The influence of tensile strength on fatigue strength and the effect of strengthening mechanism on fatigue notch factor were investigated into conventional mild steels, HSLA stels, DP steels and TRIP steels. The grade of studied steels was alterned from 440 MPa to 780 MPa. Not only smooth fatigue specimens with side surface ground and smoooth fatigue specimens with laser-cut side surface but also fatigue specimens with a pierced hole were prepared for each steel sheets. Fatigue tests were conducted in an axial load method. These experiments made it clear that the fatigue limits of smooth specimen increase along the tensile strength approximately indepedent of strengthening mechanism but those of notched specimen do not necessarily increase along the tensile strength. Namely, fatigue limits of DP steels and TRIP steels with notch increase in proportion to tensile strength although of HSLA steels with notch do not increase. Laser cut makes the side surface of specimen very rough compared to mechanical cut hereby fatigue limits of these steels decrease.


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    Title :

    Effect of strengthening mechanism on faituge properties of hot-rolled sheet steels


    Additional title:

    Einfluß des Verfestigungsmechanismus auf die Ermüdungseigenschaften von warmgewalzten Stahlblechen


    Contributors:
    Yokoi, T. (author) / Takahashi, M. (author) / Ikenaga, N. (author)


    Publication date :

    2002


    Size :

    9 Seiten, 18 Bilder, 1 Tabelle, 15 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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