Effective femtosecond laser shock peening on a Mg–3Gd alloy at low pulse energy 430 µJ of 1 kHz

Chenghao Lu; Licheng Ge; Bing Zhu; Yangxin Li; Xianfeng Chen; Xiaoqin Zeng; Yuping Chen

Journal of Magnesium and Alloys (Sep 2019)

Effective femtosecond laser shock peening on a Mg–3Gd alloy at low pulse energy 430 µJ of 1 kHz

Chenghao Lu,
Licheng Ge,
Bing Zhu,
Yangxin Li,
Xianfeng Chen,
Xiaoqin Zeng,
Yuping Chen

Affiliations

Chenghao Lu: State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, PR China
Licheng Ge: State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, PR China
Bing Zhu: State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, PR China
Yangxin Li: National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, PR China
Xianfeng Chen: State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, PR China
Xiaoqin Zeng: National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, PR China
Yuping Chen: State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, PR China; Corresponding author.

Journal volume & issue: Vol. 7, no. 3
pp. 529 – 535

Abstract

Read online

In this paper, microstructure evolution and hardness of Mg-3Gd alloy treated by femtosecond (fs) laser shock peening (LSP) with direct and confined ablation modes were investigated in detail. Under a relatively low pulse energy of 430 µJ with a repetition of 1 kHz, the surface hardness of sample has been enhanced by 70% effectively. Compared with ns-LSP with pulse fluence of 71.7 J/cm2, fs-LSP with pulse fluence of 34.2 J/cm2 is superior in the hardness increment, both of which are in the same order of magnitude. A distinct grain refinement of surface layer has been discovered and results in the increase of hardness. Nonuse of absorption and confining layers and the employment of the industry commercial fs laser with high repetition can inspire big potential LSP application in special metal material. Keywords: Laser shock peening, Femtosecond laser, Mg–3Gd alloy hardness, Surface treatment

Published in Journal of Magnesium and Alloys

ISSN: 2213-9567 (Online)
Publisher: KeAi Communications Co., Ltd.
Country of publisher: China
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.keaipublishing.com/en/journals/journal-of-magnesium-and-alloys/

About the journal