Sintered steel based on 1.5 % Mo prealloyed powder with 4 % Ni and 2 % Cu in diffusion bonded from plus 0.5% carbon has become a standard grade for high strength applications. The high alloy content yields good performance already without forced cooling after sintering and, therefore, the fatigue strength of this grade is quite well documented in the as-sintered condition. Since the high strength level after sintering is caused by a partially martensitic microstructure, it is the aim of the present study to investigate the possible improvements of quench and temper treatments on the fatigue strength. Extensive plane bending fatigue tests were carried out. In the as-sintered condition the fully reversed endurance limit of smooth specimens increases progressively with density. A pronounced amplitude drop with increasing mean stress was observed. While martensite-free steels have typical mean stress sensitivities around 0.3, the steel of the present investigation is rather characterized by M = 0.5-0.6. With 0.5 % carbon and 7.0 g/cm(exp3) density a fully reversed bending endurance limit of about 250 N/mm(exp2) is achieved. A quenching and tempering treatment leads to an improvement of about 10 to 15 % in fatigue strength under all conditions tested. From the point of view of production costs, the additional manufacturing steps of austenitising, quenching and tempering plus the increased distortion after heat treatment will often not be balanced by the gain in fatigue strength.


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    Title :

    Effect of quenching and tempering on the fatigue behaviour of FE-1.5Mo-4Ni-2Cu-0.5C


    Contributors:


    Publication date :

    2005


    Size :

    6 Seiten, 7 Bilder, 2 Tabellen, 15 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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