Construction of processing maps with high precision for Ti-10V-2Fe-3Al alloy

Hot deformation behavior of Ti-10V-2Fe-3Al was evaluated with processing maps. Ti-10V-2Fe-3Al is a metastable (3-titanium alloy for aerospace application. In developing the maps, we applied the new friction and thermal correction method found by Li et al. and Mataya et al. to make authentic stress-strain curves. The cases for the as hot-forged Ti-10V-2Fe-3Al alloy and the Ti-10V-2Fe-3Al alloy annealed at β-single phase temperature (950°C) were evaluated in this work. Cylindrical specimens were machined and then compression tests were carried out in the temperature range of 700°C-1000°C and in the strain rate range 0. 001-10s^-1 using a computer-aided hot forging simulator (Thermec Master Z). Micro-structure of as-hot forged specimen exhibited a duplex α + β structure. Microstructures of the sample after compression below the β-transus showed equiaxed α+β structure. On the other hand,microstructures after compression at and above the β-transus revealed the almost fully mar-tensite structure especially at higher strain more than 1s^-1. There was a difference in the peaks in power dissipation maps and the regions in instability maps before and after compensation. Comparing the compressed microstuructures and the processing maps, it was found that the deformation is dominated by dynamic recovery or continuous dynamic recrystallization.