Sensitivity analysis of nondestructive magnetic techniques for the restoration of stamped marks on low carbon steel
| Autor: | Gabriela R. Pereira, Clara Johanna Pacheco, Mariana Gaudencio Barbosa Lima, Maria Cecília de Souza Nóbrega |
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| Rok vydání: | 2020 |
| Předmět: |
lcsh:TN1-997
010302 applied physics Materials science Magnetic characteristic Carbon steel Acoustics Metals and Alloys 02 engineering and technology Magnetic particle inspection engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Surfaces Coatings and Films Biomaterials 0103 physical sciences Ceramics and Composites engineering Sensitivity (control systems) 0210 nano-technology Depth limit lcsh:Mining engineering. Metallurgy |
| Zdroj: | Journal of Materials Research and Technology, Vol 9, Iss 1, Pp 162-167 (2020) |
| ISSN: | 2238-7854 |
| DOI: | 10.1016/j.jmrt.2019.10.041 |
| Popis: | Restoration of obliterated stamped marks is a common investigative technique used in criminal investigation. Considering the evolution of the obliteration techniques used by criminals, a study of the feasibility of sensitive, effective, and nondestructive techniques is needed. This study aims to evaluate the performance and sensibility of two nondestructive techniques: magnetic particle restoration and magneto-optical imaging. To this end, steel samples from automobile chassis were analyzed. The samples were characterized in order to obtain information regarding material microstructure, magnetic characteristic, and hardness, followed by the restoration of stamp marks. Both magnetic particle restoration and magneto-optical imaging were capable of partially restoring the identification code obliterated by overstamping. In addition, nondestructive techniques showed a restoration depth limit of 260 µm below the cavity. Keywords: Restoration, Sensibility, Obliterated marks, Magneto-optic imaging, Magnetic particle |
| Databáze: | OpenAIRE |
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