Analytical modeling of hot behavior of Ti-6Al-4V alloy at large strain

Gnofam Jacques Tchein (1, 2) , Dimitri Jacquin (2) , Egoitz Aldanondo , Dominique Coupard (2) , Esther Gutierrez-Orrantia (1) , Franck Girot Mata (1) , Eric Lacoste (2)

1 UPV / EHU - University of the Basque Country = Euskal Herriko Unibertsitatea
2 I2M - Institut de Mécanique et d'Ingénierie de Bordeaux

Hot deformation behavior of the Ti-6Al-4V alloy is studied through hot torsion tests. Cylindrical samples are twisted at different strain rates and temperatures in the β phase domain. The recorded torque vs twisting angle data are converted to strain vs stress data using the appropriate methods. All the flow curves obtained are characteristic of continuous dynamic recrystallization. The flow stresses exhibit rapid growth to reach a single maximum followed by a decrease and a steady-state regime. The influence of strain rate and temperature is taken into account. An analytical model is proposed, which gives accurate flow curves for the Ti-6Al-4V alloy for processing temperatures between 1000°C and 1100°C and strain rates between 0.01/s and 1/s. The model is validated by further experimental tests.

Mots clés: Large strain; Hot behavior; Ti-6Al-4V alloy; Flow stress; Analytical behavior law; Torsion test

Domaines: Sciences de l'ingénieur [physics]

Gnofam Jacques Tchein, Dimitri Jacquin, Egoitz Aldanondo, Dominique Coupard, Esther Gutierrez-Orrantia, et al.. Analytical modeling of hot behavior of Ti-6Al-4V alloy at large strain. Materials & Design, 2019, 161, pp.114-123. ⟨hal-02353900⟩