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Preparation method for metal-doped modified turbine blade laser cladding surface coating layer

A laser cladding and turbine blade technology, applied in metal material coating process, coating and other directions, can solve the problems of matching between repair layer and substrate, high production cost, poor technical practicability, etc.

Pending Publication Date: 2019-05-21
XIAN UNVERSITY OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of such coating materials has the problem of matching between the repair layer and the substrate, and at the same time, the production cost is high and the technical practicability is poor

Method used

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  • Preparation method for metal-doped modified turbine blade laser cladding surface coating layer
  • Preparation method for metal-doped modified turbine blade laser cladding surface coating layer
  • Preparation method for metal-doped modified turbine blade laser cladding surface coating layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Metal-doped modified laser cladding coatings were prepared on 17-4PH stainless steel using a coaxial powder-feeding fiber laser device.

[0039] In this example, the weight ratio of the Mo alloy powder doped in the laser cladding powder to the 17-4PH powder is 1:99, and the specific ratio of the composite powder is 1.0% Mo, 15.0% Cr, 4.0% Ni, 3.1% Cu, 0.24 %Nb, 0.04%C, 1.0%Si, 0.4%Mn, 0.025%S, 0.03%P, 75.17%Fe. The composite powder was mixed by a ball mill for 60 minutes, and then dried at 150°C for 3 hours for use. During laser cladding, the laser power is 1200W, the scanning speed is 600mm / min, the powder feeding pressure is 0.3MPa, the powder feeding voltage is 20V, the Ar pressure is 0.05MPa, the overlap rate is 33.3%; the laser cladding layer is 1 layer, and the final thickness of the coating is 320μm.

[0040] The prepared coating has uniform structure and good compactness. The metallographic structure is a mixed double structure of dendritic martensite and auste...

Embodiment 2

[0042] Metal-doped modified laser cladding coatings were prepared on 17-4PH stainless steel using a coaxial powder-feeding fiber laser device.

[0043] In this example, the weight ratio of the Mo alloy powder doped in the laser cladding powder to the 17-4PH powder is 2:98, and the specific ratio of the composite powder is 2.0% Mo, 15.9% Cr, 3.5% Ni, 2.8% Cu, 0.15 %Nb, 0.04%C, 0.8%Si, 0.5%Mn, 0.028%S, 0.025%P, 74.26%Fe. The composite powder was mixed by a ball mill for 60 minutes, and then dried at 150°C for 5 hours for use; during laser cladding, the laser power was 1350W, the scanning speed was 700mm / min, the powder feeding pressure was 0.3MPa, the powder feeding voltage was 20V, the Ar pressure was 0.05MPa, and the lap rate 66.7%; 1 layer of laser cladding, the final thickness of the coating is 390 μm.

[0044] The prepared coating has uniform structure and good compactness. The metallographic structure is a mixed double structure of dendritic martensite and austenite, and ...

Embodiment 3

[0046] Metal-doped modified laser cladding coatings were prepared on 17-4PH stainless steel using a coaxial powder-feeding fiber laser device.

[0047] In this example, the weight ratio of the Mo alloy powder doped in the laser cladding powder to the 17-4PH powder is 4:96, and the specific ratio of the composite powder is 4.0% Mo, 15.3% Cr, 4.5% Ni, 3.5% Cu, 0.32 %Nb, 0.03%C, 0.6%Si, 0.5%Mn, 0.029%S, 0.027%P, 71.20%Fe. The composite powder was mixed by a ball mill for 120 minutes, and then dried at 150°C for 3 hours for use; during laser cladding, the laser power was 1500W, the scanning speed was 800mm / min, the powder feeding pressure was 0.3MPa, the powder feeding voltage was 20V, and the Ar pressure was 0.05MPa. 50.0%; 3 layers of laser cladding, the final thickness of the coating is 830 μm.

[0048] The prepared coating has uniform structure and good compactness. The metallographic structure is a mixed double structure of dendritic martensite and austenite, and the lath ma...

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Abstract

The invention discloses a preparation method for a metal-doped modified turbine blade laser cladding surface coating layer. The preparation method comprises the following steps of performing cleaningpretreatment on a 17-4PH stainless steel blade matrix material; doping Mo powder into 17-4PH powder, performing full and uniform mixing in a ball mill, performing heating and drying in a drying furnace, and taking the dried powder as laser cladding composite powder for standby; under the argon condition, adopting a laser cladding process to enable the laser cladding composite powder to clad on thepretreated 17-4PH stainless steel blade matrix; and performing microscopic structure analysis and performance detection on a coating layer. The coating layer is high in hardness, excellent in corrosion resistance and good in structural stability; and through metallurgical bonding with the matrix, the coating layer is reasonable in cost and can better meet the service requirements of turbine powermechanical engineering.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, and in particular relates to a method for designing and preparing a corrosion-resistant and wear-resistant coating on the surface of martensitic stainless steel laser cladding for metal-doped modified 17-4PH blades. A new surface protection material application technology in the manufacturing field. Background technique [0002] With the vigorous development of circular economy, blast furnace energy recovery turbine (TRT for short) has been widely used in my country's metallurgical field, effectively reducing industrial waste gas emissions and achieving good economic and social benefits. The long-term safe operation of such turbines is the key to the continuous energy recovery of the blast furnace. Among them, the TRT blade is the core component of the blast furnace energy recovery turbine equipment, and its safety and reliability directly affect the long-term operation of the unit. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C38/44C22C38/42C22C38/48C22C38/02C22C38/04
Inventor 刘明霞赵泽妮谢燕翔畅庚榕戴君余历军付福兴何斌锋
Owner XIAN UNVERSITY OF ARTS & SCI
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