Abstract:
Since the working tool surface is often subjected to severe conditions during manufacturing, its surface roughness must be changed from original flat or buffed plane to curved or dimple one. Furthermore, the surface layer material is deteriorated and becomes different from the matrix microstructure; otherwise, significant residual stresses are left in materials. Our developed acoustic spectra microscopy is applied to quantitative nondestructive evaluation on these changes of surface material structure during process. Both the heat-treated mild steels and the TiN-coated stainless steels are employed as a model Materials to investigate the sensitivity of measured acoustic signals to artificial change of roughness and the surface wrought layer thickness. From the measured dispersion curves of surface velocity, surface condition is found to be quantitatively recognized.
(Ref. SXVIII-038-97)
Source: NDE of Ceramics '97 May 4-7, Symposium on Nondestructive Evaluation of Ceramics
at the American Ceramic Society 99th Annual Meeting, Cincinnati, Ohio.
Buying the Symposium Proceedings from the American Ceramic Society.
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