Pulsed Eddy Current Testing of Thermally Aged and Cold Rolled Fe-Cu Alloys
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.
pulsed eddy current material ageing monitoring health management.
Gui Yuntian Song Ding Maxim Morozov Seiki Takahashi
School of Automation Engineering,Nanjing University of Aeronautics and Astronantics (NUAA),China;Sch School of Automation Engineering,Nanjing University of Aeronautics and Astronantics (NUAA),China School of Electrical,Electronic and Computer Engineering,Newcastle University Newcastle upon Tyne,NE NDE&SRC IWATE University,Japan
国际会议
2011 10th International Conference on Electronic Measurement & Instruments(第十届电子测量与仪器国际会议 ICEMI2011)
成都
英文
1110-1116
2011-08-16（万方平台首次上网日期，不代表论文的发表时间）