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  • 1.
    Adolfi, Sofia
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Slag inclusion formation during solidification of steel alloys and in cast iron2007Licentiate thesis, comprehensive summary (Other scientific)
    Abstract [en]

    This thesis explores the formation of segregation and inclusions during solidification of steel and cast iron. A better understanding of the formation mechanism should result in decreasing fraction of defects during solidification of ingot and strand material.

    Density driven macrosegregation was studied both experimentally and theoretically to see the effect of channel segregation on the total segregation. Formation of these pencil-like segregations is due to natural convection in the solidifying metal caused by liquid enrichment of elements with lower density compared to the bulk. It is suggested to change the composition to compensate for this density difference.

    Inclusion precipitation can be finite by limitations in segregation. Saturated liquid is found in the last solidified areas, often between dendrites. Here the enrichment of the liquid is possible due to microsegregation. Meanwhile crystals form and solidify the elements with low solubility in the solid is pushed out in the remaining liquid. Soon the liquid is saturated to the level where spontaneous formation of inclusions occurs. Microstructure studies by aid of SEM and micro-probe measurements are analysed to find at what point during solidification process the inclusions start to form. In steel making this formation has a detrimental effect on the mechanical properties in contrary to the production of nodular cast iron where the inclusions have a beneficial effect on the graphite formation.

    Inoculation of cast iron aims at reaching higher number density of graphite nodules, nodule morphology modification and control of nodule distribution during solidification. Late precipitation of nucleation sites has shown to have a positive impact on preventing chill. To find the most potent inoculation agent different additives were tested. Special effort has been made to analyse the effect of oxides and sulphides as nucleation sites.

  • 2.
    Adolfi, Sofia
    et al.
    KTH, Superseded Departments, Casting of Metals.
    Lagerstedt, Anders
    KTH, Superseded Departments, Casting of Metals.
    Sarnet, Jan
    Scana Steel Björneborg AB.
    Fredriksson, Hasse
    KTH, Superseded Departments, Casting of Metals.
    Macrosegregation In Ingot Cast Tool Steel2004Report (Other academic)
  • 3.
    Adolfi, Sofia
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Mori, Kenji
    Fredriksson, Hasse
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    MnS precipitation during solidification in presence of oxide nuclei2007Conference paper (Other academic)
  • 4.
    Lagerstedt, Anders
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Adolfi, Sofia
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Fredriksson, Hasse
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Crack formation during continuous casting of tool steel2005In: Transactions of the Indian Institute of Metals, ISSN 0019-493X, Vol. 58, no 4, p. 671-678Article in journal (Refereed)
    Abstract [en]

    The formation of cracks has been studied during continuous casting of a tool steel. Experimental work was performed in a continuous slab caster and the position of the cracks was determined as a function of distance from the cooling surface. Numerically calculated temperatures and elastic stresses were combined with experimentally determined thermomechanical data of the cast material in order to predict crack positions. The model was extended to include the effect on the strain from both thermal shrinkage and the shrinkage caused by condensation of vacancies during the solidification process.

  • 5.
    Magnusson, Lena
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Adolfi, Sofia
    Fredriksson, Hasse
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    A thermodynamic analysis of the inoculation process in cast iron.2006Report (Other academic)
1 - 5 of 5
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