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Study on the local damage mechanisms in WC-Co hard metals during scratch testing

Published online by Cambridge University Press:  01 February 2011

Siphilisiwe Ndlovu ,
Karsten Durst ,
Heinz Werner Hoeppel  and
Mathias Goeken
Siphilisiwe Ndlovu
Affiliation:
siphilisiwe.ndlovu@ww.uni-erlangen.de, University of Erlangen-Nuernberg, Department of Materials Science and Engineering, Erlangen, 91058, Germany
Karsten Durst
Affiliation:
karsten.durst@ww.uni-erlangen.de, University of Erlangen-Nuernberg, Department of Materials Science and Engineering, Erlangen, 91058, Germany
Heinz Werner Hoeppel
Affiliation:
hoeppel@ww.uni-erlangen.de, University of Erlangen-Nuernberg, Department of Materials Science and Engineering, Erlangen, 91058, Germany
Mathias Goeken
Affiliation:
mathias.goeken@ww.uni-erlangen.de, University of Erlangen-Nuernberg, Department of Materials Science and Engineering, Erlangen, 91058, Germany
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Abstract

The effect of the cobalt content and WC grain size on the deformation behaviour of WC-Co hard metals was investigated by studying materials with a varying WC grain size and cobalt content. The WC grain size ranged from 2.65 to 0.25 µm and the binder content ranged from 6 to 15 wt%. Single and multiple scratch tests were conducted using a Nano indenter with a Berkovich diamond tip and the load ranged from 5 to 500 mN with a tip sliding velocity of 10 µm/s. Several damage mechanisms were observed and these show a combination of ductile and brittle wear. The bulk properties i.e. composite properties of the hard metal determine the wear in the 6 wt% Co samples on the other hand the 15 wt% Co samples exhibited a localised response to the wear i.e. the wear is determined by the individual phases in the hard metal.

Keywords

microstructuregrain sizetribology
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1049: Symposium AA – Fundamentals of Nanoindentation and Nanotribology IV , 2007 , 1049-AA05-16
Copyright
Copyright © Materials Research Society 2008

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References

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