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Ultrafine Fe-Fe2Ti eutectics produced by laser metal deposition: processing and characterization

Theofilatos, Angelos and Rödler, Georg and Haubrich, Jan and Requena, Guillermo and Hecht, U. and Laqua, Romuald and Weisheit, Andreas and Sket, Frederico and Milenkovic, Sridjan and Granasy, Laszlo and Pusztai, Tamas and Rátkai, L. (2018) Ultrafine Fe-Fe2Ti eutectics produced by laser metal deposition: processing and characterization. Material Science and Engineering MSE 2018, Darmstadt.

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Additive manufacturing (AM) presents advantages over the traditional production methods such as the ability to produce near net-shape components with reduced material usage and a weight-optimized component design. Laser-based AM process methods, i.e. Laser Metal Deposition (LMD) and Selective Laser Melting (SLM), provide rapid and directional solidification in the melt pool and hence the possibility to produce ultrafine microstructures. These conditions hold great promise for the production of novel eutectic materials with ultrafine microstructural length scales. Eutectics can benefit immediately and dramatically from rapid solidification, since it has been shown [1, 2] that the reduction of the eutectic spacing leads to increasing the materials strength along with increasing ductility and fracture toughness. In this presentation, we describe our research on Fe-Fe2Ti eutectics produced by Laser Metal Deposition (LMD). We will discuss the effect of process parameters such as Laser scanning velocity and Laser power on the microstructure on distinct length scales, encompassing features such as eutectic grain size, interlayer boundary morphology and eutectic spacing. We will show that the lamellar eutectic consisting of hexagonal Laves-phase Fe2Ti and the BCC a(Fe) can be processed to above 99.8 % density, while reaching lamellar spacing in the range of 50 to 200 nm. Furthermore, mechanical properties will be discussed based on microhardness measurements and in-situ micromechanical testing inside an SEM.

Item URL in elib:https://elib.dlr.de/122504/
Document Type:Conference or Workshop Item (Speech)
Title:Ultrafine Fe-Fe2Ti eutectics produced by laser metal deposition: processing and characterization
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Theofilatos, AngelosACCESS eV, AachenUNSPECIFIED
Rödler, GeorgFh ILT, AachenUNSPECIFIED
Haubrich, JanJan.Haubrich (at) dlr.deUNSPECIFIED
Requena, GuillermoGuillermo.Requena (at) dlr.deUNSPECIFIED
Laqua, RomualdACCESS eV, AachenUNSPECIFIED
Weisheit, AndreasFh ILT, AachenUNSPECIFIED
Sket, FredericoIMDEA MadridUNSPECIFIED
Milenkovic, SridjanIMDEA MadridUNSPECIFIED
Granasy, LaszloWIGNER, Budapest, HungaryUNSPECIFIED
Pusztai, TamasWIGNER, Budapest, HungaryUNSPECIFIED
Date:27 September 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Additive manufacturing; 3D-Printing
Event Title:Material Science and Engineering MSE 2018
Event Location:Darmstadt
Event Type:international Conference
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies, L - Combustion Chamber Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research
Institute of Materials Research > Metallic Structures and Hybrid Material Systems
Deposited By: Haubrich, Jan
Deposited On:30 Oct 2018 10:52
Last Modified:19 Nov 2018 10:18

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