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Laser surface nitriding of Ti6Al4V alloy coupled with an external stress field

Published online by Cambridge University Press:  31 January 2011

Shan-Tung Tu
Affiliation:
Key Laboratory of Safety Science of Pressurized System, Ministry of Education (Mechanical Education), School of Mechanical Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China
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Abstract

We report on an approach for laser surface nitriding of Ti6Al4V alloy coupled with an applied stress field. A surprising finding was that, with increasing the applied stress levels, the decreased residual stress, the nitrogen concentration near the surface, and the surface microhardness of the nitrided layer were associated with the increased friction coefficient. Across the depth of the nitrided layer, the hardness, the elastic modulus, and the wear resistance (H/E) measured by nanoindentation decreased gradually and were ascribed to the gradient of nitrogen concentration in the melt zone.

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Articles
Copyright
Copyright © Materials Research Society 2010

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