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  • 1.
    Frisk, Karin
    et al.
    RISE, Swerea, Swerea KIMAB AB.
    Markström, Andreas
    RISE, Swerea, Swerea KIMAB AB.
    Effect of Cr and v on phase equilibria in Co-WC based hardmetals2008Inngår i: International Journal of Materials Research - Zeitschrift für Metallkunde, ISSN 1862-5282, E-ISSN 2195-8556, Vol. 99, nr 3, s. 287-293Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    New measurements of the influence of Cr and V on the melting temperature of the binder phase in Co-based hardmetals are presented. It was shown that both Cr and V affect the melting temperature significantly. Cr decreases the melting temperature by over 100°C, and V by approximately 40°C. This is due to the high solubility of Cr and V in liquid Co, and this solubility was determined by experiments and calculations. The solubility of Cr in solid fccCo is also discussed, as well as the composition of the MC, M7C3 and the M6C carbides in alloys with Cr and V. The new experimental information is used to obtain a reliable thermodynamic description of the binder phase (Co-rich) in C-Co-Cr-W and C-Co-V-W alloys. Calculated equilibria are compared with experiments. © Carl Hanser Verlag GmbH & Co. KG.

  • 2.
    Hutchinson, Bevis
    et al.
    RISE, Swerea, Swerea KIMAB AB.
    Barnett, M.R.
    Deakin University.
    Ghaderi, A.
    Deakin University.
    Cizek, P.
    Deakin University.
    Sabirov, I.
    Deakin University.
    Deformation modes and anisotropy in magnesium alloy AZ312009Inngår i: International Journal of Materials Research - Zeitschrift für Metallkunde, ISSN 1862-5282, E-ISSN 2195-8556, Vol. 100, nr 4, s. 556-563Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A strongly textured sheet of magnesium alloy AZ31 has been subjected to tensile testing at temperatures between ambient and 300 °C. Structures have been examined by optical and transmission electron microscopy and also by atomic force microscopy to quantify surface displacements seen at grain boundaries. Plastic anisotropy varies strongly with test temperature as was observed previously by Agnew and Duygulu. The present findings do not support the view that crystallographic <c + a> becomes a major contributor to deformation at higher temperatures. Rather, the material behaviour reflects an increasing contribution from grain boundary sliding despite the relatively high strain rate (10-3 s-1 ) used in the mechanical tests. © Carl Hanser Verlag GmbH & Co. KG.

  • 3.
    Lindwall, Greta
    et al.
    RISE, Swerea, Swerea KIMAB AB.
    Frisk, Karin
    RISE, Swerea, Swerea KIMAB AB.
    The effect of nitrogen on the coarsening rate of precipitate phases in iron-based alloys with chromium and vanadium: Experimental and theoretical investigations2013Inngår i: International Journal of Materials Research - Zeitschrift für Metallkunde, ISSN 1862-5282, E-ISSN 2195-8556, Vol. 104, nr 5, s. 442-451Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A comparison of the coarsening of nitrogen-rich vanadium precipitates and the coarsening of carbon-rich vanadium precipitates is presented. The precipitate phases are studied experimentally, via fabrication of model alloys, and theoretically, via simulations utilizing the DICTRA software. The experimental investigations indicate that the nitrogen-rich precipitates exhibit a slower coarsening behaviour than the carbon-rich precipitates. Analysis using thermodynamic and kinetic modelling shows that this can be explained by the higher thermodynamic stability of the nitrogen-rich precipitate compared to the carbon-rich precipitate. The calculated coarsening rates are compared with the measured rates, and found to be in satisfactory agreement using reasonable values for the interfacial energies. The investigations are motivated by the fine precipitate size distribution of nitrides and carbonitrides characteristic for high nitrogen alloyed tool steels produced by means of powder metallurgy. © 2013 Carl Hanser Verlag GmbH &Co. KG.

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