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Investigating nano-precipitation in a V-containing HSLA steel using small angle neutron scattering

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Wang, Y. Q., Clark, Samuel, Janik, Vit, Heenan, R. K., Venero, D. Alba, Yan, K., McCartney, D. G., Sridhar, S. and Lee, P. D. (2018) Investigating nano-precipitation in a V-containing HSLA steel using small angle neutron scattering. Acta Materialia, 145 . pp. 84-96. doi:10.1016/j.actamat.2017.11.032

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Official URL: https://doi.org/10.1016/j.actamat.2017.11.032

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Abstract

Interphase precipitation (IPP) of nanoscale carbides in a vanadium-containing high-strength low-alloy steel has been investigated. Small angle neutron scattering (SANS) and transmission electron microscopy (TEM) were employed to characterize the precipitates and their size distributions in Fe-0.047C-0.2V-1.6Mn (in wt.%) alloy samples which had been austenitized, isothermally transformed at 700 °C for between 3 and 600 min and water quenched. TEM confirms that, following heat treatment, rows of vanadium-containing nanoscale interphase precipitates were present. Model-independent analysis of the nuclear SANS signal and model fitting calculations, using oblate spheroid and disc-shapes, were performed. The major axis diameter increased from 18 nm after 3 min to 35 nm after 600 min. Precipitate volume percent increased from 0.09 to 0.22 vol% over the same period and number density fell from 2 × 1021 to 5 × 1020 m−3. A limited number of measurements of precipitate maximum diameters from TEM images showed the mean value increased from 8 nm after 5 min to 28 nm after 600 min which is in reasonable agreement with the SANS data.

Item Type: Journal Article
Subjects: T Technology > TN Mining engineering. Metallurgy
Divisions: Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Steel alloys, Microalloying, Small-angle scattering, Transmission electron microscopy
Journal or Publication Title: Acta Materialia
Publisher: Pergamon-Elsevier Science Ltd
ISSN: 1359-6454
Official Date: 15 February 2018
Dates:
DateEvent
15 February 2018Published
1 December 2017Available
19 November 2017Accepted
Volume: 145
Page Range: pp. 84-96
DOI: 10.1016/j.actamat.2017.11.032
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/L018705/1 Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/L018632/1Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/M009688/1Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
RB1520193Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
RB1620206Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271

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