Modeling of the phase transformations in near-β titanium alloys during the cooling after forging

A complete modeling of the phase transformation during the cooling following the forging has been carried out for near-β titanium alloys. To that aim, we have improved a model predicting the influence of the deformation of the β phase on the α phase precipitation during isothermal treatments, by extending its range of application to the case of cooling treatments. In particular, the precipitation of the intragranular morphology α WI has been introduced. We have proceeded step by step: calculations of heat treatments without any previous forging have first been performed. Then, the influence of the initial β grain size have been studied. Finally, the influence of a previous deformation coming from the forging has been investigated. At each step, the calculations have been compared to some experiments, showing an good overall agreement.