Mechanisms of plastic deformation of WC-Co and Ti(C,N)-WC-Co
Artikel i vetenskaplig tidskrift, 2006

The deformation of the cutting edge of inserts made from WC–Co and Ti(C, N)–19%WC–Co upon radial turning was measured as a function of the cutting speed. Ab initio calculations of some grain boundary geometries in WC–Co indicated that Co segregates to WC/WC grain boundaries in submonolayer proportions and increases their strength and resistance to Co infiltration. This was also confirmed with TEM-EDX. SEM studies showed that during plastic deformation the hard phase skeletons in both materials were partly broken up and infiltrated by binder phase. TEM observations showed a considerable deformation of the WC grains and some infiltrated grain boundaries were facetted along low energy planes. In the cermet, no deformation of the hard phase grains could be seen. The plastic deformation at high temperatures observed by three-point bending corresponds to a number of relaxation processes, detected by internal friction, related to grain boundary sliding. Both materials deform by grain boundary sliding, accommodated in the cermet by Co diffusion and in the WC–Co by deformation of the hard phase and diffusion of Co.

DFT

Plastic deformation

Cemented carbides

Internal friction

Characterisation

Författare

Gustaf Östberg

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Katharina Buss

Ecole Polytechnique Federale De Lausanne

Mikael Christensen

Chalmers, Teknisk fysik, Material- och ytteori

Susanne Norgren

R and D Materials and Processes

Hans-Olof Andrén

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Daniele Mari

Ecole Polytechnique Federale De Lausanne

Göran Wahnström

Chalmers, Teknisk fysik, Material- och ytteori

Ingrid Reineck

R and D Materials and Processes

Int. J. Refract. Hard Mater.

0263-4368 (ISSN)

Vol. 24 1-2 135-144

Ämneskategorier

Den kondenserade materiens fysik

DOI

10.1016/j.ijrmhm.2005.04.009

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Senast uppdaterat

2018-05-03