Dr. Tong Liu Profile

Dr. Tong Liu

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Proceedings Article | 16 December 2022 Paper

Femtosecond laser processing of micro texture and experimental study on friction and wear

Tong Liu, Chunhai Guo, Li Zhang, Jianqiang Ma, Wenwu Zhang

Proceedings Volume 12501, 125010M (2022) https://doi.org/10.1117/12.2656172

KEYWORDS: Laser processing, Femtosecond phenomena, Pulsed laser operation, Confocal microscopy

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In order to improve the surface friction properties of 7075 aluminum alloy, micro textures with different morphology and spacing were processed on the surface of 7075 aluminum alloy by femtosecond laser. The size and morphology of laser processing texture were tested by laser confocal microscope, and the parameters of laser processing micro texture were optimized. The results show that due to the different characteristics of oxide layer and internal material on the surface of aluminum alloy, micro texture morphology cannot be processed on the surface when the single pulse energy is too small; When the single pulse energy is too large, the texture depth is too large, which will affect the lubrication and drag reduction performance. The GF-I reciprocating friction and wear tester was used for friction and wear test to explore the area ratio of the optimal drag reduction performance of each micro texture under the load of 0.07m/s and 40n. The experimental results show that the friction coefficient is the smallest when the area ratio of each micro texture morphology is about 8%. In the regular hexagon, the micro texture spacing is 400 μm has the best drag reduction effect, and the drag reduction rate is 36.76% compared with the non textured surface.

Proceedings Article | 31 August 2021 Paper

Experimental study on micro texture processed by coaxial water assisted laser processing

Tong Liu, Chunhai Guo, Jianqiang Ma, Chenhu Yuan, Bin Wang, Xiaowen Cao, Wenwu Zhang

Proceedings Volume 11907, 119071G (2021) https://doi.org/10.1117/12.2602990

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In recent years, micro texture has been widely used in bearing and tool friction reduction. Laser machining is one of the most commonly used methods to process micro texture. Aiming at the recast layer and heat affected zone produced in laser texturing process, a water assisted laser processing technology was used to eliminate the adverse effects as much as possible. Taking 304 stainless steel as the research object, the effects of laser processing in the air and water assisted laser processing on the processing area and micro texture edge morphology were compared and analyzed. The influence of two machining methods on friction coefficient of lubrication micro texture friction pair was analyzed. The results show that the water assisted machining method reduces the heat affected zone and the cone angle of the edge. Moreover, water assisted laser processing avoids the generation of micro cracks which is very beneficial to the texture process of laser processing.

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