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Preparation method of raw material powder for high-entropy alloy selective laser melting additive manufacturing

A technology of selective laser melting and high-entropy alloying, which is applied in the field of alloy materials, can solve the problems such as the inability to obtain defect-free printed parts from the elemental mixed powder, the difference of the melting point and boiling point of the elemental powder, and the imperfect powder production system, so as to achieve a good molding effect, The effect of good density and lower production and R&D costs

Active Publication Date: 2020-05-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current domestic additive manufacturing powder production system is not perfect, and the alloy powder materials used for high-entropy alloy additive manufacturing need to waste huge production capacity for customization, and the cost is extremely high
And the composition of the alloy powder is fixed, which is not conducive to the composition adjustment in the process of alloy development
Direct use of elemental powder for in-situ SLM manufacturing also faces the problem of large differences in the melting point and boiling point of each elemental powder. Therefore, during the printing process, the heat input is so low that the low melting point metal element cannot be melted when the high melting point metal element is melted. When the particles are melted, and the heat input is high to the high melting point element is completely melted, the low melting point metal element will evaporate due to overheating, and the gas cannot overflow the molten pool, resulting in pores
Therefore, it is impossible to obtain defect-free or less-defected prints by directly using the single-quality mixed powder

Method used

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  • Preparation method of raw material powder for high-entropy alloy selective laser melting additive manufacturing
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  • Preparation method of raw material powder for high-entropy alloy selective laser melting additive manufacturing

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Embodiment 1

[0039] A FeCoCrNi system high-entropy alloy selective laser melting in-situ additive manufacturing method, comprising the following steps:

[0040] Step 1, the raw materials are mixed, and the purity is 99.9% 560gFe, 590gCo elemental metal spherical powder (powder particle diameter 15~48 microns) and 1110gNi 50 Cr 50 Alloy spherical powder (powder particle size 15-48 microns) is placed in a three-dimensional mixer and mixed for 4 hours, the cylinder speed is 20r / min, and the uniformly mixed spherical powder is dried in a vacuum dryer for 10 hours at a temperature of 50 degrees Celsius , the vacuum degree is less than the absolute pressure of 10KPa, and it is sealed and stored after drying.

[0041] Step 2, additive preparation, the substrate is made of 316L stainless steel, the size is 250×250×15mm, the surface of the substrate is polished with an angle grinder until there is no oxide, and the oil and dirt on the surface are cleaned with acetone and alcohol respectively. Use...

Embodiment 2

[0053] A FeCoCrNi system high-entropy alloy selective laser melting in-situ additive manufacturing method, comprising the following steps:

[0054] Step 1, the raw materials are mixed, and the purity is 99.9% 560gFe, 590gCo, 442.5gNi elemental metal spherical powder (powder particle size 15-48 microns) and 667.5gNi 20 Cr 80 Alloy spherical powder (powder particle size 15-48 microns) is placed in a three-dimensional mixer and mixed for 2 hours, the cylinder speed is 40r / min, and the uniformly mixed spherical powder is dried in a vacuum dryer for 5 hours at a temperature of 100 degrees Celsius , the vacuum degree is less than the absolute pressure of 10KPa, and it is sealed and stored after drying.

[0055] Step 2, additive preparation, the substrate is made of 316L stainless steel, the size is 250×250×15mm, the surface of the substrate is polished with an angle grinder until there is no oxide, and the oil and dirt on the surface are cleaned with acetone and alcohol respectivel...

Embodiment 3

[0057] A FeCoCrNi system high-entropy alloy selective laser melting in-situ additive manufacturing method, comprising the following steps:

[0058] Step 1, the raw materials are mixed, and the purity is 99.9% 560gFe, 590gCo, 337.1gNi elemental metal spherical powder (powder particle size 15-48 microns) and 772.9gNi 30 Cr 70 Alloy spherical powder (powder particle size 15-48 microns) is placed in a three-dimensional mixer and mixed for 3 hours, the cylinder speed is 30r / min, and the uniformly mixed spherical powder is dried in a vacuum dryer for 8 hours at a temperature of 80 degrees Celsius , the vacuum degree is less than the absolute pressure of 10KPa, and it is sealed and stored after drying.

[0059] Step 2, additive preparation, the substrate is made of 316L stainless steel, the size is 250×250×15mm, the surface of the substrate is polished with an angle grinder until there is no oxide, and the oil and dirt on the surface are cleaned with acetone and alcohol respectively...

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Abstract

The invention provides a preparation method of raw material powder for high-entropy alloy selective laser melting additive manufacturing. According to the technical scheme, through a raw material mixing method, alloy powder or simple metal powder is matched with alloy powder to obtain high-entropy alloy powder, so that melting points of all the composition powder in the high-entropy alloy powder tend to be similar, and wherein the mole numbers of all metal elements in the high-entropy alloy powder are the same. The invention further discloses the application of the preparation method of the raw material powder for high-entropy alloy selective laser melting additive manufacturing in a high-entropy alloy selective laser melting in-situ additive manufacturing process, and an obtained high-entropy alloy product is good in forming effect and free of pores and macroscopic cracks.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and in particular relates to a method for preparing raw material powder for high-entropy alloy selective laser melting additive manufacturing. Background technique [0002] The concept of high-entropy alloys is a new alloy design concept proposed in recent years. Different from traditional alloys with a single principal element or two principal elements in the past, it is usually composed of 5 or more elements, and the content of each element is between 5% and 35%, and the most common is an equimolar ratio mixture high-entropy alloys. This type of alloy design substantially increases the entropy in the alloy system, hence the name high-entropy alloys. High-entropy alloys have a series of excellent properties, such as high hardness, high tensile strength, wear resistance and corrosion resistance, etc. [0003] Laser additive manufacturing technology has received more and more attention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/105B33Y10/00B33Y70/00C22C1/04C22C30/00
CPCB22F1/0003C22C30/00C22C1/04B33Y10/00B33Y70/00B22F10/00B22F10/36B22F10/366B22F10/34B22F10/28B22F10/322Y02P10/25
Inventor 徐连勇林丹阳荆洪阳韩永典吕小青赵雷
Owner TIANJIN UNIV
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