NDLI: Measurement of Barkhausen emission and magnetoacoustic emission from a fractured steel bar

Content Provider	IEEE Xplore Digital Library
Author	Ng, D.H.L. Yu, C.C. Li, A.S.K. Lo, C.C.H.
Copyright Year	1965
Abstract	Barkhausen emission (BE) and magnetoacoustic emission (MAE) measurements have been made on a fractured steel bar. The MAE profile shows a large initial peak and a small final peak, whereas the BE profile contains an initial peak and a large central peak. These observation suggest that the process of domain nucleation involves the enlargement of residual domains that surround the defects, and is a result of the unpinning of the trapped domain walls. In the maximum field, the residual domains confined by the walls are not completely annihilated due to the strong demagnetizing field surrounding the defects, causing the final BE and MAE peaks to be small. Also, in the low field region of the BE profile, the large central peak indicates that the elongated grains have enhanced the motion of the 180/spl deg/ walls. After the bar has been annealed, we found that (i) the differences in magnitude between the initial and final peaks of both BE and MAE profiles are narrowed because of the fewer defects, and (ii) the overall BE and MAE signals are reduced as a result of the coarsening of ferrite and cementite grains.
Sponsorship	IEEE Magnetics Society
Starting Page	3394
Ending Page	3396
Page Count	3
File Size	555200
File Format	PDF
ISSN	00189464
Volume Number	31
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Steel Magnetic flux Position measurement Magnetostriction Annealing Coils Magnetic domain walls Magnetic domains Residual stresses Microstructure
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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