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Applied Sciences
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New Trends on Selective Laser Melting
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New Trends on Selective Laser Melting

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Mechanical Engineering".

Deadline for manuscript submissions: closed (31 December 2020) | Viewed by 17799

Special Issue Editor

Dr. Alberto Boschetto

E-Mail Website
Guest Editor
Department of Mechanical and Aerospace Engineering, Sapienza University of Rome via Eudossiana 18, 00184 Rome, Italy
Interests: modeling and simulation; machining; powders; manufacturing

Special Issue Information

Dear Colleague,

Applied Sciences (ISSN 2076-3417) is a high visibility journal covering all aspects of applied engineering. Experimental and theoretical results that are presented in as much detail as possible are encouraged. The journal is indexed by the Science Citation Index Expanded (Web of Science), Scopus, Inspec (IET) and other databases. Its Impact Factor is 1.689 (2017) and the 5-Year Impact Factor is 1.855 (2017). Applied Sciences is available online at: https://www.mdpi.com/journal/applsci.

I am currently guest editing a Special Issue of the journal, focused on " New Trends in Selective Laser Melting". Selective laser melting (SLM) is gradually introducing revolutionary changes to manufacturing processes and will play a significant part in future economic growth. Today there is a focus on finding a balance between production and consumption, and SLM presents a way to improve the performance of resources. SLM is being widely investigated by many governments, research institutions, enterprises and the media.

The purpose of this Special Issue is to provide the reader with a collection of valuable research papers highlighting SLM trends. Topics include but are not limited to developments in materials, highly-complex and high-performance products, embedded functionality, process modeling, thermal treatment, post-processing, surface conditioning, support optimization, part characterization, powder characterization, part and process design, process management with warrant attention, and databases and digital rights.

Within the framework of this Special Issue, I would like to invite you to submit a paper to Applied Sciences. I would greatly appreciate if you would forward this call to friends, colleagues and co-workers working in the field.

Dr. Alberto Boschetto
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • selective laser melting
  • process simulation
  • surface quality prediction
  • process modeling
  • accuracy
  • surface roughness
  • assembly and non-assembly mechanism
  • surface chemistry
  • part characterization
  • support optimization
  • post processing
  • part finishing
  • thermal treatment
  • new materials
  • powder characterization

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Published Papers (4 papers)

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Research

12 pages, 3158 KiB  
Article
Fabrication of a Porous Three-Dimensional Scaffold with Interconnected Flow Channels: Co-Cultured Liver Cells and In Vitro Hemocompatibility Assessment
by Muxin Li, Rubina Rahaman Khadim, Mitsuru Nagayama, Marie Shinohara, Kousuke Inamura, Mathieu Danoy, Masaki Nishikawa, Katsuko Furukawa, Yasuyuki Sakai and Toshiki Niino
Appl. Sci. 2021, 11(6), 2473; https://doi.org/10.3390/app11062473 - 10 Mar 2021
Cited by 4 | Viewed by 2505
Abstract
The development of large-scale human liver scaffolds equipped with interconnected flow channels in three-dimensional space offers a promising strategy for the advancement of liver tissue engineering. Tissue-engineered scaffold must be blood-compatible to address the demand for clinical transplantable liver tissue. Here, we demonstrate [...] Read more.
The development of large-scale human liver scaffolds equipped with interconnected flow channels in three-dimensional space offers a promising strategy for the advancement of liver tissue engineering. Tissue-engineered scaffold must be blood-compatible to address the demand for clinical transplantable liver tissue. Here, we demonstrate the construction of 3-D macro scaffold with interconnected flow channels using the selective laser sintering (SLS) fabrication method. The accuracy of the printed flow channels was ensured by the incorporation of polyglycolic acid (PGA) microparticles as porogens over the conventional method of NaCl salt leaching. The fabricated scaffold was populated with Hep G2, followed by endothelization with endothelial cells (ECs) grown under perfusion of culture medium for up to 10 days. The EC covered scaffold was perfused with platelet-rich plasma for the assessment of hemocompatibility to examine its antiplatelet adhesion properties. Both Hep G2-covered scaffolds exhibited a markedly different albumin production, glucose metabolism and lactate production when compared to EC-Hep G2-covered scaffold. Most importantly, EC-Hep G2-covered scaffold retained the antiplatelet adhesion property associated with the perfusion of platelet-rich plasma through the construct. These results show the potential of fabricating a 3-D scaffold with interconnected flow channels, enabling the perfusion of whole blood and circumventing the limitation of blood compatibility for engineering transplantable liver tissue. Full article
(This article belongs to the Special Issue New Trends on Selective Laser Melting)
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16 pages, 19391 KiB  
Article
Effect of Industrial Heat Treatment and Barrel Finishing on the Mechanical Performance of Ti6Al4V Processed by Selective Laser Melting
by Filippo Nalli, Luana Bottini, Alberto Boschetto, Luca Cortese and Francesco Veniali
Appl. Sci. 2020, 10(7), 2280; https://doi.org/10.3390/app10072280 - 27 Mar 2020
Cited by 18 | Viewed by 3048
Abstract
Additive manufacturing is now capable of delivering high-quality, complex-shaped metallic components. The titanium alloy Ti6Al4V is an example of a printable metal being broadly used for advanced structural applications. A sound characterization of static mechanical properties of additively manufactured material is crucial for [...] Read more.
Additive manufacturing is now capable of delivering high-quality, complex-shaped metallic components. The titanium alloy Ti6Al4V is an example of a printable metal being broadly used for advanced structural applications. A sound characterization of static mechanical properties of additively manufactured material is crucial for its proper application, and here specifically for Ti6Al4V. This includes a complete understanding of the influence of postprocess treatment on the material behavior, which has not been reached yet. In the present paper, the postprocess effects of surface finish and heat treatment on the mechanical performance of Ti6Al4V after selective laser melting were investigated. Some samples were subjected to barrel finishing at two different intensities, while different sets of specimens underwent several thermal cycles. As a reference, a control group of specimens was included, which did not undergo any postprocessing. The treatments were selected to be effective and easy to perform, being suitable for real industrial applications. Tensile tests were performed on all the samples, to obtain yield stress, ultimate tensile strength and elongation at fracture. The area reduction of the barrel-finished samples, after being tested, was measured by using a 3D scanner, as a further indication of ductility. Experimental results are reported and discussed, highlighting the effect of postprocessing treatments on the mechanical response. We then propose the optimal postprocessing procedure to enhance ductility without compromising strength, for structures manufactured from Ti6Al4V with selective laser melting. Full article
(This article belongs to the Special Issue New Trends on Selective Laser Melting)
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19 pages, 8875 KiB  
Article
Post-Processing of Complex SLM Parts by Barrel Finishing
by Alberto Boschetto, Luana Bottini, Luciano Macera and Francesco Veniali
Appl. Sci. 2020, 10(4), 1382; https://doi.org/10.3390/app10041382 - 19 Feb 2020
Cited by 51 | Viewed by 5148
Abstract
Selective laser melting (SLM) enables the production of metal complex shapes that are difficult or impossible to obtain with conventional production processes. However, the attainable surface quality is insufficient for most applications; thus, a secondary finishing is frequently required. Barrel finishing is an [...] Read more.
Selective laser melting (SLM) enables the production of metal complex shapes that are difficult or impossible to obtain with conventional production processes. However, the attainable surface quality is insufficient for most applications; thus, a secondary finishing is frequently required. Barrel finishing is an interesting candidate but is often applied without consistent criteria aimed at finding processing parameters. This work presents a methodology based on Bagnold number evaluation and bed behavior diagram, developed on experimental apparatus with different charges and process parameters. The experimentation on an industrial machine and the profilometric analysis allowed the identification of appropriate process parameters and charge media for finishing the investigated materials (Ti6Al4V and Inconel718). Two case studies, characterized by complex shapes, were considered, and consistent surface measures allowed understanding the capability of the technology. Full article
(This article belongs to the Special Issue New Trends on Selective Laser Melting)
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12 pages, 6185 KiB  
Article
Applying Selective Laser Melting to Join Al and Fe: An Investigation of Dissimilar Materials
by Dinh-Son Nguyen, Hong-Seok Park and Chang-Myung Lee
Appl. Sci. 2019, 9(15), 3031; https://doi.org/10.3390/app9153031 - 27 Jul 2019
Cited by 25 | Viewed by 6337
Abstract
Combining aluminum and steel is a major goal of automobile manufacturers and other industries because the hybrid material reduces the weight of components. However, differences in chemical properties, thermal expansion, and physical characteristics of aluminum and steel are barriers to achieving this goal. [...] Read more.
Combining aluminum and steel is a major goal of automobile manufacturers and other industries because the hybrid material reduces the weight of components. However, differences in chemical properties, thermal expansion, and physical characteristics of aluminum and steel are barriers to achieving this goal. In this article, selective laser melting (SLM), which is widely used in industrial fields, was applied to join dissimilar materials by printing aluminum on a steel substrate. Defects of joining during the SLM process, characteristics of the intermetallic reaction layer, and the effects of the process parameters were investigated. The analysis indicates that flake behavior could affect the quality of joining. The phases of the intermetallic layer found in this study were in agreement with other research, but the morphology of the layer was much different. A formula to estimate the join quality in terms of density energy is proposed. The results indicate that the SLM process is a promising method to manufacture a hybrid material. Full article
(This article belongs to the Special Issue New Trends on Selective Laser Melting)
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