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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
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Official URL: http://dx.doi.org/10.1007/s11661-013-1938-x
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: |
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| 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 | ||||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC) | ||||||
| Grant number: | EP/H023429/1 (EPSRC) |
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