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  • 1.
    Elfsberg, Jessica
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
    Influence of Mould Flux Properties on Early Solidification in Continuous Casting2010Doctoral thesis, comprehensive summary (Other academic)
  • 2.
    Elfsberg, Jessica
    et al.
    KTH, Superseded Departments, Casting of Metals.
    Fredriksson, Hasse
    KTH, Superseded Departments, Casting of Metals.
    Oscillation Mark Formation on Continuously Cast Copper2003Report (Other academic)
  • 3.
    Elfsberg, Jessica
    et al.
    KTH, Superseded Departments, Materials Science and Engineering.
    Fredriksson, Hasse
    KTH, Superseded Departments, Materials Processing.
    Oscillation Mark Formation on Continuously Cast Stainless Steel and Carbon Steel Slabs2003Report (Other academic)
  • 4.
    Elfsberg, Jessica
    et al.
    KTH, Superseded Departments, Casting of Metals.
    Fredriksson, Hasse
    KTH, Superseded Departments, Casting of Metals.
    Theoretical Study of Oscillation Mark Formation in Continuous Casting Processes2003Report (Other academic)
  • 5.
    Elfsberg, Jessica
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
    Matsushita, Taishi
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
    Determination of the interfacial tension between commercial steel grades and mould flux slags by experiments and by empirical modelsIn: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344XArticle in journal (Other academic)
  • 6.
    Elfsberg, Jessica
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
    Matsushita, Taishi
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
    Measurements and Calculation of Interfacial Tension between Commercial Steels and Mould Flux Slags2011In: Steel Research International, ISSN 1611-3683, 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.

  • 7.
    Elfsberg, Jessica
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
    Matsushita, Taishi
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
    X-Ray Observation of Gas Evolution, Flotation, and Emulsification of Molten Carbon Steel Immersed in Mold Flux2011In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 42, no 2, p. 265-268Article in journal (Refereed)
    Abstract [en]

    At two interfacial-tension measurement experiments with the same experimental conditions, steel samples and mold flux samples of the same compositions were melted in crucibles from the same batch. During the first experiment, the steel drop melted far below its liquidus and then was emulsified. At the second experiment, the steel melted at the expected temperature but did not emulsify. The difference that can be identified is the mass of the steel samples.

  • 8.
    Elfsberg, Jessica
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
    Seetharaman, Seshadri
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
    Matsushita, Taishi
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
    Experimental study of interfacial phenomena between commercial steel and mould flux slag: influence of oxide additions to the mould fluxIn: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460Article in journal (Other academic)
  • 9.
    Elfsberg, Jessica
    et al.
    KTH, Superseded Departments, Casting of Metals.
    Widell, Björn
    KTH, Superseded Departments, Casting of Metals.
    Fredriksson, Hasse
    KTH, Superseded Departments, Casting of Metals.
    Experimental Study of the Formation of Oscillation Marks in Continuous Casting of Steel Billets2002In: 4th European Continuous Casting Conference, Oct 14-15 2002, Birmingham,England, 2002Conference paper (Other academic)
  • 10.
    Fredriksson, Hasse
    et al.
    KTH, Superseded Departments, Casting of Metals.
    Elfsberg, Jessica
    KTH, Superseded Departments, Casting of Metals.
    Thoughts about the Initial Solidification Process during Continuous Casting of Steel2002In: Scandinavian journal of metallurgy, ISSN 0371-0459, E-ISSN 1600-0692, Vol. 31, p. 292-297Article in journal (Other academic)
    Abstract [en]

    The initial solidification during continuous casting is very important for the surface quality of the strand. Oscillation marks are formed by the movement of the mould. One mainly distinguishes between two different types of marks, namely folding marks and overflow marks. The formation of these can be described by the heat flow and the surface tension balance. A theoretical analysis outlining the most important parameters controlling the formation of these marks is presented. A metallographic analysis of the formation was also performed. The theory and observations have been used to analyse the effect of casting speed and oscillation frequency on the formation of different types of marks. It is shown that a meniscus is formed at the top of the growing shell. The maximum height of the meniscus determines the ideal distance between the marks. The mould frequency is related to this height. A frequency that is far from ideal causes overflow marks and folding marks with macrosegregation and cracks. The distance between the marks is, in such cases, not constant. The depth of the marks is calculated from the heat flow and the surface tension balance.

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