High-entropy alloy in-situ preparation method and product by laser additives

A high-entropy alloy and laser additive technology, applied in the field of alloy materials, can solve the problems of large high-entropy alloy system, increased cost, formation mechanism and strengthening mechanism, etc., and achieve high efficiency and reduce production costs.

Active Publication Date: 2018-12-07
TIANJIN UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

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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  • High-entropy alloy in-situ preparation method and product by laser additives
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  • High-entropy alloy in-situ preparation method and product by laser additives

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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 Fe, Co, Cr, Ni, Ti spherical powder in equal molar ratio Mixing, the mixed spherical powder was mixed in a three-dimensional mixer for 3 hours, the cylinder speed was 30 r / min, and the uniformly mixed spherical powder was dried in a vacuum dryer for 6 hours, the temperature was 80 degrees Celsius, and the vacuum degree was Relative pressure -0.95MPa, sealed and stored after drying;

[0033] Step 2, additive preparation, the substrate is made of 304 stainless steel, the size is 100 × 100 × 15 mm, the surface of the substrate is ground 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 was put into the printer silo, and the LMD-8060 printer of Nanjing Zhongke...

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 invention overcomes the defect of the prior art and provides a high-entropy alloy in-situ preparation method and product by laser additives, FeCoCrNiTi high-entropy alloy powder preparation and in-situ laser additive fabrication are realized, microphase composition of an original sample is changed, and the hardness of the original sample is successfully improved. The method comprises the stepsof raw material mixing, additive preparing and aging treating. Materials prepared adopting the method are high in shaping efficiency and can be used for preparing parts in complex shapes. By means ofthe high-entropy alloy in-situ preparation method and product by the laser additives, near-net shaping of the materials can be realized, and the production cost of the parts is greatly lowered; the sample shaping effect is good, no pore and macroscopic cracking exist, the sample has no micropore and microcrack and has good density and relatively uniform tissue, and three phase structures coexist;and after high-temperature aging treatment is performed, precipitates are all converted from net shapes to plate strip shapes, obviously, just because of this conversion, the hardness of the sample is improved after the high-temperature aging treatment is performed, and the hardness of the sample cooled by quenching is higher than that of the sample cooled along with a 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 product of laser additive manufacturing of high-entropy alloys. Background technique [0002] The concept of high-entropy alloys was first proposed by Ye Junwei, a Taiwanese scholar, in 1995. In the past, alloys were mainly composed of one or two major 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 rapidly improved. 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 an equimolar ratio. Such alloys are designed in such a way that the entropy value in the alloy system is suffic...

Claims

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Application Information

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Patent Type & Authority Applications(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
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