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Assessment of industrial nitriding processes for fusion steel applications

Seitz, M.; Hoffmann, J.; Rieth, M.; Margraf, P.; Senn, R.; Klimenkov, M.; Lindau, R.; Baumgärtner, S.; Jäntsch, U.; Franke, P.; Möslang, A.

The 9Cr steels EUROFER and F82H-mod are the candidate materials for future fusion reactors. The extension of the operation limits including temperature, strength and toughness are still the scope of ongoing research. In a pulsed reactor operation, fatigue lifetime is one of the major properties for the steels. While the oxide dispersion strengthened EUROFER-ODS variant showed significant improvements in this area, the production costs and availability of large quantities of materials drastically limits its applications.

In the present study, different surface nitriding treatments of EUROFER972 have been performed and the impact on microstructure, dynamic fracture toughness and high temperature fatigue has been analysed. Four different states of EUROFER including different heat treatments, nitriding of the surface and the ODS variant are tested and compared in this work.

Low cycle fatigue tests show the improvements after certain treatments. Charpy impact tests and microstructural investigation by scanning electron microscopy and analytical transmission electron microscopy are also performed to compare the materials against the reference (EUROFER97).
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Verlagsausgabe §
DOI: 10.5445/IR/1000071709
Veröffentlicht am 18.12.2017
DOI: 10.1016/j.nme.2017.05.015
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2017
Sprache Englisch
Identifikator ISSN: 2352-1791
KITopen-ID: 1000071709
HGF-Programm 31.03.06 (POF III, LK 01)
Erschienen in Nuclear materials and energy
Band 13
Seiten 90-98
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 30.06.2017
Schlagwörter EUROFER; Nitriding; ODS-EUROFER; Fatigue; Transmission electron microscope (TEM); Charpy impact tests (DBTT)
Nachgewiesen in Scopus
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