The relation between AC permeability and dislocation density and grain size in pure iron

Issue title: Proceedings of the twelfth International Symposium on Interdisciplinary Electromagnetic, Mechanic and Biomedical Problems, ISEM Bad Gastein

Article type: Research Article

Authors: Kikuchi, Hiroaki^{a; *} | Henmi, Yuji^a | Liu, Tong^a | Ara, Katsuyuki^a | Kamada, Yasuhiro^a | Kobayashi, Satoru^a | Takahashi, Seiki^a

Affiliations: [a] NDE & SR-C, Faculty of Engineering, Iwate University, 4-3-5 Ueda, Morioka 020-8551, Japan

Correspondence: [*] Corresponding author. Tel.: +81 0 19 621 6890; Fax: 81 0 19 621 6890; E-mail: hkiku@iwate-u.ac.jp

Abstract: Magnetic properties of an iron-based steel derived from its major hysteresis loop are very sensitive to its microstructures and have been, therefore, used for nondestructive evaluation (NDE) of degradation in infrastructure made by ferromagnetic materials. The permeability obtained from small ac field excitation may be a more useful parameter for NDE of ferromagnetic materials than one obtained from a major hysteresis loop from the viewpoints of electricity consumption and real-time measurements. In this paper a relation between ac permeability, calculated from impedance of coil elements, and dislocation density or grain size of pure iron were clarified. A potential of NDE using ac permeability is also discussed.

Keywords: AC permeability, nondestructive evaluation (NDE), impedance, dislocation density, grain size

DOI: 10.3233/JAE-2007-891

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 341-346, 2007