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Precipitation strengthening type medium-entropy alloy suitable for laser additive manufacturing and preparation method of precipitation strengthening type medium-entropy alloy

A precipitation strengthening and laser additive technology, applied in additive manufacturing, additive processing, etc., can solve the problems of cracking, high thermal residual stress, liquefaction cracking strain aging, etc., and achieve the effect of excellent comprehensive mechanical properties and excellent strengthening effect.

Active Publication Date: 2022-04-29
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the high temperature gradient and large cooling rate in the additive manufacturing process usually lead to high thermal residual stress, which is prone to metallurgical defects such as cracks
Especially for precipitation-strengthened high / medium entropy alloys, defects such as liquefaction cracking and strain aging cracking are prone to occur during the printing process, which affects the structural integrity and comprehensive performance of components

Method used

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  • Precipitation strengthening type medium-entropy alloy suitable for laser additive manufacturing and preparation method of precipitation strengthening type medium-entropy alloy
  • Precipitation strengthening type medium-entropy alloy suitable for laser additive manufacturing and preparation method of precipitation strengthening type medium-entropy alloy
  • Precipitation strengthening type medium-entropy alloy suitable for laser additive manufacturing and preparation method of precipitation strengthening type medium-entropy alloy

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preparation example Construction

[0045] The present invention provides a preparation method of the above-mentioned precipitation-enhanced medium-entropy alloy by laser selective melting and forming technology, comprising the following steps:

[0046] 1. Preparation and pretreatment of medium entropy alloy powder

[0047] Proportioning is carried out according to the mole percentage of each element in the nominal chemical composition of the medium-entropy alloy, and the pre-alloyed spherical powder of the medium-entropy alloy is prepared by the vacuum atomization method, and the pre-alloyed spherical powder is sieved, and the particle size of the selected powder is 15- 53 μm. The oxygen content and nitrogen content are less than 300ppm, the preferred oxygen content is 131ppm, and the nitrogen content is 53ppm. Before laser selective melting, the pre-alloyed spherical powder is dried at 80°C for 4 hours to remove the moisture in the powder, and then placed in the powder feeding cylinder of the laser selective ...

Embodiment 1

[0062] A precipitation-enhanced medium-entropy alloy suitable for laser additive manufacturing, the chemical formula of which is Ni 35 co 35 Cr 25 Ti 3 Al 2 ; Wherein, the ratio of each element is mole percent. The selected medium entropy alloy is a gas-atomized pre-alloyed spherical powder with a purity greater than 99.9%.

[0063] In Example 1, the forming process of the medium entropy alloy prepared by laser selective melting technology is as follows:

[0064] 1. Preparation and pretreatment of medium entropy alloy powder

[0065] According to the molar ratio of each element in the nominal chemical composition of the above-mentioned medium-entropy alloy, the medium-entropy alloy pre-alloyed spherical powder is prepared by vacuum atomization method, and the pre-alloyed powder is sieved, and the particle size of the selected powder is 15- 53μm, its typical shape is as figure 1 shown. The oxygen content was 131 ppm and the nitrogen content was 53 ppm. Before laser selec...

Embodiment 2

[0082] A precipitation-enhanced medium-entropy alloy suitable for laser additive manufacturing, the chemical formula of which is Ni 35 co 35 Cr 25 Ti 3 Al 2 ; Wherein, the ratio of each element is mole percent. The selected medium entropy alloy is a gas-atomized pre-alloyed spherical powder with a purity greater than 99.9%.

[0083] Present embodiment 2 adopts laser three-dimensional forming technology to prepare medium entropy alloy forming process as follows:

[0084] 1. Preparation and pretreatment of medium entropy alloy powder

[0085] According to the molar ratio of each element in the nominal chemical composition of the medium-entropy alloy, the medium-entropy alloy pre-alloyed spherical powder is prepared by vacuum atomization method, and the pre-alloyed spherical powder is sieved, and the particle size of the powder is 45 -150μm, its typical shape is as Figure 8 shown. The oxygen content was 131 ppm and the nitrogen content was 53 ppm. Before the laser three...

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Abstract

The invention provides a precipitation strengthening type medium-entropy alloy suitable for laser additive manufacturing and a preparation method thereof, the precipitation strengthening type medium-entropy alloy is NiaCobCrcAldMe, M is one or more elements of Ti, Ta, Nb and Mo, a, b, c, d and e respectively represent the molar percentage corresponding to each element, b is 20%-40%, c is 20%-25%, and dgt is 1%-2%; 1%, egt; 0, d + ilt; a + b + c + d + e = 100%. The precipitation strengthening type medium-entropy alloy is prepared through the selective laser melting forming technology or the laser three-dimensional forming technology, and preparation of the novel precipitation strengthening type medium-entropy alloy which is high in compactness, free of cracks and excellent in comprehensive mechanical property is achieved.

Description

technical field [0001] The invention relates to the technical field of laser additive manufacturing of metal materials, in particular to a precipitation-enhanced medium-entropy alloy suitable for laser additive manufacturing and a preparation method thereof. Background technique [0002] High / medium-entropy alloys use a new alloy design strategy, using several iso-concentration or near-iso-concentration main elements as alloying elements, exhibiting an excellent combination of strength, ductility and fracture toughness, with a wide range of structuring and functionalization Application prospect. High / medium entropy alloys with FCC structure exhibit good toughness, but their strength is generally low, which is difficult to meet the application requirements of structural materials. Effective method of toughening. [0003] The traditional preparation method of high / medium-entropy alloys is mainly based on arc melting, which has defects such as single shape and size, prone to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/04B22F10/28B22F10/64B22F9/08B33Y10/00B33Y40/20
CPCC22C30/00C22C1/04B22F10/28B22F10/64B22F9/082B33Y10/00B33Y40/20B22F2009/0824Y02P10/25
Inventor 何峰郭博静谢浩宇王志军李俊杰王锦程
Owner NORTHWESTERN POLYTECHNICAL UNIV
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