Estimation of the α/β region in phase diagrams and mechanical properties with heat treatment temperature in Ti-6242 alloy

This study investigates the influence of solution heat treatment temperature on the α phase fraction and resulting mechanical properties of Ti-6242 alloy. The β-transus temperature was accurately determined by differential scanning calorimetry (DSC) and validated through microstructural analysis of specimens heat-treated between 952 °C and 1000 °C. This dual approach confirmed the reliability of the DSC measurement technique. The microstructural data were then used to refine a phase equilibrium diagram using Thermo-Calc software, enhancing its predictive accuracy. It is also examined the effects of different cooling rates (water quenching vs. air cooling) on the α phase fraction and the subsequent microstructural evolution after aging. The correlation between the α phase fraction, resultant microstructures, and mechanical properties, such as strength and ductility, was systematically analyzed.