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A kind of high-entropy alloy powder and its preparation method and application in 3D printing

A high-entropy alloy and 3D printing technology, applied in the direction of additive processing, etc., can solve the problem that the hardness, toughness and corrosion resistance of high-entropy alloys are reduced, it is difficult to take advantage of the mechanical properties of high-entropy alloys, and the components of high-entropy alloys are difficult to mix uniformly. and other problems, to achieve the effect of good fluidity, small thermal stress and excellent performance

Active Publication Date: 2020-11-03
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) It is difficult to mix the components of high-entropy alloys prepared by traditional methods, and it is easy to produce defects such as segregation, which leads to the reduction of some properties of high-entropy alloys (including hardness, toughness, corrosion resistance, etc.)
[0004] (2) The grain size of high-entropy alloys prepared by traditional methods is relatively coarse, generally higher than 50 μm, and it is difficult to take advantage of the mechanical properties of high-entropy alloys
[0005] (3) The traditional method of manufacturing high-entropy alloy parts is generally direct casting or melting casting combined with mechanical processing, which cannot manufacture complex-shaped alloy parts, and at the same time, there is a lot of material waste and serious environmental pollution.
The smelting process of powder making is still easy to cause component segregation, resulting in uneven powder composition

Method used

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  • A kind of high-entropy alloy powder and its preparation method and application in 3D printing
  • A kind of high-entropy alloy powder and its preparation method and application in 3D printing
  • A kind of high-entropy alloy powder and its preparation method and application in 3D printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] First, take Co, Cr, Fe, Mn, Nb, Mo metal powders with a particle size of 200 μm, and the composition is Fe: 40%; Mn: 40%; Cr: 8%; Co: 8%; Nb: 2%; Mo: 2%, each element was weighed with an electronic scale.

[0050] The above powder was mixed with a small amount of ethanol and poured into a ball milling jar, and the ball milling jar was evacuated, then filled with protective gas argon, and ball milled at a ball milling speed of 350 / min and a ball milling time of 9 hours to obtain alloy mixed powder. The alloy powder obtained above was put into a vacuum drying oven to dry for 8 hours at a drying temperature of 80°C. Pour the dry powder obtained in the above steps into a mold, and press it into a round bar sample with a press under the action of a pressure of 80 MPa.

[0051] Set the temperature curve of mixed microwave heating (including heating speed and holding time). The heating rate is 100°C / min, the holding time is 15min, the heating temperature is 1100°C, the micro...

Embodiment 2

[0056] Firstly, take Fe, Mn, Co, Cr, Nb, Mo metal powders with a particle size of 100 μm, and the composition is Fe: 30%; Mn: 30%; Cr: 15%; Co: 15%; Nb: 5%; Mo: 5%, each element was weighed with an electronic scale.

[0057] The above powder is mixed with a small amount of ethanol and poured into a ball milling jar, and the ball milling jar is evacuated, and then filled with protective gas argon, and ball milled at a ball milling speed of 320 / min and a ball milling time of 8 hours to obtain an alloy mixed powder. The alloy powder obtained above was put into a vacuum drying oven to dry for 8 hours at a drying temperature of 80°C. Pour the dry powder obtained in the above steps into a mold, and press it into a round bar sample with a press under the action of a pressure of 100 MPa.

[0058] Set the temperature curve of mixed microwave heating (including heating speed and holding time). The heating rate is 100°C / min, the heating temperature is 1250°C, the holding time is 5min, ...

Embodiment 3

[0062] First, Fe, Mn, Co, Cr, Nb, and Mo metal powders with a particle size of 150 μm are taken respectively, and the composition is Fe: 35%; Mn: 25%; Cr: 20%; Co: 15%; Nb: 8%; Mo: 7%, each element was weighed with an electronic scale.

[0063] The above powder is mixed with a small amount of ethanol and poured into a ball mill jar, and the ball mill jar is evacuated, and then filled with protective gas argon, and ball milled at a ball milling speed of 300 / min and a ball milling time of 8 hours to obtain an alloy mixed powder. The alloy powder obtained above was put into a vacuum drying oven to dry for 8 hours at a drying temperature of 80°C. Pour the dry powder obtained in the above steps into a mold, and press it into a round bar sample with a press under the action of a pressure of 90 MPa.

[0064] Set the temperature curve of mixed microwave heating (including heating speed and holding time). The heating rate is 100°C / min, the heating temperature is 1200°C, the holding t...

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Abstract

The invention discloses a high entropy alloy powder and a making method thereof and application thereof in 3D printing. The high entropy alloy powder includes, in mole ratio, 20-45% of Fe, 20-45% of Mn, 2-15% of Cr, 2-15% of Co, 2-10% of Nb and 2-10% of Mo. According to the composition design of high entropy alloy, the surface of a part obtained by laser 3D printing is flat and the size precisionis high, and the printed part is free of intercrystalline cracks, hot cracks and cold cracks. According to the invention, a microwave technology is adopted for preparing an atomized ingot blank, so that the composition of the high entropy alloy ingot blank is extremely uniform without segregation. An induction melting crucible-free gas atomization technology is adopted to enable a high entropy alloy melt to be uniform and less in segregation; and in addition, the pollution caused by a crucible is also avoided. The high entropy alloy powder is good in flowability and high in apparent density, and 3D printing parts are high in density and high in mechanical performance.

Description

technical field [0001] The invention relates to the field of special materials for 3D printing, in particular to a high-entropy alloy powder, its preparation method and its application in 3D printing. Background technique [0002] So far, the synthesis of high-entropy alloys mainly adopts some traditional methods, such as melting and casting, casting and plastic processing, powder metallurgy, electrochemical deposition, magnetron sputtering and other methods. The high-entropy alloys prepared by these methods have the following problems: [0003] (1) The components of high-entropy alloys prepared by traditional methods are difficult to mix evenly, and defects such as segregation are prone to occur, which leads to the reduction of some properties of high-entropy alloys (including hardness, toughness, corrosion resistance, etc.). [0004] (2) The grain size of high-entropy alloys prepared by traditional methods is relatively coarse, generally higher than 50 μm, and it is diffi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00C22C30/00C22C1/04B22F9/08B33Y70/00
CPCB22F1/0003B22F9/082B33Y70/00C22C1/04C22C30/00
Inventor 袁铁锤李瑞迪牛朋达
Owner CENT SOUTH UNIV
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