Effect of Quench Delay on Subsurface Integrity During Machining of Titanium Alloy Ti6Al4V

Machining of titanium alloys generates enormous amount of heat at the chip-tool interface which leads to poor machinability. The current research investigates the effect of change in alpha and transformed beta phase resulting from different delays during quenching at subsurface level during machining. The change in subsurface deformation was analyzed based on various output response measured such as deformed depth, shear strain in deformed grains, micro-hardness and surface finish, using optical microscopy and SEM. The deformation induced damage detected near the machined edge due to microstructural restructuring was correlated with chip microstructure.