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Article

Titre: Transformation kinetics and microstructures of Ti17 titanium alloy during continuous cooling
Auteur(s): Julien Da Costa Teixeira, Benoit Appolaire, Elisabeth Aeby-Gautier, Sabine Denis, Georges Cailletaud et Nadine Spath
Journal: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Année: 2007
Volume: 448
Issue: 1-2
Pages: 135-145
DOI: 10.1016/j.msea.2006.10.024
ISSN: 0921-5093
Résumé: We have investigated the microstructure evolutions in the Ti17 near beta titanium alloy during heat treatments. The phase transformation has first been studied experimentally by combining X-ray diffraction analysis, electrical resistivity and microscopy observations. From a series of isothermal treatments. a IT diauram has been determined, which takes into account the different morphologies. Then, a Johnson-Mehl-Avrami-Kolmogorov (JMAK) model has been successfully used to describe the phase transformation kinetics during either isothermal or cooling treatments. Finally, the coupling of the JMAK model to the finite element software ZeBuLoN allowed us to investigate the evolution of the spatial distribution of the different morphologies during the cooling of an aircraft engine shaft disk after forging. (c) 2006 Elsevier B.V. All rights reserved.
Projet: Département SI2M : Microstructures et Contraintes

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