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Exploiting Metastability and Lattice Defects for Microstructural Engineering of Selective Laser Melted Ti-6Al-4V

Haubrich, Jan and Gussone, Joachim and Barriobero-Vila, Pere and Kürnsteiner, Philipp and Jägle, Eric A. and Raabe, Dierk and Schell, Norbert and Requena, Guillermo (2019) Exploiting Metastability and Lattice Defects for Microstructural Engineering of Selective Laser Melted Ti-6Al-4V. EUROMAT 2019, 02.-06. Sept. 2019, Stockholm, Schweden.

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Introduction Additive manufacturing (AM) is a technology of enormous potential, yet also of high complexity. Understanding and exploiting AM requires very interdisciplinary research efforts since material, processing, AM-design and engineering, build strategies, post-treatments and surface finishing are all interdependent. Particularly for class-one components in aerospace applications, achieving high material quality and performance in a robust AM process such as Selective Laser Melting (SLM) is a major hurdle. For the development of a manufacturing chain for a Ti-6Al-4V rocket engine turbo-pump impeller, different SLM processing and post-heat-treatment strategies for Ti-6Al-4V including intensified intrinsic heat treatment and in situ high-temperature build space heating to obtain stabilized -microstructures with fine -particles and films have been studied. Moreover, the transfer from coupon level to a complex part will be discussed. Methods In this study a SLM Solutions 280HL machine with a custom high-temperature build space heating was used. Results Heat treatments act to stabilize the initial as-built microstructures by decomposition of the acicular martensite in conjunction with pronounced element partitioning. New -phase nucleates at prior lattice defects in the as-built microstructures, leading to favorable materials properties. The interplay between SLM process parameters and the part geometry was studied using High Energy X-ray Diffraction in a section of an impeller manufactured with the optimized SLM bulk parameters. A mapping of the phase distribution shows that the local thermal history differs strongly in filigree and more massive sections and leads to substantial differences in the obtained microstructures and porosities compared to coupon specimen. Conclusions The process parameters and heat treatments were successfully optimized with coupon specimen to achieve stabilized -microstructures allowing for high strength and ductility. When used for manufacturing actual parts, however, the local geometry plays a key role: Results from studies carried out with cubes or cylinders can differ substantially from those in complex parts despite identical SLM parameters.

Item URL in elib:https://elib.dlr.de/130460/
Document Type:Conference or Workshop Item (Speech)
Title:Exploiting Metastability and Lattice Defects for Microstructural Engineering of Selective Laser Melted Ti-6Al-4V
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Haubrich, JanJan.Haubrich (at) dlr.deUNSPECIFIED
Gussone, JoachimJoachim.Gussone (at) dlr.deUNSPECIFIED
Barriobero-Vila, Perepere.barrioberovila (at) dlr.deUNSPECIFIED
Kürnsteiner, PhilippMPIE DüsseldorfUNSPECIFIED
Jägle, Eric A.MPIE DüsseldorfUNSPECIFIED
Raabe, DierkMPIE, DüsseldorfUNSPECIFIED
Schell, NorbertHZG, GeesthachtUNSPECIFIED
Requena, GuillermoGuillermo.Requena (at) dlr.deUNSPECIFIED
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Event Title:EUROMAT 2019
Event Location:Stockholm, Schweden
Event Type:international Conference
Event Dates:02.-06. Sept. 2019
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: Haubrich, Jan
Deposited On:14 Nov 2019 17:28
Last Modified:14 Nov 2019 17:28

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