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  • Microstructure and origin of hot-work tool steel fracture toughness deviation
    Podgornik, Bojan, doktor strojništva ; Leskovšek, Vojteh
    Dies and tools used in hot metal forming are exposed to elevated temperatures and high contact pressures, and therefore to wear and fatigue. Fracture toughness is thus one of the main material ... properties used when selecting and optimizing heat treatment of tools. However, fracture toughness data alone is not sufficient and need to be supported by other material properties and features. The aim of the present research work was to correlate fracture toughness properties of hot-work tool steel, especially its variation to the local microstructure, microhardness, and composition and to establish methodology for proper evaluation of tool steel's fracture toughness. Research was performed on H11-type hot-work tool steel specimens, heat treated under the same conditions but displaying greatly different fracture toughness. Results show that the pressure of any weak point, either in a form of non-metallic inclusions and/or large undissolved eutectic carbide clusters, located in the region of positive segregation with high microhardness will lead to considerable reduction in fracture toughness.
    Source: Metallurgical and materials transactions. A, Physical metallurgy and materials science. - ISSN 1073-5623 (Vol. 44, iss. 13, Dec. 2013, str. 5694-5702)
    Type of material - article, component part ; adult, serious
    Publish date - 2013
    Language - english
    COBISS.SI-ID - 1001898

    Link(s):

    https://link.springer.com/content/pdf/10.1007%2Fs11661-013-1921-6.pdf
    DOI

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