Laser reinforcing process of the intake side of turbine vane

A laser-strengthening, air-inlet technology, applied in manufacturing tools, heat treatment equipment, heat treatment process control, etc., can solve the problems of poor reliability, difficult operation, instability, etc., and achieve the best mechanical properties, easy operation, and good moisture resistance. effect of corrosion

Inactive Publication Date: 2006-03-01
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the disadvantages of difficult operation, instability and poor reliability in the existing blade laser strengthening technology, and provide a blade laser strengthening process with convenient operation, strong mechanical properties and good use effect

Method used

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  • Laser reinforcing process of the intake side of turbine vane

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Embodiment 1

[0018] Example 1: A light-absorbing material with a width of 20 mm is coated on a sample made of 0Cr17Ni4Cu4Nb (17-4PH), and the spot size is 18×12 (mm); the scanning speed is 120mm / min, and the power density is 800W / The laser beam of cm2 is used for solid solution treatment, and the cooling medium is water. The aging temperature is 460°C, and the holding time is 3.5 hours. Finally, a hardened layer with a hardness of HRC: 47, 47, 47, 48, 46 and a depth of 2 mm was obtained.

Embodiment 2

[0019] Embodiment 2: A light-absorbing material with a width of 20 mm is coated on the back arc side of the blade with a width of 0Cr17Ni4Cu4Nb (17-4PH), and the spot size is 18×12 (mm); the scanning speed is 80 mm / min , The laser beam with a power density of 755W / cm2 is used for solid solution treatment, and the cooling medium is water. The aging temperature is 480°C, and the holding time is 3.0 hours. Finally, a hardened layer with a hardness of HRC: 43, 40, 40, 44, 45 and a depth of 3 mm is obtained.

Embodiment 3

[0020] Embodiment three: a light-absorbing material with a width of about 16 millimeters is coated on the back arc side of the air inlet edge of the blade made of 0Cr17Ni4Cu4Nb (17-4PH), and the spot size is 14 × 12 (mm); the scanning speed is 180mm / min, the laser beam with a power density of 1100W / cm2 is used for solid solution treatment, and the cooling medium is argon. The aging temperature is 460°C, and the holding time is 2.0 hours. Finally, a hardened layer with a hardness of HRC: 48, 48, 47, 46, 46 and a depth of 1.5mm is obtained.

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Abstract

The laser reinforcing process is for treating the intake side of turbine vane made of super high strength stainless steel. The laser reinforcing process includes the following steps: cleaning the surface of the intake side to be treated; painting light absorbing alloy material; laser solid solution treatment of the selected area with proper laser beam after the alloy layer dries, with the laser solid solution treatment parameters including laser power density of 500-1200 w / sq cm, layer moving speed of 50-300 mm / min and solid solution treatment temperature of 1150-1600 deg.c; cooling while laser solid solution treatment; and final ageing treatment at temperature of 400-570 deg.c for 2.0-5.0 hr.

Description

(1) Technical field [0001] The invention belongs to the field of mechanical engineering, and relates to a steam turbine blade water-proof gas corrosion laser strengthening technology, which is suitable for the local strengthening treatment of the air inlet edge of the turbine blade of an aircraft, especially the blade of a steam turbine with more than 300MW. (2) Background technology [0002] Subcritical (300MW), supercritical (600MW) and even ultra-supercritical steam turbines have very high safety requirements, so their blades must also have high life and reliability. Due to the large radius of the steam turbine blades and the high temperature and rotation speed, the blades inevitably suffer from fatigue damage and water vapor corrosion. This requires the blade to have water cavitation resistance and more reliable comprehensive mechanical properties. Generally, the blades of steam turbines with smaller capacity are made of this 2Cr13, and methods such as high-frequency qu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/09C21D11/00
Inventor 姚建华楼程华陈智君
Owner ZHEJIANG UNIV OF TECH
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