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Laser-cladding cobalt-base alloy powder and repairing method for repairing damaged expander blade

A technology of laser cladding and cobalt-based alloys, which is applied in the coating process and coating of metal materials, can solve problems such as tissue deterioration, achieve the effects of improving wear resistance, reducing cracking, and improving corrosion resistance

Active Publication Date: 2016-02-24
汉中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

Ni-based alloys have high hardness and corrosion resistance, but the high stress generated by laser rapid solidification is easy to cause the coating to form transverse penetrating cracks during lap cladding; The wear resistance and thermal shock resistance of the laser still need to be improved, especially for large-area laser multi-pass cladding. Because the lap area is remelted by the laser twice and the tempering effect of the rear road on the front road makes the The structure of the overlapping area of ​​the multi-layer cladding layer is obviously deteriorated, and the hardness of the multi-layer cladding layer under the same coating material is obviously lower than that of the single-layer coating

Method used

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  • Laser-cladding cobalt-base alloy powder and repairing method for repairing damaged expander blade
  • Laser-cladding cobalt-base alloy powder and repairing method for repairing damaged expander blade
  • Laser-cladding cobalt-base alloy powder and repairing method for repairing damaged expander blade

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 0Cr17Ni4Cu4Nb blade steel (size: 50mm×30mm×10mm) was selected as the substrate, and the pretreatment before cladding was carried out: degreasing, derusting 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 carried out by using HGL-JKR5250 multifunctional CNC laser cladding machine. Among them, the power P is 4KW, the spot diameter D is 3mm, the scanning speed VS is 3.0mm / s, and the powder feeding speed Vf is 10.2g / min. Co-based alloy powder with adjusted formula was used for laser cladding.

[0037] The proportion of Co-based alloy powder in this embodiment is 20.32% Co, 2.8% W, 2.48% Mo, 19.92% Cr, 44.18% Fe, 8.6% Ni, and the balance Si.

[0038]The cladding layer of the cladding sample has a bright appearance, no cracks, and good formability. The phase is austenite as the main phase, ferrite as the auxiliary phase, and the microstructure is fine dendr...

Embodiment 2

[0040] 0Cr17Ni4Cu4Nb blade steel (size: 50mm×30mm×10mm) was selected as the substrate, and the pretreatment before cladding was carried out: degreasing, derusting and sanding until the surface roughness was Ra=0.2μm, and finally cleaned with acetone and alcohol.

[0041] With argon as the protective atmosphere, laser cladding is carried out by using HGL-JKR5250 multifunctional CNC laser cladding machine. Among them, the power P is 4KW, the spot diameter D is 3mm, the scanning speed VS is 3.0mm / s, and the powder feeding speed Vf is 10.2g / min. Co-based alloy powder with adjusted formula was used for laser cladding.

[0042] The proportion of Co-based alloy powder in this embodiment is 34.17% Co, 1.18% W, 2.01% Mo, 23.39% Cr, 30.36% Fe, 8.0% Ni, and the balance Si.

[0043] The cladding layer of the cladding sample has a bright appearance, no cracks, and good formability. The phase is austenite as the main phase, ferrite as the auxiliary phase, and the microstructure is fine den...

Embodiment 3

[0045] Select the 0Cr17Ni4Cu4Nb blade to be repaired as the base, and carry out pretreatment before cladding: remove oil, rust, and fatigue layer 0.5-1mm, and sandpaper treatment until the surface roughness is Ra=0.2μm, followed by cleaning with acetone and alcohol, Finally, reverse modeling is carried out through laser three-dimensional scanning to determine the repaired part and size of the blade, and then laser repair is carried out.

[0046] With argon as the protective atmosphere, laser cladding is carried out by using HGL-JKR5250 multifunctional CNC laser cladding machine. Among them, the power P is 5KW, the spot diameter D is 3mm, the scanning speed VS is 3.0mm / s, and the powder feeding speed Vf is 10.2g / min. Co-based alloy powder with adjusted formula was used for laser cladding.

[0047] The proportion of Co-based alloy powder in this embodiment is 50.02% Co, 2.62% W, 7.88% Mo, 26.39% Cr, 12.36% Fe, 0% Ni, and the balance Si.

[0048] The cladding layer of the cladd...

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Abstract

The invention discloses laser-cladding cobalt-base alloy powder and a repairing method for repairing a damaged expander blade. The laser-cladding cobalt-base alloy powder comprises the following raw materials in percentage by mass: 20.0% to 50% of Co, 1.0% to 3.0% of W, 2.0% to 5.0% of Mo, 20.0% to 26.0% of Cr, 19.0% to 45.0% of Fe, 0 to 9% of Ni and the balance of Si. The repairing method comprises the following steps: pre-treating the damaged expander blade before laser cladding; performing reverse modeling by three-dimensional laser scanning; determining the to-be-repaired position and size of the blade; performing multi-track lapped laser cladding repair on the damaged expander blade by using the laser-cladding cobalt-base alloy powder. The laser-cladding cobalt-base alloy powder disclosed by the invention adopts austenite as a main phase; Co and Ni elements are used for stabilizing the main phase; W and Mo elements are added, and meanwhile, the content of Si and B elements is reduced, so the toughness and corrosion resistance are improved, and the phenomenon of cracking generated during multi-track lapping of a laser cladding layer is reduced. The alloy powder component has the effects of lowering the cost and improving the stability of a cladding technique, and the laser repair quality and the effective service life of the blade of an energy recycling turbo expander are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of remanufacturing, in particular to a laser cladding cobalt-based alloy powder for repairing the damaged surface of an energy recovery turbo expander blade, and belongs to the field of surface engineering application and remanufacturing technical engineering. Background technique [0002] Mechanical parts will be subject to surface wear and corrosion under different working conditions during service. It is a very important creative work in the field of remanufacturing to remanufacture and repair the damaged parts and then put them back into use. , to meet the strategic needs of the current social sustainable development. [0003] The blades, main shaft and other core components of energy recovery turbine (TRT) series expanders for medium and large equipment in metallurgy and petrochemical fields are all subjected to Al 2 o 3 , SiO 2 Erosion of solid particles and strong corrosive environment (CO 2 , H ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C19/07C22C38/44C22C38/52
CPCC22C19/07C22C38/44C22C38/52C23C24/106
Inventor 畅庚榕徐可为戴君张海存刘明霞撒兴军
Owner 汉中艾斯达特新材料科技有限公司
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