High-entropy alloy powder and preparation method and application of laser cladding layer

A high-entropy alloy and laser cladding technology, which is applied in the coating process and coating of metal materials, can solve the problems of low service life, improve corrosion resistance, reduce diffusion and redistribution rate, and achieve good results

Inactive Publication Date: 2020-02-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

H13 die-casting molds are subjected to physical and chemical effects such as wear, thermal fatigue, erosion, stress corrosion, and surface heat welding during use, so their service life is relatively low

Method used

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  • High-entropy alloy powder and preparation method and application of laser cladding layer
  • High-entropy alloy powder and preparation method and application of laser cladding layer
  • High-entropy alloy powder and preparation method and application of laser cladding layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0032] 1. Calculate the ratio of FeCoCrNiMnAl high-entropy alloy powder according to the molar ratio: Fe is 16.67mol%, Co is 16.67mol%, Cr is 16.67mol%, Ni is 16.67mol%, Mn is 16.66mol%, Al is 16.66mol% , the total molar ratio is 100%, and electronic scales are used to weigh the powders 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, 92% and 8% ethanol to form a paste or paste, and then coat it on the surface of H13 steel with a preset layer thickness of 1mm. After air-drying, perform laser cladding.

[0035] 4. Laser cladding process parameters are: laser power 1550KW, spot diameter 2.5mm, scanning speed 5mm / s, defocus distance 10mm, protective gas argon, gas flow 25L / min.

[0036] 5. After laser cladding, aqua regia was used to corrode, and the metallographic photos of the cladding layer were obtained.

[0037] The microhardness of the cladding layer was measured b...

Embodiment example 2

[0040] 1. Mix the prepared laser cladding powder, 95% and 5% ethanol into a paste or paste, and coat it on the surface of H13 steel with a pre-set layer thickness of 1.2mm. After air-drying, perform laser cladding.

[0041] 2. Laser cladding process parameters are: laser power 1600KW, spot diameter 3.0mm, scanning speed 6mm / s, defocus distance 10mm, protective gas helium, gas flow rate 20L / min.

[0042] 3. Use the same performance test, the results are shown in the table below.

Embodiment example 3

[0044]1. Mix the prepared laser cladding powder, 94% and 6% ethanol into a paste or paste, and coat it on the surface of H13 steel with a pre-set layer thickness of 0.8mm. After air drying, perform laser cladding.

[0045] 2. Laser cladding process parameters are: laser power 1400KW, spot diameter 3.5mm, scanning speed 7mm / s, defocusing distance 10mm, protective gas argon, gas flow rate 22L / min.

[0046] 3. Use the same performance test, the results are shown in the table below.

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Abstract

The invention discloses high-entropy alloy powder and a preparation method and application of a laser cladding layer. The high-entropy alloy powder consists of Fe, Co, Cr, Mn, Ni and Al element powderin an equimolar ratio, the alloy powder is applied to laser cladding welding, the high-entropy alloy powder and ethanol are mixed and uniformly coat the surface of a base material, and the cladding layer can be obtained through laser cladding after drying. When laser cladding is carried out, the selected base material is H13 steel, the laser power is 1300-1600 KW, the light spot diameter is 2-4 mm, the scanning speed is 5-7 mm / s, the defocusing amount is 10 mm, and the protective gas flow rate is 20-25 L / min. Due to the fact that the chaos degree of the laser cladding high-entropy alloy coating is large, and becomes larger at high temperature, the high mixed entropy effect obviously reduces the diffusion and redistribution rates among elements, therefore, the phase structure in the coating is stable, the high-temperature hardness basically keeps unchanged, and the laser cladding high-entropy alloy coating has good high-temperature softening resistance.

Description

technical field [0001] The invention relates to the field of laser surface modification, more specifically, the field of preparation of high-entropy alloy powder and cladding layer for laser cladding. Background technique [0002] At present, the broad definition of high-entropy alloys refers to alloys composed of 5 to 13 main elements, and the content of each element is between 5% and 30%. Because of its unique phase structure, brand-new design concept and excellent alloy properties, multi-component high-entropy alloys have become a new research hotspot in the field of metal materials, and are called alloying theory together with rubber metals and bulk metallic glasses. Three major breakthroughs in the field in recent years. [0003] The diffusion activation energy of chaotic solid solution formed between different atoms of high-entropy alloy is relatively high, which will seriously hinder the diffusion process. Under the condition of heating, high-entropy alloy will still...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C23C24/10
CPCC22C30/00C23C24/106
Inventor 胡绳荪崔妍申俊琦
Owner TIANJIN UNIV
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