Volume 9, Issue 1 (January 2012)

    Thermal Oxidative Stability of Vegetable Oils as Metal Heat Treatment Quenchants

    (Received 15 February 2011; accepted 12 August 2011)

    Published Online: 2011

    CODEN: JAIOAD

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    Abstract

    The potential use of vegetable oil derived industrial oils continues to be of great interest because vegetable oils are relatively non-toxic, biodegradable, and a sustainably produced basestock alternative to petroleum oil, a non-renewable basestock. For the conservation of the environment, bio-mass materials, such as vegetable oils, are desirable as substitutes for petroleum oil in heat treatment. Therefore, it is expected that these basestock materials will continue to be of increasing interest in the heat treatment industry. However, the fatty ester components containing conjugated double bonds of the triglyceride structure of vegetable oils typically produce considerably poorer thermal oxidative stability than that achievable with petroleum basestocks under typical use conditions. This is especially true when a vegetable oil is held in an open tank with agitation and exposure to air at elevated temperatures for extended periods of time (months or years). Furthermore, when used as quenchants, furnace loads of hot steel (850 °C) are typically rapidly immersed and cooled to approximately 50 °C to 60 °C bath temperatures for steel hardening applications. Clearly, for this application, reasonable thermal-oxidative stability is essential. This paper reviews the work completed thus far in screening various vegetable oils as potential steel quenchants both with and without antioxidants. Particular focus is placed, where possible, on comparing pressure differential scanning calorimetry as a potential screening method with the more commonly used (for this application) modified Indiana Stirring Oxidation Test. In addition, the general impact of oxidation on the quenching performance of the better vegetable oil candidates is shown.


    Author Information:

    Carvalho de Souza, Ester
    Universidade de São Paulo,

    Belinato, Gabriela
    Universidade de São Paulo,

    Simencio Otero, Rosa L.
    Universidade de São Paulo,

    Cícero Adão Simêncio, Éder
    Universidade de São Paulo,

    Augustinho, Sylvana C. M.
    Universidade de São Paulo,

    Capelupi, William
    Mercedes-Benz do Brasil Ltda.,

    Conconi, Charles
    Mercedes-Benz do Brasil Ltda.,

    Canale, Lauralice C. F.
    Universidade de São Paulo,

    Totten, George E.
    Portland State University,


    Stock #: JAI103817

    ISSN: 1546-962X

    DOI: 10.1520/JAI103817

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    Author
    Title Thermal Oxidative Stability of Vegetable Oils as Metal Heat Treatment Quenchants
    Symposium , 0000-00-00
    Committee D02