< back to main site


On the three-dimensional structure of WC grains in cemented carbides.

Borgh, I*; Hedstrom, P*; Odqvist, J*; Borgenstam, A*; Agren, J*; Gholinia, A*; Winiarski, B*; Withers, P J*; Thompson, G E*; Mingard, K P; Gee, M G (2013) On the three-dimensional structure of WC grains in cemented carbides. Acta Mater., 61 (13). pp. 4726-4733.

Full text not available from this repository.


In the present work, the size distribution and shape of WC grains in cemented carbides (WC-Co), with different Co contents, have been investigated in three dimensions. Direct three-dimensional (3-D) measurements, using focused ion beam serial sectioning and electron backscattered diffraction (EBSD), were performed and a 3-D microstructure was reconstructed. These measurements were supplemented by two-dimensional (2-D) EBSD and scanning electron microscopy on extracted WC grains. The data from 2-D EBSD collected on planar sections were transformed to three dimensions using a recently developed statistical method based on an iterative inverse Saltykov procedure. This stereological analysis revealed that the assumed spherical shape of WC grains during the Saltykov method is reasonable and the estimated 3-D size distribution is qualitatively in good agreement with the actual distribution measured from 3-D EBSD. Although the spherical assumption is generally fair, the WC grains have both faceted and rounded surfaces. This is a consequence of the relatively low amount of liquid phase during sintering, which makes impingements significant. Furthermore, the observed terraced surface structure of some WC grains suggests that 2-D nucleation is the chief coarsening mechanism to consider.

Item Type: Article
Keywords: Three-dimensional EBSD, Three-dimensional characterisation, Carbides, Coarsening, Inverse Saltykov
Subjects: Advanced Materials
Advanced Materials > Microstructural Characterisation
Identification number/DOI: 10.1016/j.actamat.2013.05.008
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5878

Actions (login required)

View Item View Item