The gas-nitriding characteristics of valve springs made from three different grades of oil-tempered wires were investigated as a preliminary study, and the springs made from the most heat resistant grade of oil-tempered wire (SOTHS) were selected for further study. As a result, fatigue limit strength as high as 736MPa (mean stress) +/- 665MPa (amplitude stress) at a stress repetion of 5×107 cycles was obtained by applying gas-nitriding, followed by multi-stage shot-peening, the last stage of which was very fine steel bead peening with the average size less than 50 μm (SS-Treatment). The reasons for the high fatigue endurance obtained are also discussed.


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    Title :

    Recent Progress with Nitrided Valve Springs for Automobile Internal Combustion Engines


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2003 World Congress & Exhibition ; 2003



    Publication date :

    2003-03-03




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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