Nanoscale analysis of ion irradiated ODS 14YWT ferritic alloy

In this work, the nanoscale microstructure of an advanced oxide dispersion strengthened (ODS) 14YWT ferritic alloy (SM13 heat) with nominal composition Fe–14Cr–3W-0.4Ti-0.3Y2O3 (wt. %) has been characterized by atom probe tomography (APT) before and after ion irradiation with 70 MeV Fe9+ ions at 450...

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Bibliographic Details
Published in:Journal of nuclear materials 2020-01, Vol.528 (C), p.151852, Article 151852
Main Authors: Auger, Maria A., Hoelzer, David T., Field, Kevin G., Moody, Michael P.
Format: Article
Language:English
Subjects:
14YWT
Atom probe tomography
Boundaries
Chromium
Cluster analysis
Clusters
Dispersion hardening alloys
Evolution
Grain boundaries
Ion irradiation
Irradiation
Mechanical properties
Microstructure
Nanoparticles
ODS alloys
Oxide dispersion strengthening
Tungsten
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Summary:In this work, the nanoscale microstructure of an advanced oxide dispersion strengthened (ODS) 14YWT ferritic alloy (SM13 heat) with nominal composition Fe–14Cr–3W-0.4Ti-0.3Y2O3 (wt. %) has been characterized by atom probe tomography (APT) before and after ion irradiation with 70 MeV Fe9+ ions at 450 °C to a total dose of 21 dpa. A detailed solute cluster analysis of APT data reveals that, in the manufacturing process, larger nanoparticles form in or close to the grain boundaries respective to those inside grains. The evolution of the nanoparticles after irradiation seems to be related to their location, as a higher increase in the number density and in the Y:Ti ratio is observed for the nanoparticles in or close to grain boundaries. APT analysis also shows Cr, W and C segregation to grain boundaries enhanced by the irradiation. A previous study of this same alloy before and after irradiation reports that the mechanical properties do not seem to be affected, but the microstructure was not investigated to confirm. The present work confirms little microstructural evolution after irradiation in this 14YWT alloy, indicating tolerance at the given irradiation conditions.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2019.151852