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Sökning: WFRF:(Mingard Ken)

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1.
  • Borgh, Ida, et al. (författare)
  • On the three-dimensional structure of WC grains in cemented carbides
  • 2013
  • Ingår i: Acta Materialia. - : Elsevier BV. - 1359-6454 .- 1873-2453. ; 61:13, s. 4726-4733
  • Tidskriftsartikel (refereegranskat)abstract
    • 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.
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2.
  • Toller-Nordström, Lisa, et al. (författare)
  • Abrasive wear of hardmetals with a binder phase forming deformation induced martensite
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • Hardmetals with alternative binder phases with compositions tailored for specific applications may be used to achieve improved performance of tools. In this paper an iron based binder phase that has previously been found to undergo a phase transformation from austenite to martensite as a response to plastic deformation is tested in three different tests: Micro scratch tests, micro abrasion and rock turning. All three tests show characteristic wear of the tungsten carbide and removal of binder phase from the surface.
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