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    Volume 4, Issue 2 (February 2015)

    Special Issue Paper

    Extension of Fatigue Cracks in a Low-Alloy Steel After Massive Plastic Deformation

    (Received 16 January 2014; accepted 29 August 2014)

    Published Online: 28 February 2015

    CODEN: MPCACD

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    Abstract

    Fatigue crack extension was studied in a ferritic–pearlitic steel in two different material conditions. The first one was the virgin state with a typical pearlitic microstructure containing comparatively large stacks of cementite lamellae. The second material contained predominantly globular cementite and stacks of very fine cementite lamellae and was found after massive plastic deformation during a thermo-mechanical forming process. These differences in the microstructure lead to significantly different mechanisms in the damage accumulation process under fatigue loading. Stacks of cementite lamellae pearlite were both crack initiation sites and microstructural barriers for small cracks in the virgin material, whereas the fine lamellae in the plastically deformed (cold-worked) material could cause crack deviation, but no crack initiation and no significant crack arrest or crack retardation.


    Author Information:

    Brueckner-Foit, A.
    Institute for Materials Engineering, Univ. of Kassel, Kassel,

    Besel, M.
    DLR, Institute for Materials Research, Cologne,

    Stein, T.
    Institute for Materials Engineering, Univ. of Kassel, Kassel,

    Zeismann, F.
    Institute for Materials Engineering, Univ. of Kassel, Kassel,


    Stock #: MPC20140011

    ISSN:2165-3992

    DOI: 10.1520/MPC20140011

    Author
    Title Extension of Fatigue Cracks in a Low-Alloy Steel After Massive Plastic Deformation
    Symposium ,
    Committee E08