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Surface imaging of metallic material fractures using optical coherence tomography (OPEN ACCESS)

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Hutiu Gh., Duma V. F.*, Demian D., Bradu A., and Podoleanu A. Gh.

Editorial: Applied Optics, 53(26), p.5912-5916, 2014.


We demonstrate the capability of optical coherence tomography (OCT) to perform topography of metallic surfaces after being subjected to ductile or brittle fracturing. Two steel samples, OL37 and OL 52, and an anti-friction Sn-Sb-Cu alloy were analyzed. Using an in house built swept source (SS) OCT system height profiles were generated for the surfaces of the two samples. Based on such profiles, it can be concluded that the first two samples were subjected to ductile fracture, while the third one was subjected to brittle fracture. The OCT potential in assessing the surface state of materials after fracture was evaluated by comparing OCT images with images generated using an established method for such investigations, Scanning Electron Microscopy (SEM). Analysis of cause of fracture is essential in damage of machinery parts during various accidents. Currently the analysis is performed using SEM, on samples removed from the metallic parts, while OCT would allow in situ imaging using mobile units. To the best of our knowledge, this is the first time when OCT capability to replace SEM is demonstrated. SEM is a more costly and time-consuming method in the investigation of surfaces of micro-structures of metallic materials.

Cuvinte cheie: Imaging systems, Instrumentation, measurement, and metrology, Materials, Optical coherence tomography, Three-dimensional image acquisition, Metrological instrumentation, Metals, Optical coherence tomography, Scanning microscopy