Nitrieren von pulvermetallurgisch hergestellten hochlegierten Kunststoffformenstählen

T. Fuchs, G. Pöckl, J. Mittmannsgruber, R. Schneider

    Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

    Abstract

    Nitriding of high-alloyed tool steels is a special treatment which can lead to complex metallurgical reactions. Easily undesired structural modifications can occur. The produced layers can be very brittle and fail early during operation. One reason for the high brittleness of these layers is the high carbon content, which is displaced during nitriding by the incoming nitrogen and causes segregations at the grain boundaries. These investigations were carried out with the high-alloyed tool steels Böhler M390 (X190CrVMo20-4) [1] and Bodycote MV11K (X260CrVMo26-4) [2]. Both steels are produced via the powder metallurgical route, i.e. the steel melt is atomized into powder, which is hot isostatic pressed into ingots and hot formed to steel bars.When plasma-nitriding with 25 % N2 in the nitriding atmosphere, a network of hard phases is formed at the grain boundaries. Characteristic for this network are high contents of carbon at the former grain boundaries and high contents of nitrogen in the large primary carbides. Different strategies can be applied to influence or avoid the network like structure. Among these are the raising of the nitriding temperature, the reduction of the nitriding time or of the nitrogen content in the nitriding-atmosphere.

    Titel in ÜbersetzungNitriding of powder-metallurgical produced high-alloyed plastic mould steels
    OriginalspracheDeutsch
    Seiten (von - bis)87-93
    Seitenumfang7
    FachzeitschriftHTM - Haerterei-Technische Mitteilungen
    Jahrgang66
    Ausgabenummer2
    PublikationsstatusVeröffentlicht - Apr 2011

    Schlagwörter

    • Böhler M390
    • Bodycote MV11K
    • Carbide-network
    • Plasma-nitriding
    • Plastic mould steels

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