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

摘要

In this study, hot workability of Ti-35V-15Cr-0.3Si-0.1C alloy is investigated in temperature range of 900-1150 degrees C and strain rate range of 0.01-10 s(-1) by 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 beta-Ti alloys, which can be attributed to the effect of titanium carbides by a 'particle stimulated nucleation' mechanism. Higher temperature, lower strain rate are helpful for breaking down the carbides and improving the workability. But deforming above 1100 degrees 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 degrees C/0.01-0.1 s(-1).