Cemented tungsten carbide (WC) is commonly used for wear-resistant applications, such as cutting tools and abrasives due to its extremely high hardness. This hardness leads to post-process machining of WC to be time-and cost-intensive. This study examined the feasibility of additive manufacturing of cemented WC to near-net-shape in an effort to reduce post-process machining. The binder phase in the manufactured samples is an iron-based alloy, which has a lower melting temperature than cobalt, the conventional binder in cemented WC. In this proof-of-concept study, cuboid specimens of WC with a low content of the iron-based alloy binder were printed; the effect of different processing conditions on the resultant density and microstructure of the material were investigated. Theoretical densities as high as 95% were achieved using this method. Artifacts indicative of the manufacturing process are present in the samples, and the challenges in removing the processing history from the final microstructure are discussed.
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TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request.Effect of mechanical vibration on the size and microstructure of titania granules produced by auto-granulation Nicholas Ku, Colin Hare, Mojtaba Ghadiri, Martin Murtagh, Richard A. Haber Abstract Auto-granulation is the growth of particle clusters within a dry, fine powder bed due to the bulk powder cohesion. This clustering occurs without the addition of any binder to the system due to simple agitation of a powder, such as during storage or handling. For this reason, it is important in powder processing to be able to characterize this behavior. In this study, a submicron titania powder is mechanically vibrated under controlled conditions to induce clustering and promote auto-granulation. The amplitude and frequency of the vibration is varied to view the effect on the equilibrium granule size. A statistical model of the effect is also developed to determine that the granule size increases linearly with vibrational energy. Furthermore, imaging of cross-sections of the granules is conducted to provide insight into to the internal microstructure and measure the packing fraction of the constituent particles. It is found that under all vibrational conditions investigated the particles exhibit a core-rim microstructure.
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