When improving the mechanical properties of a crankshaft by nitrocarburizing, it is important to achieve both strength as well as toughness (straightenability). By designing a material composition to provide maximum strengthening, a nitrocarburized crankshaft material has been developed without the use of a normalizing thermal treatment that has about 16% higher fatigue strength than previous crankshafts with the same material hardness, similar machinability and straightenability. The achievement of both high fatigue strength and straightenability of the developed material was made by adjusting the basic material composition for optimum microstructural control and by adding a small quantity of Mo to attain suitable ferrite strengthening. Furthermore, by omitting the normalizing treatment, the CO2 emitted during the post-hot forging processes could be reduced by up to 22%, and cost savings of up to 8% could be achieved in comparison with previous high strength crankshafts.


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    Titel :

    Strength Enhancement of Nitrocarburized Crankshaft Material


    Weitere Titelangaben:

    Sae Int. J. Mater. Manf
    Sae International Journal of Materials and Manufacturing


    Beteiligte:

    Kongress:

    SAE World Congress & Exhibition ; 2008



    Erscheinungsdatum :

    2008-04-14


    Format / Umfang :

    7 pages




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


    Strength Enhancement of Nitrocarburized Crankshaft Material

    Asai, T. / Takitani, Y. / Sano, N. et al. | British Library Conference Proceedings | 2008


    Strength enhancement of nitrocarburized crankshaft material

    Asai,T. / Takitani,Y. / Sano,N. et al. | Kraftfahrwesen | 2008


    2008-01-0431 Strength Enhancement of Nitrocarburized Crankshaft Material

    Asai, T. / Takitani, Y. / Sano, N. et al. | British Library Conference Proceedings | 2008


    Development of Non Heat-treated Nitrocarburized High Strength Crankshaft

    Tetsuya, A. / Takitani, Y. / Sano, N. et al. | British Library Conference Proceedings | 2007


    Development of high-strength nitrocarburized gear

    amataka,A. / Hisano,T. / Tahara,Y. et al. | Kraftfahrwesen | 1995