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    Volume 6, Issue 1

    Austempering and Boro-Austempering Treatments in Gray Cast Iron

    (Received 21 August 2015; accepted 3 March 2017)

    Published Online: 2017

    CODEN: MPCACD

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    Abstract

    Austempering heat treatment of gray cast iron can significantly improve its mechanical properties. In addition, increasing its surface hardness by means of thermochemical treatments such as boriding can further extend its range of use. In this work, gray cast iron samples with the composition 3.6 % C - 2.1 % Si - 0.43 % Mn - 0.26 % Cr - bal Fe were subjected to austempering treatment using austenitizing at 900°C, with subsequent cooling using austempering salt baths at temperatures of 240°C, 300°C, and 360°C for 1, 2, 3, and 4 hours with subsequent cooling in air. Another set of samples was subjected to boro-austempering treatments, which consisted of boriding at 950°C for 2 to 4 hours in molten borax and followed by cooling in salt baths at temperatures of 240°C, 300°C, and 360°C for 1, 2, 3, and 4 hours, with subsequent air cooling. This approach avoids the need for further heating the work piece to perform the austempering treatment. Subsequently, the samples were characterized for micro-hardness and adhesive wear behavior. The austempering treatment significantly increased material performance, and the boro-austempering treatment further improved its properties.

    Author Information:

    Mariani, Fábio Edson
    Universidade de São Paulo, Departamento de Engenharia de Materiais, São Carlos, São Paulo,

    Bortoluci de Assis, Gustavo
    Universidade de São Paulo, Departamento de Engenharia de Materiais, São Carlos, São Paulo,

    Casteletti, Luiz Carlos
    Universidade de São Paulo, Departamento de Engenharia de Materiais, São Carlos, São Paulo,

    Neto, Amadeu Lombardi
    Universidade Tecnológica Federal do Paraná, Departamento de Engenharia de Materiais, Londrina, Paraná,

    Totten, George Edward
    Portland State University, Department of Materials, Portland, OR


    Stock #: MPC20150038

    ISSN:2379-1365

    DOI: 10.1520/MPC20150038

    Author
    Title Austempering and Boro-Austempering Treatments in Gray Cast Iron
    Symposium ,
    Committee A04