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

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posted on 08.06.2015 by Hongtao Zhang, Michael J. Gorley, Kok Boon Chong, Michael E. Fitzpatrick, Steve G. Roberts, Patrick S. Grant
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 nanoprecipitate formation. Y2O3 particles were almost 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 900oC, 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.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

Journal of Alloys and Compounds

Volume

582

Pages

769 - 773

Citation

ZHANG, H. ... et al, 2013. 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

Publisher

© Elsevier

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2013

Notes

This paper was accepted for publication in the Journal of Alloys and Compounds. The final published version is available at: http://dx.doi.org/10.1016/j.jallcom.2013.08.069

ISSN

0925-8388

eISSN

1873-4669

Language

en

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