A strategy to improve the work-hardening behavior of Ti–6Al–4V parts produced by additive manufacturing. Issue 3 (4th May 2017)

• Record Type: Journal Article
• Authors: de Formanoir, Charlotte; Brulard, Alice; Vivès, Solange; Martin, Guilhem; Prima, Frédéric; Michotte, Sébastien; Rivière, Edouard; Dolimont, Adrien; Godet, Stéphane
• Is Part Of: Materials research letters. Volume 5:Issue 3(2017)
• Page Start: 201
• Page End: 208
• Publication Date: 2017-05-04
• Subjects: Additive manufacturing -- Ti alloys -- work-hardening -- dual phases; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2016.1245681
• Languages: English
• ISSNs: 2166-3831

Abstract

ABSTRACT: 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. GRAPHICAL ABSTRACT: IMPACT STATEMENT Innovative heat treatments leading to α + α ′ dual-phase microstructures are developed on Ti–6Al–4V parts produced by additive manufacturing. They lead to unprecedented work-hardening capabilities for this alloy.