Dr. Delong Jia Profile

Dr. Delong Jia

at China Univ of Petroleum

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Publications (2)

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Proceedings Article | 2 December 2020 Paper

Effect of laser texture fitting grooves on plasma-sprayed filling coating model

Delong Jia, Peng Yi, Yancong Liu, Jiawei Sun, Qi Zhao, Shengbo Yue

Proceedings Volume 11717, 117171C (2020) https://doi.org/10.1117/12.2586635

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Laser surface texture and atmospheric plasma spraying technology were used to prepare molybdenum coating on AISI 304 stainless steel substrate. A 3D surface topography instrument was used to extract the groove profile and a quadratic parabola was used to fit the textured groove. Meanwhile, a numerical model was established in which multiple droplets filled a single measured and fitted groove. The solidification, defects, and wall temperature of the coating filled with the groove with droplets were compared with the parabola grooves. The simulation comparison between the fitted groove and measured groove shows that the splat was opening angle increases by 22.95%. The maximum heat flow rate transferred by the groove wall interface decreases by 10.1%. The solidification time trend is the same, whereas the filling splash of droplet fluid is reduced.

Proceedings Article | 15 November 2018 Paper

Study on the influence of scanning strategy on the morphology of laser micro-dimple texturing

Xianghua Zhan, Yancong Liu, Peng Yi, Delong Jia, Peifa Xiao

Proceedings Volume 10964, 109640P (2018) https://doi.org/10.1117/12.2504443

KEYWORDS: Metals, Laser applications, Laser ablation, Laser processing, Laser manufacturing

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Laser surface texturing is an advanced technology which can effectively improve surface tribological properties and has been attracted wide attention. However, the large diameter micro-dimple cannot be finished by fixed-point pulse processing, and fewer researches about the effect of laser scanning strategy on large diameter micro-dimple texture have been reported. Therefore, the effect of laser scanning strategy on the morphology of large diameter micro-dimple texturing is discussed in this work. An experiment of micro-dimple texturing on the 40Cr steel temples is performed by using a nanosecond laser. The effect of laser scanning mode on the micro-dimple texture is investigated to determine a reasonable laser scanning mode. Meanwhile, the influence of scanning interval on the micro-dimple texture with different diameters is studied under the best scanning mode. Results show that the diameter of the micro-dimples which are processed by the fixed-point pulse is about 48.1μm, and the spiral scanning is the best scanning mode for the large diameter micro-dimple texture. For spiral scanning, with the increase of scanning interval, the diameter of micro-dimples increases slightly, while the depth of micro-dimples, the height and the width of craters decreases. In order to ensure that the micro-dimple texture has good formability, the scanning interval can be properly floated on the basis of 10μm, but the scanning interval should not be close to the diameter of micro-dimples processed by the fixed-point pulse.

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