Analysis of Chip Morphology in Drilling Ti-6Al-4V by Using Graphene Oxide Nanofluids

Abstract

Titanium and its alloys have been widely used in various areas due to their superior mechanical properties. However, Titanium and its alloys have low elastic modulus and low thermal conductivity, which lead to extreme high temperature during the machining process and result in poor workpiece quality. The main objective of this paper is to investigate the effectiveness of graphene oxide (GO) nanofluids in drilling process of Ti-6Al-4V by using tungsten carbide tools. The spiral chips were obtained when GO nanofluid was used and squeezed string chips were obtained when conventional coolant was applied. By analysing the back surface of the chips, it was found that the high coolant pressure resulted in better chip formation, which had less scratch and plunking. In addition, by using higher concentration of GO nanofluids, the adhesion phenomenon was found significantly reduced.