Hot workability of burn resistant Ti-35V-15Cr-0.3Si-0.1C alloy

In this study, hot workability of Ti-35V-15Cr-0.3Si-0.1C alloy is investigated in the temperature range of 900-1150°C and strain rate range of 0.01-10 s^-1 using processing maps. In the maps, the stability domain displays the feature of dynamic recrystallisation and dynamic recovery. The fraction of recrystallisation in this alloy is much larger than that in other β-Ti alloys, which can be attributed to the effect of titanium carbides by a 'particle stimulated nucleation' mechanism. Higher temperature and lower strain rate are helpful for breaking down the carbides and improving the workability. However, deforming >1100°C would result in grain coarsening. In instability domain, the occurrence of flow localisation, shear bands and cracking is discussed. The optimised processing window is in 1050-1100°C/0.01-0.1 s^-1.