ODS ferritic steels obtained from gas atomized powders through the STARS processing route: Reactive synthesis as an alternative to mechanical alloying
| Autor: | T. Leguey, Alexei Kuzmin, Pilar Fernández, Arturs Cintins, Wilfredo García Vargas, Jan Hoffmann, Juris Purans, Iñigo Iturriza, Vanessa de Castro, David Pazos, Andris Anspoks, N. Ordás |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Scanning electron microscope Materials Science (miscellaneous) Oxide chemistry.chemical_element 02 engineering and technology 01 natural sciences 010305 fluids & plasmas Nanoclusters chemistry.chemical_compound Radiation damage Fracture toughness X-ray photoelectron spectroscopy 0103 physical sciences NATURAL SCIENCES:Physics [Research Subject Categories] Yttria-stabilized zirconia Engineering & allied operations Metallurgy Yttrium 021001 nanoscience & nanotechnology Microstructure lcsh:TK9001-9401 Fusion reactors Nuclear Energy and Engineering chemistry lcsh:Nuclear engineering. Atomic power Oxide dispersion strengthened ferritic stainless steels (ODS FS) ddc:620 0210 nano-technology |
| Zdroj: | Nuclear materials and energy, 17, 1–8 Nuclear Materials and Energy, Vol 17, Iss, Pp 1-8 (2018) Nuclear Materials and Energy |
| ISSN: | 2352-1791 |
| Popis: | Authors acknowledge ALBA synchrotron (Spain) for the provision of beamtime on the beam line BL22-CLAESS (Proposal 2016081797). Transmission electron microscopy observations were accomplished at Centro Nacional de Microscopía Electrónica, CNME-UCM. This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Financial support from Basque Government through the ELKARTEK ACTIMAT 2016 project is also acknowledged. Oxide Dispersion Strengthened Ferritic Stainless Steels (ODS FS) are candidate materials for structural components in fusion reactors. Their ultrafine microstructure and the presence of a very stable dispersion of Y-Ti-O nanoclusters provide reasonable fracture toughness, high mechanical and creep strength, and resistance to radiation damage at the operation temperature, up to about 750 °C. An innovative route to produce ODS FS with composition Fe-14Cr-2W-0.3Ti-0.3Y2O3 (wt.%), named STARS (Surface Treatment of gas Atomized powder followed by Reactive Synthesis), is presented. This route avoids the mechanical alloying (MA) of the elemental or prealloyed powders with yttria to dissolve the yttrium in the ferritic matrix. In this study, starting powders containing Ti and Y are obtained by gas atomization at laboratory and industrial scale. Then, a metastable Cr- and Fe- rich oxide layer is formed on the surface of the powder particles. During consolidation by HIP the metastable oxide layer at Prior Particle Boundaries (PPBs) dissociates, the oxygen diffuses towards saturated solutions or metallic Ti- and Y-rich particles, and Y-Ti-O nano-oxides (mainly Y2TiO5) precipitate in the ferritic matrix. Detailed Microstructural characterization by X-ray Photoelectron Spectroscopy (XPS), X-ray Absorption Spectroscopy (XAS), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) of powders and consolidated materials is presented and correlated with mechanical behaviour. Euratom research and training programme 2014–2018 under grant agreement No 633053; Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART² |
| Databáze: | OpenAIRE |
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