Indentation Damage in Tungsten Carbide and Tungsten-Titanium Carbide
Tungsten carbide (WC) is the main constituent of cemented carbides used for metal machining and rock drilling. Titanium carbide (TiC) is added to some grades of WC-Co to improve wear resistance in cutting metals. These grades contain both hexagonal WC and cubic (W, Ti)C solid solutions as the principal hard phases. In both applications high stresses and high temperatures are generated locally at the tool surface by contact with asperities or with rock fragments. Under normal rock-drilling conditions the cutting surfaces can reach temperatures up to 400°C1 and temperatures as high as 800°C might be reached with dull bits or under unusually high loads.2 Tool-tip temperatures up to 1000°C3 have been recorded in metal cutting operations.
KeywordsTungsten Carbide Slip Band Titanium Carbide Radial Crack Spherical Indenter
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