Method for improving cavitation resistance of material by using laser shock peening technology

Abstract

The invention relates to a method for improving cavitation resistance of a material by using a laser shock peening technology, which comprises the following steps of: irradiating a metal surface by using laser with short pulse and high peak power density, so that an absorption protection layer coated on the metal surface absorbs laser energy and generates explosive gasification evaporation to generate high-temperature and high-pressure plasma; the plasma is restrained by the restraint layer, high-pressure shock waves are formed and spread into the material, plastic deformation is generated on the surface layer of the material through the force effect of the shock waves, the microstructure of the material on the surface layer is changed, compressive stress is left on the deep thickness, and therefore the fatigue resistance, abrasion resistance, stress corrosion resistance and other performance of the metal material are remarkably improved. The cavitation resistance of the material can be effectively improved.

Description

technical field [0001] The present invention relates to the technical field of laser shock strengthening and the field of cavitation, in particular to a method for improving the cavitation resistance of materials by using laser shock strengthening technology. Background technique [0002] Regarding the experimental research on cavitation, in addition to the ultrasonic cavitation experiment that has been included in the national standard, according to different fluid conditions, Venturi tubes, rotating disk instruments, etc. are also used. The more commonly used cavitation test methods mainly include the following: [0003] (1) Magnetostrictive vibration cavitation method [0004] The basic principle of the ultrasonic stretching vibration cavitation method is to use the characteristics of the magnetotropic sensor or piezoelectric sensor that can be elongated or shortened under the action of alternating current. The sample placed at the end of the transducer is generated in t...

AI Technical Summary

Problems solved by technology

Its cavitation ability is higher than that of Venturi tube type cavitation method, and its disadvantage is that the water flow in the equipment is more complicated than that of Venturi tube type cavitation equipment or magnetostrictive instrument, and the test period is long

Comparing the above different cavitation test methods, it is not difficult to find that for different cavitation methods, the results are difficult to compare with each other because of the different time and space characteristics used.

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