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Cavitation Erosion of Laser-Nitrided Ti–6Al–4V Alloys with the Energy Controlled by the Pulse Duration

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Abstract

The cavitation erosion of Ti–6Al–4V nitrided by Nd:YAG pulsed laser samples was investigated for different pulse durations. Hardness in the range of 1045–900HV0.2, was obtained for pulse duration ranging from 10 to 4 ms, respectively. All the Ti–6Al–4V nitrided samples showed a better cavitation erosion behavior compared to only annealed sample. The best behavior was observed for the sample nitrided with a 4-ms pulse and the weakest one 10-ms pulse. The harder nitride layer showed a brittle behavior during the process, leading to a reduced resistance during the cavitational attack. The more ductile surface of the annealed samples suffered a plastic deformation and the incipient damage generated by the cavitation bubbles lead to plastically deformed surface craters. By contrast, the nitrided samples with high hardness, low ductility and internal stresses increase the cracking sensibility and reduce the resistance to plastic deformation, leading to exfoliations in the brittle areas containing cracks.

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Acknowledgments

The support of the Romanian National Authority for Scientific Research, grant CNCS—UEFISCDI, Project Number PN-II-ID-PCE-2011-3-0837 is acknowledged.

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  1. Faculty of Mechanical Engineering, “Politehnica” University of Timisoara, Bd. Mihai Viteazul 1, 300006, Timisoara, Romania

    I. Mitelea, E. Dimian, I. Bordeaşu & C. Crăciunescu

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  1. I. Mitelea
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  2. E. Dimian
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  3. I. Bordeaşu
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  4. C. Crăciunescu
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Correspondence to C. Crăciunescu.

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Mitelea, I., Dimian, E., Bordeaşu, I. et al. Cavitation Erosion of Laser-Nitrided Ti–6Al–4V Alloys with the Energy Controlled by the Pulse Duration. Tribol Lett 59, 31 (2015). https://doi.org/10.1007/s11249-015-0558-6

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  • DOI: https://doi.org/10.1007/s11249-015-0558-6

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