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Nitrogen-containing high-entropy alloy composite material and preparation method thereof

A high-entropy alloy and composite material technology, which is applied in the field of nitrogen-containing high-entropy alloy composite materials and its preparation, can solve the problem that the nitriding of the coating is difficult to uniformize the structure, so as to overcome the poor creep performance and fatigue resistance and improve the Yield strength and ultimate strength, and the effect of improving fatigue life

Active Publication Date: 2019-12-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, coating nitriding is difficult to obtain a uniform product

Method used

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  • Nitrogen-containing high-entropy alloy composite material and preparation method thereof
  • Nitrogen-containing high-entropy alloy composite material and preparation method thereof
  • Nitrogen-containing high-entropy alloy composite material and preparation method thereof

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Embodiment 1

[0045] The invention provides a method for preparing a nitrogen-containing high-entropy alloy composite material, comprising the following steps:

[0046] (1) Fe, Co, Cr, and Ni metal elements are selected as raw materials, and the atomic ratio of Fe, Cr, Ni, Co, and N in the composite material is 1:1:1:1:0.07, and the high-entropy material is prepared by gas atomization. Pre-alloyed powder, using nitrogen as the protective atmosphere; wherein, the alloying element powder does not contain other impurities except a small amount of unavoidable impurity oxygen, and the raw material does not contain other elements except Fe, Co, Cr, Ni, N; The particle size range of high-entropy pre-alloyed powder is 15-55 μm, and the D50 is controlled at 40 μm;

[0047] (2) Establish a three-dimensional model of the part on the computer, plan the scanning path of the component, and scan using a checkerboard pattern layer by layer; when scanning layer by layer, the deflection angle is 65°;

[004...

Embodiment 2

[0055] The invention provides a method for preparing a nitrogen-containing high-entropy alloy composite material, comprising the following steps:

[0056] (1) Fe, Co, Cr, and Ni metal elements are selected as raw materials, and the atomic ratio of Fe, Cr, Ni, Co, and N in the composite material is 1:1:1:1:0.08, and the high-entropy material is prepared by gas atomization. Pre-alloyed powder, using nitrogen as the protective atmosphere; wherein, the alloying element powder does not contain other impurities except a small amount of unavoidable impurity oxygen, and the raw material does not contain other elements except Fe, Co, Cr, Ni, N; The particle size range of high-entropy pre-alloyed powder is 15-45 μm, of which D50 is controlled at 40 μm;

[0057] (2) Establish a three-dimensional model of the part on the computer, plan the scanning path of the component, and scan using a checkerboard pattern layer by layer; when scanning layer by layer, the deflection angle is 70°;

[00...

Embodiment 3

[0064] The invention provides a method for preparing a nitrogen-containing high-entropy alloy composite material, comprising the following steps:

[0065] (1) Fe, Co, Cr, Ni, Mn metal elements are selected as raw materials, and the atomic ratio of Fe, Cr, Ni, Co, Mn, N in the composite material is 1:1:1:1:1:1:0.07. The high-entropy pre-alloyed powder is prepared by the atomization method, and nitrogen is used as the protective atmosphere; among them, the alloy element powder does not contain other impurities except a small amount of unavoidable impurity oxygen, and the raw material does not contain Fe, Co, Cr, Ni, Mn , Other elemental components other than N; the particle size range of high-entropy pre-alloyed powder is 15-45 μm, of which D50 is controlled at 40 μm;

[0066] (2) Establish a three-dimensional model of the part on the computer, plan the scanning path of the component, and scan using a checkerboard pattern layer by layer; when scanning layer by layer, the deflect...

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Abstract

The invention belongs to the field of alloys, in particular to a nitrogen-containing high-entropy alloy composite material and a preparation method thereof. The nitrogen-containing high-entropy alloycomposite material has mixed crystal tissues with coarse crystals and fine crystals alternately distributed. The preparation method comprises the following steps: I, preparing nitrogen-containing high-entropy pre-alloy powder, wherein metal elements in the nitrogen-containing high-entropy pre-alloy powder are selected from at least three of Fe, Co, Cr, Ni and Mn; and S2, shaping the nitrogen-containing high-entropy pre-alloy powder obtained in the S1 by means of the selective laser melting technique to obtain the high-entropy alloy. The preparation process is simple and controllable. The obtained product is fine and uniform in tissue, uniform in nitrogen distribution in a blank, also uniform in integral nitrogen distribution, good in mechanical property and good in corrosion resistance, thereby, providing necessary conditions for engineering applications of the nitrogen-containing high-entropy alloy.

Description

technical field [0001] The invention belongs to the field of alloys, in particular to a nitrogen-containing high-entropy alloy composite material and a preparation method thereof. Background technique [0002] High-entropy alloys refer to alloys in which at least quaternary and above transition alloy elements are combined in an equimolar or nearly equimolar ratio. Although the composition of high-entropy alloys is relatively complex, a single-phase supersaturated solid solution can be formed. High entropy alloys have good mechanical properties, corrosion resistance and oxidation resistance. [0003] Adding interstitial elements to high-entropy alloys is a good way to strengthen high-entropy alloys. At present, many works have demonstrated that the introduction of carbon into high-entropy alloys can significantly improve its mechanical properties. For example, to Fe 40.4 Ni 11.3 mn 34.8 Al 7.5 Cr 6 Adding carbon to FeCoCrNiMn can improve the tensile strength of the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F9/08B33Y10/00
CPCB22F9/082B33Y10/00B22F2999/00B22F10/00B22F10/36B22F10/64B22F10/28B22F10/366B22F10/32B22F2201/02Y02P10/25
Inventor 刘咏周睿刘彬
Owner CENT SOUTH UNIV
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