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

Vincent Velay (1) , H. Matsumoto (2) , L. Sasaki (1) , Vanessa Vidal (1)

1 ICA - Institut Clément Ader
2 UKK - University of Kitakyushu

The present investigation aims at evaluating and understanding the formability of Ti-6Al-4V alloy under hot forming conditions (650 degrees C T 750 degrees C). 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 -phase (3 mu m) whereas a combined forging-rolling process is used to elaborate the second one and allows to obtain a very fine grain of the -phase (0.5 mu m). 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).

Mots clés: Modellierungsverhalten; Warmumformung; Mechanisches Verhalten; Titanlegierungen

Mots clés: behaviour modelling; hot forming; Mechanical behaviour; titanium alloys

Domaines: Sciences de l'ingénieur [physics]; Mécanique des matériaux [physics.class-ph]

Vincent Velay, H. Matsumoto, L. Sasaki, Vanessa Vidal. Investigation of the mechanical behaviour of Ti-6Al-4V alloy under hot forming conditions: Experiment and modelling. Materials Science and Engineering Technology / Materialwissenschaft und Werkstofftechnik, 2014, 45 (9), p. 847-853. ⟨10.1002/mawe.201400293⟩. ⟨hal-01611987⟩