Abstract
Commercial quality carbide inserts coated with TiC were assessed in high speed machining trials on EN24. Their wear behaviour was studied by monitoring flank and crater wear throughout the machining operation and by systematic examination of worn inserts using optical and scanning microscopy. The cutting performance is shown to be controlled by wear on the flank face which initially is predominantly of an abrasive type, but is superseded on coating breakthrough by a combined diffusion/abrasion mechanism. On the rake face coating breakdown is enhanced by thermal cracking which aids in the removal of small regions of the coating allowing direct substrate-metal interaction which in turn enhances diffusion wear.
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