Method with functions of preheating and postheating for forming crack-free coating with high efficiency by three-light-beam laser-cladding technique

A laser cladding and three-beam technology, which is applied in coatings, laser welding equipment, metal material coating technology, etc., can solve the problems of low processing efficiency of laser cladding technology, easy cracks in the cladding layer, and obstacles to wide application. , to achieve the effects of no deformation in the heat-affected zone, elimination of residual internal stress, and reduction of processing costs

Inactive Publication Date: 2012-03-21
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, thermal spraying has the advantages of flexible operation, simple equipment, and a wide range of spraying materials, but the disadvantage is that the coating is mechanically combined with the substrate, the compactness of the structure is poor, and the coating is easy to peel off during use.
However, laser cladding technology has problems such as low processing efficiency, relatively high production cost, and cracks in the cladding layer, which seriously hinder the wide application of this technology in the industrial field.

Method used

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  • Method with functions of preheating and postheating for forming crack-free coating with high efficiency by three-light-beam laser-cladding technique
  • Method with functions of preheating and postheating for forming crack-free coating with high efficiency by three-light-beam laser-cladding technique

Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] The cobalt-based alloy coating was prepared on the surface of the 42CrMo oil drill pipe by a high-efficiency three-beam laser cladding crack-free coating with preheating and postheating functions, and the thickness of the coating was 1.5 mm.

[0023] The implementation process of this embodiment is, as figure 1 shown.

[0024] (1) Use a grinding machine to derust the surface of 42CrMo oil drill pipe 9, then use a mixed solution of sodium hydroxide and sodium carbonate with a volume ratio of 1:1 to degrease, then wash and dry with pure water, and finally sandblasting;

[0025] (2) A laser beam splitter 11 with a fixed beam splitting ratio is used to divide the laser beam emitted by the Nd:YAG laser 2 with a power of 500 W into laser beam L1 and laser beam L2, and the laser beam L1 is reflected by the mirror 12 and focused by the focusing mirror 8 After focusing, it acts on the surface of 42CrMo oil drill pipe 9, and is used to preheat the surface of 42CrMo oil drill pi...

Embodiment 2

[0031]A nickel-based tungsten carbide composite coating was prepared on the surface of the 20Mn2 automobile half-shaft casing by a highly efficient three-beam laser cladding crack-free coating with preheating and postheating functions. The thickness of the coating is 2.0mm.

[0032] The implementation process of this embodiment is, as figure 1 shown.

[0033] (1) Use a grinder to derust the surface of the 20Mn2 automobile axle sleeve 9, then use a mixed solution of sodium hydroxide and sodium carbonate with a volume ratio of 1:1 to degrease, then clean it with pure water and dry it , and finally sandblasting;

[0034] (2) Using a laser beam splitter with a fixed splitting ratio, the laser beam emitted by the Nd:YAG laser 2 with a power of 2000 W is divided into laser beam L1 and laser beam L2, and the laser beam L1 is reflected by the mirror 12 and focused by the focusing mirror 8 After acting on the surface of the 20Mn2 automobile half-shaft sleeve 9, it is used to preheat ...

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Abstract

The invention discloses a method with functions of preheating and postheating for forming crack-free coating with high efficiency by a three-light-beam laser-cladding technique. The method comprises the following steps of: splitting a laser beam emitted by an Nd: YAG laser into two laser beams by using a laser beam splitter, namely a preheating laser beam for preheating the surface of a base material and a postheating laser beam for postheating the formed coating; then blowing alloy powder into a molten pool which is formed by focusing a laser beam emitted by a CO2 laser and acting the focused laser beam on the surface of the base material by using a powder nozzle, wherein after the CO2 laser beam moves away, a molten layer is cured and crystallized quickly to form the coating; and postheating the formed coating by adopting the postheating laser beam. The method has the advantages that: (1) the dilution rate of the coating is low and adjustable, and the coating is metallurgically combined with the base material, so the base material has a small thermal influence area and is deformation-free and crack-free; (2) residual inner stress in the coating can be eliminated effectively, a tissue can be improved, and the coating has high abrasion resistance, high corrosion resistance, high anti-cracking performance and high thermal shock resistance; and (3) relative to the processing efficiency in the conventional laser cladding technology, the processing efficiency in the method can be improved by 50 times to the maximum extent, so the processing cost is reduced greatly, and a large-scale industrialized application potential is realized.

Description

technical field [0001] The invention relates to a high-efficiency three-beam laser cladding crack-free coating method with preheating and postheating functions, belonging to the technical field of laser processing. Background technique [0002] Fracture, wear, corrosion, oxidation and burning after the interaction between the material and the surrounding environment, etc., generally start from the surface of the material, and then extend and develop in all directions. The damage and loss they bring have seriously affected the production. security and stability of life. Therefore, it is of great significance to use various surface protection technologies to improve the surface properties of materials, prolong their service life, and improve their operational stability, safety and reliability. [0003] At present, conventional surface protection technologies mainly include thermal spraying, surfacing, physical and chemical vapor deposition, and laser cladding. Among them, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10B23K26/34
Inventor 周圣丰戴晓琴
Owner NANCHANG HANGKONG UNIVERSITY
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