Solid-State Phase Transformations in Thermally Treated Ti-6Al-4V Alloy Fabricated via Laser Powder Bed Fusion

Solid-State Phase Transformations in Thermally Treated Ti-6Al-4V Alloy Fabricated via Laser Powder Bed Fusion

Laser Powder Bed Fusion (LPBF) technology was used to produce samples based on the Ti-6Al-4V alloy for biomedical applications. Solid-state phase transformations induced by thermal treatments were studied by neutron diffraction (ND), X-ray diffraction (XRD), scanning transmission electron microscopy...

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Bibliographic Details
Published in:Materials 2019-09, Vol.12 (18), p.2876
Main Authors: Mengucci, Paolo, Santecchia, Eleonora, Gatto, Andrea, Bassoli, Elena, Sola, Antonella, Sciancalepore, Corrado, Rutkowski, Bogdan, Barucca, Gianni
Format: Article
Language:eng
Subjects:
Additive manufacturing
Beta phase
Biomedical materials
Cooling
Defect annealing
Dentistry
Ductility
energy-dispersive spectroscopy
Heat treating
Heat treatment
Investigations
Ion beams
Lasers
Martensite
Microstructure
Neutron diffraction
phase transformations
Phase transitions
Powder beds
Scanning transmission electron microscopy
Software
Solid state
Thermal transformations
thermal treatments
Ti alloys
Titanium alloys
Titanium base alloys
Transmission electron microscopy
X-ray diffraction
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Summary:Laser Powder Bed Fusion (LPBF) technology was used to produce samples based on the Ti-6Al-4V alloy for biomedical applications. Solid-state phase transformations induced by thermal treatments were studied by neutron diffraction (ND), X-ray diffraction (XRD), scanning transmission electron microscopy (STEM) and energy-dispersive spectroscopy (EDS). Although, ND analysis is rather uncommon in such studies, this technique allowed evidencing the presence of retained β in α' martensite of the as-produced (#AP) sample. The retained β was not detectable by XRD analysis, nor by STEM observations. Martensite contains a high number of defects, mainly dislocations, that anneal during the thermal treatment. Element diffusion and partitioning are the main mechanisms in the α ↔ β transformation that causes lattice expansion during heating and determines the final shape and size of phases. The retained β phase plays a key role in the α' → β transformation kinetics.
ISSN:1996-1944
1996-1944