Effect of interface chemistry and structure on grain morphology and plastic deformation of cemented carbides

Start date 01/01/2011
End date The project is closed: 31/12/2016
Cemented carbides are used for metal cutting and rock drilling. They consist of micron-sized tungsten carbide grains that form a hard skeleton, surrounded by a tough, cobalt-rich binder phase.  By different additions, both to the binder and the skeleton, and by wear resistant coatings the performance of cemented carbides can be dramatically improved. Today’s high cutting speeds give very high temperatures and loads, so plastic deformation (i.e. a shape change) is often the dominant wear mechanism. We are testing several WC-Co-based materials in hot compression, and we study the resulting deformation in great detail using electron microscopy and atom probe tomography (APT). In addition, an interatomic potential for the W-C-Co system has been developed, and molecular dynamics modeling is preformed of grain boundary sliding and grain boundary infiltration. The aim is to understand how different additions affect deformation mechanisms.​​
​Evolution of the microstructure during creep testing of WC-Co based cemented carbide
M. A. Yousfi, L. K. L. Falk, H.-O. Andrén

18th Plansee Seminar, Paper HM 58 (USB only)​

Vetenskapsrådet (Swedish Research Council), Sandvik Tooling, Sandvik Mining and Construction, Seco Tools
Sandvik Coromant, Sandvik Mining, Seco Tools, SIMAP (Laboratoire de Science et Ingénierie des Materiaux et Procédés) at INPG (Institut National Polytechnique de Grenoble)

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