Additive Manufacturing of Metals and Composites: Processing, Microstructure and Mechanical Response

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "D:Materials and Processing".

Deadline for manuscript submissions: closed (20 December 2021) | Viewed by 4828

Special Issue Editors


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Guest Editor
Materials Group, Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore
Interests: metal additive manufacturing; processing; characterization; lightweight materials; nanocomposites
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Mechanical Engineering, Indian Institute of Technology (IIT), Guwahati, India
Interests: additive manufacturing; polymer composites 3D printing; cement and ceramic composites; material characterization
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Research in additive manufacturing (AM) of metals and composites has witnessed a dramatic rise in global attention for almost past two decades. Development of 3D printers with faster printing speed, new feedstock materials and understanding the process-structure-property relationship in AM parts are among the priority focus areas in both academia and industrial research.

A number of metal additive manufacturing (AM) processes are currently available in the market depending on the heat source type and feeding mechanism of raw materials. However additive manufacturing of composites including polymer composite, metal matrix composite fiber reinforced composites are carried out using both extrusion and laser based techniques. To exploit full potential of AM process, novel material combinations for these special processing conditions need to be developed. This requires a deep understanding of the material consolidation mechanisms during manufacturing process that can be realized through critical microstructural analysis and mechanical testing.

Accordingly, this special issue of Micromachines aims at seeking research articles related to novel AM processing methods and microstructure and multifunctional properties of additively manufactured metals and composite formulations/components. Although the focus of this Special Issue is focused on AM of metal and composite materials, articles dealing with other manufacturing processes with related analogies can also be included, in order to establish differences and possible similarities. Review articles are also most welcome.

Potential topics that fall in the scope of the special issue include, but are not limited to, the following:

  • New materials for metal and composite additive manufacturing
  • High-throughput microstructure analysis of additively manufactured parts
  • Mechanical properties of AM parts including those which are processed differently
  • Additive manufacturing with site-specific properties
  • Post processing of additive manufacturing parts


Prof. Dr. Manoj Gupta
Prof. Dr. Biranchi Panda
Guest Editors

Manuscript Submission Information

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Keywords

  • Metal additive manufacturing,
  • Composite 3D printing,
  • Processing technology
  • Microstructure characterization

Published Papers (1 paper)

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Research

11 pages, 2518 KiB  
Article
Achieving Triply Periodic Minimal Surface Thin-Walled Structures by Micro Laser Powder Bed Fusion Process
by Shuo Qu, Junhao Ding and Xu Song
Micromachines 2021, 12(6), 705; https://doi.org/10.3390/mi12060705 - 16 Jun 2021
Cited by 23 | Viewed by 3896
Abstract
Recently, triply periodic minimal surface (TPMS) lattice structures have been increasingly employed in many applications, such as lightweighting and heat transfer, and they are enabled by the maturation of additive manufacturing technology, i.e., laser powder bed fusion (LPBF). When the shell-based TPMS structure’s [...] Read more.
Recently, triply periodic minimal surface (TPMS) lattice structures have been increasingly employed in many applications, such as lightweighting and heat transfer, and they are enabled by the maturation of additive manufacturing technology, i.e., laser powder bed fusion (LPBF). When the shell-based TPMS structure’s thickness decreases, higher porosity and a larger surface-to-volume ratio can be achieved, which results in an improvement in the properties of the lattice structures. Micro LPBF, which combines finer laser beam, smaller powder, and thinner powder layer, is employed in this work to fabricate the thin-walled structures (TWS) of TPMS lattice by stainless steel 316 L (SS316L). Utilizing this system, the optimal parameters for printing TPMS-TWS are explored in terms of densification, smoothness, limitation of thickness, and dimensional accuracy. Cube samples with 99.7% relative density and a roughness value of 2.1 μm are printed by using the energy density of 100 J/mm3. Moreover, a thin (100 μm thickness) wall structure can be fabricated through optimizing parameters. Finally, the TWS samples with various TPMS structures are manufactured to compare their heat dissipation capability. As a result, TWS sample of TPMS lattice exhibits a larger temperature gradient in the vertical direction compared to the benchmark sample. The steady-state temperature of the sample base presents a 7 K decrease via introducing TWS. Full article
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