Ultrasonic attenuation and grain-size evaluation using electromagnetic acoustic resonance

Ogi, Hirotsugu; Hirao, Masahiko; Honda, Takashi

Journal of the Acoustical Society of America, 1995, 98(1), 458-464

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Identifier to cite or link to this item: https://hdl.handle.net/11094/84150

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Title
Ultrasonic attenuation and grain-size evaluation using electromagnetic acoustic resonance
Creator
NRID
1000090252626 1000090252626
researchmap permalink
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Scopus Author ID
35563683500 35563683500
ORCID
0000-0002-9602-5194 0000-0002-9602-5194
CreatorName
Ogi, Hirotsugu
NRID
1000080112027 1000080112027
CreatorName
Hirao, Masahiko
CreatorName
Honda, Takashi
Description
Hirotsugu Ogi, Masahiko Hirao, and Takashi Honda. Ultrasonic attenuation and grain-size evaluation using electromagnetic acoustic resonance. Journal of the Acoustical Society of America, 1995, 98(1), 458. https://doi.org/10.1121/1.413703.
Abstract
Electromagnetic acoustic resonance is applied for determining the frequency dependence of the ultrasonic attenuation and the average grain size of low-carbon steels. Use of a noncontacting electromagnetic acoustic transducer (EMAT) makes it possible to isolate the attenuation within the plate specimens. The method relies on the Lorentz force mechanism to couple the EMAT to the specimen surfaces and then eliminates the other losses, which may otherwise occur with the contacting piezoelectric transducers. The measurement is independent of the EMAT used, the specimen thickness, the surface condition, the lift-off, etc., and is stable because of the noncontacting nature. First, the resonant frequencies are measured, to the accuracy of 10 Hz, by sweeping the operating frequency and obtaining the amplitude spectrum over a band in the 0.520-MHz range. The ringing signals are excited and received by a shear wave EMAT and then processed with a superheterodyne receiver. Second, the attenuation coefficient as a function of the resonant frequency is determined. At each resonant frequency, the output signal rings down exponentially with time and the attenuation coefficient is obtained from the time constant by fitting an exponential decay to them. After correcting for the diffraction effect, the average grain size is obtained from the fourth-power term in the frequency dependence. The final results are favorably compared with the average of the three-dimensional grain-size distribution of steels.
Publisher
Acoustical Society of America
Source Title
Journal of the Acoustical Society of America
Volume (Issue)
98(1)
Page
458-464
Date of Issued
1995-07
Language
English
Handle URL
https://hdl.handle.net/11094/84150
PISSN
00014966
NCID
AA00253792
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1121/1.413703
Access Rights
open access
CopyRight
Copyright 1995 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article