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Advances in Metal-Based Additive Manufacturing
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Advances in Metal-Based Additive Manufacturing

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Metals and Alloys".

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 4435

Special Issue Editor

Prof. Dr. Gobinda Saha

E-Mail Website
Guest Editor
Nanocomposites and Mechanics Laboratory, University of New Brunswick, Fredericton, NB E3B 5A3, Canada
Interests: nanostructured particle design and synthesis; cold spraying; cermets; biocomposites; additive manufacturing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Major advances are now being made in the development of 2D/3D/4D additive manufacturing (AM) material technologies for metals, alloys, polymers and composites. These relate, among others, to the application and further development of state-of-the-art AM techniques: cold spraying, binder jetting, object printing, aerosol jet printing, robocasting, etc., through solid-state feedstock deposition, particle laser melting and paste/suspension jetting onto the substrate. The aim of this Special Issue of Materials journal is to advance scientific knowledge through the dissemination of original research results in metal-based additive manufacturing technologies. In particular, the focus areas include:

  • Nanostructured material design;
  • Powder manufacturing;
  • 2D/3D/4D time-lapsed component building;
  • Additive manufacturing;
  • Proof-of-Concept or field applications.

Prof. Dr. Gobinda Saha
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. Materials 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 2600 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

  • nanostructured particles
  • metals
  • alloys
  • additive manufacturing
  • applications

Published Papers (2 papers)

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Research

20 pages, 24594 KiB  
Article
Autonomous Robotic Feature-Based Freeform Fabrication Approach
by Xinyi Xiao and Hanbin Xiao
Materials 2022, 15(1), 247; https://doi.org/10.3390/ma15010247 - 29 Dec 2021
Cited by 14 | Viewed by 1773
Abstract
Robotic additive manufacturing (AM) has gained much attention for its continuous material deposition capability with continuously changeable building orientations, reducing support structure volume and post-processing complexity. However, the current robotic additive process heavily relies on manual geometric reasoning that identifies additive features, related [...] Read more.
Robotic additive manufacturing (AM) has gained much attention for its continuous material deposition capability with continuously changeable building orientations, reducing support structure volume and post-processing complexity. However, the current robotic additive process heavily relies on manual geometric reasoning that identifies additive features, related building orientations, tool approach direction, trajectory generation, and sequencing all features in a non-collision manner. In addition, multi-directional material accumulation cannot ensure the nozzle always stays above the building geometry. Thus, the collision between these two becomes a significant issue that needs to be solved. Hence, the common use of a robotic additive is hindered by the lack of fully autonomous tools based on the abovementioned issues. We present a systematic approach to the robotic AM process that can automate the abovementioned planning procedures in the aspect of collision-free. Typically, input models to robotic AM have diverse information contents and data formats, hindering the feature recognition, extraction, and relations to the robotic motion. Our proposed method integrates the collision-avoidance condition to the model decomposition step. Therefore, the decomposed volumes can be associated with additional constraints, such as accessibility, connectivity, and trajectory planning. This generates an entire workspace for the robotic additive building platform, rotatability, and additive features to determine the entire sequence and avoid potential collisions. This approach classifies the uniqueness of autonomous manufacturing on the robotic AM system to build large and complex metal components that are non-achievable through traditional one-directional AM in a computationally effective manner. This approach also paves the path in constructing an in situ monitoring and closed-loop control on robotic AM to control and enhance the build quality of the robotic metal AM process. Full article
(This article belongs to the Special Issue Advances in Metal-Based Additive Manufacturing)
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20 pages, 7891 KiB  
Article
Characterization of Porous Scaffolds Fabricated by Joining Stacking Based Laser Micro-Spot Welding (JS-LMSW) for Tissue Engineering Applications
by Luis D. Cedeño-Viveros, Ciro A. Rodriguez, Victor Segura-Ibarra, Elisa Vázquez and Erika García-López
Materials 2022, 15(1), 99; https://doi.org/10.3390/ma15010099 - 23 Dec 2021
Viewed by 2164
Abstract
A novel manufacturing approach was used to fabricate metallic scaffolds. A calibration of the laser cutting process was performed using the kerf width compensation in the calculations of the tool trajectory. Welding defects were studied through X-ray microtomography. Penetration depth and width resulted [...] Read more.
A novel manufacturing approach was used to fabricate metallic scaffolds. A calibration of the laser cutting process was performed using the kerf width compensation in the calculations of the tool trajectory. Welding defects were studied through X-ray microtomography. Penetration depth and width resulted in relative errors of 9.4%, 1.0%, respectively. Microhardness was also measured, and the microstructure was studied in the base material. The microhardness values obtained were 400 HV, 237 HV, and 215 HV for the base material, HAZ, and fusion zone, respectively. No significant difference was found between the microhardness measurement along with different height positions of the scaffold. The scaffolds’ dimensions and porosity were measured, their internal architecture was observed with micro-computed tomography. The results indicated that geometries with dimensions under 500 µm with different shapes resulted in relative errors of ~2.7%. The fabricated scaffolds presented an average compressive modulus ~13.15 GPa, which is close to cortical bone properties. The proposed methodology showed a promising future in bone tissue engineering applications. Full article
(This article belongs to the Special Issue Advances in Metal-Based Additive Manufacturing)
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