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A kind of in-situ preparation method and product of laser additive manufacturing high entropy alloy

A high-entropy alloy and laser additive technology, applied in the field of alloy materials, can solve the problems of huge high-entropy alloy system, increased cost, formation mechanism and strengthening mechanism are not completely clear, etc., to achieve high efficiency and reduce production costs.

Active Publication Date: 2021-07-30
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high-entropy alloy system is huge, and its specific formation mechanism and strengthening mechanism have not been fully clarified, and research and exploration still need a considerable period of time.
The main way to prepare high-entropy alloy samples is vacuum arc melting, but this method can prepare samples with very simple geometry and cannot prepare samples with complex shapes.
In addition, because it contains more alloying elements, it will increase the cost if the traditional process is used for subtractive manufacturing

Method used

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  • A kind of in-situ preparation method and product of laser additive manufacturing high entropy alloy
  • A kind of in-situ preparation method and product of laser additive manufacturing high entropy alloy
  • A kind of in-situ preparation method and product of laser additive manufacturing high entropy alloy

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Effect test

Embodiment 1

[0032] Step 1, mixing raw materials, Fe, Co, Cr, Ni, Ti spherical powder with a purity of 99.9%, the particle size of the spherical powder is in the range of 50-150 μm, and the Fe, Co, Cr, Ni, Ti spherical powders in an equal molar ratio Mixing, mixing the mixed spherical powder in a three-dimensional mixer for 3 hours, the cylinder rotating speed is 30r / min, drying the uniformly mixed spherical powder in a vacuum dryer for 6 hours, the temperature is 80 degrees Celsius, and the vacuum degree is Relative pressure -0.95MPa, sealed after drying;

[0033] Step 2, additive preparation, the substrate is made of 304 stainless steel with a size of 100×100×15mm, 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, and the The spherical powder obtained after the completion of step 1 is put into the printer silo, and the LMD-8060 printer of Nanjing Zhongke Yuchen Com...

Embodiment 2

[0042] Step 1, mixing raw materials, Fe, Co, Cr, Ni, Ti spherical powder with a purity of 99.9%, the particle size of the spherical powder is in the range of 50-150 μm, and the Fe, Co, Cr, Ni, Ti spherical powders in an equal molar ratio Mixing, mixing the mixed spherical powder in a three-dimensional mixer for 3 hours, the cylinder rotating speed is 30r / min, drying the uniformly mixed spherical powder in a vacuum dryer for 6 hours, the temperature is 80 degrees Celsius, and the vacuum degree is Relative pressure -0.95MPa, sealed after drying;

[0043] Step 2, additive preparation, the substrate is made of 304 stainless steel with a size of 100×100×15mm, 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, and the The spherical powder obtained after the completion of step 1 is put into the printer silo, and the LMD-8060 printer of Nanjing Zhongke Yuchen Com...

Embodiment 3

[0046] Step 1, mixing raw materials, Fe, Co, Cr, Ni, Ti spherical powder with a purity of 99.9%, the particle size of the spherical powder is in the range of 50-150 μm, and the Fe, Co, Cr, Ni, Ti spherical powders in an equal molar ratio Mixing, mixing the mixed spherical powder in a three-dimensional mixer for 3 hours, the cylinder rotating speed is 30r / min, drying the uniformly mixed spherical powder in a vacuum dryer for 6 hours, the temperature is 80 degrees Celsius, and the vacuum degree is Relative pressure -0.95MPa, sealed after drying;

[0047] Step 2, additive preparation, the substrate is made of 304 stainless steel with a size of 100×100×15mm, 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, and the The spherical powder obtained after the completion of step 1 is put into the printer silo, and the LMD-8060 printer of Nanjing Zhongke Yuchen Com...

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Abstract

The present invention overcomes the deficiencies of the prior art, provides an in-situ preparation method and product for laser additive manufacturing of high-entropy alloys, realizes powder preparation of FeCoCrNiTi high-entropy alloys and in-situ laser additive manufacturing, and changes the original sample microscopic phase composition and successfully increased its hardness. The method of the present invention includes the steps of mixing raw materials, material additive preparation and aging treatment. The material prepared by the method has high molding efficiency and can be used to prepare parts with complex shapes. It can realize the near-net shape of the material and greatly reduce the production cost of parts. The molding effect of the sample is good, there are no pores and macro cracks, the sample has no micro pores and micro cracks, the density is good, and the structure is relatively uniform, and the three phase structures coexist. After high-temperature aging treatment, all the precipitates changed from net shape to lath shape. It can be seen that it is because of this transformation that the hardness of the sample after high temperature aging treatment is improved, and the hardness of the sample cooled by quenching is higher than that of the sample cooled by furnace. .

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and in particular relates to an in-situ preparation method and products for laser additive manufacturing of high-entropy alloys. Background technique [0002] The concept of high-entropy alloys was first proposed by Taiwan scholar Ye Junwei in 1995. Previous alloys were mainly composed of one or two main elements and some minor elements. However, after a long period of development, it has been unable to break through the bottleneck that the performance cannot be improved rapidly. The high-entropy alloy theoretical system is established on the basis of completely breaking through the traditional alloy design concept. It is usually composed of 5 or more elements, and the content of each element is between 5% and 35%. The most common It is a high-entropy alloy mixed in equimolar ratio. This type of alloy design substantially increases the entropy in the alloy system, hence the name high-e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04B22F3/105B22F3/24B22F1/00C23G5/024C22C30/00B33Y10/00B33Y50/02
CPCB22F1/0003B22F3/105B22F3/24B22F9/04B22F2003/248B22F2009/041B22F2998/10B22F2999/00B33Y10/00B33Y50/02C22C30/00C22C33/0285C22C38/02C22C38/50C22C38/52C23G5/024B22F2201/20
Inventor 徐连勇林丹阳荆洪阳韩永典吕小青赵雷
Owner TIANJIN UNIV