Surface Integrity of Ti-6Al-4V Precision Machining Using Coated Carbide Tools Under Dry Cutting Condition

Abstract

Aerospace components from titanium alloys require the greatest reliability and satisfied surface integrity requirement. However, during machining of titanium alloys, the machined surface can be easily damaged because of the difficult-to-machine material and poor machinability. The aims are to investigate the surface integrity of Ti-6 %Al-4 %V precision machining under dry cutting condition. The results showed that the surface roughness values recorded were more affected by feed rate and nose radius geometry. Surface roughness was high value at the first machining followed by decreasing. Work hardening beneath the machined surface caused higher hardness than based material; on the other hand, Changing orientation of microstructure and 2 μm of white layer on the machined surface was found when turning at cutting speed of 30 m/min, feed rate of 0.02 mm/rev, and depth of cut of 0.01 mm.