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The effect of micro-segregation on the quantification of microstructural parameters in Grade 91 steel
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Jabar, Sharhid, Siefert, John A., Strangwood, Martin and West, Geoffrey D. (2021) The effect of micro-segregation on the quantification of microstructural parameters in Grade 91 steel. Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science, 52 . pp. 426-437. doi:10.1007/s11661-020-06062-y ISSN 1073-5623.
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Official URL: https://doi.org/10.1007/s11661-020-06062-y
Abstract
The quantification of key microstructural parameters as a function of aging or creep exposure time is commonplace in the assessment of 9Cr Creep Strength Enhanced Ferritic (CSEF) power-plant steels. In these studies, the sample is either assumed chemically homogenous at the micro-scale or that a material average will be achieved by collecting enough images at random locations. In this paper, the micro-scale chemical homogeneity of two ex-service boiler components, a pipe and a forging, are quantitatively assessed using high sensitivity chemical mapping from ยต-XRF. The compositional variation was as expected most pronounced in the larger elements Mo and Nb, where a > 20 pct difference in composition was present between positively and negatively segregated areas. The effect of this micro-segregation on local variations in Laves phase particle characteristics was investigated using SEM images. This showed a factor of two difference in the number of particles and the area coverage between positively and negatively Mo-segregated regions. This result was consistent with the thermodynamic equilibrium predictions of the phase content based on the observed level of segregation.
Item Type: | Journal Article | ||||||||
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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 -- Creep, Metals -- Effect of high temperatures on, Steel -- Testing, Power-plants -- Materials | ||||||||
Journal or Publication Title: | Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science | ||||||||
Publisher: | Springer New York LLC | ||||||||
ISSN: | 1073-5623 | ||||||||
Official Date: | January 2021 | ||||||||
Dates: |
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Volume: | 52 | ||||||||
Page Range: | pp. 426-437 | ||||||||
DOI: | 10.1007/s11661-020-06062-y | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||
Date of first compliant deposit: | 9 November 2020 | ||||||||
Date of first compliant Open Access: | 18 November 2020 | ||||||||
RIOXX Funder/Project Grant: |
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