Effect of Ca–Mg and MgFeSi Graphite Nodularizers on the Nodular Graphite Characteristics of Ductile Cast Irons

    Volume 2, Issue 1

    ISSN: 2165-3992

    CODEN: MPCOAD

    Published Online: 11 October 2013

    Page Count: 9


    Atanda, P. O.
    Department of Materials Science and Engineering, Obafemi Awolowo Univ., Ile-Ife,

    Olorunniwo, O. E.
    Department of Materials Science and Engineering, Obafemi Awolowo Univ., Ile-Ife,

    Imasogie, B. I.
    Department of Materials Science and Engineering, Obafemi Awolowo Univ., Ile-Ife,

    (Received 10 September 2012; accepted 6 September 2013)

    Abstract

    The study investigated the effect of a series of Ca–Mg and a commercial grade MgFeSi graphite nodularizers, Fe75Si, and NiFeSi inoculants on the nodular characteristics (particle size, excursion ratio, degree of sphroidization, nodule count, and shape factor/nodularity) of ductile cast irons produced using a 100 kg diesel fired rotary furnace. This was with a view to controlling the volatile and fading effects of magnesium as a graphite nodularizer in the cast iron melt. Heats of the rotary furnace melts were pre-desulphurized with a pre-determined amount of CaC2:Fe45%Si in ratio 3:1. Subsequently, each melt was treated with different ratios of Ca–Mg based master alloys and the cast irons produced were compared with a commercial grade MgFeSi treated cast iron produced under the same conditions. Post-treatment inoculation in each case was carried out using Fe-75-Si. Microstructural characterization was carried out to determine the graphite nodularity and distribution characteristics. The results showed that the cast iron treated with 1:4 ratio of Ca:Mg combination master alloy yielded the optimum graphite nodularity with ASTM type 1 graphite nodule features, which are comparable to cast irons produced using the commercial grade MgFeSi nodularizer.


    Paper ID: MPC20120034

    DOI: 10.1520/MPC20120034

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    Author
    Title Effect of Ca–Mg and MgFeSi Graphite Nodularizers on the Nodular Graphite Characteristics of Ductile Cast Irons
    Symposium , 0000-00-00
    Committee A04