NDLI: Pulsed eddy current testing of thermally aged and cold rolled Fe-Cu alloys

Content Provider	IEEE Xplore Digital Library
Author	Gui Yuntian Song Ding Morozov, M. Takahashi, S.
Copyright Year	2011
Description	Author affiliation: School of Automation Engineering, Nanjing University of Aeronautics and Astronantics (NUAA), China (Gui Yuntian; Song Ding) \|\| School of Electrical, Electronic and Computer Engineering, Newcastle University Newcastle upon Tyne, NE1 7RU, UK (Morozov, M.) \|\| NDE&SRC IWATE University, Japan (Takahashi, S.)
Abstract	In this work Fe-1wt%Cu alloy samples exposed to thermal aging and cold-rolling were studied as an attempt to emulate material degradation in neutron irradiated nuclear reactor pressure vessel. The cold rolling was tested by pulsed eddy currents (PEC) using a directional probe which was rotated in the sample plane. Normalised PEC signals represented by typical “figures of eight” on the polar plot, showed very strong anisotropy which has a monotonic dependence on the cold work amount. Since the normalised PEC signals represent response due to electrical conductivity and do discard the ferromagnetic effect, it is concluded that the change is due to anisotropic magnetoresistivy of the rolled steel. The normalised difference PEC responses have been found to be described by quadratic dependence of cosine of in-plane angle shifted by an angle which is believed to correspond to slip planes of dislocations induced by rolling. The technique advantageously combines effects of rolling on electrical conductivity and magnetic permeability and does not require referencing to an untreated standard, which is important for future material and device health management.
Starting Page	10
Ending Page	16
File Size	224426
Page Count	7
File Format	PDF
ISBN	9781424481583
e-ISBN	9781424481613
DOI	10.1109/ICEMI.2011.6037936
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-08-16
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	pulsed eddy current material ageing monitoring Metals Materials Aging Conductivity Magnetic hysteresis Permeability Eddy currents health management
Content Type	Text
Resource Type	Article

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