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A strategy to improve the work-hardening behavior of Ti–6Al–4V parts produced by additive manufacturing

par De Formanoir De La Caze, Charlotte ;Brulard, Alice;Vives, Solange ;Martin, Guilhem;Prima, Frédéric;Michotte, Sébastien;Rivière, Edouard;Dolimont, Adrien;Godet, Stéphane
Référence Research Letters in Materials Science, 5, 3, page (201-208)
Publication Publié, 2017-05

Article révisé par les pairs

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Résumé :

To improve the mechanical properties of additively manufactured parts, specific heat treatments must be developed. Annealing of electron beam-melted Ti–6Al–4V was performed at sub-transus temperatures and followed by water quenching. Such treatments generate an α + α′ dual-phase microstructure. Microstructural and mechanical characterizations revealed that the heat-treated specimens show a broad range of tensile properties, depending on the fraction of martensite. The specimens treated between 850°C and 920°C exhibit an increase in strength and ductility, which is related to a remarkable hardening behavior. Work-hardening is attributed to kinematic hardening arising from the mechanical contrast between the α and α′ phases.