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Microstructure Evolution during Multiaxial Processing of TA6V

Abstract : Subtransus multiaxial hot forging of α+β Ti-6Al-4V (TA6V) titanium alloy with a β-transformed microstructure aims at obtaining an equiaxed microstructure through α phase globularization. The activation of mechanisms involved in microstructural evolution, such as globularization, depends on parameters such as time, temperature, strain and strain rate. It is also sensitive to the crystallographic orientation of α-lamellae. As a result, multiaxial processing of titanium alloys leads to significant microstructural gradients depending on thermomechanical conditions and initial microstructure. In this study, we focused on the effect of complex thermomechanical paths on microstructural evolutions. Thanks to the MaxStrain Gleeble device, we were able to reproduce such thermomechanical treatments to β-transformed TA6V samples. Stress strain fields obtained with finite element modelling of the MaxStrain test were compared to experimental microstructure gradients. This experimental method offers the opportunity to get closer to industrial open die forging conditions.
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https://hal-cnrs.archives-ouvertes.fr/hal-03863836
Contributor : Jean-Sébastien LECOMTE Connect in order to contact the contributor
Submitted on : Monday, November 21, 2022 - 3:12:19 PM
Last modification on : Monday, November 28, 2022 - 10:55:57 AM

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Margaux Saint Jalme, Christophe Desrayaud, Julien Favre, D. Fabrègue, Sylvain Dancette, et al.. Microstructure Evolution during Multiaxial Processing of TA6V. Materials Science Forum, 2021, 1016, pp.1211-1217. ⟨10.4028/www.scientific.net/MSF.1016.1211⟩. ⟨hal-03863836⟩

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