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Preparation method for water erosion resistant coating of last-stage long blade

A manufacturing method and technology of long blades, which are applied to the supporting elements, coatings, metal material coating processes of blades, etc., can solve the problems of low dilution rate and small deformation, avoid overheating, improve stability, and improve quality effect

Active Publication Date: 2013-09-04
SHANGHAI ELECTRIC POWER GENERATION EQUIPMENT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although the above-mentioned technical scheme given by the prior art uses the laser cladding process to repair the last-stage blade of the steam turbine, a cladding layer with a dense structure, no cracks, pores and other defects, and good corrosion resistance has been prepared, which has achieved a certain level of technical However, the above technology is only used for the repair of blades. For the key components of long blades of large-scale nuclear power steam turbines, can conventional laser cladding processes be used to prepare water-resistant layers with low dilution rate, good uniformity, and small deformation? After searching After verification, there is no precedent in China, and there are no relevant reports abroad.

Method used

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  • Preparation method for water erosion resistant coating of last-stage long blade

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Effect test

Embodiment 1

[0041] The invention is used for the manufacture of the water corrosion-resistant coating of the long blade of the low-pressure last stage of a large-scale nuclear power steam turbine. The process proceeds in the following steps:

[0042] Alloy powder selection and powder drying: select Stellite No. 6 cobalt-based alloy powder, ball mill the powder for 1 hour and dry at 150° C. for 1 hour.

[0043] Blade surface pretreatment: Degrease and derust the blade surface, and clean it with acetone. It is required that the blade surface has no defects such as cracks, pores, and inclusions.

[0044] Clamp the blade: clamp the blade on a specific mobile platform so that the blade is in a horizontal position.

[0045] Scanning trajectory setting: use Fanuc trajectory planning and control robot system to set the scanning trajectory of the laser.

[0046] Laser beam adjustment: adjust the defocus amount to make the focused laser spot a rectangle, and the spot size: length×width=3.2mm×2.0m...

Embodiment 2

[0058] The invention is used for the manufacture of the water corrosion-resistant coating of the long blade of the low-pressure last stage of a large-scale nuclear power steam turbine. The process proceeds in the following steps:

[0059] Alloy powder selection and powder drying: select Stellite No. 6 cobalt-based alloy powder, ball mill the powder for 1 hour and dry at 150° C. for 1 hour.

[0060] Blade surface pretreatment: Degrease and derust the blade surface, and clean it with acetone. It is required that the blade surface has no defects such as cracks, pores, and inclusions.

[0061] Clamp the blade: clamp the blade on a specific mobile platform so that the blade is in a horizontal position.

[0062] Scanning trajectory setting: use Fanuc trajectory planning and control robot system to set the scanning trajectory of the laser.

[0063] Laser beam adjustment: adjust the defocus amount to make the focused laser spot a rectangle, and the spot size: length×width=3.3mm×2.0m...

Embodiment 3

[0075] The invention is used for the manufacture of the water corrosion-resistant coating of the long blade of the low-pressure last stage of a large-scale nuclear power steam turbine. The process proceeds in the following steps:

[0076] Alloy powder selection and powder drying: select Stellite No. 6 cobalt-based alloy powder, ball mill the powder for 1 hour and dry at 150° C. for 1 hour.

[0077] Blade surface pretreatment: Degrease and derust the blade surface, and clean it with acetone. It is required that the blade surface has no defects such as cracks, pores, and inclusions.

[0078] Clamp the blade: clamp the blade on a specific mobile platform so that the blade is in a horizontal position.

[0079] Scanning trajectory setting: use Fanuc trajectory planning and control robot system to set the scanning trajectory of the laser.

[0080] Laser beam adjustment: adjust the defocus amount to make the focused laser spot a rectangle, and the spot size: length×width=3.3mm×2.0m...

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Abstract

The invention belongs to the laser cladding field, relates to a preparation method for a water erosion resistant coating of a last-stage long blade, and particularly relates to a method for preparing a water erosion resistant coating of a last-stage long blade of a large nuclear turbine. The preparation method for the water erosion resistant coating of the last-stage long blade comprises the following steps of drying alloy powder, clamping a blade on a platform with the blade in a horizontal position; selecting a semiconductor laser; adjusting by a coaxially focused powder feeding system; setting the size of a molten pool; and cladding the water erosion resistant coating by the laser. The preparation method can be used in preparing the water erosion resistant coating of the last-stage long blade of the large nuclear turbine. The hardness distribution of a cladding layer is uniform with an up-down deviation within 10% and the hardness of 500 HV; the thermal impact performance and water erosion resistance of the cladding layer are excellent; the deformation of the last-stage long blade after the laser cladding is small; and profile tolerance meets the processing and manufacturing technological requirements of the long blades by nuclear power.

Description

technical field [0001] The invention belongs to the field of laser cladding, and relates to a method for manufacturing a water erosion-resistant coating for last-stage long blades, in particular to a method for preparing a water-erosion-resistant coating for the last-stage long blades of a large-scale nuclear power steam turbine by laser cladding technology. Background technique [0002] The long blades of the last stage and the second last stage of nuclear power units work under the condition of wet steam. Due to the relatively low temperature and pressure of the low-pressure cylinder, the wet steam is easy to condense and form small water droplets during operation. Under the action of high peripheral speed and centrifugal force , the water droplets continuously hit the blade, which is easy to cause water erosion on the steam inlet side of the top of the blade. The water erosion of the blade will cause the honeycomb structure of the blade. In severe cases, the edge of the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10F01D5/28
Inventor 刘霞杨仁杰乔尚飞王晓娟李玉艳李铸国张轲
Owner SHANGHAI ELECTRIC POWER GENERATION EQUIPMENT CO LTD
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