研究目的
To investigate the feasibility of laser peening of a 2024 aluminum alloy using a femtosecond laser with a pulse energy of up to 100 mJ, focusing on the effects of pulse energy, pulse duration, and beam spot size on peening performance.
研究成果
Femtosecond laser peening can impart compressive residual stresses to a depth of more than 100 μm in 2024-T3 aluminum alloy, with surface hardness enhanced by 12 to 37%. The highest laser intensity produces the best results in terms of residual stress and hardness enhancement. The study demonstrates the potential of high energy fs laser in peening applications, offering efficiency comparable to ns laser peening.
研究不足
The study is limited to the investigation of femtosecond laser peening on 2024 aluminum alloy without protective coating or transparent overlay. The effects of laser parameters are studied, but the underlying mechanisms of microstructural changes are not fully explored.
1：Experimental Design and Method Selection:
The study uses a high energy fs laser to peen 2024-T3 aluminum alloy samples without protective coating or transparent overlay. The effects of laser parameters on peening performance are investigated.
2：Sample Selection and Data Sources:
Square samples of 38×38×2 mm3 cut from a large plate of aluminum alloy 2024-T3 are used.
3：List of Experimental Equipment and Materials:
A high energy fs laser capable of emitting pulses with energy up to 100 mJ and duration from 25 fs to hundreds of fs, xyz translation stage, optical microscope, SEM, Vickers hardness tester, and x-ray diffraction equipment.
4：Experimental Procedures and Operational Workflow:
The laser beam is focused on the sample surface at normal incidence. A laser scan pattern with 50% overlap is used. Surface morphology is examined using an optical microscope and SEM. Microhardness is measured using a Vickers indenter. Residual stresses are measured using x-ray diffraction.
5：Data Analysis Methods:
The effects of laser parameters on surface morphology, residual stress, and microhardness are analyzed.
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