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Formation of carbide segregations in nanoscaled hardmetals

: Pötschke, Johannes; Mayer, Markus; Richter, Volkmar

Poster urn:nbn:de:0011-n-4231706 (477 KByte PDF)
MD5 Fingerprint: e29b794a9d6b40667e0730de4be45aea
Erstellt am: 25.11.2016

European Powder Metallurgy Association -EPMA-:
Euro PM 2015 Congress & Exhibition : 4 - 7 October 2015, Reims, France; Proceedings USB
Stockholm: EPMA, 2015
ISBN: 978-1-899072-47-7
1 Folie
International Powder Metallurgy Congress and Exhibition (Euro PM) <2015, Reims>
Poster, Elektronische Publikation
Fraunhofer IKTS ()

The use of nanoscaled tungsten carbide (WC) powders allows the production of very fine and nanoscaled hardmetals. These hardmetals show very high hardness values, while keeping a good fracture toughness. To inhibit grain growth the addition of so called grain growth inhibitors (GGI) like VC and Cr3C2 is commonly used. To keep the grain size below 200 nm larger amounts of GGI than normally added are needed. Due to the high amount of carbides often carbide segregations with a size of up to 20 μm and thus well beyond the WC grain size are detected. To limit the size and formation of such segregations different approaches were studied. It could be shown that the formation is strongly dependent on the carbon content of the hardmetal as well on the kind and amount of Inhibitor used. A Mechanism is proposed for the formation of V, Crand V+Cr rich segregations.