Abstract
To verify the feasibility of preparing fine equiaxed microstructure of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy through hot deformation of martensite, the isothermal compression tests with three temperatures 600 , 700 , 800 °C and three strain levels 0.7, 1.1, 1.8 were conducted and its concomitant dynamic recrystallization behavior is studied. As deformed at 700 and 800 °C, the constitutive curves reach the peak stress rapidly and then exhibit continuous softening behavior caused by dynamic recovery and recrystallization until a steady state is reached. The Arrhenius-type hot deformation kinetics model and an Avrami-type dynamic recrystallization kinetics model of martensitic microstructure are built, which generally exhibit satisfactory prediction performance. For the specimen deformed to the strain of 1.8 at 800 °C, full recrystallized microstructure was realized, and the weighted average diameter of α grains is only 1.1 μm. Its compressive yield strength and plasticity reach 1188 MPa and 39.7%, respectively, which shows marvelous high product of strength and plasticity as 47.2 GPa%. To sum up, it is an effective way to prepare fine equiaxed microstructure through hot deformation of martensite. However, the hot deformation process should be precisely controlled to suppress the coarsening of recrystallized grains.
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