Conference Agenda

Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).

Please note that all times are shown in the time zone of the conference. The current conference time is: 4th Aug 2021, 01:11:54am CEST

 
 
Program for LiM 2021
Session
Additive Manufacturing: Innovations for Powderbed Fusion
Time:
Tuesday, 22/June/2021:
1:30pm - 2:30pm

Session Chair: Dr. Dirk Herzog, Hamburg University of Technology, Germany
Location: Room 2
ICM Second Floor 60

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Presentations
1:30pm - 2:00pm

Invited Talk: Advances on the Laser Powder Bed Fusion of Structural Materials: microstructure, processing and material strength

Sergio Amancio

Institute of Materials Science, Joining and Forming, Graz University of Technology, Austria

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2:00pm - 2:15pm

Laser-based powder bed fusion with 16 kW

Artur Leis1,2, Stefan Bechler1, Rudolf Weber1, Thomas Graf1

1Institut für Strahlwerkzeuge (IFSW), University of Stuttgart, Germany; 2Graduate School of Excellence advanced Manufacturing Engineering (GSaME), University of Stuttgart, Germany

Laser-based Powder Bed Fusion (LPBF) is typically performed at laser powers between 500-1000W, and laser beam diameters between 50-500µm. The generation of parts therefore requires a significant amount of time because the average power basically defines the productivity. To reduce the processing time, the laser power was set to 16kW and the laser beam diameter was adjusted to produce continuous melt beads. Additively manufactured samples of AlSi10Mg were used for the high-power experiments. The melting process was recorded with a high-speed camera. The generated beads were analysed metallographically to determine the extent and shape of the molten region, the crystallographic structure and the porosity. It was found that it was possible to generate continuous melt beads with laser beam diameters between 2.5-3.8mm at feed rates between 0.5-1.5m/s with a laser power of 16kW, at the expense of hydrogen-induced porosity. In the talk, the results will be presented and discussed.



2:15pm - 2:30pm

Manufacturing knowledge: model instead of experience, a big step towards reproducibility and first-time-right in the production of complex component geometries using PBF-LB/M

Hannes Korn1, Stefan Holtzhausen2, Claudia Ortmann3, Felix Gebhardt1, Ralph Stelzer2, Welf-Guntram Drossel1

1Fraunhofer Institute for Machine Tools and Forming Technology IWU, Germany; 2Technical University of Dresden, Institute of Machine Elements and Machine Design, Germany; 3Mathys Orthopädie GmbH, Germany

The cost structure and geometry freedom of laser powder bed fusion (PBF-LB/M) holds great potential for lightweight-capabilities, customization and on-demand manufacturing of metal parts. Obstacles currently exist in first-time-right manufacturing and reliable reproducibility under changing process conditions. Reasons are the many setting variables (laser-parameters, process-parameters, scan-strategy) and disturbance variables (powder-batch, operator, ambient conditions), which have a difficult to quantify influence on the quality characteristics of the component (warpage, surface-roughness, porosity).

Compared to the so far widespread experience-based parameterization of the process, statistical modeling has great potential for describing and understanding the effects of the setting- and disturbance variables on the quality characteristics quantitatively. The influence of scan-strategy and laser-parameters on the warpage and surfaces of PBF-LB/M-components is evaluated on cantilever-like bridge specimens according to an optimized experimental plan. The relation between setting variables and quality characteristics is quanified in a linear model approach afterwards and its predictive power is evaluated.



 
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