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Mechanical Properties of Spark Plasma Sintered Fe-Cr Compacts Strengthened by Nanodispersed Yttria Particles

Mechanische Eigenschaften von Yttriumoxid-verstärkten Fe-Cr-Legierungen nach der Konsolidierung durch Spark-Plasma-Sintern
Peter Franke, Cornelia Heintze, Frank Bergner and Thomas Weißgärber
From the journal Materials Testing

Abstract

Oxide dispersion strengthening of high-Cr steels is a well-recognized way to extend the application window including nuclear applications for this class of materials. The experimental investigation of model alloys of less complexity is important in order to separate individual influence factors and to understand the irradiation behaviour. The present work is devoted to the mechanical properties of ODS Fe-9wt%Cr alloys produced by means of spark plasma sintering. The range of material conditions covers contents of nanodispersed yttria of 0 (reference), 0.3 wt%, and 0.6 wt% as well as variations of the milling time. Results obtained for the density, elastic properties, hardness, tensile behaviour, and brittle-ductile transition are reported, and the effect of ODS content and PM process parameters is discussed.

Kurzfassung

Oxiddispersionsverstärkung von Chromstählen stellt bekanntermaßen einen Weg zur Eigenschaftsverbesserung und zur Erweiterung des Anwendungsspektrums dieser Werkstoffgruppe, speziell auch für kerntechnische Anwendungen, dar. Die experimentelle Untersuchung von einfacheren Modelllegierungen ist hilfreich, um die Wirkungen unterschiedlicher Einflussfaktoren zu trennen und das Bestrahlungsverhalten besser zu verstehen. Gegenstand der Arbeit sind die mechanischen Eigenschaften von Spark-Plasma- gesinterten ODS-Fe-Cr-Legierungen mit 9 Masse-% Cr und 0, 0,3 bzw. 0,6 Masse-% Yttriumoxid. Die Ergebnisse von Dichtebestimmungen, Messungen der elastischen Eigenschaften, Härteprüfungen, Zug- und Kerbschlagbiegeversuchen werden vorgestellt. Im Mittelpunkt der Diskussion stehen die Einflüsse des Yttriumoxidanteils und der Prozessparameter.


Dipl.-Ing. Peter Franke, born 1982, studied Materials Technology at TU Bergakademie Freiberg. In 2009 he finished his diploma work on ODS-Fe-Cr in the framework of a collaboration between the Fraunhofer Institute for Manufacturing and Advanced Materials (IFAM), Branch Lab Powder Metallurgy and Composite Materials, Dresden, and Forschungszentrum Dresden-Rossendorf. He is now PhD student at TU Dresden.

Dipl.-Ing. Cornelia Heintze, born 1983, studied Mechanical Engineering at TU Dresden and specialized in Nuclear Engineering. In 2006 she finished her diploma work on the application of steels in nuclear technology. Her present PhD work at Forschungszentrum Dresden-Rossendorf, Institute of Safety Research, is focussed on nanoindentation applied to ion-irradiated Cr-steels.

Dr. rer. nat. et Dr.-Ing. habil. Frank Bergner, born 1959, studied Physics in Warsaw and Dresden. He worket at the Zentralinstitut für Kernforschung Rossendorf (1983–1991) and the TU Dresden (1992–2004). The fields of interest included ultrasonic testing, fracture mechanics, and fatigue crack growth. Since 2004 he has been with the Forschungszentrum Dresden-Rossendorf. His research is focussed on the irradiation behaviour of pressure vessel steels.

Dr.-Ing. Thomas Weißgärber, born 1969, studied Materials Science at the TU Dresden, where he defended his PhD thesis in 1998. Since then he has been with the Fraunhofer Institute for Manufacturing and Advanced Materials (IFAM), Branch Lab Powder Metallurgy and Composite Materials, Dresden. He is head of the department of High Performance Sintered Materials.


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Published Online: 2013-05-26
Published in Print: 2010-03-01

© 2010, Carl Hanser Verlag, München