Ms. Xu Feng Profile

Xu Feng

at Jiangsu Univ

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Proceedings Article | 4 May 2015 Paper

Improving friction performance of cast iron by laser shock peening

Xu Feng, Jianzhong Zhou, Shu Huang, Jie Sheng, Yufen Mei, Hongda Zhou

Proceedings Volume 9543, 95431Z (2015) https://doi.org/10.1117/12.2182025

KEYWORDS: Iron, Scanning electron microscopy, Thermal effects, Laser energy, Profilometers, Statistical analysis, Electron microscopes, Nd:YAG lasers, Metals, Coating

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According to different purpose, some high or low friction coefficient of the material surface is required. In this study, micro-dent texture was fabricated on cast iron specimens by a set of laser shock peening (LSP) experiments under different laser energy, with different patterns of micro dimples in terms of the depth over diameter. The mechanism of LSP was discussed and surface morphology of the micro dimples were investigated by utilizing a Keyence KS-1100 3D optical surface profilometer. The tests under the conditions of dry and lubricating sliding friction were accomplished on the UMT-2 apparatus. The performance of treated samples during friction and wear tests were characterized and analyzed. Based on theoretical analysis and experimental study, friction performance of textured and untextured samples were studied and compared. Morphological characteristics were observed by scanning electron microscope (SEM) and compared after friction tests under dry condition. The results showed that friction coefficient of textured samples were obvious changed than smooth samples. It can be seen that LSP is an effective way to improve the friction performance of cast iron by fabricating high quality micro dimples on its surface, no matter what kind of engineering application mentioned in this paper.

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