New Materials and Concepts for Additive Manufacturing with Metals II

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Metals and Alloys".

Deadline for manuscript submissions: closed (11 January 2024) | Viewed by 1101

Special Issue Editors


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Guest Editor
Chair of Materials Science, Paderborn University, 33098 Paderborn, Germany
Interests: additive manufacturing; alloy design; microstructure; mechanical properties; biomedical applications; soft-magnetic materials
Special Issues, Collections and Topics in MDPI journals
MSMP Mechanics, Surfaces and Materials Processing, 13617 Aix-en-Provence, France
Interests: laser additive manufacturing; selective laser melting; laser powder bed fusion and directed energy deposition; microstructure and characterization; mechanical properties

Special Issue Information

Dear Colleagues,

As is well-known, laser powder bed-based additive manufacturing techniques for processing metals are almost established techniques for producing highly complex components and parts. The almost unrestricted freedom of geometry, for example, enables the integration of cooling channels close to the contour to minimize local hot spots so that the processing time can be shortened and the component distortion of the semi-finished product can be minimized. In addition to the high design flexibility, components can be generated close to the contour due to the layer-by-layer material application, i.e., work- and energy-intensive post-machining is often not required.

Nevertheless, the limited material spectrum and low process speeds have impeded the breakthrough of additively manufactured components on a large scale to date. For this reason, new materials are increasingly being developed explicitly for the AM process employing computer-based materials design.

The present Special Issue, entitled, “New Materials and Concepts for Additive Manufacturing with Metals II”, aims to summarize the progress achieved in the last five years, as well as highlight recent research.

Dr. Kay-Peter Hoyer
Dr. Nan Kang
Guest Editors

Manuscript Submission Information

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Keywords

  • additive manufacturing
  • alloy design
  • coating
  • fatigue performance
  • functionally graded materials
  • functional integration
  • laser powder bed fusion
  • mechanical properties
  • microstructure
  • new materials for AM
  • phase transformation
  • powder analysis
  • post-processing
  • X-ray diffraction

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Published Papers (1 paper)

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Research

23 pages, 9437 KiB  
Article
Additive Manufacturing and Mechanical Properties of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn Biomedical Stents: A Combined Experimental and Computational Modelling Approach
by Sudipta Pramanik, Dennis Milaege, Maxwell Hein, Kay-Peter Hoyer and Mirko Schaper
Crystals 2023, 13(11), 1592; https://doi.org/10.3390/cryst13111592 - 17 Nov 2023
Viewed by 785
Abstract
The effect of plaque deposition (atherosclerosis) on blood flow behaviour is investigated via computational fluid dynamics and structural mechanics simulations. To mitigate the narrowing of coronary artery atherosclerosis (stenosis), the computational modelling of auxetic and non-auxetic stents was performed in this study to [...] Read more.
The effect of plaque deposition (atherosclerosis) on blood flow behaviour is investigated via computational fluid dynamics and structural mechanics simulations. To mitigate the narrowing of coronary artery atherosclerosis (stenosis), the computational modelling of auxetic and non-auxetic stents was performed in this study to minimise or even avoid these deposition agents in the future. Computational modelling was performed in unrestricted (open) conditions and restricted (in an artery) conditions. Finally, stent designs were produced by additive manufacturing, and mechanical testing of the stents was undertaken. Auxetic stent 1 and auxetic stent 2 exhibit very little foreshortening and radial recoil in unrestricted deployment conditions compared to non-auxetic stent 3. However, stent 2 shows structural instability (strut failure) during unrestricted deployment conditions. For the restricted deployment condition, stent 1 shows a higher radial recoil compared to stent 3. In the tensile test simulations, short elongation for stent 1 due to strut failure is demonstrated, whereas no structural instability is noticed for stent 2 and stent 3 until 0.5 (mm/mm) strain. The as-built samples show a significant thickening of the struts of the stents resulting in short elongations during tensile testing compared to the simulations (stent 2 and stent 3). A modelling framework for the stent deployment system that enables the selection of appropriate stent designs before in vivo testing is required. This leads to the acceleration of the development process and a reduction in time, resulting in less material wastage. The modelling framework shall be useful for doctors designing patient-specific stents. Full article
(This article belongs to the Special Issue New Materials and Concepts for Additive Manufacturing with Metals II)
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