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- W67441983 abstract "ABSTRACT Toughness being usually assessed by transverse rupture testing, a fracture mechanical discussion is given of flaw-induced rupture in semi-brittle materials. Fracture toughness data for high speed steels and hard metals are reviewed. Typical flaws acting as fracture sources in hard metals are pores, inclusions, and eta phase regions. In high speed steels, critical flaws form by subcritical growth of cracks in the stringers. This explains the strong directionality of rupture strength, its dependence on hot reduction, and its absence in powder metallurgy materials. The complex of properties which determines the ‘toughness’ of a cutting edge is distinguished as ‘microtoughness’ from the ‘macrotoughness’ reflected in the transverse rupture test. Its most important aspect is the nature of the nucleation sites for fracture in extremely small stressed volumes. These are certainly not the coarse defects revealed by the transverse rupture test, but rupture experiments do indicate that microfracture may be caused by debonding at carbide-carbide or carbide-matrix interfaces. The stepping stones for an understanding of microtoughness are discussed." @default.
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- W67441983 date "1983-01-01" @default.
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- W67441983 title "Toughness in High Speed Steels and Hard Metals" @default.
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- W67441983 doi "https://doi.org/10.1016/b978-0-08-029358-5.50014-8" @default.
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