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Cobalt-based alloy powder for laser cladding of steam turbine last-stage blade

A last-stage blade and laser cladding technology, which is applied in the coating process of metal materials, coatings, etc., to achieve the effects of improving crack resistance, increasing anti-oxidation, and improving grain boundary quality

Inactive Publication Date: 2011-04-20
成都大陆激光技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After the applicant's search and verification: there is no relevant report in this regard at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] 5000W CO with stable cladding performance 2 The laser is used to perform laser cladding on the failed steam turbine final stage blade (material is 2Cr13). The mass percent of the designed cobalt-based alloy powder alloying elements is:

[0030] C: 0.6%; Cr: 26%; W: 7%; Ni: 10%; Mn: 0.5%; Si: 0.6%; Zr: 0.03%;

[0031] Hf: 0.3%; Co: balance.

[0032] The cladding process parameters are: power: 2500-3500W, focal length: 300-400mm, spot diameter: 3-6mm, scanning speed: 240-400mm / min, powder thickness: 0.3-1.0mm.

example 2

[0034] 5000W CO with stable cladding performance 2 Laser, laser cladding on the failed steam turbine last stage blade. The mass percentages of the designed cobalt-based alloy powder alloy elements are: C: 0.7%; Cr: 28%; W: 8%; Ni: 11%; Mn: 0.4%; Si: 0.8%; Zr: 0.04%; Hf: 0.4%; Co: balance.

[0035] The cladding process parameters are: power: 2500-3500W, focal length: 300-400mm, spot diameter: 3-6mm, scanning speed: 240-400mm / min, powder thickness: 0.3-1.0mm.

example 3

[0037] 5000W CO with stable cladding performance 2 Laser, laser cladding on the failed steam turbine last stage blade. The mass percent of the designed cobalt-based alloy powder alloying elements is:

[0038] C: 0.8%; Cr: 29.5%; W: 8.8%; Ni: 11.6%; Mn: 0.5%; Si: 0.85%; Zr: 0.05%;

[0039] The cladding process parameters are: power: 2500-3500W, focal length: 300-400mm, spot diameter: 3-6mm, scanning speed: 240-400mm / min, powder thickness: 0.3-1.0mm.

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Abstract

The invention discloses cobalt-based alloy powder for the laser cladding of a steam turbine last-stage blade. The powder comprises Cr, W, Co, Zr and Hf and is characterized by also comprising Ni, Mn, Si and C, wherein the powder comprises the following components in percentage by mass: 0.4 to 0.9 percent of C, 24 to 30 percent of Cr, 6 to 10 percent of W, 8 to 14 percent of Ni, 0.3 to 0.8 percent of Mn, 0.5 to 1.0 percent of Si, 0.02 to 0.06 percent of Zr, 0.25 to 0.5 percent of Hf and the balance of Co. The powder is cladded on a disabled steam turbine last-stage blade by a laser cladding processing method to form a cobalt-based alloy coating with high hardness, oxidation resistance, corrosion resistance, erosive wear resistance, high strength and high cladding performance so as to solve the technical problem of the repair of the steam turbine last-stage blade.

Description

Technical field: [0001] The invention relates to an alloy powder material suitable for laser cladding, in particular to a cobalt-based alloy powder used for laser cladding of the last stage blade of a steam turbine, which belongs to the C23C24 / 10(2006.01) I technology in the international patent classification table field. Background technique: [0002] The blade is one of the most delicate and important parts of the steam turbine. The safe and reliable operation of the steam turbine blade has a decisive impact on the safety and reliability of the unit, and is directly related to the safety and full operation of the steam turbine and the entire power plant. Due to various reasons, steam turbine blades, especially the final stage blades, inevitably suffer from erosion damage of steam outlet edge water, foreign hard foreign matter damage and solid particle erosion, which lead to blade fracture, fouling, cavitation and other failure damages. , and then cause unit vibration, dy...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C19/07C22C30/00
Inventor 陈常义陈江
Owner 成都大陆激光技术有限公司
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