A novel cyclic thermal treatment for enhanced globularisation kinetics in Ti-6Al-4V alloy: Experimental, constitutive and FE based analyses

Secondary hot-working on dual phase titanium alloys are essential for microstructural modification to tailor mechanical properties, which is typically challenging due a narrow available processing window, especially during industrial scale manufacturing. Poor workability, strain induced porosity and adiabatic temperature rise in α + β region (i.e., sub-transus) some of the main challenges faced. Cyclic thermal treatment (CTT) an emerging technology showing potentials microstructure globularisation) Ti‐6Al‐4V with significantly reduced work region. This study summarises results CTT investigations conducted wrought alloy subjected various thermo-mechanical conditions develop different initial microstructures. Samples uniform distributions were extracted from pre-forged samples subsequently using both conventional electric furnace slow heating cooling rates), induction faster rates). forged at sub-transus led maximum (i.e. ~100%) globularisation significant coarsening grains, resulting equiaxed bimodal microstructure. On other hand, method has resulted 80% fraction 60% reduction, ~35% those 20% reduction. The mechanisms was dominated by boundary splitting grooving. A Johnson-Mehl-Avarmi-Kolmogorov (JMAK) based model been developed predict evolution grain growth CTT. JMAK then successfully incorporated into DEFORM® software as post-processing user subroutines. predicted Finite Element (FE) simulations shown good convergence towards experimentally measured data following