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New aspects about the search for the most relevant parameters optimizing SLM materials

Mishurova, Tatiana and Artzt, Katia Juliane and Haubrich, Jan and Requena, Guillermo and Bruno, Giovanni (2019) New aspects about the search for the most relevant parameters optimizing SLM materials. Additive Manufacturing (25), pp. 325-334. Elsevier. DOI: 10.1016/j.addma.2018.11.023 ISSN 2214-8604

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Official URL: https://www.sciencedirect.com/science/article/pii/S2214860418307929


While the volumetric energy density is commonly used to qualify a process parameter set, and to quantify its influence on the microstructure and performance of additively manufactured (AM) materials and components, it has been already shown that this description is by no means exhaustive. In this work, new aspects of the optimization of the selective laser melting process are investigated for AM Ti-6Al-4V. We focus on the amount of near-surface residual stress (RS), often blamed for the failure of components, and on the porosity characteristics (amount and spatial distribution). First, using synchrotron x-ray diffraction we show that higher RS in the subsurface region is generated if a lower energy density is used. Second, we show that laser de-focusing and sample positioning inside the build chamber also play an eminent role, and we quantify this influence. In parallel, using X-ray Computed Tomography, we observe that porosity is mainly concentrated in the contour region, except in the case where the laser speed is small. The low values of porosity (less than 1%) do not influence RS.

Item URL in elib:https://elib.dlr.de/130321/
Document Type:Article
Title:New aspects about the search for the most relevant parameters optimizing SLM materials
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mishurova, TatianaBundestanstalt für Materialprüfung BAMUNSPECIFIED
Artzt, Katia JulianeKatia.Artzt (at) dlr.deUNSPECIFIED
Haubrich, JanJan.Haubrich (at) dlr.deUNSPECIFIED
Requena, GuillermoGuillermo.Requena (at) dlr.deUNSPECIFIED
Bruno, GiovanniBundestanstalt für Materialprüfung BAMUNSPECIFIED
Date:January 2019
Journal or Publication Title:Additive Manufacturing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.addma.2018.11.023
Page Range:pp. 325-334
Keywords:additive manufacturing, SLM, Ti-6Al-4V, X-rax Synchrotron diffraction, Computed tomography, residual stress
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Selec ALS Druckverfahren
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Metallic Structures and Hybrid Material Systems
Deposited By: Artzt, Katia Juliane
Deposited On:14 Nov 2019 17:22
Last Modified:14 Nov 2019 17:22

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