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Effect of Plasma Nitriding Environment and Time on Plain Fatigue and Fretting Fatigue Behavior of Ti–6Al–4V

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Abstract

Plasma nitriding was performed on Ti–6Al–4V fatigue test samples at 520°C in two environments (nitrogen and nitrogen–hydrogen mixture in a ratio of 3:1) for two time periods (4 and 18 h). Plain fatigue and fretting fatigue tests were conducted on unnitrided and plasma nitrided samples. Plasma nitriding degraded lives under both plain fatigue and fretting fatigue loadings. The samples nitrided in nitrogen exhibited superior lives compared with the samples nitrided in the nitrogen–hydrogen mixture, possibly due to the relatively higher hardness (and presumably lower toughness) of the nitrided layer of the samples nitrided in the nitrogen–hydrogen mixture environment. For those samples nitrided in the nitrogen–hydrogen mixture, those nitrided for 18 h exhibited superior lives compared with those nitrided for 4 h. This trend was observed for samples nitrided in nitrogen gas at lower stress levels only; the converse was true at higher stress levels of 550 MPa and 700 MPa under plain fatigue loading. However, under fretting fatigue loading, the plasma nitriding time did not influence the lives significantly.

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  1. Department of Metallurgical and Materials Engineering, IIT Madras, Chennai, 600 036, India

    M. Mubarak Ali & S. Ganesh Sundara Raman

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  1. M. Mubarak Ali
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  2. S. Ganesh Sundara Raman
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Correspondence to S. Ganesh Sundara Raman.

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Mubarak Ali, M., Ganesh Sundara Raman, S. Effect of Plasma Nitriding Environment and Time on Plain Fatigue and Fretting Fatigue Behavior of Ti–6Al–4V. Tribol Lett 38, 291–299 (2010). https://doi.org/10.1007/s11249-010-9609-1

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  • DOI: https://doi.org/10.1007/s11249-010-9609-1

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