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Preparation method of carbon-containing high-entropy alloy composite material

A technology of high-entropy alloys and composite materials, which can be used in additive manufacturing, additive processing, and energy efficiency improvement. , The molding speed is fast, and the effect of no loss of plasticity

Active Publication Date: 2018-06-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of using hot isostatic pressing to improve sample performance increases industrial energy consumption, reduces product accuracy, and weakens the engineering significance of selective laser melting

Method used

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  • Preparation method of carbon-containing high-entropy alloy composite material
  • Preparation method of carbon-containing high-entropy alloy composite material
  • Preparation method of carbon-containing high-entropy alloy composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The invention provides a method for preparing a carbon-containing high-entropy alloy composite material, which includes the following steps:

[0041] (1) Select Fe, Co, Cr, Ni metal element and chromium carbide as raw materials, the atomic ratio of Fe, Cr, Ni, Co, C in the composite material is 1:1:1:1:1:0.05, adopting gas atomization method Preparation of high-entropy pre-alloyed powder; among them, the alloying element powder does not contain other impurities except a small amount of inevitable impurity oxygen element, and the raw materials do not contain other elements except Fe, Co, Cr, Ni, C; high-entropy pre-alloyed powder The particle size range of alloy powder is 15~55μm, and D50 is controlled at 45μm;

[0042] (2) Establish a three-dimensional model of the part on the computer, plan the scanning path of the component, and use a checkerboard type to scan layer by layer; when scanning layer by layer, the deflection angle is 65°;

[0043] (3) Molding using selective las...

Embodiment 2

[0051] The invention provides a method for preparing a carbon-containing high-entropy alloy composite material, which includes the following steps:

[0052] (1) Fe, Co, Cr, Ni and chromium carbide are selected as raw materials. The atomic ratio of Fe, Cr, Ni, Co, and C in the composite material is 1:1:1:1:1:0.1, and the gas atomization method is adopted. Preparation of high-entropy pre-alloyed powder; among them, the alloying element powder does not contain other impurities except a small amount of inevitable impurity oxygen element, and the raw materials do not contain other elements except Fe, Co, Cr, Ni, C; high-entropy pre-alloyed powder The particle size range of alloy powder is 15~45μm, and d50 is controlled at 40μm;

[0053] (2) Establish a three-dimensional model of the part on the computer, plan the scanning path of the component, and use a checkerboard pattern to scan layer by layer; when scanning layer by layer, the deflection angle is 70°;

[0054] (3) The selected area ...

Embodiment 3

[0061] The invention provides a method for preparing a carbon-containing high-entropy alloy composite material, which includes the following steps:

[0062] (1) Fe, Co, Cr, Ni, Mn and chromium carbide are selected as raw materials. The atomic ratio of Fe, Cr, Ni, Co, Mn and C in the composite material is 1:1:1:1:1:1:1:0.07 , Adopt gas atomization method to prepare high-entropy pre-alloyed powder; among them, the alloying element powder does not contain other impurities except a small amount of unavoidable impurity oxygen element, and the raw materials do not contain other than Fe, Co, Cr, Ni, Mn, C The other element composition of the high-entropy pre-alloyed powder powder has a particle size range of 15-45μm, of which d50 is controlled at 35μm;

[0063] (2) Establish a three-dimensional model of the part on the computer, plan the scanning path of the component, and use a checkerboard pattern to scan layer by layer; when scanning layer by layer, the deflection angle is 63°;

[0064]...

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Abstract

The invention discloses a preparation method of a carbon-containing high-entropy alloy composite material. The method comprises the steps of (1) preparing high-entropy pre-alloyed powder, wherein thehigh-entropy pre-alloyed powder comprises at least four of metal elements of Fe, Co, Cr, Ni and Ni, and a C element; and (2) performing selective laser melting molding on the high-entropy pre-alloyedpowder; and performing following thermal treatment on the molded part to obtain the carbon-containing high-entropy alloy. According to the method, high-entropy alloys with outstanding plasticity, suchas Fe, Co, Cr and Ni, are used for preparing a substrate, so that the high plasticity remains after the selective laser melting molding; and meanwhile, an interstitial element C is introduced and issubjected to solid solution reinforcing, so that the yield intensity and the ultimate strength of the substrate can be obviously improved; the supercooling degree in the selective laser melting process is high, the interstitial element C can be uniformly dissolved into the substrate in a solid solution manner, and coarse and big carbide are not segregated and separated out, so that the plasticityof the material is ensured; a high-density (more than 99%) product is prepared through the selective laser melting mode.

Description

Technical field [0001] The invention belongs to the field of alloys, and particularly relates to a method for preparing a carbon-containing high-entropy alloy composite material by adopting a laser selective melting technology. Background technique [0002] High-entropy alloys refer to alloys in which at least quaternary and above transition alloy elements are combined in equimolar or close to equimolar ratios. Although the composition of high-entropy alloys is more complex, it can form a single-phase supersaturated solid solution. High-entropy alloys have good mechanical properties, corrosion resistance and oxidation resistance. [0003] Adding interstitial carbon to high-entropy alloys is a good way to strengthen high-entropy alloys. At present, high-entropy alloys are mainly prepared by vacuum arc melting and other methods. However, the cooling rate of smelting itself is low, and the coarse hard carbides in the carbon-containing high-entropy alloy are easy to segregate at the...

Claims

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Application Information

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IPC IPC(8): B22F3/105C22C30/00B33Y10/00
CPCC22C30/00B33Y10/00B22F10/00B22F10/32B22F10/36B22F10/64B22F10/366B22F10/28Y02P10/25
Inventor 刘咏周睿刘彬
Owner CENT SOUTH UNIV
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