Abstract
The effects of microstructure, specimen preparation and test procedure on the hardness and indentation fracture of commercial WC-Co alloys (4.5–20wt.%Co) fabricated by two companies were investigated. The measured hardness was in good accord with that calculated from the Lee and Gurland relations. The Palmqvist fracture toughness G Is was proportional to the binder mean free spacing; moreover, G Is −1 increased linearly with increasing hardness. By considering the variation in the bulk fracture toughness G Ic (and of G Is) with hardness, the two are related through G Ic = C exp(− βG Is −1) Only a little difference in the hardness and G Is values occurred for the two material sources, specimen men preparation and test procedures considered.
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