Method for improving fatigue wear resistance of blade

Abstract

The invention relates to a method for improving the fatigue wear resistance of a blade. The method comprises the steps that the surface of a blade blank is ultrasonically cleaned to remove surface stains; cast steel shots are adopted to perform shot peening treatment on the cleaned blade blank; the blade blank is placed in a siphon type manual sand blasting machine for micro sand blasting pretreatment, and then ultrasonic cleaning and drying are carried out with a metal cleaning solution and anhydrous ethanol; the dried blade blank is placed into a vacuum chamber of coating deposition equipment, the blade blank is installed on a rotating tool, and good electric contact between the blade blank and a base is ensured; the vacuum chamber is evacuated, argon gas is introduced, the gas pressureis controlled to be within a predetermined range, a gas ion source is started, and argon ion cleaning is performed on the blade blank; and the nitrogen flow rate and the argon gas flow rate are adjusted, the air pressure is controlled between 0.1 Pa and 0.2 Pa, a pulse bias power supply is turned on, the frequency value and the arc target current are adjusted, and TiN coating deposition is performed on the surface of the blade blank.

Description

technical field [0001] The invention relates to the technical field of aeroengine blades, in particular to a method for improving the fatigue wear resistance of blades. Background technique [0002] During the flight of the helicopter, particles such as sand and dust or ice are often inhaled, which erode the engine compressor blades to form corrosion spots, grinding marks, etc., and even cause loss of surface materials. These damages will lead to the appearance of gaps and cracks. Compressor blades are subjected to high tensile and vibration stresses during operation. High-speed rotating blades are very sensitive to surface damage. These surface damages aggravate the stress concentration at the leading and trailing edges of the compressor blades, seriously reduce the fatigue life of the blades, and affect the life and safety of the engine. Such surface damage needs to be protected. The protection of surface damage such as scouring wear can be realized by the superhard wear-...

AI Technical Summary

Problems solved by technology

[0003] Using superhard coating or laser shock strengthening technology alone can reduce the damage of erosion wear to a certain extent, but if the two technologies are combined, on the one hand, it can prevent foreign object damage. Due to the effect of laser shock strengthening on inhibiting crack growth, occurrence It becomes more difficult for cracks to propagate inward after foreign object damage, and the damage to the fatigue performance of the blade will also be weakened

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