Fatigue crack Behaviour in a High Strength Tool Steel

Christian Højerslev, Jesper V. Carstensen, Povl Brøndsted, Marcel A.J. Somers

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    The influence of microstructure on fatigue crack initiation and crack growth of a hardened and tempered high speed steel was investigated. The evolution of fatigue cracks was followed in four point bending at room temperature. It was found that a carbide damage zone exists above a threshold load value of maximally 80% of the yield strength of the steel. The size of this carbide damage zone increases with increasing load amplitude, and the zone is apparently associated with crack nucleation. On fatigue crack propagation plastic deformation of the matrix occurs in a radius of approximately 4 microns in front of the fatigue crack tip, which is comparable with the relevant mean free carbide spacing.
    Original languageEnglish
    Title of host publicationEighth International Fatigue Congress
    EditorsA.F. Blom
    Place of PublicationSheffield
    PublisherEngineering Materials Advisory Service
    Publication date2002
    ISBN (Print)1-901537-28-5
    Publication statusPublished - 2002
    Event8th International Fatigue Congress : Design and Analysis of Welded High Strength Steel Structures - Stockholm, Sweden
    Duration: 2 Jun 20027 Jun 2002
    Conference number: 8


    Conference8th International Fatigue Congress


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