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An in situ powder neutron diffraction study of nano-precipitate formation during processing of oxide-dispersion-strengthened ferritic steels

Zhang, Hongtao; Gorley, Michael J.; Chong, Kok Boon; Fitzpatrick, Michael E.; Roberts, Steve G. and Grant, Patrick S. (2014). An in situ powder neutron diffraction study of nano-precipitate formation during processing of oxide-dispersion-strengthened ferritic steels. Journal of Alloys and Compounds, 582 pp. 769–773.

DOI (Digital Object Identifier) Link: https://doi.org/10.1016/j.jallcom.2013.08.069
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Abstract

The evolution of phases in a Fe–14Cr–10Y2O3 (wt%) oxide-dispersion-strengthened ferritic steel during mechanical alloying (MA) and subsequent annealing was studied by high resolution powder neutron diffraction, with emphasis on the kinetics of oxide-based nano-precipitate formation. Y2O3 particles were completely dissolved into the ferritic matrix during MA. The formation of nano-precipitates was then observed by in situ thermo-diffraction experiments during annealing of as-milled powder above 900 °C, supported by scanning electron microscopy. This revealed nano-precipitate coarsening with increasing annealing temperature. Powder microhardness was measured at various processing stages, and hardness changes are discussed in terms of the measured phase fractions, crystallite size and lattice strain at different temperatures and times.

Item Type: Journal Item
Copyright Holders: 2013 Elsevier B.V.
ISSN: 1873-4669
Keywords: neutron diffraction; mechanical alloying; ferritic steels; oxide-dispersion-strengthened (ODS) alloy; precipitation
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM)
Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Item ID: 38565
Depositing User: Michael E. Fitzpatrick
Date Deposited: 26 Sep 2013 08:40
Last Modified: 02 Nov 2017 15:06
URI: http://oro.open.ac.uk/id/eprint/38565
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