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Method for preparing air inlet edge surface wear-resistant anti-corrosion alloy coating of tail stage blade of steam turbine

A technology of last-stage blades and corrosion-resistant alloys, which is applied in the coating process of metal materials, coatings, etc., can solve problems such as not being seen, and achieve improved wear-resistant and corrosion-resistant performance and service life, and excellent wear-resistant and corrosion-resistant performance , the effect of uniform coating

Inactive Publication Date: 2012-05-16
SHENYANG DALU LASER COMPLETE EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for other specific equipment components, such as specific structures such as the inlet edge of the last stage blade of a steam turbine, the process parameters provided by the existing laser cladding process are obviously unable to adapt
[0013] After searching and checking by the applicant: there is no domestic precedent for using laser cladding process to prepare wear-resistant and anti-corrosion alloy coating on the inlet edge surface of the last stage blade of steam turbine. There are no relevant reports abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Repair of the inlet edge of the last stage blade of X company gas turbine.

[0029] The matrix material of the gas turbine blade inlet edge is 17-4PH; the chemical composition of the cobalt-based alloy powder is: C: 1.0%, Cr: 30%, Ni: 0.42%, Mn: 0.1%, Si: 1.1%, W: 3.8%, Fe: 0.6%, and the balance is Co.

[0030] The process is as follows: (1) Surface pretreatment of the inlet edge of the last stage blade of the gas turbine.

[0031] At room temperature, degrease and derust the surface of the inlet edge of the last stage blade of the gas turbine, and clean it with alcohol. Use coloring flaw detection method to inspect the processed part of the blade inlet edge surface, and it is required that the processed part has no cracks, pores, inclusions and other defects.

[0032] (2) Selection of alloy powder and adjustment of automatic powder feeding device.

[0033] Select cobalt-based alloy powder with excellent wear resistance and corrosion resistance...

Embodiment 2

[0042] Example 2: Repair of the inlet edge of the last stage blade of the gas turbine of XX Company.

[0043] The matrix material of the gas turbine blade inlet edge is 17-4PH; the chemical composition of the cobalt-based alloy powder is: C: 1.5%, Cr: 25%, Ni: 0.79%, Mn: 0.15%, Si: 1.2%, W: 5.0%, Fe: 0.8%, and the balance is Co.

[0044] The process is as follows: (1) Surface pretreatment of the inlet edge of the last stage blade of the gas turbine.

[0045] At room temperature, degrease and derust the surface of the inlet edge of the last stage blade of the gas turbine, and clean it with alcohol. Use coloring flaw detection method to inspect the processed part of the blade surface, and it is required that the processed part has no cracks, pores, inclusions and other defects.

[0046] (2) Selection of alloy powder and adjustment of automatic powder feeding device.

[0047] Select cobalt-based alloy powder with excellent wear resistance and corrosion resistance a...

Embodiment 3

[0056] Example 3: Repair of the inlet edge of the last stage blade of the gas turbine of XXX Company.

[0057] The matrix material of the gas turbine blade inlet edge is 17-4PH; the chemical composition of the cobalt-based alloy powder is: C: 1.2%, Cr: 27%, Ni: 0.44%, Mn: 0.12%, Si: 1.3%, W: 4.44%, Fe: 0.79%, and the balance is Co.

[0058] The process is as follows: (1) Surface pretreatment of the inlet edge of the last stage blade of the gas turbine.

[0059] At room temperature, degrease and derust the surface of the inlet edge of the last stage blade of the gas turbine, and clean it with alcohol. Use coloring flaw detection method to inspect the processed part of the blade surface, and it is required that the processed part has no cracks, pores, inclusions and other defects.

[0060] (2) Selection of alloy powder and adjustment of automatic powder feeding device.

[0061] Select cobalt-based alloy powder with excellent wear resistance and corrosion resistanc...

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Abstract

The invention relates to a method for preparing an air inlet edge surface wear-resistant anti-corrosion alloy coating of a tail stage blade of a steam turbine. The method is characterized by comprising the following steps that: 1) the air inlet edge surface of the tail stage blade of the steam turbine is pre-treated; 2) alloy powder is selected, and an automatic powder conveyor is regulated; 3) light beams are regulated; 4) the wear-resistant anti-corrosion coating laser cladding is carried out, a DL-HL-T5000 type CO2 laser is adopted, a work table is a SIMENS numerical control laser processing machine, a synchronous powder conveyor is adopted for conveying the alloy powder into a laser molten pool, high-power focus laser beams and an automatic powder conveying head are fed in the specified direction of the air inlet edge surface of the blade, and uniform and compact laser cladding layers are formed on the blade surface through processing; and 5) flaw detection is carried out after the cladding. According to the method, the laser cladding is adopted for uniformly cladding the alloy powder with the wear-resistant anti-corrosion performance onto the blade of the steam turbine, the uniform and compact metallurgical combining coatings are formed, the anti-corrosion performance reaches the stainless steel level, the cladding layer and a substrate form firm metallurgical combination, and the peeling is not easy to occur.

Description

technical field [0001] The invention relates to a method for preparing a wear-resistant and anti-corrosion alloy coating on the surface of power generation equipment components, in particular to a method for preparing a wear-resistant and anti-corrosion alloy coating on the air inlet edge surface of the last stage blade of a steam turbine using laser cladding technology, belonging to Laser cladding technology field. Background technique [0002] Blades are one of the finest and most important parts of a steam turbine. The safety and reliability of steam turbine blades are directly related to the safety and full operation of the steam turbine and the entire power plant. If 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 time, the accident will expand, which may lead to the destruction of the entire unit, and its economic loss is tens of thousan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C19/07
Inventor 陶兴启黄旭东崔忠宝王悦斌赵小书
Owner SHENYANG DALU LASER COMPLETE EQUIP
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