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Double-phase high-entropy high-temperature alloy and additive manufacturing method thereof

A high-temperature alloy and additive manufacturing technology, applied in additive manufacturing, additive processing, etc., can solve the problem of less exploration of high temperature resistance, and achieve the effect of narrow crystallization temperature range, low density, and good additive manufacturing formability

Inactive Publication Date: 2021-08-06
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing design of eutectic high-entropy alloys is mainly based on the mechanical properties at room temperature, and there is little research on high-temperature resistance.

Method used

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  • Double-phase high-entropy high-temperature alloy and additive manufacturing method thereof
  • Double-phase high-entropy high-temperature alloy and additive manufacturing method thereof
  • Double-phase high-entropy high-temperature alloy and additive manufacturing method thereof

Examples

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preparation example Construction

[0027] A multi-principal alloy suitable for additive manufacturing and a preparation method thereof, the alloy is composed of main elements Ni, Co, Fe, Cr, Al, wherein trace elements include the following components: Nb, Mo, W, Ti, Ta, Zr , Hf, Y, Re, Ru, B, C. The main component of the multi-principal alloy is Ni a co b Fe c Cr d Al e x f, where a, b, c, d, e, f represent the mole percentages of the corresponding elements. The composition of the alloy constitutes the mole percentage content of the mixed components should meet the following requirements: Ni: 20-70%, Co: 20-70%, Cr: 0-25%, Fe: 0-25%, Al: 14-20 %, Nb: 0-2%, Mo: 0-2%, W: 0-3%, Ti: 0-3%, Ta: 0-2%, Hf: 0-1%, Y: 0-0.5% , Re: 0-1%, Ru: 0-1%, B: 0-0.2%, Zr: 0-0.1%, C: 0-0.2%.

[0028] In the preparation method of the alloy, the parameter ranges of the laser three-dimensional forming equipment are as follows: laser power 1200-1800W, scanning speed 1-10mm / s, spot diameter 1.5-3mm, overlapping rate 40-60%, powder...

Embodiment 1

[0030] A multi-principal alloy suitable for additive manufacturing, the chemical formula of the multi-principal alloy is Ni 32 co 30 Cr 10 Fe 10 Al 18 , wherein, the ratio of each element is mole percent, and its preparation method comprises the following steps:

[0031] S1. Powder mixing: select CoCrFeNi high-entropy alloy powder and Ni, Co, Al pure metal powder, and weigh according to the determined alloy composition ratio. Then pour the metal powder into the ball mill tank, add corundum pellets and appropriate amount of alcohol for wet mixing, and use a planetary ball mill to mix the powder to obtain a mixed alloy powder with a uniform composition. The ball mill is set at a speed of 300r / min and runs for 4 hours.

[0032] S2. Baking powder: move the homogeneous alloy powder obtained in step S1 to a vacuum drying oven for vacuum drying and dehumidification treatment. The temperature is set at 75° C. and kept for 4 hours. After the heat preservation is over, take out the...

Embodiment 2

[0036] A multi-principal alloy suitable for additive manufacturing, the chemical formula of the multi-principal alloy is Ni 31 co 30 Cr 10 Fe 10 Al 18 Mo 1 , where the ratio of each element is mole percent.

[0037] The preparation method of the multi-principal alloy is the same as that of Example 1, except that the parameters selected in step S3 are slightly different. In this example, the scanning speed is 2.7 mm / s.

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Abstract

The invention discloses a double-phase high-entropy high-temperature alloy and an additive manufacturing method thereof, and belongs to the technical field of alloy additive manufacturing. The chemical formula of the alloy is NiaCobFecCrdAleXf, wherein a, b, c, d, e and f represent the molar percentages of the corresponding elements, a is 20%-70%, b is 20%-70%, c is 0-25%, d is 0-25%, and e is 14%-20%; X is one or more of Nb, Mo, W, Ti, Ta, Hf, Y, Re, Ru, B, Zr and C; the alloy is prepared from the components including, by weight, 0-2% of Nb, 0-2% of Mo, 0-3% of W, 0-3% of Ti, 0-2% of Ta, 0-1% of Hf, 0-0.5% of Y, 0-1% of Re, 0-1% of Ru, 0-0.2% of B, 0-0.1% of Zr and 0-0.2% of C. The eutectic multi-principal-element alloy with good additive manufacturing performance, low density and excellent high-temperature performance can be obtained.

Description

technical field [0001] The invention belongs to the technical field of alloy additive manufacturing, and in particular relates to a dual-phase high-entropy superalloy and an additive manufacturing method thereof. Background technique [0002] As the research frontier of advanced manufacturing technology, metal additive manufacturing has irreplaceable advantages in the near-net shape processing of high-performance complex components. Developed countries in Europe and the United States have placed metal additive manufacturing in a strategic position in technology development. However, additive manufacturing However, the forming defect has become one of the main bottlenecks restricting its development. The characteristics of high temperature gradient, rapid solidification, and cyclic heat history in the metal additive manufacturing process can easily lead to defects such as cracks and deformation in the material, which poses great challenges to the formability of additive manuf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00B33Y70/00C22C1/04B22F10/28
CPCC22C30/00C22C1/04B33Y70/00
Inventor 王志军周科璇吴庆峰柴子舒李俊杰王理林王锦程
Owner NORTHWESTERN POLYTECHNICAL UNIV