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Influence of manufacturing parameters on microstructure and subsurface residual stress in SLM Ti-6Al-4V

Mishurova, Tatiana and Artzt, Katia Juliane and Haubrich, Jan and Requena, Guillermo and Bruno, Giovanni (2018) Influence of manufacturing parameters on microstructure and subsurface residual stress in SLM Ti-6Al-4V. Advanced additive Manufacturing Symposium AAMS18, 03.09.2018, Sheffield, GB.

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Using non-optimum combination manufacturing parameters in selective laser melting (SLM) may lead to reduction of quality of component: defects generation, distortion of geometry and even cracking. Usually, the optimization of parameters is performed at first with the goal to minimize porosity values, which are easy to measure. However, not only low porosity but also a stable microstructure and low residual stresses will help to achieve the desired mechanical behavior of the material and, thus, the component. In present work, we investigated cuboid-shaped Ti-6Al-4V samples produced with different manufacturing parameters. Residual stresses in subsurface region were investigated by synchrotron X-ray diffraction, which allows to penetrate around 100 µm into the surface and therefore to overcome the problem of high roughness of SLM components without additional sample preparation and resulting artifacts. Only tensile stresses were found along the building direction that can play critical role especially during cyclic loading. The pore shape and spatial distribution obtained by computed tomography varied for samples produced with the same Ev. Importantly, by adjusting specific process parameters it was possible to decrease residual stresses while at the same time obtaining a uniform α+β Ti microstructure and relatively low porosity.

Item URL in elib:https://elib.dlr.de/122503/
Document Type:Conference or Workshop Item (Poster)
Title:Influence of manufacturing parameters on microstructure and subsurface residual stress in SLM Ti-6Al-4V
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Haubrich, JanUNSPECIFIEDhttps://orcid.org/0000-0002-5748-2755UNSPECIFIED
Date:3 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:Advanced additive Manufacturing Symposium AAMS18
Event Location:Sheffield, GB
Event Type:international Conference
Event Dates:03.09.2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space System Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Space System Technology
DLR - Research theme (Project):Proj Selec ALS Druckverfahren (old), R - Selec ALS Druckverfahren (old), L - Turbine Technologies (old), L - Fan and Compressor Technologies (old), L - Combustion Chamber Technologies (old)
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 10:54
Last Modified:29 Mar 2023 00:38

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