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

Wang, YQ; Clark, SJ; Janik, V; Heenan, RK; Venero, DA; Yan, K; McCartney, DG; ... Lee, PD; + view all (2017) Investigating nano-precipitation in a V-containing HSLA steel using small angle neutron scattering. Acta Materialia , 145 pp. 84-96. 10.1016/j.actamat.2017.11.032. Green open access

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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.

Type: Article
Title: Investigating nano-precipitation in a V-containing HSLA steel using small angle neutron scattering
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.actamat.2017.11.032
Publisher version: https://doi.org/10.1016/j.actamat.2017.11.032
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Technology, Materials Science, Multidisciplinary, Metallurgy & Metallurgical Engineering, Materials Science, Microalloyed steel, Precipitation, Small angle scattering, Transmission electron microscopy, NANOMETER-SIZED CARBIDES, LOW-CARBON STEELS, MO MICROALLOYED STEELS, DUAL-PHASE STEELS, LOW-ALLOY STEELS, INTERPHASE PRECIPITATION, FERRITE TRANSFORMATION, TENSILE BEHAVIOR, COOLING RATE, SHEET STEEL
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10049190
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