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High-speed laser cladding alloy powder and method for surface strengthening of centrifugal compressor

A centrifugal compressor and laser cladding technology, which is applied in the field of surface engineering application technology engineering and surface engineering, can solve the problems of small cracks in the coating, rough surface formation, and failure to achieve performance, so as to improve wettability and metallurgical bonding The effect of reducing strength and dilution rate

Active Publication Date: 2021-08-10
温岭艾斯达特新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of surface strengthening technology, compared with thermal spraying technology, laser cladding has significantly better metallurgical bonding strength than thermal spraying, but the surface is rough, and the thermal stress is too large to cause fine cracks in the coating
During use, it often causes stress corrosion and cannot achieve ideal performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 0Cr17Ni4Cu4Nb stainless steel (size: 100mm×50mm×10mm) was selected as the substrate for pretreatment before cladding: derusting, degreasing and sanding until the surface roughness was Ra=0.2μm, and finally cleaned with acetone and alcohol.

[0036] With argon as the protective atmosphere, laser cladding is performed using HGL-JKR5250 high-speed laser cladding machine. Among them, the power P is 1.5KW, the spot diameter D is 3mm, and the scanning speed V S 2m / s, powder feeding speed V f It is 10.2g / min, and the defocus is 2mm. CoCrTi (WC) alloy powder is used for high-speed laser cladding, and the proportion of alloy powder in this embodiment is 10% Co, 80% WC, 6% Cr, and 4% Ti. After that, laser remelting is performed. Microwave rapid annealing was performed on the formed cladding layer. The maximum annealing temperature was 500 °C, the heating and cooling rate was 100 °C / min, and the holding time was 5 min.

[0037] The appearance of the cladding layer of the sampl...

Embodiment 2

[0039] 0Cr17Ni4Cu4Nb spindle steel (size: 100mm×50mm×10mm) was selected as the substrate, and the pretreatment before cladding was carried out: derusting, degreasing and sanding until the surface roughness was Ra=0.2μm, and finally cleaned with acetone and alcohol.

[0040] With argon as the protective atmosphere, laser cladding is performed using HGL-JKR5250 high-speed laser cladding machine. Among them, the power P is 1KW, the spot diameter D is 3mm, and the scanning speed V S 1.2m / s, powder feeding speed V f It is 10.2g / min, and the defocus is 2mm. Co-WC-Cr-Ti alloy powder is used for high-speed laser cladding, and the proportion of Co-WC-Cr-Ti alloy powder in this embodiment is 12% Co, 78% WC, 5% Cr, and 5% Ti. After that, laser remelting is performed. Microwave rapid annealing was performed on the formed cladding layer. The maximum annealing temperature was 500 °C, the heating and cooling rate was 100 °C / min, and the holding time was 5 min.

[0041] The appearance of ...

Embodiment 3

[0043] 0Cr17Ni4Cu4Nb spindle steel (size: 100mm×50mm×10mm) was selected as the substrate, and the pretreatment before cladding was carried out: derusting, degreasing and sanding until the surface roughness was Ra=0.2μm, and finally cleaned with acetone and alcohol.

[0044] With argon as the protective atmosphere, laser cladding is performed using HGL-JKR5250 high-speed laser cladding machine. Among them, the power P is 1.5KW, the spot diameter D is 3mm, the scanning speed VS is 1.2m / s, the powder feeding speed Vf is 10.2g / min, and the defocus is 3mm. CoCrTi (WC) alloy powder is used for high-speed laser cladding, and the proportion of alloy powder in this embodiment is 15% Co, 74% WC, 6% Cr, and 5% Ti. After that, laser remelting is performed. Microwave rapid annealing was performed on the formed cladding layer. The maximum annealing temperature was 500 °C, the heating and cooling rate was 100 °C / min, and the holding time was 5 min.

[0045] The appearance of the cladding l...

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Abstract

The invention discloses a high-speed laser cladding alloy powder and a method for strengthening the surface of a centrifugal compressor, and develops an alloy powder for laser cladding suitable for improving the erosion resistance and cavitation resistance of a substrate and a corresponding high-speed laser cladding alloy powder. overlay process. Including mass percentage of raw materials: Co, nickel-coated WC, Cr, Ti and other components. In this method, Co, Cr, Ti elements are used to improve the wettability of the cladding layer and the substrate, improve the metallurgical bonding strength with the substrate, reduce the cracking sensitivity in the process of erosion and cavitation, and improve the oxidation resistance of the cladding layer. Performance; by adjusting the particle size, proportion and laser parameters of the alloy powder, the temperature field is reasonably controlled, the dilution rate is reduced, and the thermal stress at the interface is reduced; compared with the matrix, the erosion resistance is increased by 3 to 4 times, and the cavitation resistance is improved. 2 to 3 times.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, in particular to a high-speed laser cladding process and alloy powder for surface strengthening of blades, impellers and main shafts of centrifugal compressors, and belongs to the field of surface engineering application technology engineering. Background technique [0002] The blade, impeller and main shaft are the key components of the centrifugal compressor, used to assemble the impeller, balance disc, thrust disc, etc., and are the central part of the rotor. During the service period, it is in a state of high-speed operation, and the service environment is extremely harsh, which often causes surface erosion and cavitation, which are the main forms of failure of blades, impellers and main shafts. Improving the anti-erosion and anti-cavitation properties of its surface is a very important creative work in the field of surface engineering, and it is also the strategic demand for savi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C29/08
CPCC22C29/067C22C29/08C23C24/103
Inventor 畅庚榕刘明霞谢燕翔郭岩付福兴徐可为
Owner 温岭艾斯达特新材料科技有限公司
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