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Magnetic evaluation of microstructure changes in 9Cr-1Mo and 2.25Cr-1Mo steels using electromagnetic sensors

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Liu, Jun, Strangwood, Martin, Davis, Claire and Peyton, A. J. (2013) Magnetic evaluation of microstructure changes in 9Cr-1Mo and 2.25Cr-1Mo steels using electromagnetic sensors. Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science, Volume 44 (Number 13). pp. 5897-5909. doi:10.1007/s11661-013-1938-x ISSN 1073-5623.

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Official URL: http://dx.doi.org/10.1007/s11661-013-1938-x

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Abstract

This paper presents results from a multi-frequency electromagnetic sensor used to evaluate the microstructural changes in 9Cr-1Mo and 2.25Cr-1Mo power generation steels after tempering and elevated temperature service exposure. Electromagnetic sensors detect microstructural changes in steels due to changes in the relative permeability and resistivity. It was found that the low frequency inductance value is particularly sensitive to the different relative permeability values of both steels in the different microstructural conditions. The changes in relative permeability have been quantitatively correlated with the microstructural changes due to tempering and long-term thermal exposure, in particular to changes in martensitic/bainitic lath size and number density of carbide precipitates that determine the mean free path to reversible domain wall motion. The role of these microstructural features on pinning of magnetic domain wall motion is discussed.

Item Type: Journal Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Steel, Heat resistant -- Measurement, Steel -- Electric properties -- Measurement
Journal or Publication Title: Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science
Publisher: Springer New York LLC
ISSN: 1073-5623
Official Date: December 2013
Dates:
DateEvent
December 2013Published
13 August 2013Available
Volume: Volume 44
Number: Number 13
Number of Pages: 13
Page Range: pp. 5897-5909
DOI: 10.1007/s11661-013-1938-x
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 29 December 2015
Date of first compliant Open Access: 29 December 2015
Funder: Engineering and Physical Sciences Research Council (EPSRC)
Grant number: EP/H023429/1 (EPSRC)

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