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  • Fracture toughness of nitrided layers = Lomna žilavost nitriranih plasti
    Leskovšek, Vojteh ...
    Nitriding and nitrocarburising treatments are established methods of improving the wear performance of tool and die steels. However, our understanding of the relationship between nitriding process ... parameters, and microstructure and fracture behaviour of the surface layers is far from complete. Vickers hardness indentations generate radial fractures in brittle surface layers, and it has been shown that the length of these cracks can be used to provide valuable information about the fracture toughness of these layers. This paper describes an investigation of the application of indentation fracture testing to nitrided and nitrocarburized H11 hot work tool steel. The results suggest that where a sufficiently thick compound layer has formed, this method has the potential to be applied as a pseudo non-destructive method of monitoring the fracture properties of treated surfaces on actual tool parts. However, the validity of the method appears to be a function of the presence and thickness of the compound layer, and possibly the mechanical properties of the diffusion layer. The effect of such factors has not been quantified and further work is required to establish the sensitivity of the method for fracture toughness calculations.
    Source: Program in knjiga povzetkov = Program and book of abstracts (Str. 82)
    Type of material - conference contribution
    Publish date - 2009
    Language - english, slovenian
    COBISS.SI-ID - 787626

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