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

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.

Participants

Göran Wahnström (contact)

Professor at Applied Physics, Materials and Surface Theory

Hans-Olof Andrén

Professor at Applied Physics, Materials Microstructure

Lena Falk

Biträdande professor at Applied Physics, Materials Microstructure

Martin Gren

Doktorand at Applied Physics, Materials and Surface Theory

Mohamed Amine Yousfi

Doktorand at Applied Physics, Materials Microstructure

Collaborations

Grenoble Institute of Technology (Grenoble INP)

Grenoble, France

Le laboratoire de Science et Ingénierie des Matériaux et Procédés (SIMaP)

Saint-Martin-d'Hères, France

Sandvik Coromant

Kista, Sweden

Sandvik Mining and Sandvik Construction

Sandviken, Sweden

Seco Tools

Fagersta, Sweden

Funding

Seco Tools

Funding years 2014–2015

Sandvik Coromant

Funding years 2014–2015

Swedish Research Council (VR)

Funding years 2014–2016

Related Areas of Advance and Infrastructure

Materials Science

Area of Advance

Sustainable Development

Chalmers Driving Force

More information

Project Web Page at Chalmers

http://www.chalmers.se/sv/projekt/Sidor/In...

Latest update

2015-11-04