In-situ preparation method for manufacturing high-entropy alloy by gradient powder feeding laser additive material

A laser additive and high-entropy alloy technology, which is applied in the field of alloy materials, can solve the problems of coarse grains, poor forming of printed parts, serious heat accumulation of printed parts, etc. Effect

Active Publication Date: 2018-12-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cracks between the printed part and the substrate will greatly affect the heat conduction, resulting in serious heat accumulation of the printed part, resulting in coarse grains and even deformation
The breakage between the printed part and the substrate will cause inaccurate positioning of the laser spot, resulting in poor molding of the printed part

Method used

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  • In-situ preparation method for manufacturing high-entropy alloy by gradient powder feeding laser additive material
  • In-situ preparation method for manufacturing high-entropy alloy by gradient powder feeding laser additive material

Examples

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Embodiment 1

[0029] An in-situ preparation method for laser additive manufacturing of high-entropy alloys, comprising the following steps:

[0030] Step 1, raw material preparation, the spherical powder of Nb, Mo, W, Ti, Zr with a purity of 99.9%, the particle size of the spherical powder is in the range of 50-150 μm, and the spherical powder of Nb, Mo, W, Ti, Zr in an equal molar ratio Mixing, mixing the mixed spherical powder in a three-dimensional mixer for 3 hours, the cylinder speed is 30r / min, drying the uniformly mixed spherical powder in a vacuum dryer for 6 hours, the temperature is 90 degrees Celsius, and the vacuum degree is Relative pressure -0.95MPa, the first raw material powder is obtained after drying; dry the Mo spherical powder with a purity of 99.9% in a vacuum dryer for 6 hours, the temperature is 90 degrees Celsius, the vacuum degree is relative pressure -0.95MPa, and the drying is completed After obtaining the second raw material powder;

[0031] Step 2, additive pre...

Embodiment 1

[0039] Compared with the comparative example, the macroscopic transition of Example 1 is smoother, and there is no obvious dividing line. This phenomenon indicates that the interface between the printed layer and the substrate in Example 1 forms a gentle transition in composition. It helps to reduce the thermal expansion coefficient difference on both sides of the interface between the printing layer and the substrate, thereby reducing the cracking tendency of the interface between the printing layer of the substrate and the thermal cycle during the printing process.

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Abstract

The invention discloses an in-situ preparation method for manufacturing high-entropy alloy by gradient powder feeding laser additive materials. The in-situ preparation method comprises the following steps of raw material preparation and gradient powder feeding laser additive material preparation. The material forming efficiency prepared by the in-situ preparation method is high, and a part model is not subjected to technological constraints, so the in-situ preparation method can be used to prepare parts with complex shapes, and the near-net forming of the materials can be realized, the production cost of the parts is greatly reduced. Samples have good forming effect, no air holes and macroscopic cracks, no micro-air holes and micro-cracks, good density, uniform organization and coexistenceof three phase structures. Composition detecting is carried out by using an energy disperse spectroscopy, and the definition of high-entropy alloy is met from the composition. The boundary between aprinting layer and two sides of base is fuzzy, the combination is better, and the crack tendency is low. It can be concluded that the gradient powder feeding mode greatly reduces the crack tendency atthe joint.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and in particular relates to an in-situ preparation method for manufacturing high-entropy alloys by gradient powder-feeding laser 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 special properties, such as higher hardness, higher tensile strength, wear resistance and corrosion resistance, etc. [0003] At present, the main components of high-entropy alloys are divid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105C22C30/00B33Y10/00B33Y80/00
CPCC22C30/00B33Y10/00B33Y80/00B22F2999/00B22F10/00B22F10/25B22F10/34B22F10/36B22F10/32B22F2207/01Y02P10/25
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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