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Article

Hot Isostatic Pressing of Aluminum–Silicon Alloys Fabricated by Laser Powder-Bed Fusion

1
Institute of Materials Science and Mechanics of Materials, TUM Department of Mechanical Engineering, Technical University of Munich, 85748 Garching b. München, Germany
2
Faculty of Mechanical Engineering, Esslingen University of Applied Sciences, 73728 Esslingen, Germany
3
Institute for Virtual Product Development, Aalen University of Applied Sciences, 73430 Aalen, Germany
*
Author to whom correspondence should be addressed.
Received: 28 July 2020 / Revised: 11 September 2020 / Accepted: 14 September 2020 / Published: 18 September 2020
(This article belongs to the Special Issue Advances and Innovations in Manufacturing Technologies)
Hot isostatic pressing can be utilized to reduce the anisotropic mechanical properties of Al–Si–Mg alloys fabricated by laser powder-bed fusion (L-PBF). The implementation of post processing densification processes can open up new fields of application by meeting high quality requirements defined by aircraft and automotive industries. A gas pressure of 75 MPa during hot isostatic pressing lowers the critical cooling rate required to achieve a supersaturated solid solution. Direct aging uses this pressure related effect during heat treatment in modern hot isostatic presses, which offer advanced cooling capabilities, thereby avoiding the necessity of a separate solution annealing step for Al–Si–Mg cast alloys. Hot isostatic pressing, followed by rapid quenching, was applied to both sand cast as well as laser powder-bed fused Al–Si–Mg aluminum alloys. It was shown that the critical cooling rate required to achieve a supersaturated solid solution is significantly higher for additively manufactured, age-hardenable aluminum alloys than it is for comparable sand cast material. The application of hot isostatic pressing can be combined with heat treatment, consisting of solution annealing, quenching and direct aging, in order to achieve both a dense material with a small number of preferred locations for the initiation of fatigue cracks and a high material strength. View Full-Text
Keywords: selective laser melting; additive manufacturing; fatigue resistance; critical cooling rate; hip selective laser melting; additive manufacturing; fatigue resistance; critical cooling rate; hip
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MDPI and ACS Style

Hafenstein, S.; Hitzler, L.; Sert, E.; Öchsner, A.; Merkel, M.; Werner, E. Hot Isostatic Pressing of Aluminum–Silicon Alloys Fabricated by Laser Powder-Bed Fusion. Technologies 2020, 8, 48. https://0-doi-org.brum.beds.ac.uk/10.3390/technologies8030048

AMA Style

Hafenstein S, Hitzler L, Sert E, Öchsner A, Merkel M, Werner E. Hot Isostatic Pressing of Aluminum–Silicon Alloys Fabricated by Laser Powder-Bed Fusion. Technologies. 2020; 8(3):48. https://0-doi-org.brum.beds.ac.uk/10.3390/technologies8030048

Chicago/Turabian Style

Hafenstein, Stephan, Leonhard Hitzler, Enes Sert, Andreas Öchsner, Markus Merkel, and Ewald Werner. 2020. "Hot Isostatic Pressing of Aluminum–Silicon Alloys Fabricated by Laser Powder-Bed Fusion" Technologies 8, no. 3: 48. https://0-doi-org.brum.beds.ac.uk/10.3390/technologies8030048

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