Mechanical behavior of a Ti-6Al-4 V titanium alloy with microstructural evolution modeling under hot and superplastic conditions

Abstract : The present work aims at evaluating and understanding the mechanical behavior of a Ti-6Al-4 V alloy under hot and superplastic forming conditions. Tensile tests were performed at temperature range from 650 °C to 950 °C, at strain rates between 10-2 s-1 and 10-4 s-1. Three equiaxed microstructures, each characterized by a different starting grain size (4.9 μm, 3.0 μm and 0.5 μm), are compared to better understand the microstructural evolutions under hot and superplastic forming conditions and their influence on the mechanical behavior. Hence, an accurate model with microstructural considerations is proposed. The model capabilities consider the grain size evolution that is influenced by the temperature and deformation. The computed flow stresses strongly depend on the strain rate and on the considered initial grain size. Temperature and strain rate conditions may lead to a strain hardening phenomenon in some cases. The comparison between the model response and experiment shows a good agreement for all the tests carried out on Ti-6Al-4 V.
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Article dans une revue
Materials Science and Engineering Technology / Materialwissenschaft und Werkstofftechnik, Wiley-VCH Verlag, 2017, Special Issue: 11th European Conference on Superplastic Forming (EuroSPF) (Selected contributions) 48 (10), p.952-961. 〈10.1002/mawe.201700040〉
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https://hal-mines-albi.archives-ouvertes.fr/hal-01622051
Contributeur : Mines Albi Ecole Nationale Supérieure Des Mines d'Albi-Carmaux <>
Soumis le : mardi 24 octobre 2017 - 08:55:25
Dernière modification le : mardi 19 juin 2018 - 22:28:02

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Marcio Wagner Batista Dos santos, Vincent Velay, Vanessa Vidal, Gérard Bernhart, Gilmar Ferreira Batalha, et al.. Mechanical behavior of a Ti-6Al-4 V titanium alloy with microstructural evolution modeling under hot and superplastic conditions. Materials Science and Engineering Technology / Materialwissenschaft und Werkstofftechnik, Wiley-VCH Verlag, 2017, Special Issue: 11th European Conference on Superplastic Forming (EuroSPF) (Selected contributions) 48 (10), p.952-961. 〈10.1002/mawe.201700040〉. 〈hal-01622051〉

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