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A kind of selective laser melting particle reinforced high entropy alloy material and preparation method thereof

A technology of selective laser melting and high-entropy alloys, applied in chemical instruments and methods, additive processing, additive manufacturing, etc., can solve the problems of reducing powder screening efficiency, delay grain growth, promote transformation, and nucleation rate-boosting effect

Active Publication Date: 2022-07-01
安徽中科春谷激光产业技术研究院有限公司
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Problems solved by technology

[0005] Vacuum induction melting gas atomization method prepares high-entropy alloy powder, and then sieves the high-entropy alloy powder. As the screening time increases, more and more unqualified high-entropy alloy powders accumulate on the surface of the screen, which reduces the screening efficiency of the powders

Method used

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  • A kind of selective laser melting particle reinforced high entropy alloy material and preparation method thereof
  • A kind of selective laser melting particle reinforced high entropy alloy material and preparation method thereof
  • A kind of selective laser melting particle reinforced high entropy alloy material and preparation method thereof

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preparation example Construction

[0038] A method for preparing a particle-enhanced high-entropy alloy material by selective laser melting, comprising the following steps:

[0039] Step 1: prepare high-entropy alloy powder by vacuum induction melting gas atomization method, and then sieve the powder through a screening device;

[0040] In the step 1, the vacuum induction smelting gas atomization method for preparing high-entropy alloy powder is to first use vacuum induction smelting and vacuum consumable remelting to prepare the high-entropy alloy master alloy, and then put the prepared master alloy into the melting crucible. The melting chamber is evacuated. When the pressure drops below 0.1Pa, more than 99.99% high-purity argon is charged until the pressure of the melting chamber returns to the standard atmospheric pressure. After complete melting, pour the molten metal into the tundish and conduct supersonic gas atomization to make powder; the atomization medium is high-purity argon gas of more than 99.99%,...

Embodiment 1

[0055] The atomic ratio of each element in the high-entropy alloy is Fe:Co:Cr:Ni:Ti:Al=25-2x:25-2x:25-2x:25-2x:3x:5x, where x=1, namely (FeCoNiCr) 92 Ti 3 Al 5

[0056] The melting temperature is 1700℃, and the atomization pressure is 6MPa;

[0057] Al 2 O 3 Hard particles, the average particle size is 1um, and its mass ratio accounts for 3% of the entire mixed powder;

[0058] The speed of the main disc of the ball mill is 200r / min, the rotation direction of the star disc is opposite to that of the main disc, the speed is 100r / min, and the ball milling time is 2h;

[0059] Before forming, the mixed powder is preheated in a vacuum drying oven, and then formed using NCL-M2150T selective laser melting SLM equipment. Ar gas is used in the forming chamber to protect the oxygen content at 2500ppm, the substrate temperature is 100℃, the spot diameter is 80um, and the powder layer is thick. 40um, laser power 240W, scanning speed 1000mm / s 2 O 3 Particle Reinforcement (FeCoNiCr...

Embodiment 2

[0062] The atomic ratio of each element in the high-entropy alloy is Fe:Co:Cr:Ni:Ti:Al=25-2x:25-2x:25-2x:25-2x:3x:5x, where x=0.75, namely (FeCoNiCr) 94 Ti 2.25 Al 3.75

[0063] The melting temperature is 1680℃, and the atomization pressure is 6MPa;

[0064] Al 2 O 3 Hard particles, the average particle size is 1um, and its mass ratio accounts for 2% of the entire mixed powder;

[0065] The speed of the main disc of the ball mill is 200r / min, the rotation direction of the star disc is opposite to that of the main disc, the speed is 100r / min, and the ball milling time is 1.5h;

[0066] Before forming, the mixed powder is preheated in a vacuum drying oven, and then formed using NCL-M2150T selective laser melting SLM equipment. Ar gas is used in the forming chamber to protect the oxygen content at 2500ppm, the substrate temperature is 100℃, the spot diameter is 80um, and the powder layer is thick. 40um, laser power 230W, scanning speed 1000mm / s 2 O 3 Particle Reinforcemen...

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Abstract

The invention relates to the technical field of alloy materials, in particular to a selective laser melting particle-enhanced high-entropy alloy material and a preparation method thereof. Perform powder screening; Step 2: Use the mechanical alloying method to obtain a uniform mixed powder from the high-entropy alloy powder and particle-enhanced powder obtained in Step 1; Step 3: Prepare the mixed powder obtained in Step 2 by selective laser melting (SLM) technology Sample; Step 4: Perform solid solution strengthening and aging treatment on the SLM sample obtained in Step 3. The invention realizes the composition design of the high-entropy alloy by adding an appropriate amount of Ti and Al to the FeCoNiCr high-entropy alloy, and adds Al in the high-entropy alloy. 2 O 3 The strengthening phase and the heat treatment of the sample by selective laser melting can significantly improve the properties of FeCoNiCr high-entropy alloys through strengthening, which is beneficial to prolong the working life of the formed parts and widen the range of working conditions.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a particle-enhanced high-entropy alloy material by selective laser melting and a preparation method thereof. Background technique [0002] High-entropy alloy is an emerging alloy system. Its appearance breaks the traditional alloy design concept. It usually contains a variety of main elements, and several element atoms or a mixture of main elements with nearly equal atomic ratios, reflecting a variety of elements. collective effect. Due to the high mixing entropy effect, its components tend to be arranged in disorder, thus forming a simple phase. High-entropy alloys exhibit a series of properties, including enlarged lattice domains, slow diffusion, and high phase stability. These structural characteristics make high-entropy alloys have unique mechanical properties and great application potential. [0003] FeCoNiCr is a kind of commonly used high-entropy alloys, but its...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00B22F10/28B22F10/64B22F9/08B07B1/42B07B1/46B33Y10/00B33Y40/20B33Y70/10
CPCC22C30/00B22F10/28B22F10/64B22F9/082B07B1/42B07B1/46B33Y10/00B33Y40/20B33Y70/10B22F2009/0824B22F2009/0848B22F2009/0896Y02P10/25
Inventor 王东生高雪松李荣彭丰肖猛
Owner 安徽中科春谷激光产业技术研究院有限公司
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