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CN-122013016-A - CoCrNi medium-entropy alloy-based composite material, additive manufacturing method and application thereof

CN122013016ACN 122013016 ACN122013016 ACN 122013016ACN-122013016-A

Abstract

The invention discloses a CoCrNi medium-entropy alloy-based composite material, an additive manufacturing method and application thereof, and belongs to the technical field of materials. The CoCrNi entropy alloy-based composite material is obtained by additive manufacturing of composite powder formed by CoCrNi entropy alloy powder and WC powder in a laser powder bed fusion forming mode, coCrNi entropy alloy-based composite material comprises a matrix with an FCC structure, WC particles and submicron carbide M 23 C 6 are distributed in the matrix, wherein the WC particles are in a partial fusion state, and an element transition layer is arranged between the WC particles and the matrix. The medium-entropy alloy-based composite material has the characteristics of high strength, high toughness, excellent wear resistance, low cost and the like, can effectively solve the problems of low strength and poor wear resistance of the medium-entropy alloy CoCrNi, and can be applied to aerospace lightweight bearing parts, high-performance wear-resistant parts, high-end tool dies and the like.

Inventors

  • LIU JIANYE
  • HUANG ZHENGHUA
  • NIU LIUHUI
  • DENG PU
  • QIN LIN
  • WANG YANHUI
  • HU FUCHAO

Assignees

  • 广东汉邦激光科技有限公司

Dates

Publication Date
20260512
Application Date
20260228

Claims (10)

  1. 1. The CoCrNi middle entropy alloy-based composite material is characterized in that the CoCrNi middle entropy alloy-based composite material is obtained by additive manufacturing of composite powder formed by the CoCrNi middle entropy alloy powder and the WC powder in a laser powder bed fusion forming mode; The CoCrNi entropy alloy-based composite material comprises a matrix with an FCC structure, wherein WC particles and submicron carbides M 23 C 6 are distributed in the matrix, the WC particles are in a partial melting state, and an element transition layer is arranged between the WC particles and the matrix.
  2. 2. The medium entropy alloy-based composite of claim CoCrNi, wherein the composite powder has at least one of the following characteristics: Characterized by 1, the mass ratio of the entropy alloy powder in CoCrNi to the WC powder is 93:7 to 99:1, preferably the mass ratio of the entropy alloy powder in CoCrNi to the WC powder is 95:5; The grain diameter of the entropy alloy powder in CoCrNi is 15-53 μm; Characterized in that the grain diameter of the WC powder is 15-53 mu m; characteristic 4. The sphericity of the WC powder is not less than 95%.
  3. 3. The CoCrNi medium entropy alloy-based composite of claim 1, wherein said element transition layer has a width of 5-10 μm.
  4. 4. The CoCrNi medium entropy alloy-based composite as claimed in claim 1, wherein the submicron carbide M 23 C 6 has a dimension of 100nm to 400nm.
  5. 5. The CoCrNi medium entropy alloy-based composite according to any one of claims 1 to 4, wherein the CoCrNi medium entropy alloy-based composite further has at least one of the following characteristics: the characteristic 5 is that the tensile strength of the CoCrNi medium entropy alloy base composite material is 880 MPa-1215 MPa; The characteristic 6 is that the yield strength of the CoCrNi medium entropy alloy base composite material is 537-897 MPa; the elongation after break of the CoCrNi entropy alloy-based composite material is 11.2% -53.5%; Characteristic 8, the impact toughness of the entropy alloy-based composite material in CoCrNi is 32.1J/cm 2 ~141.2J/cm 2 ; The characteristic 9 is that the hardness of the CoCrNi entropy alloy base composite material is 24.9 HRC-36.7 HRC; feature 10 the volume abrasion rate of the entropy alloy-based composite material in CoCrNi is 2.1 10 -4 mm 3 /(N m)~7.5 10 - 4 mm 3 /(N m)。
  6. 6. A method for manufacturing an additive of the CoCrNi entropy alloy-based composite material according to any one of claims 1 to 5, comprising the step of performing additive manufacturing on composite powder formed by the CoCrNi entropy alloy powder and the WC powder by a laser powder bed fusion forming mode.
  7. 7. The additive manufacturing method according to claim 6, wherein the composite powder is obtained by mechanically mixing the CoCrNi medium entropy alloy powder and the WC powder for 4 to 10 hours at 10 to 30 rpm; Preferably, the composite powder is dried and then subjected to laser powder bed fusion forming.
  8. 8. The additive manufacturing method according to claim 6, wherein the conditions for melt forming of the laser powder bed comprise 150-350W of laser power, 500-1500 mm/s of scanning speed, 0.06-0.12 mm of scanning interval, 0.03-0.08 mm of powder layer thickness, and scanning strategy of strip scanning or zone scanning and layer-by-layer rotation; Preferably, the energy density of the laser powder bed melt forming is 60J/mm 3 ~80J/mm 3 .
  9. 9. The additive manufacturing method according to any one of claims 6 to 8, characterized in that the material obtained by the additive manufacturing is subjected to heat treatment; preferably, the heat treatment comprises water quenching or oil quenching after annealing for 1-3 hours at 1000-1100 ℃; Preferably, the heat treatment comprises water quenching after annealing at 1100 ℃ for 2 hours.
  10. 10. Use of the entropy alloy-based composite according to any one of claims 1 to 5 in CoCrNi for the preparation of lightweight aerospace bearings, high performance wear parts and/or high end tool molds.

Description

CoCrNi medium-entropy alloy-based composite material, additive manufacturing method and application thereof Technical Field The invention relates to the technical field of materials, in particular to a CoCrNi medium-entropy alloy-based composite material, an additive manufacturing method and application thereof. Background Additive manufacturing, particularly Laser Powder Bed Fusion (LPBF) technology, provides a revolutionary approach to the manufacture of high performance metal parts with complex geometries. Among a plurality of advanced metal materials, coCrNi and other medium-entropy alloys have wide application prospects in the fields of aerospace, biomedical treatment, energy chemical industry and the like due to unique component design concepts. However, the entropy alloy in CoCrNi prepared by the conventional LPBF process still has some performance bottlenecks, for example, room temperature strength is still insufficient compared with that of partial conventional high-strength alloy, and application of the entropy alloy to extreme bearing parts is limited, for example, inherent hardness and wear resistance of the entropy alloy are poor, and service life of the entropy alloy is limited under working conditions involving friction and wear. In view of this, the present invention has been made. Disclosure of Invention The invention aims to provide a CoCrNi entropy alloy-based composite material, an additive manufacturing method and application thereof, so as to solve or improve the technical problems. The invention can be realized as follows: In a first aspect, the present invention provides a CoCrNi medium entropy alloy-based composite material, wherein the CoCrNi medium entropy alloy-based composite material is obtained by additive manufacturing of composite powder formed by CoCrNi medium entropy alloy powder and WC powder by a laser powder bed fusion forming method; CoCrNi the entropy alloy-based composite material comprises a matrix with an FCC structure, WC particles and submicron carbides M 23C6 are distributed in the matrix, wherein the WC particles are in a partial melting state, and an element transition layer is arranged between the WC particles and the matrix. In an alternative embodiment, the composite powder has at least one of the following features: characterized by a mass ratio of entropy alloy powder to WC powder of 93:7 to 99:1 in CoCrNi, preferably a mass ratio of entropy alloy powder to WC powder of 95:5 in CoCrNi; the characteristic 2 is that the grain diameter of the entropy alloy powder in CoCrNi is 15-53 mu m; the particle size of WC powder is 15-53 mu m; Feature 4 sphericity of wc powder is not less than 95%. In an alternative embodiment, the elemental transition layer has a width of 5 μm to 10 μm. In an alternative embodiment, the submicron carbide M 23C6 has a dimension of 100nm to 400nm. In an alternative embodiment, the CoCrNi entropy alloy-based composite also has at least one of the following features: the characteristic 5 is that the tensile strength of the entropy alloy-based composite material in CoCrNi is 880 MPa-1215 MPa; the characteristic is that the yield strength of the entropy alloy-based composite material in CoCrNi is 537MPa-897 MPa; The characteristic is that the elongation after break of the entropy alloy-based composite material in CoCrNi is 11.2% -53.5%; Characteristic 8. The impact toughness of the entropy alloy-based composite material in CoCrNi is 32.1J/cm 2~141.2J/cm2; the characteristic 9 is that the hardness of the entropy alloy-based composite material in CoCrNi is 24.9 HRC-36.7 HRC; Characteristic 10 CoCrNi in entropy alloy matrix composite with a bulk wear rate of 2.1 10-4mm3/(N·m)~7.510-4mm3/(N·m)。 In a second aspect, the present invention provides a method of additive manufacturing of the CoCrNi entropy alloy-based composite as in any one of the preceding embodiments, comprising the step of additively manufacturing a composite powder formed from the CoCrNi entropy alloy powder and the WC powder by laser powder bed melt forming. In an alternative embodiment, the composite powder is obtained by mechanically mixing CoCrNi medium entropy alloy powder and WC powder for 4-10 hours at 10-30 rpm. In an alternative embodiment, the composite powder is dried and then laser powder bed fusion formed. In an alternative embodiment, the conditions for fusion forming of the laser powder bed comprise 150-350W of laser power, 500-1500 mm/s of scanning speed, 0.06-0.12 mm of scanning interval, 0.03-0.08 mm of powder laying layer thickness, and the scanning strategy is strip scanning or zone scanning and layer-by-layer rotation. In an alternative embodiment, the laser powder bed is melt formed with an energy density of 60J/mm 3~80J/mm3. In an alternative embodiment, the laser powder bed melt forming is performed under a protective atmosphere. In an alternative embodiment, the material resulting from the additive manufacturing is heat treated. In an alternative embodim