A method for preparing powder metallurgy tensile eutectic high-entropy alloys by 3D printing

A high-entropy alloy, 3D printing technology, applied in the directions of additive manufacturing, energy efficiency improvement, process efficiency improvement, etc., can solve the problems of increasing technical development difficulty, increasing technical difficulty, lack of reference blueprint, etc. Process optimization, superior performance, and the effect of increasing density

Active Publication Date: 2020-01-21
江西咏泰粉末冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the current preparation of eutectic high-entropy alloys all adopts melting and casting technology; so when the present invention decides to adopt the method of additive manufacturing, it lacks a reference blueprint, which also increases the technical difficulty of the present invention; at the same time, in order to ensure the obtained product In order for the eutectic high-entropy alloy and the eutectic high-entropy alloy designed and prepared to have excellent high-temperature mechanical properties, its composition and process must be matched and optimized; and in the prior art, Fe, Co, Cr , Ni, and Ta as components, the report of developing eutectic high-entropy alloys with excellent properties by means of additive manufacturing, which further increases the development difficulty of the technology of the present invention

Method used

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  • A method for preparing powder metallurgy tensile eutectic high-entropy alloys by 3D printing
  • A method for preparing powder metallurgy tensile eutectic high-entropy alloys by 3D printing
  • A method for preparing powder metallurgy tensile eutectic high-entropy alloys by 3D printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 (success)

[0034] Preparation of FeCoCrNiTa Eutectic High Entropy Alloy Powder Cr by Gas Atomization 20 Fe 28 co 22 Ni 17 Ta 13 (The ratio mentioned above is the molar ratio), and then further sieved, and the powder with a particle size within 5 to 50 microns is used for selective laser cladding, and the substrate preheating temperature is 80°C. The laser power used for printing is 200W, the laser printing speed is 1000m / s, and the atmosphere is argon. Then cool down with the furnace.

[0035] The printed samples were taken out in a muffle furnace for stress relief annealing, the heating rate was 40°C / min, the holding temperature was 300°C, and the holding time was 3 hours. Then cool in the oven. In order to further increase the density of the material, the sample was subjected to hot isostatic pressing treatment. As for the pressure at 900°C, the pressure was 20MPa, and the holding time was 1 hour.

Embodiment 2

[0036] Example 2 (success)

[0037] Preparation of FeCoCrNiTa Eutectic High Entropy Alloy Powder Cr by Gas Atomization 21 Fe 27 co 23 Ni 16 Ta 13 (The ratio mentioned above is the molar ratio), and then further sieved, and the powder with a particle size within 5 to 50 microns is used for selective laser cladding, and the substrate preheating temperature is 90°C. The laser power used for printing is 300W, the laser printing speed is 1200m / s, and the atmosphere is argon. Then cool down with the furnace.

[0038]After the printed samples were taken out, they were subjected to stress relief annealing in a muffle furnace. The heating rate was 40°C / min, the holding temperature was 300°C, and the holding time was 4 hours. Then cool in the oven. In order to further improve the density of the material, the sample was subjected to hot isostatic pressing treatment. As for 1000°C, the pressure was 30 MPa, and the holding time was 2 hours.

Embodiment 3

[0039] Example 3 (success)

[0040] Preparation of FeCoCrNiTa Eutectic High Entropy Alloy Powder Cr by Gas Atomization 21 Fe 27 co 23 Ni 16 Ta 13 (The ratio mentioned above is the molar ratio), and then further sieved, and the powder with a particle size within 5 to 50 microns is used for selective laser cladding, and the substrate preheating temperature is 100°C. The laser power used for printing is 400W, the laser printing speed is 1400m / s, and the atmosphere is argon. Then cool down with the furnace.

[0041] The printed samples were taken out and placed in a muffle furnace for stress relief annealing at a heating rate of 40°C / min, a holding temperature of 400°C, and a holding time of 5 hours. Then cool in the oven. In order to further improve the density of the material, the sample was subjected to hot isostatic pressing treatment. As for the pressure at 1100°C, the pressure was 40 MPa, and the holding time was 3 hours.

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Abstract

The invention relates to a method for preparing a powder metallurgy eutectic high-entropy alloy by 3D printing; it belongs to the technical field of eutectic high-entropy alloy preparation. The eutectic high-entropy alloy is composed of Fe, Co, Cr, Ni, Ta in molar ratio, Cr:Fe:Co:Ni:Ta=x:(48-x):y:(39-y):z; Wherein, the value range of x is 19-24; the value range of y is 22-26; the value range of z is 10-15, and the sum of the molar ratio of each element is 100. The preparation method includes the following steps: under a protective atmosphere, using FeCoCrNiTa eutectic high-entropy alloy powder as a raw material; using 3D printing to prepare a blank sample; performing stress-relief annealing on the obtained blank sample; obtaining an annealed sample blank; The obtained annealed sample blank is subjected to hot isostatic pressing treatment; a finished product is obtained. The composition design of the invention is reasonable, the obtained product has excellent performance, and is convenient for large-scale application.

Description

technical field [0001] The invention relates to a method for preparing a powder metallurgy eutectic high-entropy alloy by 3D printing; it belongs to the technical field of eutectic high-entropy alloy preparation. Background technique [0002] Selective laser cladding (AM) has many advantages such as: 1. It can reduce the defects in the material structure; 2. Since there is no loss caused by processing in the traditional smelting process, it can reduce the loss of raw materials and reduce costs; 3. Multiple size samples can be laser printed at one time. With the rapid development of selective laser cladding technology in recent years, it has attracted great interest. And additive manufacturing technology has been widely used in high-entropy alloys (HEAs). Many studies have shown that choosing laser cladding technology can melt powder through high energy beam and obtain optimized structure and mechanical properties. [0003] With the successful application of the idea of ​​...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105B22F3/15B22F3/24C22C1/04C22C30/00B33Y80/00B33Y10/00
CPCC22C1/04C22C30/00B22F3/15B22F3/24B33Y10/00B33Y80/00B22F2003/248B22F10/00B22F10/64B22F10/36B22F10/32B22F10/28Y02P10/25
Inventor 刘咏韩六六刘彬
Owner 江西咏泰粉末冶金有限公司
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