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Microstructure and precipitation behavior of advanced RAFM steels for high-temperature applications on fusion reactors

Fernández, P.; Hoffmann, J. 1; Rieth, M. ORCID iD icon 1; Gómez-Herrero, A.
1 Karlsruher Institut für Technologie (KIT)


The composition of new eigth 9% Cr reduced activation ferritic/martensitioc steels (RAFMs) has been finely tuned in order to increase the amount of fine MX precipitates and reduce coarse M$_{23}$C$_{6}$ carbides through the application of thermomechanical treatments. The microstructural investigations by TEM/STEM and EELS have shown M$_{23}$C$_{6}$, M$_{2}$X (Cr$_{2}$N), and MX (Ta, V, and Ti-rich) precipitates after tempering at 750 °C/2 h. Higher N contens (0.04–0.03 wt%) seems to favored M$_{2}$X precipitation over MX with V contents round 0.2 wt%. MX-Ti rich presents sizes larger than MX (Ta or V rich). EELS anlysis have shown that the MX (Ta, V and Ti rich) precipitated after tempering at 750 °C/2 h are mainly carbo-nitrides. Composition, size, number density and carbon and nitrogen content on MX and M$_{2}$X is discussed in terms of the composition of each Alloy.

Verlagsausgabe §
DOI: 10.5445/IR/1000137575
Veröffentlicht am 24.09.2021
DOI: 10.1016/j.matchar.2021.111443
Zitationen: 8
Web of Science
Zitationen: 7
Zitationen: 7
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Institut für Angewandte Materialien – Keramische Werkstoffe und Technologien (IAM-KWT1)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 10.2021
Sprache Englisch
Identifikator ISSN: 1044-5803, 1873-4189
KITopen-ID: 1000137575
HGF-Programm 31.13.05 (POF IV, LK 01) Neutron-Resistant Structural Materials
Erschienen in Materials Characterization
Verlag Elsevier
Band 180
Seiten Art.-Nr.: 111443
Vorab online veröffentlicht am 08.09.2021
Nachgewiesen in Web of Science
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