A nitrogen-containing high-entropy alloy composite material and its preparation method

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: 2022-03-04
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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  • A nitrogen-containing high-entropy alloy composite material and its preparation method
  • A nitrogen-containing high-entropy alloy composite material and its preparation method
  • A nitrogen-containing high-entropy alloy composite material and its preparation method

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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 alloy composite material has a mixed crystal structure in which one layer of coarse grains and one layer of fine grains are alternately distributed. The preparation method includes: step 1, preparing nitrogen-containing high-entropy pre-alloyed powder; in the nitrogen-containing high-entropy pre-alloyed powder, metal elements are selected from at least three of Fe, Co, Cr, Ni, and Mn; In step 2, the nitrogen-containing high-entropy pre-alloyed powder obtained in step 1 is formed by using a selective laser melting technology; and a nitrogen-containing high-entropy alloy is obtained. The preparation process of the present invention is simple and controllable; the structure of the product is fine and uniform, the nitrogen element distribution inside the blank is uniform, the overall nitrogen element distribution is also relatively uniform, the mechanical properties are good, and the corrosion resistance is good; this is to realize the nitrogen-containing high-entropy alloy. Engineering applications provide the necessary conditions.

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 Patents(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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