ODS-CoCrFeNi high-entropy alloy based on 3D printing and preparation method thereof

Abstract

The invention discloses an ODS-CoCrFeNi high-entropy alloy based on 3D printing and a preparation method of the ODS-CoCrFeNi high-entropy alloy, and belongs to the technical field of high-entropy alloy preparation. The ODS-CoCrFeNi high-entropy alloy based on 3D printing is prepared from the following raw materials in percentage by mass: 22 percent to 28 percent of Co, 19 percent to 25 percent of Cr, 21 percent to 27 percent of Fe, 22 percent to 28 percent of Ni and 0.1 percent to 0.5 percent of Y2O3. The prepared high-entropy alloy is an ODS-high-entropy alloy with high strength and low hydrogen embrittlement sensitivity, the high-entropy alloy is prepared from the raw materials according to the mass fraction ratio, the density of the high-entropy alloy is 8.0 g / cm < 3 >-8.3 g / cm < 3 >, the tensile strength of the high-entropy alloy is 670 MPa-743 MPa, the percentage elongation after fracture of the high-entropy alloy is 28%-39%, and the tensile plasticity loss of a sample under the hydrogen charging condition is only 2% compared with that in air.

Description

Technical Field

[0001] This invention relates to the field of high-entropy alloy preparation technology, specifically to an ODS-CoCrFeNi high-entropy alloy based on 3D printing and its preparation method. Background Technology

[0002] With the continuous innovation and development of hydrogen fuel cell vehicles, key components of on-board hydrogen storage systems need to withstand more demanding operating conditions such as high temperature, high pressure, and corrosiveness. However, existing component materials have low strength, and their sensitivity to hydrogen embrittlement increases with the increasing pressure of the hydrogen environment during service, failing to meet the safety requirements of future hydrogen storage containers. Therefore, the development of core pressure-bearing component materials that meet future service conditions is urgently needed. High-entropy alloys, as a novel type of alloy, were first reported in 2004. They are composed of five or more main elements in equimolar or near-equimolar ratios, and their unique composition and structure endow them with four core effects. At the same time, high-entropy alloys also possess superior properties that traditional alloys cannot match, such as high strength and toughness, high hardness, high wear resistance, high thermal resistance, high resistivity, and high-temperature oxidation resistance. Therefore, high-entropy alloys can broaden the service range of materials and have been extensively studied.

[0003] CoCrFeNi high-entropy alloy (HEA) has a low stacking fault energy (31.7 mJ / m). 2 During plastic deformation, nanotwins are formed, resulting in excellent plasticity. It has been reported that, under the same hydrogen-filled conditions, comparing the plasticity and tensile strength of high-entropy alloys and traditional alloys, multi-principal-element alloys exhibit less plasticity loss and higher resistance to hydrogen embrittlement. However, the face-centered cubic (FCC) CoCrFeNi high-entropy alloy has relatively low strength. Oxide dispersion strengthening (ODS) can be used as a strengthening method to improve the material's strength. Simultaneously, by precipitating a second phase in situ, the inward diffusion and migration of hydrogen can be slowed down through a trapping effect, reducing the tendency for hydrogen-induced intergranular cracking and thus improving the alloy's resistance to hydrogen embrittlement.

[0004] Traditional methods for preparing ODS-alloys via mechanical alloying combined with thermosolarization are time-consuming, and the formed samples require subsequent processes such as rolling, heat treatment, and welding. This complex preparation process affects production efficiency and significantly increases manufacturing costs. Laser powder bed melting technology can directly deposit alloy powder layer by layer into parts with complex shapes, offering advantages such as high material utilization, shorter preparation cycles, lower costs, and greater flexibility. Currently, research on 3D printing methods for preparing ODS-high entropy alloys is limited. Summary of the Invention

[0005] The purpose of this invention is to provide a 3D-printed ODS-CoCrFeNi high-entropy alloy and its preparation method, which solves the technical problem that the materials of the components of the existing vehicle hydrogen storage system have low strength and increase hydrogen embrittlement sensitivity with the increase of hydrogen environmental pressure, thus failing to meet the safety requirements of future hydrogen storage containers.

[0006] To achieve the above objectives, one embodiment of the present invention provides a 3D-printed ODS-CoCrFeNi high-entropy alloy, comprising the following raw materials in the indicated mass percentages:

[0007] Co: 22%-28%, Cr: 19%-25%, Fe: 21%-27%, Ni: 22%-28%, Y2O3: 0.1%-0.5%.

[0008] One preferred embodiment of the present invention is an ODS-CoCrFeNi high-entropy alloy comprising the following raw materials in the indicated mass percentages: Co: 23%-26%, Cr: 20%-23%, Fe: 21%-24%, Ni: 24%-27%, Y2O3: 0.1%-0.3%.

[0009] Based on the 3D-printed ODS-CoCrFeNi high-entropy alloy disclosed in this invention, this invention also discloses a method for preparing the 3D-printed ODS-CoCrFeNi high-entropy alloy, comprising the following steps:

[0010] Preparation of high-entropy alloy powder;

[0011] High-entropy alloy powder was mixed with nano-yttrium oxide, and then dried.

[0012] The dried mixed powder was 3D printed to obtain a high-entropy alloy.

[0013] One preferred embodiment of the present invention is the preparation of high-entropy alloy powder, comprising:

[0014] The ingredients are proportioned according to mass percentage and then melted into a liquid alloy.

[0015] The alloy liquid is atomized and then solidified to obtain high-entropy alloy powder.

[0016] One preferred embodiment of the present invention involves mixing high-entropy alloy powder with nano-yttrium oxide, which includes screening the high-entropy alloy powder before mixing it with nano-yttrium oxide, wherein the screened particle size is 15μm-53μm.

[0017] One preferred embodiment of the present invention includes a drying process comprising: a vacuum degree of 280 Pa to 320 Pa, a drying temperature of 100 °C to 140 °C, and a drying time of 1.5 h to 2.5 h.

[0018] One preferred embodiment of the present invention is to 3D print dried mixed powder, comprising: placing the dried mixed powder in a 3D printer, setting the 3D printer process parameters, and completing the printing.

[0019] One preferred embodiment of the present invention involves placing the dried mixed powder inside a 3D printer, including mounting a substrate on the 3D printer and performing height calibration.

[0020] One preferred embodiment of the present invention includes process parameters such as 3D printer power, laser spot diameter, scanning speed, scanning spacing, powder layer thickness, scanning path, and interlayer rotation angle.

[0021] In one preferred embodiment of the present invention, the process parameters are determined based on the average temperature of the molten pool and the temperature fluctuation range.

[0022] In summary, the beneficial effects of the present invention are as follows:

[0023] 1. The high-entropy alloy prepared by this invention is a high-strength, low-hydrogen-embrittlement-sensitive ODS-high-entropy alloy. The high-entropy alloy prepared from raw materials in the specified mass fraction has a density of 8.0 g / cm³. 3 -8.3g / cm 3 The tensile strength is 670MPa-743MPa, the elongation after fracture is 28%-39%, and the loss of tensile plasticity of the specimen under hydrogen-filled conditions is only 2% compared with that under air.

[0024] 2. This invention provides a high-strength, low-hydrogen-embrittlement-sensitive ODS-HEA and its preparation method, which can realize the rapid laser preparation of ODS-CoCrFeNi high-entropy alloys. At the same time, the laser powder bed melting technology also has the advantages of simple operation, high efficiency, and the ability to form complex components in one step.

[0025] 3. This invention can efficiently prepare ODS-CoCrFeNi high-entropy alloy, with advantages of high material utilization and large design freedom. It solves the problems of long preparation cycle, need for subsequent processing, and element segregation of conventional methods, and can meet the requirements of complex structures of key pressure-bearing components of hydrogen storage containers.

[0026] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention will be apparent from the effects described in the description and the drawings. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the process for preparing ODS-CoCrFeNi high-entropy alloy based on 3D printing in this invention.

[0028] Figure 2 The stress-strain curves of the ODS-CoCrFeNi high-entropy alloys prepared in Examples 1-3 of this invention are shown.

[0029] Figure 3 The stress-strain curves of the ODS-CoCrFeNi high-entropy alloys prepared in Examples 2, 4 and 5 of this invention are shown.

[0030] Figure 4 The tensile stress-strain curves of the ODS-CoCrFeNi high-entropy alloy prepared in Example 4 of this invention under air and hydrogen-filled conditions are shown.

[0031] Figure 5 This is a tensile stress-strain curve of the high-entropy alloy prepared in Comparative Example 1 of the present invention under air conditions. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] This invention provides a 3D-printed ODS-CoCrFeNi high-entropy alloy, comprising the following raw materials in the following mass percentage ratios: Co: 22%-28%, Cr: 19%-25%, Fe: 21%-27%, Ni: 22%-28%, Y2O3: 0.05%-0.15%;

[0034] Preferably, the ODS-CoCrFeNi high-entropy alloy comprises the following raw materials in the following mass percentage ratios: Co: 23%-26%, Cr: 20%-23%, Fe: 21%-24%, Ni: 24%-27%, Y2O3: 0.08%-0.13%, and further, Y2O3: 0.1%.

[0035] A method for preparing ODS-CoCrFeNi high-entropy alloy based on 3D printing, such as Figure 1 As shown, it includes the following steps:

[0036] Step (1): Prepare high-entropy alloy powder; specifically, including:

[0037] Step (101): Prepare the raw materials according to the mass percentage and melt them into an alloy liquid; specifically, according to the target composition requirements of ODS-HEA, prepare the Co, Cr, Fe and Ni blocks with a purity of ≥99.9% according to the mass percentage and melt them into an alloy liquid.

[0038] Step (102): The alloy liquid is atomized and solidified to obtain high-entropy alloy powder; specifically, the alloy liquid is atomized into fine droplets by high-speed airflow, and the atomized droplets are rapidly solidified into high-entropy alloy powder in a closed atomization tube.

[0039] Step (2): Mix high-entropy alloy powder with nano-yttrium oxide, and then dry the mixture. Specifically, select alloy powder with a particle size of 15μm-53μm, mix the alloy powder with 0.1wt% nano-yttrium oxide using a powder mixer, and dry the mixed powder in a vacuum drying oven with a vacuum degree of 300Pa, a temperature of 120℃, and a time of 2h. Then cool the powder to room temperature in the furnace and store it in a vacuum-sealed container.

[0040] Step (3): 3D printing the dried mixed powder to obtain a high-entropy alloy; high-strength, low-hydrogen-embrittlement-sensitive high-entropy alloy can be obtained by printing the dried mixed powder using laser powder bed melting technology; specifically, including:

[0041] Step (301): Based on the average molten pool temperature of 1.6T m ≤T≤2.0T m The principle of temperature fluctuation range W≤150℃ was used to optimize process parameters such as laser output power, laser spot diameter, and scanning speed, among which T m The melting point of the CoCrFeNi high-entropy alloy;

[0042] Step (302): Obtain the following preliminary optimized process parameters: laser output power is 100W-200W, laser spot diameter is 0.1mm, and scanning speed is 800mm / s-1200mm / s;

[0043] Step (303): Use 304 stainless steel plate as substrate, grind its surface until there are no oxides, clean the oil and dirt on the surface with organic solvent, and then install the substrate on the platform of the molding chamber and perform height calibration.

[0044] Step (304): Place the mixed powder obtained in step (2) into the powder cylinder of the 3D printer, set the power of the 3D printer to 100W-200W, the laser spot diameter to 0.1mm, the scanning speed to 800mm / s-1200mm / s, the scanning spacing to 60μm, the powder layer thickness to 30μm, the scanning path to be a cross path, and the interlayer rotation angle to 67°. The 3D printer is the S210A model 3D printing equipment manufactured by BLT.

[0045] Step (305): Perform 3D printing according to the above process parameters. After printing, the parts are cooled with the chamber and sampled after 1 hour. A high-density, uniform structure and excellent performance ODS-CoCrFeNi high-entropy alloy forming part is prepared. The size of the printed forming part is 55mm×15mm×8mm.

[0046] Example 1

[0047] A method for preparing ODS-CoCrFeNi high-entropy alloy based on 3D printing includes the following steps:

[0048] Step 1: Prepare the following composition according to the mass percentage: Co: 26%, Cr: 24%, Fe: 24%, Ni: 26%; atomize the above composition to form spherical alloy powder with a purity ≥ 99.9% and a size of 15-53μm;

[0049] Step 2: Mix the alloy powder with 0.1 wt% nano-yttrium oxide using a powder mixer. Dry the mixed powder in a vacuum drying oven at a vacuum degree of 300 Pa, a temperature of 120 °C, and a time of 2 hours. Then, cool it to room temperature in the oven and store it in a vacuum-sealed container. Use laser powder bed melting technology to print the dried mixed powder to obtain a high-strength, low-hydrogen-embrittlement-sensitive high-entropy alloy.

[0050] Step 3: Place the alloy powder obtained in Step 2 into the powder cylinder of the 3D printer, clean the substrate, install it on the platform, and perform height calibration.

[0051] Step 4: Set the 3D printer power to 100W, laser spot diameter to 0.1mm, scanning speed to 1000mm / s, scanning spacing to 60μm, powder layer thickness to 30μm, scanning path to intersecting paths, and interlayer rotation angle to 67°. Start the device to print.

[0052] Step 5: After printing, wait 1 hour before taking a sample.

[0053] Example 2

[0054] A method for preparing ODS-CoCrFeNi high-entropy alloy based on 3D printing includes the following steps:

[0055] Step 1: Prepare the following composition according to the mass percentage: Co: 26%, Cr: 24%, Fe: 24%, Ni: 26%; atomize the above composition to form spherical alloy powder with a purity ≥ 99.9% and a size of 15-53μm;

[0056] Step 2: Mix the alloy powder with 0.1 wt% nano-yttrium oxide using a powder mixer. Dry the mixed powder in a vacuum drying oven at a vacuum degree of 300 Pa, a temperature of 120 °C, and a time of 2 hours. Then, cool it to room temperature in the oven and store it in a vacuum-sealed container. Use laser powder bed melting technology to print the dried mixed powder to obtain a high-strength, low-hydrogen-embrittlement-sensitive high-entropy alloy.

[0057] Step 3: Place the alloy powder obtained in Step 2 into the powder cylinder of the 3D printer, clean the substrate, install it on the platform, and perform height calibration.

[0058] Step 4: Set the 3D printer power to 150W, laser spot diameter to 0.1mm, scanning speed to 1000mm / s, scanning spacing to 60μm, powder layer thickness to 30μm, scanning path to intersecting paths, and interlayer rotation angle to 67°. Start the device to print.

[0059] Step 5: After printing, wait 1 hour before taking a sample.

[0060] Example 3

[0061] A method for preparing ODS-CoCrFeNi high-entropy alloy based on 3D printing includes the following steps:

[0062] Step 1: Prepare the following composition according to the mass percentage: Co: 26%, Cr: 24%, Fe: 24%, Ni: 26%; atomize the above composition to form spherical alloy powder with a purity ≥ 99.9% and a size of 15-53μm;

[0063] Step 2: Mix the alloy powder with 0.1 wt% nano-yttrium oxide using a powder mixer. Dry the mixed powder in a vacuum drying oven at a vacuum degree of 300 Pa, a temperature of 120 °C, and a time of 2 hours. Then, cool it to room temperature in the oven and store it in a vacuum-sealed container. Use laser powder bed melting technology to print the dried mixed powder to obtain a high-strength, low-hydrogen-embrittlement-sensitive high-entropy alloy.

[0064] Step 3: Place the alloy powder obtained in Step 2 into the powder cylinder of the 3D printer, clean the substrate, install it on the platform, and perform height calibration.

[0065] Step 4: Set the 3D printer power to 200W, laser spot diameter to 0.1mm, scanning speed to 1000mm / s, scanning spacing to 60μm, powder layer thickness to 30μm, scanning path to intersecting paths, and interlayer rotation angle to 67°. Start the device to print.

[0066] Step 5: After printing, wait 1 hour before taking a sample.

[0067] Example 4

[0068] A method for preparing ODS-CoCrFeNi high-entropy alloy based on 3D printing includes the following steps:

[0069] Step 1: Prepare the following composition according to the mass percentage: Co: 26%, Cr: 24%, Fe: 24%, Ni: 26%; atomize the above composition to form spherical alloy powder with a purity ≥ 99.9% and a size of 15-53μm;

[0070] Step 2: The alloy powder is mixed with 0.3 wt% nano-yttrium oxide using a powder mixer. The mixed powder is then dried in a vacuum drying oven at a vacuum degree of 300 Pa, a temperature of 120 °C, and a time of 2 hours. After drying, the powder is cooled to room temperature in the oven and then sealed in a vacuum. The dried mixed powder is then printed using laser powder bed melting technology to obtain a high-strength, low-hydrogen-embrittlement-sensitive high-entropy alloy.

[0071] Step 3: Place the alloy powder obtained in Step 2 into the powder cylinder of the 3D printer, clean the substrate, install it on the platform, and perform height calibration.

[0072] Step 4: Set the 3D printer power to 150W, laser spot diameter to 0.1mm, scanning speed to 1000mm / s, scanning spacing to 60μm, powder layer thickness to 30μm, scanning path to intersecting paths, and interlayer rotation angle to 67°. Start the device to print.

[0073] Step 5: After printing, wait 1 hour before taking a sample.

[0074] Example 5

[0075] A method for preparing ODS-CoCrFeNi high-entropy alloy based on 3D printing includes the following steps:

[0076] Step 1: Prepare the following composition according to the mass percentage: Co: 26%, Cr: 24%, Fe: 24%, Ni: 26%; atomize the above composition to form spherical alloy powder with a purity ≥ 99.9% and a size of 15-53μm;

[0077] Step 2: The alloy powder is mixed with 0.5 wt% nano-yttrium oxide using a powder mixer. The mixed powder is then dried in a vacuum drying oven at a vacuum degree of 300 Pa, a temperature of 120 °C, and a time of 2 hours. After drying, the powder is cooled to room temperature in the oven and then sealed in a vacuum. The dried mixed powder is then printed using laser powder bed melting technology to obtain a high-strength, low-hydrogen-embrittlement-sensitive high-entropy alloy.

[0078] Step 3: Place the alloy powder obtained in Step 2 into the powder cylinder of the 3D printer, clean the substrate, install it on the platform, and perform height calibration.

[0079] Step 4: Set the 3D printer power to 150W, laser spot diameter to 0.1mm, scanning speed to 1000mm / s, scanning spacing to 60μm, powder layer thickness to 30μm, scanning path to intersecting paths, and interlayer rotation angle to 67°. Start the device to print.

[0080] Step 5: After printing, wait 1 hour before taking a sample.

[0081] Comparative Example 1

[0082] A method for preparing a high-entropy alloy includes the following steps:

[0083] Step 1: Prepare the following composition according to the mass percentage: Co: 24.9%, Cr: 24.9%, Fe: 25%, Ni: 24.9%, Y: 0.3%; atomize the above composition to form spherical alloy powder with a purity ≥99.9% and a size of 15-53μm;

[0084] Step 2: The alloy powder is dried in a vacuum drying oven at a vacuum level of 300 Pa, a temperature of 120°C, and a time of 2 hours. It is then cooled to room temperature in the oven and sealed under vacuum. The dried powder mixture is then printed using laser powder bed melting technology to obtain a high-strength, low-hydrogen-embrittlement-sensitive high-entropy alloy.

[0085] Step 3: Place the alloy powder obtained in Step 2 into the powder cylinder of the 3D printer, clean the substrate, install it on the platform, and perform height calibration.

[0086] Step 4: Set the 3D printer power to 150W, laser spot diameter to 0.1mm, scanning speed to 1000mm / s, scanning spacing to 60μm, powder layer thickness to 30μm, scanning path to intersecting paths, and interlayer rotation angle to 67°. Start the device to print.

[0087] Step 5: After printing, wait 1 hour before taking a sample.

[0088] Testing and Inspection

[0089] (1) The performance of the ODS-CoCrFeNi high-entropy alloys prepared in Examples 1-5 and the high-entropy alloy prepared in Comparative Example 1 was tested. The performance test results are shown in Table 1. The stress-strain curves of Examples 1-3 are shown in Table 1. Figure 2 The stress-strain curves of Examples 2, 4, and 5 are as follows: Figure 3 As shown.

[0090] Table 1: Properties of the high-entropy alloys prepared in Examples 1-5 and Comparative Example 1

[0091]

[0092] From Table 1, Figure 2 and Figure 3 As can be seen from the above, the ODS-CoCrFeNi high-entropy alloys prepared by Examples 1-5 of the present invention under different processes have excellent performance. Among them, the addition of 0.3% can enhance the strength of the material and enhance its resistance to hydrogen embrittlement. In Comparative Example 1, changing the way nano-yttrium oxide is introduced will have a negative impact on the performance of the high-entropy alloy.

[0093] (2) The ODS-CoCrFeNi high-entropy alloy prepared in Example 4 was subjected to tensile stress-strain tests under air and hydrogen-filled conditions, respectively. The test results are as follows: Figure 4 As shown.

[0094] from Figure 4 As can be seen from the above, the ODS-CoCrFeNi high-entropy alloy sample prepared in Example 4 has only 2% loss of tensile plasticity under hydrogen-filled conditions compared to tensile plasticity under air conditions, while retaining a tensile strength of 630 MPa.

[0095] (3) The high-entropy alloy prepared in Comparative Example 1 was subjected to tensile stress-strain tests under air conditions. The test results are as follows: Figure 5 As shown.

[0096] from Figure 3 and Figure 5 The comparison shows that the tensile strength of the high-entropy alloy prepared in Comparative Example 1 is significantly lower than that of the ODS-CoCrFeNi high-entropy alloys prepared in Examples 2, 4 and 5; at the same time, the high-entropy alloy prepared in Comparative Example 1 has poor toughness.

[0097] In summary, the preparation method of this invention can rapidly prepare high-strength, low-hydrogen-embrittlement-sensitive ODS-CoCrFeNi high-entropy alloys.

[0098] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A high-entropy ODS-CoCrFeNi alloy based on 3D printing, characterized in that, Includes the following raw materials in the following weight percentages: Co: 22%-28%, Cr: 19%-25%, Fe: 21%-27%, Ni: 22%-28%, Y2O3: 0.1%-0.5%.

2. The ODS-CoCrFeNi high-entropy alloy based on 3D printing as described in claim 1, characterized in that, The ODS-CoCrFeNi high-entropy alloy comprises the following raw materials in the following mass percentage ratios: Co: 23%-26%, Cr: 20%-23%, Fe: 21%-24%, Ni: 24%-27%, Y2O3: 0.1%-0.3%.

3. A method for preparing an ODS-CoCrFeNi high-entropy alloy based on 3D printing according to any one of claims 1-2, characterized in that, Includes the following steps: Preparation of high-entropy alloy powder; The high-entropy alloy powder was mixed with nano-yttrium oxide, and then dried. The dried mixed powder was 3D printed to obtain a high-entropy alloy.

4. The method for preparing ODS-CoCrFeNi high-entropy alloy based on 3D printing as described in claim 3, characterized in that, The preparation of high-entropy alloy powder includes: The ingredients are proportioned according to mass percentage and then melted into a liquid alloy. The alloy liquid is atomized and solidified to obtain high-entropy alloy powder.

5. The method for preparing ODS-CoCrFeNi high-entropy alloy based on 3D printing as described in claim 3, characterized in that, The process of mixing the high-entropy alloy powder with nano-yttrium oxide includes: screening the high-entropy alloy powder before mixing it with nano-yttrium oxide, wherein the screened particle size is 15μm-53μm.

6. The method for preparing ODS-CoCrFeNi high-entropy alloy based on 3D printing as described in claim 3, characterized in that, The drying process includes: a vacuum degree of 280Pa-320Pa, a drying temperature of 100℃-140℃, and a drying time of 1.5h-2.5h.

7. The method for preparing ODS-CoCrFeNi high-entropy alloy based on 3D printing as described in claim 3, characterized in that: The process of 3D printing the dried mixed powder includes: placing the dried mixed powder into the 3D printer, setting the 3D printer process parameters, and completing the printing.

8. The method for preparing ODS-CoCrFeNi high-entropy alloy based on 3D printing as described in claim 7, characterized in that, The step of placing the dried mixed powder into the 3D printer includes: mounting the substrate on the 3D printer and performing height calibration.

9. The method for preparing ODS-CoCrFeNi high-entropy alloy based on 3D printing as described in claim 7, characterized in that: The process parameters include 3D printer power, laser spot diameter, scanning speed, scanning spacing, powder layer thickness, scanning path, and interlayer rotation angle.

10. The method for preparing ODS-CoCrFeNi high-entropy alloy based on 3D printing as described in claim 9, characterized in that: The process parameters are determined based on the average temperature of the molten pool and the temperature fluctuation range.

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