Maureen is currently pursuing a PhD in Materials Sc. and Eng. at The University of Sheffield focusing on subsurface deformation and microstructure evolution during machining titanium alloys.
The aim is to understand the mechanism of machining-induced plastic deformation, the level of subsurface damage, and optimization of production parameters to reduce the level of damage on machined components in order to improve fatigue life during operation. EBSD is being used to determine twin and intense slip bands operational systems and the influence of crystallographic texture on machining.
Deformation mechanisms involving flow stress in an in-house designed orthogonal rig (by Dr. Luke Marshall) are being investigated.
Different coolant technologies including cryogenic by the use of liquefied industrial gases (Carbon dioxide and liquid nitrogen), Minimum Quantity Lubrication and conventional (flood, high pressure and dry) have been studied. The reason to investigate the effects of different coolant and lubrication mechanisms on the surface and subsurface is to determine the conditions in which less microstructural damage occurred (by taking the heat away from the cutting edge and reducing friction). As features such as slip bands and twins may negatively influence the machined workpiece fatigue life.
The project is a joint collaboration with the Advanced Manufacturing Research Centre with Boeing, Seco Tools and Stryker.