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Main Title: Build-up strategies for additive manufacturing of three dimensional Ti-6Al-4V-parts produced by laser metal deposition
Author(s): Spranger, Felix
Graf, Benjamin
Schuch, Michael
Hilgenberg, Kai
Rethmeier, Michael
Type: Article
Abstract: Laser metal deposition (LMD) has been applied as a coating technology for many years. Today, the technologies capacity to produce 3D depositions leads to a new field of application as additive manufacturing method. In this paper, 3D laser metal deposition of titanium alloy Ti-6Al-4 V is studied with special regard to the demands of additive manufacturing. Therefore, only the coaxial LMD powder nozzle is used to create the shielding gas atmosphere, which ensures high geometric flexibility. Furthermore, specimen with high aspect ratio and hundreds of layers are manufactured, which represent typical features in additive manufacturing. The presented study contains the following steps: First, cylindrical specimens are manufactured with a standard shell-core build-up strategy and mechanical properties as well as fracture mechanisms are determined. Based on the results, experiments are conducted to improve the build-up strategy and new tensile test specimens are built with the improved strategy. The improved strategy incorporates variable track overlap ratios to achieve a constant growth in the shell and core area. As blanks, lean cylinders comprising more than 240 layers and a height of more than 120 mm are manufactured. The specimens are analyzed by X-ray inspection for material defects. Fractured surfaces are observed via scanning electron microscopy and the composition of the surfaces is determined using energy dispersive X-ray spectroscopy. The tensile test results prove mechanical properties close to ASTM F1108 specification for wrought material.
Subject(s): energy dispersive X-ray spectroscopy
metal deposition
strongly damped collisions
chemical elements
materials properties
nonequilibrium thermodynamics
scanning electron microscopy
mechanical properties
Issue Date: 23-Mar-2018
Date Available: 28-May-2020
Language Code: en
DDC Class: 530 Physik
Journal Title: Journal of Laser Applications
Publisher: Laser Institute of America (LIA), American Institute of Physics (AIP)
Volume: 30
Issue: 2
Article Number: 22001
Publisher DOI: 10.2351/1.4997852
EISSN: 1938-1387
ISSN: 1042-346X
Notes: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Journal of Laser Applications 30, 022001 (2018) and may be found at
TU Affiliation(s): Fak. 5 Verkehrs- und Maschinensysteme » Inst. Werkzeugmaschinen und Fabrikbetrieb » FG Fügetechnik
Appears in Collections:Technische Universität Berlin » Publications

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