Corrosion Behaviour and Microhardness during Dry and Flood Milling of Ti-6Al-4V Alloy

Abstract

Milling process is the removal of unwanted materials so as to produce the required shape. The purpose of this study was to investigate the effect of milling process parameters and the cooling technique on corrosion behaviour and microhardness of TI-6AL-4V. Milling of Ti-6Al-4V was carried out using tungsten carbide cutting tool while varying spindle speed (120,150, and 180 rev/min), depth of cut (1, 1.5 and 2 mm) and the feed rate remained unchanged at 4.6 mm/min. Subsequent to milling, characterization of subsurface microhardness and corrosion behaviour was conducted. It was found that varying spindle speed and depth of cut had an impact on microhardness. Furthermore, it was noticed that the type of milling condition (flood and dry milling) affected the subsurface microhardness and the corrosion behavior. The corrosion resistance of the milled surface was generated at 180 rev/min and 150 rev/min for the dry and flood milling respectively. Furthermore, the most corrosion resistance was obtained at 2 mm and 1.5 mm depth of cut during dry and flood milling respectively.