JFE Steel has developed a new powder metallurgical process named die-lubricated warm compaction method for producing high-density sintered parts using premixed steel powder containing only small amount of internal lubricant. In this method, a newly developed spraying equipment precisely controls the amount of lubricant applied over the die wall. The sintered and bright-quenched compacts were prepared by this method using partially alloyed steel powder, KIP SIGMALOY 415S, containing 4 mass% Ni, 1.5 mass% Cu, and 0.5 mass% Mo. They gave a density as high as 7.5 Mg/m3 and rotating bending fatigue strengths of 450 MPa and 470 MPa with carbon contents of 0.52 mass% and 0.92 mass% respectively. The density and fatigue strength were superior to those obtained by the conventional double-pressing and double-sintering method. Presumably, the fatigue strength was enhanced by increasing the carbon content because the amount of retained austenite was increased. (Engl. translation from JFE GIHO, 2004, No.4, p.70-76, (jap.))


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    Title :

    Steel powder and die-lubricated warm compaction for automative sintered parts with high density and excellent fatigue property


    Additional title:

    Stahlpulver und das Heißpressverfahren für die gesinterten Fahrzeugteile mit hoher Dichte und mit ausgezeichneten Ermüdungseigenschaften


    Contributors:

    Published in:

    Publication date :

    2004


    Size :

    8 Seiten, 10 Bilder, 3 Tabellen, 16 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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