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Communication Dans Un Congrès Année : 2021

Effect of microstructure on the formability of Ti21S alloy

Résumé

Titanium alloys find a wide range of uses, especially in the aeronautic industry because of a combination of favorable specifications in terms of strength-to-weight ratio, corrosion resistance and performance at high temperature. If many works are interested in mechanical properties, as well as microstructure, few of them studied the effect of microstructure on formability. The aim of this work is to study the influence of the microstructure on the formability of β metastable titanium alloys (Ti21S) which are increasingly used in aeronautical applications. For this purpose, two different heat treatments are performed on Ti21S alloy in order to propose different microstructures. Based on uniaxial tensile tests, the elastoplastic hardening behavior and the limit strain in the uniaxial tension state are obtained and allow to determine one point of the forming limit curve (FLC). From these experimental observations, it is shown that the microstructure has an important effect on the formability: precipitation of α phase reduces the formability in comparison with full β phase microstructure. Finally, a finite element M-K model is used and calibrated to predict the whole FLC for the different investigated microstructures.

Dates et versions

hal-03417257 , version 1 (05-11-2021)

Identifiants

Citer

Cai Hu, Lionel Leotoing, Philippe Castany, Dominique Guines, Thierry Gloriant. Effect of microstructure on the formability of Ti21S alloy. 24th International ESAFORM Conference on Material Forming, 2021, Liege, France. ⟨10.25518/esaform21.1630⟩. ⟨hal-03417257⟩
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