Journal
MATERIALS RESEARCH LETTERS
Volume 5, Issue 3, Pages 201-208Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2016.1245681
Keywords
Additive manufacturing; Ti alloys; work-hardening; dual phases
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Funding
- F.R.I.A. - F.N.R.S.
- 'Investments for the Future' Program [AN-10-LABX-44-01]
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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 alpha + alpha' 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 degrees C and 920 degrees 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 alpha and a alpha' phases.
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