Strengthening Mechanisms in Fatigue

    Published: Jan 1970

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    The present state of knowledge of the role of metallurgical structure in the achievement of high fatigue resistance is critically examined and the application of such knowledge is discussed. At the present time resistance to fatigue is best characterized in terms of phenomenological parameters such as the cyclic strain hardening exponent. The effect of changes in metallurgical structure on these parameters is then the best index of the microstructural effects. The importance of distinguishing between resistance to repeated stresses as opposed to resistance to repeated plastic strains is emphasized, since the metallurgical means of achieving the required resistance can be radically different. The fatigue process is discussed in terms of plastic deformation, crack initiation, and crack propagation mechanisms, and the techniques by which these processes can be modified are detailed and related to the phenomenological parameters. Finally, a set of basic guidelines for achievement of high fatigue resistance by metallurgical means is outlined.


    crack initiation, crack propagation, fatigue (materials), metallographic structures, microstructure, plastic deformation, strains, stresses

    Author Information:

    Feltner, CE
    Scientific Research Staffpersonal member of ASTM, Ford Motor Co., Dearborn, Mich.

    Beardmore, P
    Scientific Research Staffpersonal member of ASTM, Ford Motor Co., Dearborn, Mich.

    Paper ID: STP26841S

    Committee/Subcommittee: E08.01

    DOI: 10.1520/STP26841S

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