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  • Investigation of die for pressure die-casting of Mg-alloy
    Torkar, Matjaž ; Godec, Matjaž, 1961- ; Lamut, Martin, 1977-
    Investigated was a die for the pressure die-casting of Mg-alloy. Die was made of martensitic chromium hot-work steel grade and the surface was gas nitrided. Due damaged surface the die was removed ... from the production line after 20.000 shots Light microscopy and electron microscopy studies were performed. Mechanical properties as well as fracture toughness of the basic material were determined. Presented are results of the investigations. It was established that the base material properties correspond to declared properties. The corrosion phenomena in the form of pits, were observed on all surfaces of the die. Metallography revealed that nitrided layer consisted onlyof diffusion layer, without a [gamma]' compound layer. The depth of the pits was limited to the thickness of nitrided layer and in the pits the presence of Ca, Cl and S was detected. No cracks were observed in nitrided layer and all edges of pits were rounded. The damages were caused by a combined mechanism of corrosion-erosion. The main reason for the damages were not optimised nitride layer properties.
    Vir: Engineering failure analysis. - ISSN 1350-6307 (Vol. 16, iss. 1, 2009, str. 176-181)
    Vrsta gradiva - članek, sestavni del
    Leto - 2009
    Jezik - angleški
    COBISS.SI-ID - 717482

vir: Engineering failure analysis. - ISSN 1350-6307 (Vol. 16, iss. 1, 2009, str. 176-181)
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