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

Hongtao Zhang, Michael J. Gorley, Kok Boon Chong, Michael E. Fitzpatrick, Steve G. Roberts, Patrick S. Grant

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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.
    Original languageEnglish
    Pages (from-to)769-773
    JournalJournal of Alloys and Compounds
    Volume582
    Issue number2014
    Early online date29 Aug 2013
    DOIs
    Publication statusPublished - 5 Jan 2014

    Bibliographical note

    This paper is not available on the repository.
    Funded by Engineering and Physical Sciences Research Council

    Keywords

    • Neutron diffraction
    • Mechanical alloying
    • Ferritic steels
    • Oxide-dispersion-strengthened (ODS) alloy
    • Precipitation

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