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  4. Thermal conductivity of Ti-6Al-4V in laser powder bed fusion
 
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Thermal conductivity of Ti-6Al-4V in laser powder bed fusion

Citation Link: https://doi.org/10.15480/882.4473
Publikationstyp
Journal Article
Date Issued
2022-07-01
Sprache
English
Author(s)
Bartsch, Katharina  orcid-logo
Bossen, Bastian 
Chaudhary, Waqar  
Landry, Michael  
Herzog, Dirk  orcid-logo
Institut
Laser- und Anlagensystemtechnik T-2  
TORE-DOI
10.15480/882.4473
TORE-URI
http://hdl.handle.net/11420/13180
Journal
Frontiers in mechanical engineering  
Volume
8
Article Number
830104
Citation
Frontiers in Mechanical Engineering 8: 830104 (2022-07-01)
Publisher DOI
10.3389/fmech.2022.830104
Scopus ID
2-s2.0-85134253611
Publisher
Frontiers Media S.A.
With increasing maturity of the laser powder bed fusion (PBF-LB/M) process, the related products are becoming more complex. The more conventional parts are integrated into one design, the more requirements regarding local material properties arise. This concerns for instance products with high demands regarding temperature management. Here, different thermal conductivities within the part enable the control of the temperature distribution as well as the direction of heat flows. The realization of those local properties poses a challenge, though, as the use of multiple materials in PBF-LB/M is not broadly available. However, the different states of material in PBF-LB/M, i.e. bulk and powder material, provide the opportunity to create thermal metamaterials with locally varied thermal conductivities. To enable part design utilizing the bulk material as well as enclosed powder, this study investigates the respective thermal conductivities of Ti-6Al-4V. Powder and printed samples were measured at RT by the Modified Transient Plane Source method, resulting in an effective thermal conductivity of 0.13 W/mK for powder and 5.4 W/mK for bulk material (compared to 6.5 W/mK in prior experiments). For complete assessment of the powder material, because of the many uncertainties due to the particle size distribution and powder application, a computational model following the network modeling approach is created. The model is used to create a data set of 60 different powder bed configurations, which is then statistically evaluated to provide a description independent from powder packing. Finally, the application of the investigations to achieve thermal metamaterials capable of local temperature management with a single material is presented in a numerical study. Here, the use cases of thermal shielding as well as the concentration of heat flow is demonstrated.
Subjects
laser powder bed fusion
thermal conductivity
Ti-6Al-4V
thermal metamaterials
modified transient plane source
modeling
DDC Class
530: Physik
More Funding Information
The authors would like to thank C-Therm Technologies Ltd. (New Brunswick, Canada) for providing one of their MTPS sensor for the experimental measurements, and Florian Gerdts of Element 22 GmbH for the insightful discussions on powder properties.
Publication version
publishedVersion
Lizenz
https://creativecommons.org/licenses/by/4.0/
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