Modeling of Microstructures and Mechanical Properties of α + β Ti Based Alloys

摘要

Titanium alloys have been used in demanding applications such as the chemical industry and aerospace, thanks to their excellent corrosion resistance, low density, and high mechanical strength. There have been many research activities recently on titanium alloys, mainly focusing on experiments. The kinetics of phase transformations and the relationship between the microstructure and the final mechanical properties has not been widely studied by computer modeling so far. In this work, a comprehensive finite element model coupled with thermodynamic calculations has been developed to simulate the microstructure evolution and predict the final mechanical properties resulting from solidification and beta to alpha solid phase transformation. This model can be applied to casting and heat treatment processes. The predictions are validated by comparison with experimental measurements. The results show that this model can accurately predict the microstructure, volume fraction of different phases, and the final yield strength of titanium alloys.