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Article

Understanding Inhomogeneous Mechanical Properties in PBF-LB/M Manufactured Parts Due to Inhomogeneous Macro Temperature Profiles Based on Process-Inherent Preheating

by
Jonas Zielinski
1,2,*,
Jan Theunissen
1,
Henrik Kruse
1,
Silja-Katharina Rittinghaus
3,
Johannes Henrich Schleifenbaum
1,
Dongjian Zhu
4 and
Mustafa Megahed
5
1
Digital Additive Production DAP, RWTH Aachen University, Campus Boulevard 73, 52074 Aachen, Germany
2
ModuleWorks GmbH, Henricistraße 50, 52072 Aachen, Germany
3
Chair of Materials Science and Additive Manufacturing, School of Mechanical Engineering and Safety Engineering, University of Wuppertal, Gaußstr. 20, 42119 Wuppertal, Germany
4
GKN Powder Metallurgy Engineering GmbH, Pennefeldsweg 11-15, 53177 Bonn, Germany
5
ESI Germany GmbH, Kruppstr. 90, 45145 Essen, Germany
*
Author to whom correspondence should be addressed.
J. Manuf. Mater. Process. 2023, 7(3), 88; https://doi.org/10.3390/jmmp7030088
Submission received: 31 March 2023 / Revised: 25 April 2023 / Accepted: 1 May 2023 / Published: 5 May 2023
(This article belongs to the Special Issue Progress in Powder-Based Additive Manufacturing)
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Abstract

The mechanical properties in laser-based powder bed fusion (PBF-LB/M) manufactured parts are anisotropic in nature due to the layer-wise build-up but also change due to different solidification conditions in dependence on the process strategy and the geometry. In this work, the latter effect is examined by means of simulating the thermal history on a part scale (macro temperature) and correlating the critical temperature and holding time with the local hardness and microstructure. A macro temperature model is introduced and validated with vector-based thermal simulations and thermo couple measurements from the build-up process. Two cone-shaped geometries are investigated, namely, an upright and an inverted cone. The examinations are performed and validated with Inconel 718. An outlook to further investigations and more complex, real-life applicable geometries is given.
Keywords: additive manufacturing; laser powder bed fusion; finite element modelling; microstructure; Inconel 718 additive manufacturing; laser powder bed fusion; finite element modelling; microstructure; Inconel 718

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MDPI and ACS Style

Zielinski, J.; Theunissen, J.; Kruse, H.; Rittinghaus, S.-K.; Schleifenbaum, J.H.; Zhu, D.; Megahed, M. Understanding Inhomogeneous Mechanical Properties in PBF-LB/M Manufactured Parts Due to Inhomogeneous Macro Temperature Profiles Based on Process-Inherent Preheating. J. Manuf. Mater. Process. 2023, 7, 88. https://doi.org/10.3390/jmmp7030088

AMA Style

Zielinski J, Theunissen J, Kruse H, Rittinghaus S-K, Schleifenbaum JH, Zhu D, Megahed M. Understanding Inhomogeneous Mechanical Properties in PBF-LB/M Manufactured Parts Due to Inhomogeneous Macro Temperature Profiles Based on Process-Inherent Preheating. Journal of Manufacturing and Materials Processing. 2023; 7(3):88. https://doi.org/10.3390/jmmp7030088

Chicago/Turabian Style

Zielinski, Jonas, Jan Theunissen, Henrik Kruse, Silja-Katharina Rittinghaus, Johannes Henrich Schleifenbaum, Dongjian Zhu, and Mustafa Megahed. 2023. "Understanding Inhomogeneous Mechanical Properties in PBF-LB/M Manufactured Parts Due to Inhomogeneous Macro Temperature Profiles Based on Process-Inherent Preheating" Journal of Manufacturing and Materials Processing 7, no. 3: 88. https://doi.org/10.3390/jmmp7030088

APA Style

Zielinski, J., Theunissen, J., Kruse, H., Rittinghaus, S.-K., Schleifenbaum, J. H., Zhu, D., & Megahed, M. (2023). Understanding Inhomogeneous Mechanical Properties in PBF-LB/M Manufactured Parts Due to Inhomogeneous Macro Temperature Profiles Based on Process-Inherent Preheating. Journal of Manufacturing and Materials Processing, 7(3), 88. https://doi.org/10.3390/jmmp7030088

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