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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, ClaireL and Peyton, Anthony 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, 44 (13). pp. 5897-5909. doi:10.1007/s11661-013-1938-x

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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: Q Science > QC Physics
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TN Mining engineering. Metallurgy
Divisions: Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
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
7 July 2013Accepted
4 February 2013Submitted
Volume: 44
Number: 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
Funder: Engineering and Physical Sciences Research Council (EPSRC)
Grant number: EP/H023429/1

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