Nanosecond-femtosecond laser composite impact strengthening system and method

Abstract

The invention relates to a nanosecond-femtosecond laser composite impact strengthening system. The nanosecond-femtosecond laser composite impact strengthening system comprises a nanosecond laser, a nanosecond laser correction lens group, a nanosecond laser electric shutter switch, a nanosecond laser reflector, a reflector, an objective lens, a water restraint layer system, a three-dimensional moving platform, a femtosecond laser, a femtosecond laser correction lens group, a femtosecond laser electric shutter switch, a femtosecond laser reflector and a control system, wherein the control system is used for controlling the nanosecond laser, the nanosecond laser electric shutter switch, the three-dimensional moving platform, the femtosecond laser and the femtosecond laser electric shutter switch; and the water restraint layer system is fixedly placed on the three-dimensional moving platform and is used for storing parts. The invention further relates to a nanosecond-femtosecond laser composite impact strengthening method. The nanosecond-femtosecond laser composite impact strengthening system and method aim to solve the problem that the final surface quality of laser impact strengthening parts is poor.

Description

technical field [0001] The invention relates to the technical field of laser applications, in particular to a nanosecond-femtosecond laser composite shock strengthening system and method. Background technique [0002] As a new surface modification technology, laser shock peening has been widely used in key structural components of major aviation equipment. The basic principle of this technology is: the use of short-pulse, high-peak power-density laser bombardment of the material surface to form high-temperature, high-pressure plasma, and then under the mechanical effect of GPa-level instantaneous high-pressure shock waves induced by it, plastic deformation occurs on the surface of the material, causing the lattice Distortion, dislocation, grain refinement and other microstructural changes and macroscopic residual compressive stress, realize the surface strengthening of parts, and greatly improve the wear resistance, corrosion resistance and fatigue resistance of metal materi...

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Problems solved by technology

[0006] The embodiment of the present invention provides a nanosecond-femtosecond laser composite shock strengthening system and method. By using a nanosecond laser to induce a high-pressure shock wave on the surface of a material covered with a constrained layer and an absorbing layer, a deep residual stress layer is formed inside the material. , grain refinement and plastic deformation, and then use the femtosecond laser to directly irradiate the surface, and use its ultrafast removal effect to level the surface after the nanosecond shock and achieve surface ablation removal, which solves the final problem of laser shock strengthened parts Technical issues with poor surface quality

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