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A laser additive manufacturing method for wear-resistant high-entropy alloy gears

A high-entropy alloy and laser additive technology, applied in the field of gear manufacturing, can solve the problems of high cost and low yield, and achieve low-cost manufacturing, reduced consumption, and cost-saving effects

Active Publication Date: 2020-12-15
甘肃顺域新材料科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are shrinkage porosity, shrinkage cavities and cracks in the high-entropy alloy structure prepared by the melting method, and it is difficult to avoid metallurgical defects such as composition segregation and coarse structure. Therefore, the yield of high-entropy alloy gears currently produced is low and the cost is high.

Method used

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  • A laser additive manufacturing method for wear-resistant high-entropy alloy gears

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A. Turning the outer surface of the medium carbon steel round steel as the mandrel for laser additive manufacturing. The grade of sand cleaning is Sa3 grade, and the surface roughness Ra after sandblasting is 40 μm.

[0018] B. Preheat the mandrel, and use the laser cladding process to clad the nano-alumina-reinforced high-entropy alloy powder layer by layer on the mandrel to the required size. The chemical composition of the nano-alumina-reinforced high-entropy alloy powder is : AlCoCrFeNiTi 0.5 / (Al 2 o 3 )x, made by mixing pure metal powder and nano-alumina according to the atomic percentage ratio and ball milling, in which aluminum, cobalt, chromium, iron and nickel are in equimolar ratios, and the molar content of titanium is half of that of other metals. The molar content X of alumina is 0.05, that is, the molar content of nano-alumina is 0.05 times that of aluminum; the particle size of each metal powder is 40 μm, and the purity is greater than 99.5%; the part...

Embodiment 2

[0023] A. Turning the outer surface of the medium carbon steel round steel as the mandrel for laser additive manufacturing. After turning the medium carbon steel round steel, the outer surface roughness Ra is 65 μm, and sandblasting the outer surface of the mandrel. The grade of sand cleaning is Sa3 grade, and the surface roughness Ra after sandblasting is 70μm.

[0024] B. Preheat the mandrel, and use the laser cladding process to clad the nano-alumina-reinforced high-entropy alloy powder layer by layer on the mandrel to the required size. The chemical composition of the nano-alumina-reinforced high-entropy alloy powder is : AlCoCrFeNiTi 0.5 / (Al 2 o 3 )x, made by mixing pure metal powder and nano-alumina according to the atomic percentage ratio and ball milling, in which aluminum, cobalt, chromium, iron and nickel are in equimolar ratios, and the molar content of titanium is half of that of other metals. The molar content X of alumina is 0.2, that is, the molar content of...

Embodiment 3

[0029] A. Turning the outer surface of the medium carbon steel round steel as the mandrel for laser additive manufacturing. After turning the medium carbon steel round steel, the outer surface roughness Ra is 40 μm, and sandblasting the outer surface of the mandrel. The grade of sand cleaning is Sa3 grade, and the surface roughness Ra after sandblasting is 55 μm.

[0030] B. Preheat the mandrel, and use the laser cladding process to clad the nano-alumina-reinforced high-entropy alloy powder layer by layer on the mandrel to the required size. The chemical composition of the nano-alumina-reinforced high-entropy alloy powder is : AlCoCrFeNiTi 0.5 / (Al 2 o 3 )x, made by mixing pure metal powder and nano-alumina according to the atomic percentage ratio and ball milling, in which aluminum, cobalt, chromium, iron and nickel are in equimolar ratios, and the molar content of titanium is half of that of other metals. The molar content X of alumina is 0.12, that is, the molar content ...

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Abstract

The invention discloses a laser additive manufacturing method for wear-resistant high-entropy alloy gears, comprising the following steps: turning the outer surface of a medium-carbon steel round bar as a laser additive manufacturing mandrel, and performing a laser additive manufacturing mandrel on the outer surface of the mandrel. Sand blasting treatment; preheat the mandrel, and use the laser cladding process to clad the nano-alumina reinforced high-entropy alloy powder on the mandrel layer by layer to the required size; the mandrel bar after laser cladding Carry out heat treatment; machine the gears to the desired size. In the present invention, the high-entropy alloy powder reinforced by nano-alumina is clad on the mandrel by laser cladding process, and then mechanically processed to obtain a gear whose main body material is medium carbon steel and whose teeth are made of high-entropy alloy. This realizes high-efficiency and low-cost manufacturing of wear-resistant high-entropy alloy gears. The invention organically combines common medium carbon steel and novel high-entropy alloy, saves cost, and the teeth have good strength, toughness, wear resistance and fatigue resistance.

Description

technical field [0001] The invention belongs to the technical field of gear manufacturing, and in particular relates to a laser additive manufacturing method for wear-resistant high-entropy alloy gears. Background technique [0002] High-entropy alloy is a new type of multi-principal alloy developed in recent years. It has become a kind of high-potential alloy due to its good mechanical properties, oxidation resistance, wear resistance, corrosion resistance and high temperature thermal stability. new alloy. The most commonly used method for preparing bulk high-entropy alloys is arc melting, which has the characteristics of requiring less control process parameters and fast alloy cooling. However, there are shrinkage porosity, shrinkage cavities and cracks in the high-entropy alloy structure prepared by the melting method, and it is difficult to avoid metallurgical defects such as composition segregation and coarse structure. Therefore, the yield of high-entropy alloy gears ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F5/08B22F7/08B22F3/105B33Y10/00C22C30/00C22C32/00B33Y70/10
CPCC22C30/00C22C32/0015B22F5/08B22F7/08B33Y10/00B33Y70/00B22F10/00B22F10/32B22F10/66B22F10/25B22F10/64B22F10/36Y02P10/25
Inventor 李文欣韩杰胜凌文凯孟军虎张爱军董碧婷麻维刚孙国琴
Owner 甘肃顺域新材料科技有限公司