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Method for assisting laser cladding process by virtue of static magnetic field

A laser cladding, magnetic field assisted technology, applied in the direction of metal material coating process, coating, etc., to achieve the effect of optimizing the comprehensive performance

Active Publication Date: 2015-12-09
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the existing problems of magnetic field-assisted laser cladding, and provide a new method of stable magnetic field-assisted laser cladding with a large range of action and a wide range of magnetic field strength.

Method used

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  • Method for assisting laser cladding process by virtue of static magnetic field
  • Method for assisting laser cladding process by virtue of static magnetic field
  • Method for assisting laser cladding process by virtue of static magnetic field

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Grinding, degreasing, cleaning, and drying the 45 steel cladding substrate with a size of 90mm×15mm×15mm;

[0032] (2) Fe55 alloy powder (the mass fractions of each element are: Cr18.13%, Si2.94%, C0.8%, Mn0.69%, Ni0.43%, FeBal.) placed in a drying oven at 80 ° C to dry 10h, after it cools down, place a preset layer with a size of 80mm×5mm×1mm on the surface of the 45 steel substrate, and place it in a drying oven at 80°C for 10h, then take it out and cool it for later use;

[0033] (3) Fix the cladding substrate on the sample fixture, adjust the position of the sample fixture relative to the magnetic field generator, make the area to be clad on the cladding substrate be at the center of the magnetic pole, and make the surface coating of the cladding substrate The length direction is perpendicular to the central axis of the magnetic pole, and the laser beam is focused and irradiated on the cladding substrate (laser process parameters: laser power 4.0kW, laser scanni...

Embodiment 2

[0036] (1) Grinding, degreasing, cleaning, and drying the 45 steel cladding substrate with a size of 90mm×15mm×15mm;

[0037] (2) Fe55 alloy powder (the mass fractions of each element are: Cr18.13%, Si2.94%, C0.8%, Mn0.69%, Ni0.43%, FeBal.) placed in a drying oven at 90 ° C to dry 8h, after it cools down, place a preset layer with a size of 80mm×5mm×1mm on the surface of 45 steel base material, and place it in a drying oven at 80°C for 10h, then take it out and cool it for later use;

[0038](3) Fix the cladding substrate on the sample fixture, adjust the position of the sample fixture relative to the magnetic field generator, make the area to be clad on the cladding substrate be at the center of the magnetic pole, and make the surface coating of the cladding substrate The length direction is perpendicular to the central axis of the magnetic pole, and the laser beam is focused and irradiated on the cladding substrate (laser process parameters: laser power 3.0kW, laser scanning...

Embodiment 3

[0041] (1) Grinding, degreasing, cleaning, and drying the 45 steel cladding substrate with a size of 90mm×15mm×15mm;

[0042] (2) Fe55 alloy powder (mass fractions of each element are: Cr18.13%, Si2.94%, C0.8%, Mn0.69%, Ni0.43%, FeBal.) placed in a drying oven at 100 ° C to dry 6h, after it cools down, place a preset layer with a size of 80mm×5mm×1mm on the surface of 45 steel base material, and place it in a drying oven at 80°C for 10 hours, then take it out and cool it for later use;

[0043] (3) Fix the cladding substrate on the sample fixture, adjust the position of the sample fixture relative to the magnetic field generator, make the area to be clad on the cladding substrate be at the center of the magnetic pole, and make the surface coating of the cladding substrate The length direction is perpendicular to the central axis of the magnetic pole, and the laser beam is focused and irradiated on the cladding substrate (laser process parameters: laser power 5.0kW, laser scann...

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Abstract

The invention discloses a method for assisting a laser cladding process by virtue of a static magnetic field, and belongs to the technical field of material surface modification. According to the method, a static magnetic field generation device is matched with laser cladding equipment, an excitation current is adjusted to obtain the static magnetic field with a corresponding intensity, and the static magnetic field acts on the two sides of a laser cladding pool, thus achieving the purposes of improving the microscopic structure of a cladding layer, uniformizing the chemical ingredients of the structure and improving the comprehensive performance of the cladding layer. The convection state and crystallization behaviour of a melt in the laser cladding pool are improved by externally adding the static magnetic field, and flexible regulation and control for the solidified organization of the laser cladding layer are finally realized, so that a part of columnar crystals and dendritic crystals of the coating structure are transformed to small isometric crystals, thus optimizing the comprehensive performances of the microscopic structure and the coating of the laser cladding layer to a certain extent.

Description

technical field [0001] The invention discloses a laser cladding process method assisted by a constant magnetic field, which belongs to the technical field of material surface modification. Background technique [0002] Laser cladding technology is a surface modification technology that fuses the cladding powder and the surface layer of the substrate through a high-energy density laser beam to form a solid metallurgical bonded coating with the substrate. Its purpose is to improve the wear resistance, corrosion resistance, heat resistance, fatigue resistance and high temperature oxidation resistance of the substrate. However, due to the characteristics of rapid heating and sudden cooling in the non-equilibrium solidification process, the formed cladding layer structure is prone to defects such as cracks and pores, which limits the industrial application of laser cladding technology. Therefore, improving the convection state and crystallization behavior of the laser molten poo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/106
Inventor 刘洪喜李庆玲张晓伟蒋业华
Owner KUNMING UNIV OF SCI & TECH
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