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Formation of carbide segregations in nanoscaled hardmetals

  • : Johannes Pötschke1, Markus Mayer1, Volkmar Richter1
  • : 1Fraunhofer IKTS
  • : PDF Download
  • : 2015

Abstract

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 so called grain growth inhibitors (GGI) such as VC and Cr3C2 are commonly added. In order to keep the grain size below 200 nm higher amounts of GGI than normally are added. Due to the high amount of GGI carbides often carbide segregations with a size of up to 20 µm 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 as on the kind and amount of inhibitor used. A mechanism for the formation of V-, Cr- and V-+Cr-rich segregations is proposed

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