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Mechanism of improvement of TiN-coated tool life by nitrogen implantation

Published online by Cambridge University Press:  31 January 2011

S. J. Bull ,
Yu. P. Sharkeev ,
S. V. Fortuna ,
I. A. Shulepov  and
A. J. Perry
S. J. Bull
Affiliation:
Department of Mechanical, Materials and Manufacturing Engineering, University of Newcastle, Newcastle-upon-Tyne, NE1 7RU, United Kingdom
Yu. P. Sharkeev
Affiliation:
Russian Academy of Sciences, Institute for Strength Physics and Materials Science, Tomsk 634021, Russia
S. V. Fortuna
Affiliation:
Tomsk State University, Department of Architecture and Building, Tomsk 634003, Russia
I. A. Shulepov
Affiliation:
Nuclear Physics Institute, Tomsk Polytechnic University, Tomsk 634050, Russia
A. J. Perry
Affiliation:
A.I.M.S. Consulting, 9470, Buchs SG, Switzerland
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Abstract

The life of TiN-coated tools can be improved by a post-coating ion implantation treatment, but the mechanism by which this occurs is still not clear. Nitrogen implantation of both physical-vapor-deposited TiN and CVD TiN leads to surface softening as the dose increases, which has been attributed to amorphization. In this study a combination of transmission electron microscopy and atomic force microscopy was used to characterize the microstructure of implanted TiN coatings on cemented carbide for comparison with mechanical property measurements (nanoindentation, residual stress, etc.), made on the same samples. Ion implantation leads to a slight reduction in the grain size of the TiN in the implanted zone, but there is no evidence for amorphization. Surface softening is observed for physical-vapor-deposited TiN, but this is probably due to a combination of changes in surface composition and the presence of a layer of bubbles generated by the very high implantation doses used.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 11 , November 2001 , pp. 3293 - 3303
Copyright
Copyright © Materials Research Society 2001

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