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A medium-entropy alloy material and application method for additive manufacturing

A technology of additive manufacturing and application methods, applied in the field of additive manufacturing, can solve the problems of poor toughness matching of high-entropy alloys, difficulty in maintaining the original structure, and difficulty in realizing industrialization, etc., to achieve low cost and prevent the formation of brittle intermediate phases , Environmentally friendly effect

Active Publication Date: 2021-10-22
SHANGHAI JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that the artificial introduction of other phases in the medium-entropy alloy leads to the generation of more brittle intermediate phases for additive manufacturing, which is difficult to produce under the large undercooling degree produced by additive manufacturing. Maintaining the original structure may even weaken the mechanical properties; high-entropy alloys often have poor strength and toughness matching, and their mechanical properties at low temperatures are generally weaker than those of medium-entropy alloys, and the process is complicated due to too many participating elements, making it difficult to achieve industrialization in production

Method used

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  • A medium-entropy alloy material and application method for additive manufacturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The powdered medium entropy alloy with a particle size of 0-25 μm is used, and the drug powder formula is Cr50%, Co30%, Ni20%, and the additive manufacturing is carried out. The steps are as follows:

[0032] Step 1) Select a 115mm×115mm stainless steel substrate and clean it until it is clean, free of oil, dust, rust, etc.;

[0033] Step 2) Use an industrial robot to carry a laser, and connect the laser cladding powder feeding system for the selected area in parallel. Dry and sieve the powder and fill it into the powder spreading system, and at the same time, the scraper in the powder spreading system spreads the first layer of powder on the substrate;

[0034] Step 3) Establish a 3D model of a cube array with a side length of 20mm to be printed in the software, convert it into a robot scanning path file, and input it into the robot control computer;

[0035] Step 4) Scan with a given path at a scanning speed of 800mm / s, a scanning distance of 0.03mm, a power of 160W,...

Embodiment 2

[0039] In this example, a powdered medium-entropy alloy with a particle size of 15-53 μm is used, and the powder formula is Cr33%, Co33%, and Ni34%, for additive manufacturing. The steps are as follows:

[0040] Step 1) Select a 115mm×115mm stainless steel substrate and clean it until it is clean, free of oil, dust, rust, etc.;

[0041] Step 2) Use an industrial robot to carry a laser, and connect the laser cladding powder feeding system for the selected area in parallel. Dry and sieve the powder and fill it into the powder spreading system, and at the same time, the scraper in the powder spreading system spreads the first layer of powder on the substrate;

[0042] Step 3) Establish a 3D model of a cylindrical array with a radius of 5mm and a height of 10mm to be printed in the software, convert it into a robot scanning path file, and input it into the robot control computer;

[0043] Step 4) According to the scanning speed of 1000mm / s, the scanning distance of 0.04mm, the po...

Embodiment 3

[0047] In this example, a powdered medium-entropy alloy with a particle size of 53-150 μm is used. The powder formula is Cr20%, Co50%, and Ni30%, and the additive manufacturing is carried out. The steps are as follows:

[0048] Step 1) Select a titanium substrate of 200mm×150mm, and clean it until it is clean, free of oil, dust, rust, etc.;

[0049] Step 2) Use an industrial robot to carry a laser, and connect the selected area laser cladding powder feeding system in parallel, dry and sieve the alloy powder and fill it into the powder feeding system;

[0050] Step 3) Establish a 3D model of a cube array with a side length of 20 mm to be printed in the software, convert it into a robot scanning path file, and input it into the robot control computer;

[0051] Step 4) According to the scanning speed of 700mm / s, the scanning distance of 3.0mm, the power of 3500W, the laser spot diameter of 2mm, and the layer thickness of 0.5mm, scan with a given path to form a molten pool; at the s...

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Abstract

The invention discloses a medium-entropy alloy material and an application method for additive manufacturing, and relates to the field of additive manufacturing. The application method is to select a metal substrate of suitable size, use a heat source to melt each component, input the scanning path file of the 3D model of the workpiece in the robot control computer, scan with a given path, and use wire cutting after all scanning is completed and cooled. The workpiece is separated from the substrate, and the workpiece is cleaned, ground and polished. The invention utilizes the strong solid solution strengthening effect in the medium-entropy alloy to obtain a printed workpiece with high strength and good strength and toughness matching, and at the same time utilizes the "diffusion retardation" effect to delay or even prevent the diffusion of the substrate material and prevent various brittleness. The formation of the mesophase; at the same time, the elements involved are few, the preparation is simple, it is easy to realize industrial production, and has the advantages of low cost and environmental friendliness.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and relates to a medium-entropy alloy material for additive manufacturing and an application method. Background technique [0002] High Entropy Alloy (HEA) is a branch of multi-principal alloy, which means a single-phase alloy composed of five or more elements. In high-entropy alloys, a variety of atomic radii are different, which brings great lattice distortion and makes the diffusion of atoms extremely difficult. This is the so-called "diffusion retardation" effect. At the same time, a variety of atoms contained in the high-entropy alloy form a single-phase solid solution, which has a strong solid-solution strengthening effect. As a result, materials made from high-entropy alloys can achieve high strength without machining. In addition, there are many core effects in high-entropy alloys, such as "high-entropy effect", "cocktail effect", and "lattice distortion effect", which determine th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00B22F3/105B22F10/28B23K9/04B33Y10/00B33Y70/00
CPCC22C30/00B23K9/044B33Y10/00B33Y70/00B22F10/00B22F10/66B22F10/22B22F10/25B22F10/36B22F10/366B22F10/68Y02P10/25
Inventor 冯凯李铸国王志远韩帛伦
Owner SHANGHAI JIAOTONG UNIV
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