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Mechanisms of plastic deformation of WC-Co and Ti(C,N)-WC-Co

Gustaf Östberg (Institutionen för teknisk fysik, Mikroskopi och mikroanalys) ; Katharina Buss ; Mikael Christensen (Institutionen för teknisk fysik, Material- och ytteori) ; Susanne Norgren ; Hans-Olof Andrén (Institutionen för teknisk fysik, Mikroskopi och mikroanalys) ; Daniele Mari ; Göran Wahnström (Institutionen för teknisk fysik, Material- och ytteori) ; Ingrid Reineck
Int. J. Refract. Hard Mater. (0263-4368). Vol. 24 (2006), 1-2, p. 135-144.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Cemented carbides, Characterisation, Plastic deformation, DFT, Internal friction



Denna post skapades 2007-12-20. Senast ändrad 2017-06-28.
CPL Pubid: 63610

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Mikroskopi och mikroanalys (2005-2012)
Institutionen för teknisk fysik, Material- och ytteori (1900-2015)

Ämnesområden

Den kondenserade materiens fysik

Chalmers infrastruktur