On the plastic deformation mechanisms of WC-Co alloys at high temperature

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dc.contributor.author Han, Xiao
dc.date.accessioned 2007-02-26T11:24:10Z
dc.date.available 2007-02-26T11:24:10Z
dc.date.issued 2007-02-26T11:24:10Z
dc.identifier.uri http://hdl.handle.net/10539/2122
dc.description Student Number : 0413336G - MSc(Eng)dissertation - School of Chemical and Metallurgical Engineering - Faculty of Engineering and the Built Environment en
dc.description.abstract This dissertation reports systematic work aimed at determining the plastic deformation mechanisms that led to strains at fracture as high as 4.7% in WC-Co alloys at 1000°C when subjected to 3-point bending tests. The three grades investigated have a Co content of 15wt% and WC grain sizes of 1.3, 0.35 and 0.3 μ m respectively and were received after they were tested in bending. Fractography, macrostructural and microstructural investigations were carried out in attempts to identify the mechanisms leading to the large strains. Techniques used included light microscopy, scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS) and quantitative image analysis. Through comparisons of the results from the three grades at various temperatures, it was possible to establish that the large strain at 1000°C are mainly due to cracking and cobalt drift. During the fractographic investigations it was found that the grades which contained VC as a grain refiner exhibited steps on the WC grains and that fracture propagated preferentially along the stepped WC grain boundaries. en
dc.format.extent 43836569 bytes
dc.format.mimetype application/pdf
dc.language.iso en en
dc.subject cemented carbide en
dc.subject high temperature plasticity en
dc.title On the plastic deformation mechanisms of WC-Co alloys at high temperature en
dc.type Thesis en


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