Ti and Cr nitride coating/steel adherence assessed by acoustic emission wavelet analysis

Wavelet Transform (WT) was applied to Acoustic Emission (AE) signals from scratch tests on stainless steel samples with Cr or Ti nitride coatings obtained by physical vapor deposition, in order to characterize the coating adherence failure mechanisms. The WT, employed to analize the essentially non-...

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Bibliographic Details
Published in:NDT & E international : independent nondestructive testing and evaluation 2005-06, Vol.38 (4), p.260-267
Main Authors: Piotrkowski, R., Gallego, A., Castro, E., García-Hernandez, M.T., Ruzzante, J.E.
Format: Article
Language:English
Subjects:
Acoustic emission
Acoustical measurements and instrumentation
Acoustics
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Materials science
Materials testing
Microfractures
Nitride coatings
Physics
Scratch test
Wavelet analysis
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Summary:Wavelet Transform (WT) was applied to Acoustic Emission (AE) signals from scratch tests on stainless steel samples with Cr or Ti nitride coatings obtained by physical vapor deposition, in order to characterize the coating adherence failure mechanisms. The WT, employed to analize the essentially non-stationary AE signals, was adequate to identify different stages of failure (transversal coating microfractures and coating/matrix debonding microfractures), which could be precisely delimited by a unique parameter.
ISSN:0963-8695
1879-1174
DOI:10.1016/j.ndteint.2004.09.002