate of the first cooling solidification stage is lower than the cooling rate of the second cooling solidification stage. The specific operation of the S2 directional solidification control step is as follows: S2.1 Heating stage: Heat the ingot from 500℃ to 1500-1550℃ at a rate of 3-5℃ / min; S2.2 First cooling and solidification stage: The ingot is cooled to 1200℃ at a low speed of 2-5℃ / min, and then drawn at a speed of 0.1-1mm / min; S2.3 Second cooling and solidification stage: The ingot is rapidly cooled to 800℃ at a rate of 20-30℃ / min; S3: Variable temperature multi-stage heat treatment steps; The variable-temperature multi-stage heat treatment process includes solution treatment, a first aging treatment stage, and 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, hold for 2-4 hours, and then immediately perform oil quenching for rapid cooling; S3.2 First aging treatment stage: Heat the ingot to 850-900℃ at a rate of 3-5℃ / min, hold for 8-12 hours, and then cool to room temperature at a rate of 5-10℃ / min; S3.3 Second aging treatment stage: Heat the ingot to 700-750℃ at a rate of 3-5℃ / min, hold for 6-10 hours, and then cool to room temperature at a rate of 5-10℃ / min.