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CN-121992272-A - ODS-CoCrFeNi high-entropy alloy based on 3D printing and preparation method thereof

CN121992272ACN 121992272 ACN121992272 ACN 121992272ACN-121992272-A

Abstract

The invention discloses an ODS-CoCrFeNi high-entropy alloy based on 3D printing and a preparation method thereof, belonging to the technical field of high-entropy alloy preparation. The ODS-CoCrFeNi high-entropy alloy based on 3D printing comprises, by mass, 22% -28% of Co, 19% -25% of Cr, 21% -27% of Fe, 22% -28% of Ni and 0.1% -0.5% of Y 2 O 3 . The high-entropy alloy prepared by the invention is high-strength low-hydrogen embrittlement sensitivity ODS-high-entropy alloy, the density of the high-entropy alloy is 8.0g/cm 3 -8.3g/cm 3 , the tensile strength is 670MPa-743MPa, the elongation after break is 28% -39%, and the tensile plastic loss of a sample under the condition of hydrogen charging is only 2% compared with that in air.

Inventors

  • PENG SHIBO
  • BAI QIANG
  • XU YAN
  • ZHANG HONGBO
  • YANG FENGPING

Assignees

  • 中国石油天然气集团有限公司
  • 中国石油集团工程材料研究院有限公司
  • 北京隆盛泰科石油管科技有限公司

Dates

Publication Date
20260508
Application Date
20241108

Claims (10)

  1. 1. The ODS-CoCrFeNi high-entropy alloy based on 3D printing is characterized by comprising the following raw materials in percentage by mass: Co:22%-28%,Cr:19%-25%,Fe:21%-27%,Ni:22%-28%,Y 2 O 3 :0.1%-0.5%。
  2. 2. The 3D printing-based ODS-CoCrFeNi high-entropy alloy according to claim 1, wherein the ODS-CoCrFeNi high-entropy alloy comprises 23% -26% of Co, 20% -23% of Cr, 21% -24% of Fe, 24% -27% of Ni and 0.1% -0.3% of Y 2 O 3 .
  3. 3. A method for preparing an ODS-CoCrFeNi high-entropy alloy based on 3D printing according to any one of claims 1 to 2, comprising the steps of: Preparing high-entropy alloy powder; Mixing the high-entropy alloy powder with nanometer yttrium oxide, and drying after mixing; And 3D printing is carried out on the dried mixed powder, so that the high-entropy alloy is obtained.
  4. 4. A method for preparing an ODS-CoCrFeNi high-entropy alloy based on 3D printing according to claim 3, wherein the preparing the high-entropy alloy powder includes: Proportioning according to the mass percentage, and smelting the raw materials into alloy liquid; And atomizing the alloy liquid, and solidifying to obtain the high-entropy alloy powder.
  5. 5. The method for preparing the ODS-CoCrFeNi high-entropy alloy based on 3D printing according to claim 3, wherein mixing the high-entropy alloy powder with nano yttrium oxide comprises screening the high-entropy alloy powder before mixing the high-entropy alloy powder with nano yttrium oxide, wherein the screened grain size is 15-53 μm.
  6. 6. The method for preparing ODS-CoCrFeNi high-entropy alloy based on 3D printing according to claim 3, wherein the drying treatment comprises the steps of vacuum degree of 280Pa-320Pa, drying temperature of 100 ℃ to 140 ℃ and drying time of 1.5h-2.5h.
  7. 7. The method for preparing the ODS-CoCrFeNi high-entropy alloy based on 3D printing according to claim 3, wherein the step of 3D printing the dried mixed powder comprises the steps of placing the dried mixed powder in a 3D printer, setting the process parameters of the 3D printer, and finishing printing.
  8. 8. The method for preparing the ODS-CoCrFeNi high-entropy alloy based on 3D printing according to claim 7, wherein the step of placing the dried mixed powder in a 3D printer comprises the steps of mounting a substrate on the 3D printer and performing high calibration.
  9. 9. The method for preparing the ODS-CoCrFeNi high-entropy alloy based on 3D printing according to claim 7, wherein the technological parameters include 3D printer power, laser spot diameter, scanning speed, scanning interval, powder spreading layer thickness, scanning path and interlayer rotation angle.
  10. 10. The method for preparing ODS-CoCrFeNi high-entropy alloy based on 3D printing according to claim 9, wherein the technological parameters are determined according to average temperature and temperature fluctuation range of molten pool.

Description

ODS-CoCrFeNi high-entropy alloy based on 3D printing and preparation method thereof Technical Field The invention relates to the technical field of high-entropy alloy preparation, in particular to an ODS-CoCrFeNi high-entropy alloy based on 3D printing and a preparation method thereof. Background Along with the continuous innovation and development of hydrogen fuel cell automobiles, key parts of the vehicle-mounted hydrogen storage system are required to adapt to more severe environments with various working conditions such as high temperature, high pressure, corrosiveness and the like. However, the existing parts have low material strength, and the hydrogen embrittlement sensitivity is increased along with the increase of the pressure of the hydrogen environment in service, so that the safety use requirement of the future hydrogen storage container cannot be met. Therefore, the development of the core pressure-bearing member material meeting the future service conditions is needed to be solved. The high-entropy alloy is reported as a novel alloy for the first time in 2004, and is composed of five or more main elements in equimolar or nearly equimolar ratio, and endows four core effects due to unique components and structures. Meanwhile, the high-entropy alloy also has excellent properties which are incomparable with those of the traditional alloy, such as high strength and toughness, high hardness, high wear resistance, high thermal resistance, high resistivity, high-temperature oxidation resistance and the like. Therefore, the high-entropy alloy can widen the service range of the material and is widely studied. CoCrFeNi high-entropy alloy (High Entropy Alloy, HEA) has excellent plasticity because of low stacking fault energy (31.7 mJ/m 2) and can promote generation of nano twin crystals during plastic deformation. It is reported that the high-entropy alloy and the traditional alloy have low plastic loss and higher hydrogen embrittlement resistance compared with the plastic and tensile strength of the multi-principal alloy under the same hydrogen charging condition. However, coCrFeNi high-entropy alloy with face-centered cubic structure has lower strength, and oxide dispersion strengthening (Oxide Dispersion Strengthened, ODS) can be used as strengthening means to improve the strength of the material. Meanwhile, through in-situ precipitation of the second phase, the inward diffusion and migration of hydrogen can be slowed down by a trapping effect, and the tendency of hydrogen to induce inter-crystal cracking is reduced, so that the hydrogen embrittlement resistance of the alloy is improved. The conventional preparation of ODS-alloys by mechanical alloying in combination with thermal solidification requires a long time and the formed samples require subsequent processes such as rolling, heat treatment, welding, etc. The complex preparation process not only affects the production efficiency of the material, but also greatly increases the preparation cost of the material. The laser powder bed melting technology can directly deposit alloy powder layer by layer into parts with complex shapes, and has the advantages of higher material utilization rate, shorter preparation period, lower preparation cost, larger preparation flexibility and the like. There is currently little research on 3D printing to produce ODS-high entropy alloys. Disclosure of Invention The invention aims to provide a 3D printing-based ODS-CoCrFeNi high-entropy alloy and a preparation method thereof, which are used for solving the technical problems that the strength of a part material of a vehicle-mounted hydrogen storage system in the prior art is low, the hydrogen embrittlement sensitivity is increased along with the increase of the pressure of the hydrogen environment in service, and the safety use requirement of a future hydrogen storage container cannot be met. In order to achieve the above purpose, in one embodiment of the invention, an ODS-CoCrFeNi high-entropy alloy based on 3D printing is provided, which comprises the following raw materials in percentage by mass: Co:22%-28%,Cr:19%-25%,Fe:21%-27%,Ni:22%-28%,Y2O3:0.1%-0.5%。 According to one preferred scheme of the invention, the ODS-CoCrFeNi high-entropy alloy comprises, by mass, 23% -26% of Co, 20% -23% of Cr, 21% -24% of Fe, 24% -27% of Ni and 0.1% -0.3% of Y 2O3. Based on the 3D printing-based ODS-CoCrFeNi high-entropy alloy, the invention also discloses a preparation method of the 3D printing-based ODS-CoCrFeNi high-entropy alloy, which comprises the following steps: Preparing high-entropy alloy powder; Mixing high-entropy alloy powder with nanometer yttrium oxide, and drying after mixing; And 3D printing is carried out on the dried mixed powder, so that the high-entropy alloy is obtained. In one of the preferred embodiments of the present invention, a high entropy alloy powder is prepared comprising: Proportioning according to the mass percentage, and smelting the raw materials