mst 2018 4 9

Two phase (α+β) Titanium (Ti) alloys are attractive candidates in the aerospace industry due to their high specific strength and excellent corrosion resistance. However, their susceptibility to contaminations in the molten state necessitates use of solid state processing methods, such as hot deformation process. During this processes, dynamic recrystallization (DRX) takes place in the (α+β) regime. Here, a two phase crystal plasticity finite element (CPFE) framework has been developed to predict stress strain behavior as well as texture evolution during deformation process in Ti-6Al-4V alloys at elevated temperature. The framework calibrates slip system parameters and elastic properties from both α and β phases under varying temperature and strain rate conditions. Hot compression experiments were conducted to validate the model, showing good agreement with experimental results for stress-strain behavior and texture evolution. This study highlights the importance of quantifying the kinetics of DRX in titanium alloys during hot deformation processing in order to better predict mechanical responses.