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    Volume 3, Issue 1

    Production of Austempered Gray Iron (AGI) Using Forced Air Cooling

    (Received 11 February 2014; accepted 25 June 2014)

    CODEN: MPCACD

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    Abstract

    This paper presents the outcome of the production of austempered gray iron (AGI) using forced air cooling as the quenching medium. Samples from Class 20 gray cast iron were prepared for micrographic analysis, x-ray diffraction (XRD) analysis, and mechanical testing. The prepared samples were austenitized at 920°C, soaked for 1 h, force air-cooled to the austempering temperature range of 250°C to 400°C (at 25°C intervals), held for another hour at the austempered temperature to allow for complete phase transformation, and then air-cooled to room temperature. The optical micrograph revealed a unique microstructure consisting of ferrite (α) and high carbon austenite (γHC) called ausferrite, the coarseness of which increases as the austempering temperatures increases. XRD analysis revealed only the peak of the α phase. The estimated effective particle size of this phase increases with an increase in austempering temperature. The results of mechanical tests showed significant increases in the tensile strength, hardness, toughness, and ductility of austempered samples of Class-20 grade gray cast iron. Conclusively, AGI has a unique combination of high strength and ductility that makes it suitable for the manufacture of parts in which high strength, high wear resistance, and high ductility are required.


    Author Information:

    Olawale, J. O.
    Dept. of Materials Science and Engineering, Obafemi Awolowo Univ.,

    Oluwaseguun, K. M.
    Dept. of Materials Science and Engineering, Obafemi Awolowo Univ.,

    Ezemenaka, D. I.
    Dept. of Materials Science and Engineering, Obafemi Awolowo Univ.,

    Adisa, S. B.
    Dept. of Materials Science and Engineering, Obafemi Awolowo Univ.,


    Stock #: MPC20140024

    ISSN:2165-3992

    DOI: 10.1520/MPC20140024

    Author
    Title Production of Austempered Gray Iron (AGI) Using Forced Air Cooling
    Symposium ,
    Committee A04