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Proceedings Paper

Microhardness and microabrasion behaviour of NiTi shape memory alloy after femtosecond laser shock peening without coating in air
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Paper Abstract

The experiment study presents the influence of femtosecond laser shock peening (FsLSP) without a protective layer in the air on the surface hardness and surface mechanical property of NiTi shape memory alloy. Femtosecond laser shock peening is a new possibility of direct laser ablation without any protective layer under atmospheric conditions, which can produce intense shock waves with low pulse energy in the air. The average surface roughness values of the NiTi alloy samples were measured, because the surface roughness may affect its friction resistance. The results showed that the surface roughness of NiTi increased after femtosecond laser shock peening treatment. In comparison with the initial state, the coefficient of friction decreased and surface microhardness increased after femtosecond laser shock peening treatment with different FsLSP parameters. This improvement of wear properties may be attributed to the enhancement of surface microhardness and surface titanium oxide layer induced by the shock wave and laser ablation during FsLSP treatment.

Paper Details

Date Published: 2 March 2020
PDF: 6 pages
Proc. SPIE 11273, High-Power Laser Materials Processing: Applications, Diagnostics, and Systems IX, 1127301 (2 March 2020); doi: 10.1117/12.2543550
Show Author Affiliations
Hao Wang, Ruhr-Univ. Bochum (Germany)
Evgeny L. Gurevich, Ruhr-Univ. Bochum (Germany)
Münster Univ. of Applied Sciences (Germany)
Andreas Ostendorf, Ruhr-Univ. Bochum (Germany)


Published in SPIE Proceedings Vol. 11273:
High-Power Laser Materials Processing: Applications, Diagnostics, and Systems IX
Stefan Kaierle; Stefan W. Heinemann, Editor(s)

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