Sensitivity analysis of nondestructive magnetic techniques for the restoration of stamped marks on low carbon steel

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 eva...

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Bibliographic Details
Published in:	Journal of materials research and technology Vol. 9; no. 1; pp. 162 - 167
Main Authors:	Lima, Mariana G.B., Pacheco, Clara J., Nóbrega, Maria C.S., Pereira, Gabriela R.
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 01-01-2020 Elsevier
Subjects:	Magnetic particle Magneto-optic imaging Obliterated marks Restoration Sensibility Magnetic particle Sensibility Restoration Obliterated marks Magneto-optic imaging
Online Access:	Get full text
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Summary:	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.
ISSN:	2238-7854
DOI:	10.1016/j.jmrt.2019.10.041