Nickel-based superalloy added with Y element and preparation method of nickel-based superalloy

Abstract

The invention discloses a nickel-based superalloy added with a Y element and a preparation method of the nickel-based superalloy, and belongs to the technical field of nickel-based superalloy. The alloy comprises the following components in percentage by mass: 0.05 to 0.15 percent of C, 18.0 to 20.0 percent of Cr, 9.0 to 12.0 percent of W, 2.0 to 4.0 percent of Mo, 0.3 to 0.6 percent of Al, 0.3 to 1.0 percent of Mn, 0.25 to 0.75 percent of Si, 0.01 to 0.1 percent of Ti, 1.0 to 4.0 percent of Co, 1.0 to 5.0 percent of Fe, 0.005 to 0.015 percent of B, 0.01 to 0.08 percent of Y and the balance of Ni. The preparation method is simple, the tensile strength, hardness and other mechanical properties of the nickel-based high-temperature alloy are remarkably improved, the creep resistance and oxidation resistance of the alloy in the high-temperature and severe environment are remarkably improved, and the application range of the alloy is widened.

Description

Technical Field

[0001] The invention relates to the technical field of nickel-based high-temperature alloys, and in particular to a nickel-based high-temperature alloy with added Y element and a preparation method thereof. Background Art

[0002] Nickel-based superalloy is a nickel-based alloy material, which is widely used in high-temperature, high-pressure, and corrosive environments such as aerospace, energy, and petrochemicals, and is especially suitable for manufacturing key components such as aircraft engines and gas turbines. This type of alloy has excellent high-temperature strength, oxidation resistance, and hot corrosion resistance, and can maintain good mechanical properties and structural stability in high-temperature environments.

[0003] However, with the continuous improvement of modern industry's requirements for material performance, traditional nickel-based high-temperature alloys still have some limitations in high-temperature environments, such as decreased creep resistance and insufficient oxidation resistance. Among them, in the invention with publication number CN117965922A, Jiangnan University provides a rare earth element Y-doped Ti-Nb-based titanium alloy and its preparation and processing method, the alloy includes 20-30% Nb, 0-5% Y, and the balance is Ti and unavoidable impurity elements. The addition of Y element to the alloy refines the titanium alloy grains, but introduces more defects into the alloy. At the same time, the preparation process of the alloy is long and the cost is high. How to prepare a nickel-based alloy with good high-temperature creep resistance, strong oxidation resistance and high long-term stability is one of the key issues that need to be solved in the alloy field. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a nickel-based high-temperature alloy with added Y element and a preparation method thereof, so as to solve the problems of reduced creep resistance, insufficient oxidation resistance and poor high-temperature stability of existing nickel-based high-temperature alloys under high temperature environment.

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

[0006] A nickel-based high-temperature alloy with added Y element comprises the following components in mass percentage: C 0.05-0.15%, Cr 18.0-20.0%, W 9.0-12.0%, Mo 2.0-4.0%, Al 0.3-0.6%, Mn 0.3-1.0%, Si 0.25-0.75%, Ti 0.01-0.1%, Co 1.0-4.0%, Fe 1.0-5.0%, B 0.005-0.015% and Y 0.01-0.08%, with the balance being Ni.

[0007] The beneficial effects of the present invention are as follows: the present invention adds a trace amount of Y element to the nickel-based high-temperature alloy system, and the Y element can form stable oxides or carbides at the grain boundaries, enhance the corrosion resistance and crack resistance of the grain boundaries, reduce grain boundary sliding and grain boundary brittleness, and play a role in the high-temperature alloy by refining grains, stabilizing grain boundaries, improving oxidation and corrosion resistance, improving mechanical properties, optimizing phase composition, and enhancing thermal fatigue resistance, thereby improving the reliability and service life of the alloy in a high-temperature environment; the Y element is easy to form stable oxides (such as Y2O3), and these oxides can be evenly distributed in the matrix. The oxides can hinder dislocation movement and improve the strength of the alloy; the Y element can also improve the morphology of carbides in the alloy, making them more rounded, reducing stress concentration, and improving High mechanical properties of alloys; when working in a high temperature environment, the Y element can react with oxygen under high temperature conditions to form yttrium oxide (such as Y2O3), which can effectively cover the surface of the alloy, prevent further diffusion of oxygen, and delay the growth of the oxide layer, thereby improving the high-temperature oxidation resistance of the alloy; the Y element is easy to form high-melting point compounds (such as Y2O3, Y2S3) with impurity elements such as oxygen and sulfur. These compounds can be effectively precipitated during the smelting process, thereby purifying the melt and reducing the adverse effects of inclusions on the alloy structure and properties. The reduction of inclusions can significantly improve the fatigue performance and fracture toughness of the alloy. When the alloy is subjected to thermal fatigue or thermal shock, the Y element can inhibit the formation of crack sources and improve the crack resistance of the alloy.

[0008] Further, the invention comprises the following components in mass percentage: C 0.08-0.12%, Cr 18.0-19.0%, W 10.0-11.0%, Mo 2.5-3.0%, Al 0.4-0.5%, Mn 0.5-0.7%, Si 0.4-0.6%, Ti 0.05-0.1%, Co 3.0-4.0%, Fe 3.0-4.0%, B 0.01-0.013% and Y 0.05-0.07%, and the balance is Ni.

[0009] Further, the invention comprises the following components in mass percentage: C 0.08-0.12%, Cr 18.0-19.0%, W 10.0-11.0%, Mo 2.5-3.0%, Al 0.4-0.5%, Mn 0.5-0.7%, Si 0.4-0.6%, Ti 0.05-0.1%, Co 3.0-4.0%, Fe 3.0-4.0%, B 0.01-0.013% and Y 0.05-0.07%, and the balance is Ni.

[0010] The method for preparing the nickel-based high-temperature alloy with added Y element comprises the following steps:

[0011] Firstly, each raw material is subjected to ultrasonic treatment and drying treatment respectively, then the treated raw materials are mixed and subjected to preliminary melting, repeated melting and refining in sequence, and finally cast and molded to obtain the product.

[0012] Furthermore, the conditions of ultrasonic treatment are: frequency 15-25 kHz, and treatment time 20-40 min.

[0013] The beneficial effect of adopting the above further technical solution is: the present invention further removes impurities on the surface of the raw materials through ultrasonic treatment of the raw materials, thereby ensuring the purity of the smelting process.

[0014] Furthermore, the drying conditions are: temperature 100-150° C., time 5-7 h.

[0015] The beneficial effect of adopting the above further technical solution is that the present invention effectively avoids the occurrence of oxidation by performing a drying process in a vacuum environment.

[0016] Furthermore, the initial smelting temperature is 1550-1650°C, the time is 2-5h, and the vacuum degree is 5.0×10 -3 ~7.0×10 -3 Pa.

[0017] The beneficial effect of adopting the above-mentioned further technical solution is as follows: the present invention completely melts the raw materials through a preliminary smelting method of not less than 2 hours, thereby avoiding the occurrence of unmelted particles or uneven mixing, effectively promoting the uniform distribution of the raw materials, and improving the consistency of the materials.

[0018] Furthermore, the conditions for repeated smelting are as follows: the number of repetitions is 5 to 7 times, each smelting time is 5 to 7 minutes, the interval between two smeltings is 20 to 30 minutes, the smelting current is 300 to 400 A, and the vacuum degree is 5.0×10 -3 ~7.0×10 -3 Pa, stirring was carried out during each smelting process, and the crucible was turned over after each smelting.

[0019] The beneficial effects of adopting the above further technical solution are as follows: the present invention helps to further remove impurities and gases in the molten metal through multiple vacuum smelting, improve the purity and performance of the material, ensure the precise control of each smelting time, avoid the effect of impurity removal affected by too long or too short smelting, and control the cooling and reheating process after each smelting, thereby maintaining the continuity and stability of the process.

[0020] Furthermore, the refining temperature is 1450-1550° C., the refining time is 30-50 min, and an inert gas is introduced during the refining process.

[0021] The beneficial effects of adopting the above further technical solution are as follows: the present invention introduces an innovative argon gas purging process based on traditional smelting, that is, adding high-purity argon gas during the smelting process and performing multiple cyclic purging operations. This step can not only remove the residual oxide inclusions in the alloy liquid, but also significantly reduce the gas content, especially the nitrogen and oxygen content, and further improve the purity of the alloy.

[0022] Furthermore, the conditions for casting are: casting temperature is 1400-1500°C, mold preheating temperature is 500-600°C, and casting speed is 10-20kg / min.

[0023] The beneficial effect of adopting the above further technical solution is: the present invention ensures more uniform heat conduction between the mold and the alloy liquid by stably controlling the pouring temperature and mold preheating, thereby reducing the stress concentration problem caused by temperature gradient changes during the molding process.

[0024] The present invention has the following beneficial effects:

[0025] (1) The present invention promotes the formation of a fine grain structure during the solidification process of the alloy by adding rare earth element Y as a grain refiner. By refining the grain structure and improving the internal organization of the alloy, the mechanical properties of the alloy, such as tensile strength and hardness, are significantly improved. The creep resistance and oxidation resistance of the alloy under high temperature and harsh environments are also significantly improved, thereby broadening the application scope of the alloy, and the alloy can be applied to more fields, such as key parts such as the hot end components of aircraft engines and thermal protection systems of spacecraft.

[0026] (2) The preparation method of the present invention is simple, easy to operate and control, and adopts a low-energy consumption and low-emission production process, which reduces the impact on the environment and conforms to the development trend of green manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is the XRD spectrum of each alloy sample in Experimental Example 1;

[0028] Figure 2 The SEM morphology images of the microstructures of the alloy samples in Experimental Example 1, wherein (a) is Comparative Example 1, and (b)-(e) are Examples 1-4, respectively;

[0029] Figure 3 is the microhardness columnar distribution diagram of each alloy sample in Test Example 2;

[0030] Figure 4 : This is the room temperature tensile engineering stress-strain curve of each alloy sample in Test Example 3. DETAILED DESCRIPTION

[0031] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples are only used to explain the present invention and are not used to limit the scope of the present invention. If specific conditions are not specified in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0032] Embodiment 1:

[0033] A method for preparing a nickel-based high-temperature alloy with added Y element, comprising the following steps:

[0034] (1) Materials: Materials are prepared according to the chemical composition ratio of C 0.09wt.%, Cr 19wt.%, W 11.3wt.%, Mo 2.5wt.%, Al0.4wt.%, Mn 0.5wt.%, Si 0.55wt.%, Ti 0.07wt.%, Co 3.1wt.%, Fe 3.4wt.%, B0.013wt.%, Y 0.02wt.%, and Ni balance (wt.%), and then each raw material is subjected to ultrasonic treatment and vacuum drying treatment respectively;

[0035] (2) Preliminary smelting: The raw materials processed in step (1) are placed in a vacuum induction furnace for preliminary smelting at a smelting temperature of 1600°C. During the smelting process, the vacuum degree in the vacuum melting furnace is maintained at 6.0×10 -3 Pa, initial melting time 3h, to ensure that all raw materials are fully melted and evenly mixed;

[0036] (3) Repeated smelting: Each smelting time is 6 minutes, the interval between two smeltings is 25 minutes, the smelting current is 350A, and the vacuum degree is 6.0×10 -3 Pa, a magnetic stirring current of 5 A was applied for 5 stirrings during each melting process, and the crucible was turned over after each melting.

[0037] (4) Refining: The alloy liquid obtained after repeated smelting in step (3) is subjected to refining treatment at a refining temperature of 1500° C. for 40 min. During the refining process, argon gas is introduced for a purging process, which not only effectively removes residual oxide inclusions in the alloy liquid, but also significantly reduces the gas content, especially the nitrogen and oxygen content, thereby further improving the purity of the alloy;

[0038] (5) Casting: The alloy liquid obtained after refining in step (4) is cast into a mold for molding. The mold is preheated to 550°C and its temperature is kept stable at 550±2°C to ensure that the heat conduction between the mold and the alloy liquid is more uniform. The casting temperature is controlled at 1450°C. An intelligent casting system is used to monitor and feedback the casting temperature, speed and temperature changes of the mold in real time, and the key parameters of the casting process are adjusted and optimized in real time. After cooling, a nickel-based high-temperature alloy containing 0.02wt.%Y is obtained.

[0039] Embodiment 2:

[0040] A method for preparing a nickel-based high-temperature alloy with added Y element, comprising the following steps:

[0041] (1) Materials: Materials are prepared according to the chemical composition ratio of C 0.08wt.%, Cr 18.9wt.%, W 10.5wt.%, Mo 2.8wt.%, Al0.3wt.%, Mn 0.4wt.%, Si 0.62wt.%, Ti 0.08wt.%, Co 3.0wt.%, Fe 2.5wt.%, B0.010wt.%, Y 0.04wt.%, and Ni balance (wt.%), and then each raw material is subjected to ultrasonic treatment and vacuum drying treatment respectively;

[0042] (2) Preliminary smelting: The raw materials processed in step (1) are placed in a vacuum induction furnace for preliminary smelting at a smelting temperature of 1600°C. During the smelting process, the vacuum degree in the vacuum melting furnace is maintained at 6.0×10 -3 Pa, initial melting time 3h, to ensure that all raw materials are fully melted and evenly mixed;

[0043] (3) Repeated smelting: Each smelting time is 6 minutes, the interval between two smeltings is 25 minutes, the smelting current is 350A, and the vacuum degree is 6.0×10 -3 Pa, a magnetic stirring current of 5 A was applied for 5 stirrings during each melting process, and the crucible was turned over after each melting.

[0044] (4) Refining: The alloy liquid obtained after repeated smelting in step (3) is subjected to refining treatment at a refining temperature of 1500° C. for 40 min. During the refining process, argon gas is introduced for a purging process, which not only effectively removes residual oxide inclusions in the alloy liquid, but also significantly reduces the gas content, especially the nitrogen and oxygen content, thereby further improving the purity of the alloy;

[0045] (5) Casting: The alloy liquid obtained after refining in step (4) is cast into a mold for molding. The mold is preheated to 550°C and its temperature is kept stable at 550±2°C to ensure that the heat conduction between the mold and the alloy liquid is more uniform. The casting temperature is controlled at 1450°C. An intelligent casting system is used to monitor and feedback the casting temperature, speed and temperature changes of the mold in real time, and the key parameters of the casting process are adjusted and optimized in real time. After cooling, a nickel-based high-temperature alloy containing 0.04wt.%Y is obtained.

[0046] Embodiment 3:

[0047] A method for preparing a nickel-based high-temperature alloy with added Y element, comprising the following steps:

[0048] (1) Materials: Materials are prepared according to the chemical composition ratio of C 0.10wt.%, Cr 18.3wt.%, W 10.8wt.%, Mo 2.6wt.%, Al0.5wt.%, Mn 0.5wt.%, Si 0.51wt.%, Ti 0.08wt.%, Co 3.6wt.%, Fe 3.2wt.%, B0.012wt.%, Y 0.06wt.%, and Ni balance (wt.%), and then each raw material is subjected to ultrasonic treatment and vacuum drying treatment respectively;

[0049] (2) Preliminary smelting: The raw materials processed in step (1) are placed in a vacuum induction furnace for preliminary smelting at a smelting temperature of 1600°C. During the smelting process, the vacuum degree in the vacuum melting furnace is maintained at 6.0×10 -3 Pa, initial melting time 3h, to ensure that all raw materials are fully melted and evenly mixed;

[0050] (3) Repeated smelting: Each smelting time is 6 minutes, the interval between two smeltings is 25 minutes, the smelting current is 350A, and the vacuum degree is 6.0×10 -3 Pa, a magnetic stirring current of 5 A was applied for 5 stirrings during each melting process, and the crucible was turned over after each melting.

[0051] (4) Refining: The alloy liquid obtained after repeated smelting in step (3) is subjected to refining treatment at a refining temperature of 1500° C. for 40 min. During the refining process, argon gas is introduced for a purging process, which not only effectively removes residual oxide inclusions in the alloy liquid, but also significantly reduces the gas content, especially the nitrogen and oxygen content, thereby further improving the purity of the alloy;

[0052] (5) Casting: The alloy liquid obtained after refining in step (4) is cast into a mold for molding. The mold is preheated to 550°C and its temperature is kept stable at 550±2°C to ensure that the heat conduction between the mold and the alloy liquid is more uniform. The casting temperature is controlled at 1450°C. An intelligent casting system is used to monitor and feedback the casting temperature, speed and temperature changes of the mold in real time, and the key parameters of the casting process are adjusted and optimized in real time. After cooling, a nickel-based high-temperature alloy containing 0.06wt.%Y is obtained.

[0053] Embodiment 4:

[0054] A method for preparing a nickel-based high-temperature alloy with added Y element, comprising the following steps:

[0055] (1) Materials: Materials are prepared according to the chemical composition ratio of C 0.09wt.%, Cr 19.2wt.%, W 10.8wt.%, Mo 2.3wt.%, Al0.4wt.%, Mn 0.6wt.%, Si 0.52wt.%, Ti 0.08wt.%, Co 3.5wt.%, Fe 2.8wt.%, B0.012wt.%, Y 0.08wt.%, and Ni balance (wt.%), and then each raw material is subjected to ultrasonic treatment and vacuum drying treatment respectively;

[0056] (2) Preliminary smelting: The raw materials processed in step (1) are placed in a vacuum induction furnace for preliminary smelting at a smelting temperature of 1600°C. During the smelting process, the vacuum degree in the vacuum melting furnace is maintained at 6.0×10 -3 Pa, initial melting time 3h, to ensure that all raw materials are fully melted and evenly mixed;

[0057] (3) Repeated smelting: Each smelting time is 6 minutes, the interval between two smeltings is 25 minutes, the smelting current is 350A, and the vacuum degree is 6.0×10 -3 Pa, a magnetic stirring current of 5 A was applied for 5 stirrings during each melting process, and the crucible was turned over after each melting.

[0058] (4) Refining: The alloy liquid obtained after repeated smelting in step (3) is subjected to refining treatment at a refining temperature of 1500° C. for 40 min. During the refining process, argon gas is introduced for a purging process, which not only effectively removes residual oxide inclusions in the alloy liquid, but also significantly reduces the gas content, especially the nitrogen and oxygen content, thereby further improving the purity of the alloy;

[0059] (5) Casting: The alloy liquid obtained after refining in step (4) is cast into a mold for molding. The mold is preheated to 550°C and its temperature is kept stable at 550±2°C to ensure that the heat conduction between the mold and the alloy liquid is more uniform. The casting temperature is controlled at 1450°C. An intelligent casting system is used to monitor and feedback the casting temperature, speed and temperature changes of the mold in real time, and the key parameters of the casting process are adjusted and optimized in real time. After cooling, a nickel-based high-temperature alloy containing 0.08wt.%Y is obtained.

[0060] Comparative Example 1:

[0061] A method for preparing a nickel-based high-temperature alloy with added Y element, comprising the following steps:

[0062] (1) Materials: Materials are prepared according to the chemical composition ratio of C 0.08wt.%, Cr 18.5wt.%, W 11.3wt.%, Mo 2.9wt.%, Al0.4wt.%, Mn 0.5wt.%, Si 0.51wt.%, Ti 0.08wt.%, Co 3.5wt.%, Fe 3.1wt.%, B0.011wt.%, and Ni balance (wt.%), and then each raw material is subjected to ultrasonic treatment and vacuum drying treatment respectively;

[0063] (2) Preliminary smelting: The raw materials processed in step (1) are placed in a vacuum induction furnace for preliminary smelting at a smelting temperature of 1600°C. During the smelting process, the vacuum degree in the vacuum melting furnace is maintained at 6.0×10 -3 Pa, initial melting time 3h, to ensure that all raw materials are fully melted and evenly mixed;

[0064] (3) Repeated smelting: Each smelting time is 6 minutes, the interval between two smeltings is 25 minutes, the smelting current is 350A, and the vacuum degree is 6.0×10 -3 Pa, a magnetic stirring current of 5 A was applied for 5 stirrings during each melting process, and the crucible was turned over after each melting.

[0065] (4) Refining: The alloy liquid obtained after repeated smelting in step (3) is subjected to refining treatment at a refining temperature of 1500° C. for 40 min. During the refining process, argon gas is introduced for a purging process, which not only effectively removes residual oxide inclusions in the alloy liquid, but also significantly reduces the gas content, especially the nitrogen and oxygen content, thereby further improving the purity of the alloy;

[0066] (5) Casting: The alloy liquid obtained after refining in step (4) is cast into a mold for molding. The mold is preheated to 550°C and its temperature is kept stable at 550±2°C to ensure that the heat conduction between the mold and the alloy liquid is more uniform. The casting temperature is controlled at 1450°C. An intelligent casting system is used to monitor and feedback the casting temperature, speed and temperature changes of the mold in real time, and the key parameters of the casting process are adjusted and optimized in real time. After cooling, a nickel-based high-temperature alloy without Y addition is obtained.

[0067] Experimental Example 1: XRD and SEM Characterization

[0068] X-ray diffraction image characterization and scanning electron microscope test were performed on the nickel-based high-temperature alloys prepared in Examples 1-4 of the present invention and Comparative Example 1. The XRD sample size was 10 mm×10 mm×5 mm, the specific scanning angle range was 30-100°, and the scanning speed was 2° / min.

[0069] The experimental results are as follows Figure 1 and Figure 2 As shown, the results show that the internal phase composition of each alloy prepared in Examples 1-4 of the present invention and Comparative Example 1 is a single γ phase.

[0070] Test Example 2: Microhardness Characterization

[0071] The microhardness test of the alloy samples prepared in Examples 1-4 and Comparative Example 1 was performed using a digital Vickers hardness tester. The sample size was 10 mm×10 mm×5 mm. The load size and loading time applied by the test probe were 200 g and 10 s, respectively.

[0072] The experimental results are as follows Figure 3 The results show that compared with the alloy sample without Y addition (Comparative Example 1), the microhardness of the alloy sample prepared in Example 1 of the present invention is significantly increased, among which the microhardness of the alloy sample prepared in Example 3 is the highest, reaching 241HV 0.2 , while the microhardness of the alloy sample prepared in Comparative Example 1 can only reach 202HV 0.2 With the increase of the Y element content in the alloy components, the microhardness of the alloys in each example increases first and then decreases.

[0073] Test Example 3: Stress-Strain Characterization

[0074] A universal mechanical testing machine was used to test the room temperature tensile properties of the alloy samples prepared in Examples 1-4 and Comparative Example 1. The size of the tensile sample was 40 mm×6 mm×2 mm, and the tensile rate was 1.2 mm / min until the tensile sample was broken.

[0075] The experimental results are as follows Figure 4As shown. The results show that compared with the alloy sample without Y addition (Comparative Example 1), the tensile strength of the alloy samples obtained in Examples 1-4 of the present invention is significantly increased, and the elongation is slightly decreased. Among them, the tensile strength of the sample of Example 4 is the highest, reaching 703MPa, and the tensile strength of the alloy sample without Y addition can only reach 653MPa. The elongation of the alloy obtained in Comparative Example 1 is relatively high, reaching 73%, and the elongation of the alloy in Example 2 of the embodiment is the largest, reaching 63%. With the increase of the Y content, the tensile strength of the alloy in each embodiment shows a law of first rising and then falling, and the elongation gradually decreases. The alloy obtained in Example 3 has the best comprehensive tensile mechanical properties, with a tensile strength of 703MPa and an elongation of 53%.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A nickel-based high-temperature alloy with added Y element, characterized in that: The invention comprises the following components in mass percentage: C 0.05-0.15%, Cr 18.0-20.0%, W 9.0-12.0%, Mo 2.0-4.0%, Al 0.3-0.6%, Mn 0.3-1.0%, Si 0.25-0.75%, Ti 0.01-0.1%, Co 1.0-4.0%, Fe 1.0-5.0%, B 0.005-0.015% and Y 0.01-0.08%, and the balance is Ni.

2. The nickel-based high-temperature alloy with added Y element according to claim 1, characterized in that: The invention comprises the following components in mass percentage: C 0.08-0.12%, Cr 18.0-19.0%, W 10.0-11.0%, Mo 2.5-3.0%, Al 0.4-0.5%, Mn 0.5-0.7%, Si 0.4-0.6%, Ti 0.05-0.1%, Co 3.0-4.0%, Fe 3.0-4.0%, B 0.01-0.013% and Y 0.05-0.07%, and the balance is Ni.

3. The nickel-based high-temperature alloy with added Y element according to claim 1, characterized in that: The invention comprises the following components in mass percentage: C 0.08-0.12%, Cr 18.0-19.0%, W 10.0-11.0%, Mo 2.5-3.0%, Al 0.4-0.5%, Mn 0.5-0.7%, Si 0.4-0.6%, Ti 0.05-0.1%, Co 3.0-4.0%, Fe 3.0-4.0%, B 0.01-0.013% and Y 0.05-0.07%, and the balance is Ni.

4. The method for preparing the nickel-based high-temperature alloy with added Y element according to any one of claims 1 to 3, characterized in that: The following steps are involved: Firstly, each raw material is subjected to ultrasonic treatment and drying treatment respectively, then the treated raw materials are mixed and subjected to preliminary melting, repeated melting and refining in sequence, and finally cast and molded to obtain the product.

5. The method for preparing the nickel-based high-temperature alloy with added Y element according to claim 4, characterized in that: The conditions of the ultrasonic treatment are: frequency 15-25 kHz, and treatment time 20-40 min.

6. The method for preparing the nickel-based high-temperature alloy with added Y element according to claim 4, characterized in that: The drying conditions are as follows: temperature 100-150° C., time 5-7 hours.

7. The method for preparing the nickel-based high-temperature alloy with added Y element according to claim 4, characterized in that: The temperature of the preliminary smelting is 1550-1650°C, the time is 2-5 hours, and the vacuum degree is 5.0×10 -3 ~7.0×10 -3 Pa.

8. The method for preparing the nickel-based high-temperature alloy with added Y element according to claim 4, characterized in that: The conditions for repeated smelting are: the number of repetitions is 5 to 7 times, the smelting time for each time is 5 to 7 minutes, the interval between two smeltings is 20 to 30 minutes, the smelting current is 300 to 400A, and the vacuum degree is 5.0×10 -3 ~7.0×10 -3 Pa, stirring was carried out during each smelting process, and the crucible was turned over after each smelting.

9. The method for preparing the nickel-based high-temperature alloy with added Y element according to claim 4, characterized in that: The refining temperature is 1450-1550° C., the refining time is 30-50 minutes, and inert gas is introduced during the refining process.

10. The method for preparing the nickel-based high-temperature alloy with added Y element according to claim 4, characterized in that: The conditions for casting are: casting temperature is 1400-1500°C, mold preheating temperature is 500-600°C, and casting speed is 10-20kg / min.

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