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Magnetic Domain Wall-Microstructure Interactions In Low-Carbon Steel

Published online by Cambridge University Press:  02 July 2020

V. Radmilovic  and
Kannan.M. Krishnan
V. Radmilovic
Affiliation:
National Center for Electron Microscopy, LBNL, University of California, Berkeley department Of Physical Metallurgy, University of Belgrade, Belgrade, Yugoslavia
Kannan.M. Krishnan
Affiliation:
National Center for Electron Microscopy, LBNL, University of California, Berkeley
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Extract

Nondestructive evaluation of steels is both an important engineering need and a scientific challenge. Recent advances include a SQUID imaging technique that is capable of detecting small changes in stray fields at reasonable spatial resolution. The technique is motivated by the fact that the stray fields, determined by the underlying domain configurations in the material, would provide insight into the microstructure including defects, provided the interactions between the microstructure and the domain walls can be well understood.Initial work is being carried out on 1018 low-carbon steels, plastically deformed in a controlled fashion, with the goal of correlating SQUID images with magnetic domain images measured by Lorentz microscopy in a TEM.

Experiments were carried out in a CM200 FEG TEM using the OL field in low-mag (LM) mode, based on a procedure described by Verbist et al [1] and Daykin et al [2].

Type
Magnetic Imaging And Its Application To Materials
Information
Microscopy and Microanalysis , Volume 5 , Issue S2: Proceedings: Microscopy & Microanalysis '99, Microscopy Society of America 57th Annual Meeting, Microbeam Analysis Society 33rd Annual Meeting, Portland, Oregon August 1-5, 1999 , August 1999 , pp. 18 - 19
Copyright
Copyright © Microscopy Society of America

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References

1.Verbist, K., Nelson, E.C., Anthony, T.C., Brug, J.A., and Krishnan, K.M., Electron Microscopy 1998, ICEM 14, Cancun, Mexico, p. 503.Google Scholar
2.Doykin, A.C., Petford-Long, A.K., Ultramicroscopy, 58 (1995) 365.CrossRefGoogle Scholar
3.This work was supported by the Director Office of Energy Research, Office of Basic Energy Sciences, materials Science Division of the U. S. Department of Energy under contract No. DE-AC03-76SF00098. We would also like to acknowledge Chris Nelson for technical assistance on the CM200 and J. Clarke and J. W. Morris for helpful discussions.Google Scholar