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    Volume 3, Issue 4 (December 2014)

    Special Issue Paper

    Partial Decarburization and Intensive Quenching to Increase Fatigue Limit of Quenched Small Parts

    (Received 14 January 2014; accepted 24 June 2014)

    Published Online: 31 December 2014

    CODEN: MPCACD

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    Abstract

    The 5160 spring steel is mainly used to endure fatigue and since its Mf is below room temperature, retained austenite is usually present after conventional quenching, which is detrimental from a fatigue point of view. To reduce the amount of retained austenite, a partial decarburization was promoted (to increase the Ms and Mf, respectively) by austenitizing the steel at different temperatures and times in air, prior to performing an interrupted quenching in an accelerated media (brine) instead of the conventional oil quenching. The same quenching conditions with partial decarburization and without decarburization are compared. In addition, conventional oil quenching was performed as reference. Results showed that with a controlled partial decarburization, it is possible to increase the fatigue limit compared to the conditions without decarburization (both interrupted quenching and oil quenching). Fatigue experiments were carried out in a rotating bending fatigue type tester. Cooling curves, decarburization profiles, fraction of martensite plots, and fatigue data are discussed.


    Author Information:

    Lozano, D. E.
    Frisa Forgings, Santa Catarina, Nuevo León,

    Totten, G. E.
    G.E. Totten & Associates LLC, Seattle, WA

    Martinez-Cazares, G. M.
    Universidad Autónoma de Nuevo León, San Nicolás de los Garza,

    Mercado-Solis, R.
    Universidad Autónoma de Nuevo León, San Nicolás de los Garza,


    Stock #: MPC20140008

    ISSN:2165-3992

    DOI: 10.1520/MPC20140008

    Author
    Title Partial Decarburization and Intensive Quenching to Increase Fatigue Limit of Quenched Small Parts
    Symposium ,
    Committee A01