期刊
ACTA MATERIALIA
卷 145, 期 -, 页码 84-96出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2017.11.032
关键词
Microalloyed steel; Precipitation; Small angle scattering; Transmission electron microscopy
资金
- EPSRC [EP/L018705/1, EP/L018632/1, EP/M009688/1]
- Engineering and Physical Sciences Research Council [1443610, EP/L018705/1, EP/L018632/1, EP/M009688/1, EP/I02249X/1] Funding Source: researchfish
- EPSRC [EP/I02249X/1, EP/M009688/1, EP/L018705/1, EP/L018632/1] Funding Source: UKRI
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 degrees 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 x 10(21) to 5 x 10(20) 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. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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