• Amin, Akm Nurul
• Patwari, Anayet U.
• Alam, S.

Abstract

Aerospace alloy Ti-6Al-4V is classified as “difficult-to-cut ” material. But with their low mass, high strength, and excellent resistance to corrosion, titanium alloys solve many engineering challenges. In this study, high speed end milling of Ti-6Al-4V was applied as a potential machining technique for obtaining better surface finish using small diameter tools applying high rpm to facilitate the application of micro-meter level feed and depth of cut to ensure super finishing that could avoid the need of further grinding and polishing. Machining was performed on a Vertical Machining Centre (VMC) with a high speed attachment (HES 510), using cutting speed, depth of cut, and feed as machining variables. Three level full factorial designs were followed for machining operations. Minimum average surface roughness (Ra) value of 0.13 µm was obtained which is within the acceptable range of avoiding grinding and polishing operations. Surface texture was investigated and no alternation in microstructures was observed and there was no presence of white layer on the machined surface. A strain hardened zone was observed beneath the machined surface with a small temperature-softened zone just below the machined surface.

Topics

• impedance spectroscopy
• microstructure
• surface
• corrosion
• grinding
• milling
• strength
• texture
• titanium
• titanium alloy
• polishing