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Inducing Stable α + β Microstructures during Selective Laser Melting of Ti-6Al-4V Using Intensified Intrinsic Heat Treatments

Barriobero-Vila, Pere and Gussone, Joachim and Haubrich, Jan and Sandlöbes, Stefanie and Da Silva, Julio and Cloetens, Peter and Schell, Norbert and Requena, Guillermo (2017) Inducing Stable α + β Microstructures during Selective Laser Melting of Ti-6Al-4V Using Intensified Intrinsic Heat Treatments. Materials, 10 (3), pp. 1-14. Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/ma10030268 ISSN 1996-1944

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Official URL: http://dx.doi.org/10.3390/ma10030268


Selective laser melting is a promising powder-bed-based additive manufacturing technique for titanium alloys: near net-shaped metallic components can be produced with high resource-efficiency and cost savings. For the most commercialized titanium alloy, namely Ti-6Al-4V, the complicated thermal profile of selective laser melting manufacturing (sharp cycles of steep heating and cooling rates) usually hinders manufacturing of components in a one-step process owing to the formation of brittle martensitic microstructures unsuitable for structural applications. In this work, an intensified intrinsic heat treatment is applied during selective laser melting of Ti-6Al-4V powder using a scanning strategy that combines porosity-optimized processing with a very tight hatch distance. Extensive martensite decomposition providing a uniform, fine lamellar α + β microstructure is obtained along the building direction. Moreover, structural evidence of the formation of the intermetallic α2-Ti3Al phase is provided. Variations in the lattice parameter of β serve as an indicator of the microstructural degree of stabilization. Interconnected 3D networks of β are generated in regions highly affected by the intensified intrinsic heat treatment applied. The results obtained reflect a contribution towards simultaneous selective laser melting-manufacturing and heat treatment for fabrication of Ti-6Al-4V parts.

Item URL in elib:https://elib.dlr.de/115700/
Document Type:Article
Title:Inducing Stable α + β Microstructures during Selective Laser Melting of Ti-6Al-4V Using Intensified Intrinsic Heat Treatments
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Barriobero-Vila, Perepere.barrioberovila (at) dlr.deUNSPECIFIED
Gussone, Joachimjoachim.gussone (at) dlr.deUNSPECIFIED
Haubrich, Janjan.haubrich (at) dlr.deUNSPECIFIED
Requena, Guillermoguillermo.requena (at) dlr.deUNSPECIFIED
Date:January 2017
Journal or Publication Title:Materials
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.3390/ma10030268
Page Range:pp. 1-14
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Keywords:additive manufacturing; selective laser melting; intrinsic heat treatment; titanium alloys; metastable phases; phase transformations; martensite decomposition; element partitioning; high energy synchrotron X-ray diffraction; synchrotron holographic X-ray computed tomography
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Metallic Structures and Hybrid Material Systems
Deposited By: Barriobero Vila, Pere
Deposited On:21 Nov 2017 14:30
Last Modified:14 Dec 2019 04:25

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