Abstract
Cutting performance and failure mechanisms of graphene nano-platelets (GNPs) reinforced ceramic cutting tool ATG (short for Al2O3/Ti(C,N)/GNPs) in continuous dry turning of Inconel 718 up to a cutting speed of 500 m/min were investigated in comparison with those of commercial Sialon tool KY1540. The results show that ATG tool shows similar cutting performance with KY1540 tool at the speed range of 150–300 m/min, but greatly outperforms KY1540 when the cutting speed range of 400–500 m/min for higher hardness, wear resistance, chemical inertness and fracture toughness. Flank wear, notch wear, chipping and flaking are the reasons for tool failure of ATG. The wear modes are related to cutting speed, and adhesion wear is found to be the dominant failure mechanism of ATG. It is believed that GNPs play a significant role in improving mechanical properties and tribological properties which contributed to excellent resistance to abrasive wear and fracture. Turning Inconel 718 in dry and high speed via using ATG ceramic tool is an efficient and eco-friendly method.
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