Grain refinement in cast titanium 6-aluminium 4-vanadium by hydrogenation, deformation and recrystallisation

• Main Author: Vilane, Velile Nicholine
• Other Authors: Knutsen, Robert D
• Format: Dissertation
• Language: English
• Published: University of Cape Town 2014
• Subjects: Engineering
• Online Access: http://hdl.handle.net/11427/10578

Includes bibliographical references. === Wrought Ti6Al4V has attractive mechanical properties but its usage is limited to highend aerospace applications because it is costly to machine components from wrought stock. Investment casting is an alternative component manufacturing route but cast components have inferior mechanical properties to their wrought counterparts. Therefore, microstructure refinement is required in order to optimize these mechanical properties. The aim of this work is to refine the as-cast Ti6Al4V microstructure by reducing its prior beta grain sizes and changing its Widmanstatten morphology. Refinement was achieved through combining thermohydrogen processing (THP) and hot deformation.