Chemical and structural evolution of nano-oxides from mechanical alloying to consolidated ferritic oxide dispersion strengthened steel

Spartacus G, Malaplate J, De Geuser F, Mouton I, Sornin D, Perez M, Guillou R, Arnal B, Rouesne E & Deschamps A
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Spartacus, G., Malaplate, J., De Geuser, F., Mouton, I., Sornin, D., Perez, M., … Deschamps, A. (2022). Chemical and structural evolution of nano-oxides from mechanical alloying to consolidated ferritic oxide dispersion strengthened steel. Acta Materialia, 233, 117992 (17 pp.). https://doi.org/10.1016/j.actamat.2022.117992
https://www.dora.lib4ri.ch/psi/islandora/object/psi:43371

Ferritic Oxides Dispersion Strengthened (ODS) steels are of great interest for nuclear fission and fusion power plants. The nano-oxides embedded into the matrix provide the main contribution to the ODS steel strength. Understanding of the precipitation mechanism of ODS steels is thus critical for optimizing the fabrication process, involving Mechanical Alloying (MA) of Fe-14Cr, Y2O3 and TiH2 powders. In this study, results from small-angle X-ray and neutron scattering, atom probe tomography and electron microscopy have been combined to investigate the nano-oxides evolution throughout the whole consolidation thermal treatment until 1100 °C. After MA clusters are observed, composed of Y, O and Ti. During heating these clusters grow and new ones nucleate, together with a sequential enrichment in Ti (from as-MA to 700 °C) and Y (between 900 and 1100 °C). A small quantity of Al is also found in the nano-oxides between 700 and 1100 °C. At 1100 °C the nano-oxides are found to be mainly Y2Ti2O7 and subsequently progressively transform to Y2TiO5 during isothermal holding. Nano-oxides display however an unchanged extremely low coarsening rate, demonstrating the outstanding stability of both Y2Ti2O7 and Y2TiO5 at 1100 °C.

Details
Publication Type

Journal Article

Title

Chemical and structural evolution of nano-oxides from mechanical alloying to consolidated ferritic oxide dispersion strengthened steel

Author(s)

Spartacus, Gabriel (CEA centre de Saclay, Université Paris-Saclay, CEA, Service de Recherches Métallurgiques Appliquées, Gif-sur-Yvette Cedex 91191,)

Malaplate, Joël (CEA centre de Saclay, Université Paris-Saclay, CEA, Service de Recherches Métallurgiques Appliquées, Gif-sur-Yvette Cedex 91191,)

De Geuser, Frédéric (Univ. Grenoble Alpes, CNRS, Grenoble INP, SIMAP, F-38000 Grenoble, France)

Mouton, Isabelle (CEA centre de Saclay, Université Paris-Saclay, CEA, Service de Recherches Métallurgiques Appliquées, Gif-sur-Yvette Cedex 91191,)

Sornin, Denis (CEA centre de Saclay, Université Paris-Saclay, CEA, Service de Recherches Métallurgiques Appliquées, Gif-sur-Yvette Cedex 91191,)

Perez, Michel (Univ. Lyon, INSA-Lyon, UCBL, MATEIS UMR CNRS 5510, F69621 Villeurbanne, France)

Guillou, Raphaëlle (CEA centre de Saclay, Université Paris-Saclay, CEA, Service de Recherches Métallurgiques Appliquées, Gif-sur-Yvette Cedex 91191,)

Arnal, Benoit (CEA centre de Saclay, Université Paris-Saclay, CEA, Service de Recherches Métallurgiques Appliquées, Gif-sur-Yvette Cedex 91191,)

Rouesne, Elodie (CEA centre de Saclay, Université Paris-Saclay, CEA, Service de Recherches Métallurgiques Appliquées, Gif-sur-Yvette Cedex 91191,)

Deschamps, Alexis (Univ. Grenoble Alpes, CNRS, Grenoble INP, SIMAP, F-38000 Grenoble, France)

Journal

Acta Materialia

Volume

233

Start Page

117992 (17 pp.)

Publication Year

2022

Peer Review

Yes

Facility

SLS

Beamline

cSAXS

DUO Proposal ID

20191284

Collection

External Publications