Investigation of the mechanical behaviour of Ti-6Al-4V alloy under hot forming conditions: Experiment and modelling

摘要

The present investigation aims at evaluating and understanding the formability of Ti-6Al-4V alloy under hot forming conditions (650 ℃ ≤ T ≤ 750 ℃). To fulfil these objectives, it was necessary to establish accurate material models and predict microscopic material evolution depending on temperature and strain rate. Two kinds of microstructure were investigated, the first one considers a conventional grain size of the α-phase (3 μm) whereas a combined forging-rolling process is used to laborate the second one and allows to obtain a very fine grain of the a-phase (0.5 um). In this research work, we propose to investigate the capabilities of the titanium alloy under forming conditions quite different from those usually considered in superplastic forming process (lower temperatures and higher strain rates).