WC-Co Carbide Bits Failure in Coalfield Application

WC-Co cemented carbides bits has unique combination of hardness and toughness makes it especially suitable for wear resistant parts of tools for rock drilling. When the failures of WC-Co cemented carbides bits of cutters used in coalfield were analysed carefully by scanning electron microscopy, it was suggested that bending rupture, abrasion and cracking were the main types of failure of WC-Co bits.



Based on the fractography, it is indicated that the causes of the failures of the bits are impact load stress which may reach or even exceed the transverse rupture strength of WC-Co alloys, abrasive wear, surface impact fatigue and thermal fatigue. In accordance with these causes, some methods like adjustment of alloy composition, changing particle size to enhance the properties of the alloy are suggested to prolong the lifetime of cutters.


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