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

doi:10.1016/j.jallcom.2013.08.069

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

Research output: Contribution to journal › Article › peer-review

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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 language	English
Pages (from-to)	769-773
Journal	Journal of Alloys and Compounds
Volume	582
Issue number	2014
Early online date	29 Aug 2013
DOIs	https://doi.org/10.1016/j.jallcom.2013.08.069
Publication status	Published - 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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10.1016/j.jallcom.2013.08.069

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@article{030aa0423ac34498b48fc11e8494b173,

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

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.",

keywords = "Neutron diffraction, Mechanical alloying, Ferritic steels, Oxide-dispersion-strengthened (ODS) alloy, Precipitation",

author = "Hongtao Zhang and Gorley, {Michael J.} and {Boon Chong}, Kok and Fitzpatrick, {Michael E.} and Roberts, {Steve G.} and Grant, {Patrick S.}",

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

year = "2014",

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doi = "10.1016/j.jallcom.2013.08.069",

language = "English",

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journal = "Journal of Alloys and Compounds",

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T1 - An in situ powder neutron diffraction study of nano-precipitate formation during processing of oxide-dispersion-strengthened ferritic steels

AU - Zhang, Hongtao

AU - Gorley, Michael J.

AU - Boon Chong, Kok

AU - Fitzpatrick, Michael E.

AU - Roberts, Steve G.

AU - Grant, Patrick S.

N1 - This paper is not available on the repository. Funded by Engineering and Physical Sciences Research Council

PY - 2014/1/5

Y1 - 2014/1/5

N2 - 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.

AB - 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.

KW - Neutron diffraction

KW - Mechanical alloying

KW - Ferritic steels

KW - Oxide-dispersion-strengthened (ODS) alloy

KW - Precipitation

U2 - 10.1016/j.jallcom.2013.08.069

DO - 10.1016/j.jallcom.2013.08.069

M3 - Article

SN - 0925-8388

SN - 1873-4669

VL - 582

SP - 769

EP - 773

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

IS - 2014

ER -

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

Abstract

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Keywords

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