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

Mariana G.B. Lima | Zendy; Clara Johanna Pacheco | Zendy; Maria C.S. Nóbrega | Zendy; Gabriela Ribeiro Pereira | Zendy

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

Author(s) -

Mariana G.B. Lima,

Clara Johanna Pacheco,

Maria C.S. Nóbrega,

Gabriela Ribeiro Pereira

Publication year - 2019

Publication title -

journal of materials research and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.832

H-Index - 44

eISSN - 2214-0697

pISSN - 2238-7854

DOI - 10.1016/j.jmrt.2019.10.041

Subject(s) - nondestructive testing , materials science , sensitivity (control systems) , microstructure , optics , acoustics , composite material , engineering , electronic engineering , physics , quantum mechanics

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.

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