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Laser cladding method of steam turbine last-stage blade inlet edge surface

A last-stage blade and laser cladding technology, applied in the field of laser cladding, can solve the problems of large local stress, limited coating thickness, affecting the efficiency and operation safety of the steam turbine unit, and improve the corrosion resistance and service life. The effect of ensuring efficiency and operational safety

Inactive Publication Date: 2013-08-07
WUHAN DIANJIN LASER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the traditional brazing technology is used, due to the physical combination between the blade coating and the substrate, the bonding force is small, the thickness of the coating is limited, the structure is poor, the dilution rate is large, and there are many defects, which can easily cause excessive local stress
Therefore, after a long period of water erosion on the last stage blade of the steam turbine, the alloy layer peels off very seriously, resulting in poor thermal fatigue resistance and wear resistance of the blade, which affects the efficiency and operation safety of the steam turbine unit

Method used

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  • Laser cladding method of steam turbine last-stage blade inlet edge surface

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Pretreatment of the inlet edge surface of the last stage blade of the steam turbine;

[0061] Select the cobalt-based alloy powder, the weight percentage of each component of the cobalt-based alloy powder is:

[0062] C: 1.21%, Cr: 28.44%, Ni: 0.65%, Mn: 0.13%, Si: 1.25%, W: 4.44%, Fe: 0.79%, and the balance is Co;

[0063] Choose DJ-LPM-I type CO 2 Cross-flow laser or semiconductor laser and SIMENS CNC laser processing machine, adjust the synchronous powder feeding device of the CNC laser processing machine, so that the cobalt-based alloy powder is automatically fed into the laser molten pool of the CNC laser processing machine;

[0064] through the CO 2 A cross-flow laser or a semiconductor laser generates a high-power focused laser beam, and the high-power focused laser beam and the automatic powder feeding head are fed along the specified direction of the inlet edge surface of the last stage blade of the steam turbine for laser cladding. rotate at a rotating spee...

Embodiment 2

[0073] Pretreatment of the inlet edge surface of the last stage blade of the steam turbine;

[0074] Select the cobalt-based alloy powder, the weight percentage of each component of the cobalt-based alloy powder is:

[0075] C: 1.0%, Cr: 30%, Ni: 0.5%, Mn: 0.15%, Si: 1.0%, W: 3.5%, Fe: 0.9%, and the balance is Co;

[0076] Choose DJ-LPM-I type CO 2 Cross-flow laser or semiconductor laser and SIMENS CNC laser processing machine, adjust the synchronous powder feeding device of the CNC laser processing machine, so that the cobalt-based alloy powder is automatically fed into the laser molten pool of the CNC laser processing machine;

[0077] through the CO 2 A cross-flow laser or a semiconductor laser generates a high-power focused laser beam, and the high-power focused laser beam and the automatic powder feeding head are fed along the specified direction of the inlet edge surface of the last stage blade of the steam turbine for laser cladding. rotate at a rotating speed, and p...

Embodiment 3

[0086] Pretreatment of the inlet edge surface of the last stage blade of the steam turbine;

[0087] Select the cobalt-based alloy powder, the weight percentage of each component of the cobalt-based alloy powder is:

[0088] C: 1.5%, Cr: 25%, Ni: 0.9%, Mn: 0.1%, Si: 1.5%, W: 5.0%, Fe: 0.6%, and the balance is Co;

[0089] Choose DJ-LPM-I type CO 2 Cross-flow laser or semiconductor laser and SIMENS CNC laser processing machine, adjust the synchronous powder feeding device of the CNC laser processing machine, so that the cobalt-based alloy powder is automatically fed into the laser molten pool of the CNC laser processing machine;

[0090] through the CO 2 A cross-flow laser or a semiconductor laser generates a high-power focused laser beam, and the high-power focused laser beam and the automatic powder feeding head are fed along the specified direction of the inlet edge surface of the last stage blade of the steam turbine for laser cladding. rotate at a rotating speed, and pr...

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Abstract

The invention provides a laser cladding method of a steam turbine last-stage blade inlet edge surface. The method comprises the steps that: S1, the steam turbine last-stage blade inlet edge surface is pretreated; S2, cobalt-base alloy powder is selected; S3, a synchronized powder feeding device of a numerical control laser processing machine is adjusted, such that the cobalt-base alloy powder is automatically delivered into a laser melting pool of the numerical control laser processing machine; a high-power focused laser beam is produced by a CO2 cross-flow laser device or a semiconductor laser device; and the focused laser beam and an automatic powder feeding head are fed along a specified direction on the surface of the steam turbine last-stage blade inlet edge, such that a uniform and compact cobalt-base alloy powder clad layer is formed on the steam turbine last-stage blade surface; and S4, with a dye penetrant method, the laser clad part on the steam turbine last-stage blade inlet edge surface is tested. With the method provided by the invention, steam turbine blade corrosion resistance and service life are greatly improved, and steam turbine set efficiency and operation safety are ensured.

Description

[0001] technical field [0002] The invention relates to the technical field of laser cladding, in particular to a laser cladding method for the inlet edge surface of the last stage blade of a steam turbine. [0003] Background technique [0004] A steam turbine is a rotating machine powered by steam and converts the thermal energy of steam into mechanical work. It is the most widely used prime mover in modern thermal power plants. It has the advantages of high single-machine power, high efficiency, and long life. [0005] Among them, the blade is one of the most delicate and important parts of the steam turbine. The safety and reliability of the steam turbine blade is directly related to the safety and working efficiency of the steam turbine and even the entire power plant equipment. Once the blade breaks, it will cause vibration of the unit, dynamic and static friction of the flow part, and loss of efficiency at the same time; if it is not detected or dealt with in tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C19/07
Inventor 陶兴启黄旭东廖运生
Owner WUHAN DIANJIN LASER TECH