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  • 1.
    Elfsberg, Jessica
    et al.
    Royal Institute of Technology, Sweden.
    Matsushita, Taishi
    Royal Institute of Technology, Sweden.
    Measurements and Calculation of Interfacial Tension between Commercial Steels and Mould Flux Slags2011In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 82, no 4, p. 404-414Article in journal (Refereed)
    Abstract [en]

    Surface quality of continuously cast is strongly influenced by the interfacial tension between steel and mould flux slag. The meniscus shape and the inclusion entrapment are directly determined by interfacial tension. To achieve a better understanding of the continuous casting process, the interface between four commercial steels and the mould fluxes used at the continuous casting of each steel grade have been investigated. The situation at this interface is determined by the surface tension of steel and slag respectively and also by the mass transfer occurring across the interface. The surface tensions of the mould flux slags have been measured by sessile drop method. The results indicate that the surface tension of mould flux slags decreases with increasing temperature but does not vary so much within the present composition range. Interfacial tensions between steel samples and mould flux slags have been measured in the same way with the aid of X-ray unit. Estimation of interfacial tension from the steel and slag composition was done by applying empirical models. The measured and the calculated values were in agreement. The interfacial tension was lower for higher alloyed steel grades according to both experiments and calculations though the influence of surface active elements is significant.

  • 2.
    Matsushita, Taishi
    et al.
    Royal Institute of Technology, Sweden.
    Umezawa, Yuzo
    Kyushu Institute of Technology, Japan.
    Seetharaman, Seshadri
    Royal Institute of Technology, Sweden.
    Rupture Strength of some Mould Flux Slag Films relevant to Swedish Continuous Casting Practice2008In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 79, p. 835-838Article in journal (Refereed)
  • 3.
    Persson, M.
    et al.
    Royal Institute of Technology, Sweden.
    Matsushita, Taishi
    Royal Institute of Technology, Sweden.
    Zhang, J.
    Seetharaman, Seshadri
    Royal Institute of Technology, Sweden.
    Estimation of molar volumes of some binary slags from enthalpies of mixing2007In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 78, p. 102-108Article in journal (Refereed)
  • 4.
    Siafakas, Dimitrios
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Matsushita, Taishi
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Jarfors, Anders
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Lauenstein, Åsa
    Swerea SWECAST AB.
    Ekerot, Sven
    Comdicast AB.
    Particles precipitation in Ti and Al deoxidized Hadfield steels2016In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 87, no 10, p. 1344-1355Article in journal (Refereed)
    Abstract [en]

    The characteristics and precipitation mechanism of particles in titanium and aluminum treated Hadfield steel casted during pilot scale experiments have been studied. Light Optical Microscopy (LOM), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) were utilized for the particle analysis and characterization. Additionally, thermodynamic equilibrium calculations were performed using Thermo-Calc software. Aluminum oxides, titanium carbon nitrides, titanium carbides and manganese sulfides were the main types of particles found. The order of precipitation during solidification and chemical composition range of each type of particle was determined. Aluminum Oxides were found to act as nucleation sites fortitanium carbon nitrides. Thermodynamic equilibrium calculation for particles characteristics were in good agreement with the experimental findings. Titanium carbides were found to form during initial stages of the Ferro-titanium additions dissolution.

  • 5.
    Wunderlich, R. K.
    et al.
    Ulm University, Germany.
    Fecht, Hans-Jörg
    Ulm University, Germany.
    Egry, Ivan
    DLR, Germany.
    Etay, J.
    Battezzati, L.
    University of Turin, Italy.
    Ricci, E.
    IENI, Italy.
    Matsushita, Taishi
    Royal Institute of Technology, Sweden.
    Seetharaman, Seshadri
    Royal Institute of Technology, Sweden.
    Thermophysical properties of a Fe-Cr-Mo Alloy in the solid and liquid phase2012In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 83, no 1, p. 43-54Article in journal (Refereed)
    Abstract [en]

    Results of a thermophysical characterization of a Fe-Cr-Mo alloy in the solid and liquid phases are reported. Methods applied include calorimetry, dilatometry; the laser flash technique for thermal diffusivity measurement and ultrasound pulse echo for the measurement of the room temperature sound velocities and elastic constants. Density in the liquid phase and surface tension were measured by optical dilatometry and by the oscillating drop method on electromagnetic levitated specimen. In addition, surface tension and viscosity were measured by the oscillating drop method on board parabolic flights under reduced gravity conditions. The methods applied and results obtained are presented. This work represents a collaborative effort, including round robin measurements in different laboratories for a characterization of the basic thermophysical properties needed for process simulation.

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