The exhaust valves of 21-4N or 21-2N generally have hardfaced heads for heavy-duty engines. Hardfacing alloys contain a large amount of cobalt (Co), which sometimes becomes very scarce and outrageously expensive. Therefore, some automakers have adopted nickel (Ni)-base superalloys as unfaced exhaust valves, but continued to search for less expensive heat resisting alloy.THE authors had succeeded in developing an iron (Fe)-base superalloy, RS 914, containing 40% Ni, 19% Cr, 2.8% Ti and 0.7% Al. The mechanical and chemical properties of this alloy had proved to be comparable with those of Ni-base Inconel 751. And unfaced exhaust valves of RS 914 passed endurance tests in turbo-charged diesel engines with minimal damage. This alloy is relatively low cost and easy to fabricate, so that it can be applied for unfaced exhaust valves substituting for Ni-base superalloys.


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    Title :

    Application of a Newly Developed Iron-Base Superalloy to Exhaust Valves of Diesel Engines


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE International Congress and Exposition ; 1983



    Publication date :

    1983-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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