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Preparation method of laser cladding high-entropy alloy powder and cladding layer and application

A laser cladding and high-entropy alloy technology, applied in the coating process of metal materials, coatings, etc., can solve the problem of difficulty in obtaining a continuous cladding layer on the surface, and improve the performance of the cladding layer, improve corrosion resistance, hardness, etc. high effect

Inactive Publication Date: 2014-11-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the large differences in thermal physical properties such as density, melting point, specific heat and expansion coefficient between different types of metal elements in high-entropy alloy powders and between them and the base material, it is difficult to obtain surface continuity when directly used in laser cladding. , well-formed, uniform cladding layer

Method used

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  • Preparation method of laser cladding high-entropy alloy powder and cladding layer and application
  • Preparation method of laser cladding high-entropy alloy powder and cladding layer and application
  • Preparation method of laser cladding high-entropy alloy powder and cladding layer and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0032] 1. Calculate the proportion of FeNiCrAlSiMnx (take x=0) high-entropy alloy powder according to the molar ratio: Fe is 20mol%, Ni is 20mol%, Cr is 20mol%, Al is 20mol%, Si is 20mol%, and electronic weighing is used Take the powder of various elements.

[0033] 2. Pour into a mortar and grind in the mortar for half an hour to mix well.

[0034] 3. Mix the prepared laser cladding powder with 92% and 8% ethanol to form a paste or paste, and then coat it on the surface of 42CrMo steel with a pre-set layer thickness of 1 mm. After air-drying, perform laser cladding.

[0035] 4. The laser adopts JK2003SM type Nd:YAG, and the laser cladding process parameters are as follows: laser power is 1550KW, spot diameter is 0.8mm, scanning speed is 180mm / min, defocus is 0mm, protective gas is argon, and the gas flow rate is 25L / min.

[0036] 5. After laser cladding, use aqua regia to corrode, and obtain the metallographic photos of the cladding layer (the metallographic structure obser...

Embodiment example 2

[0042] 1. Calculate the proportion of FeNiCrAlSiMnx (take x=1) high-entropy alloy powder according to the molar ratio: Fe is 16.67mol%, Ni is 16.67mol%, Cr is 16.67mol%, Al is 16.67mol%, Si is 16.66mol% , Mn is 16.66mol%, the total molar ratio is 100%, and electronic scales are used to weigh the powders of various elements.

[0043] 2. Pour into a mortar and grind in the mortar for half an hour to mix well.

[0044] 3. Mix the prepared laser cladding powder with 95% and 5% ethanol to form a paste or paste, and then coat it on the surface of 42CrMo steel with a pre-set layer thickness of 2mm. After air-drying, perform laser cladding.

[0045]4. The laser adopts JK2003SM type Nd:YAG, and the laser cladding process parameters are as follows: laser power is 1550KW, spot diameter is 0.8mm, scanning speed is 180mm / min, defocus is 0mm, protective gas is argon, and the gas flow rate is 25L / min.

[0046] 5. After laser cladding, use aqua regia to corrode, and obtain the metallographi...

Embodiment example 3

[0052] 1. According to the molar ratio, FeNiCrAlSiMnx (take x = 0.3) high-entropy alloy powder ratio of each metal element: Fe, Ni, Cr, Al and Si are equimolar, Mn is 0.3 of Si molar number, mixed uniformly and used, Refer to the above implementation case

[0053] 2. Laser cladding process: the laser power is 1650KW, the spot diameter is 1.0mm, the scanning speed is 200mm / min, the defocus is 0mm, the protective gas is helium, and the gas flow rate is 20L / min

[0054] 3. Use the same performance test, the results are shown in the table below:

[0055] hardness

[0056]

Hardness value

Hardness value 2

Hardness value 3

average hardness

base material

286HV

282HV

285HV

284HV

FeNiCrAlSiMn 0.3 cladding layer

500.2HV

519.7HV

522.5HV

514.1HV

[0057] wear resistance

[0058]

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Abstract

The invention discloses a preparation method of laser cladding high-entropy alloy powder and a cladding layer and application. The laser cladding high-entropy alloy powder is composed of iron, nickel, chromium, aluminum, silicon and manganese element powder, the Fe, Ni, Cr, Al and Si are in equal mole ratio, and the mole ratio x of Mn is 0-1. The preparation method includes: conducting proportion calculation according to the mole ratio of each element, accurately weighing the mass of each component, then mixing the components fully and evenly, mixing the components with ethanol, coating the surface of a matrix material with the mixture evenly, performing drying, and then carrying out laser cladding so as to obtain the cladding layer. Specifically, the matrix material is 42CrMo steel. According to the preparation method of the laser cladding high-entropy alloy powder and cladding layer provided by the invention, the good cladding layer can be formed, and the material hardness and wear resistance can be improved.

Description

technical field [0001] The invention relates to the field of preparation of multi-principal laser cladding materials and cladding layers, and more specifically, to a preparation method and application of high-entropy alloy powder for laser cladding and cladding layers. Background technique [0002] Laser cladding is a surface modification technology that has developed rapidly in recent years. It adds cladding materials to the surface of the substrate and uses a high-energy-density laser beam to fuse it together with the thin layer on the surface of the substrate. A metallurgically bonded cladding layer is formed on the surface of the substrate. Traditional laser cladding powders are alloy systems based on a single principal element, such as nickel-based, iron-based, and cobalt-based self-fluxing alloy powders, while multi-principal element high-entropy alloys were developed by Taiwan scholar Ye Junwei in the 1990s. A new type of alloy proposed by the professor. The design c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C23C24/10
CPCC22C19/058C22C30/00C23C24/103
Inventor 罗震谈辉段瑞颜福裕
Owner TIANJIN UNIV
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