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Expanding the operation window of RAFM steels by optimized chemical compositions and heat treatments

Hoffmann, Jan; Rieth, Michael; Baumgärtner, Siegfried; Klimenkov, Michael; Dürrschnabel, Michael

Abstract:
9%-Cr reduced activation steels are the designated structural materials for future fusion reactors. The improvement of this class of alloys, especially the extension of the operation limits, is the present scope of the EUROfusion materials project for advanced steels. Within this programme, new alloys are designed and fabricated to overcome some of the limitations of EUROFER97.
In the present study, three 9%-Cr alloys with some variations in the chemical compositions are compared to standard EUROFER97 batches. The main focus lies in the possible extension of the operation window to both higher and lower temperatures.
This is achieved by a variation of the amount of the minor alloying elements which form precipitates and secondary phases. Combining the modified chemical compositions with special heat treatments tailored for the specific alloys leads to a refined distribution of the carbide and nitride phases. Moderate variations in the alloy compositions open the possibility for extended temperature windows for these unconventional heat treatments (e.g. higher tempering temperature). Thermo-mechanical treatments showed the predic ... mehr


Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Vortrag
Jahr 2018
Sprache Englisch
Identifikator KITopen ID: 1000084333
HGF-Programm 31.03.06; LK 01
Erschienen in 8th Forum on New Materials, Perugia, I, June 10-14, 2018
Schlagworte EBSD; STEEL; FUSION
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