This study evaluated the bending fatigue performance of a modified SAE 4320 steel as a function of carburizing technique. S-N curves and endurance limits were established by fatigue testing modified Brugger-type specimens that are designed to simulate a single gear tooth. Fractured specimens were examined by light and electron microscopy to determine crack initiation sites, establish the extent of stable crack propagation, and analyze surface oxide types and distributions. Test results show that plasma-carburizing boosted the endurance limit of an oxidation-susceptible gear steel from 1100 MPa to 1375 MPa. Fatigue endurance limits in excess of 1400 MPa had previously been achieved in gas-carburized SAE 4320 steels by reheat treatments and reductions in high-oxidation potential elements. The level of improvement observed in this study suggests that any of these advanced processing techniques can allow significant size reductions and weight savings in automotive transmission gears.


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    Titel :

    Bending Fatigue Performance of Gas- and Plasma-Carburized Steels


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    International Congress & Exposition ; 1999



    Erscheinungsdatum :

    1999-03-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Bending fatigue performance of gas- and plasma-carburized steels

    Corbelissen,B.E. / Matlock,D.K. / Krauss,G. et al. | Kraftfahrwesen | 1999


    Bending Fatigue Performance of Gas- and Plasma-Carburized Steels

    Cornelissen, B. E. / Matlock, D. K. / Krauss, G. et al. | British Library Conference Proceedings | 1999


    Bending fatigue performance of carburized gear steels

    Sieber,R. / Rockwell International,US | Kraftfahrwesen | 1992


    Bending Fatigue Performance of Carburized Gear Steels

    Sieber, Ray | SAE Technical Papers | 1992


    Bending Fatigue Performance of Carburized 4320 Steel

    Matlock, David K. / Krauss, George / Cohen, Rachael E. | SAE Technical Papers | 1993