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Metals
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Selective Laser Melting: Advantages and Challenges
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Selective Laser Melting: Advantages and Challenges

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Additive Manufacturing".

Deadline for manuscript submissions: closed (30 November 2022) | Viewed by 11185

Special Issue Editors

Prof. Dr. Georgina Miranda

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Guest Editor
CICECO, Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal
Interests: additive manufacturing; selective laser melting; laser approaches for melting/sintering/surface modification; cellular structures and cutting tools
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Filipe Samuel Correia Pereira da Silva

E-Mail Website1 Website2
Guest Editor
Centre for Micro-Electro Mechanical Systems (CMEMS-UMinho), University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal
Interests: multi-material/physics/functional/scale materials; selective laser melting; mechanical engineering
Special Issues, Collections and Topics in MDPI journals
Dr. Flávio Bartolomeu

E-Mail Website
Guest Editor
Center for Micro-Electro Mechanical Systems (CMEMS-UMinho), University of Minho, 4800-058 Guimarães, Portugal
Interests: Multi-material Additive Manufacturing; Selective Laser Melting; Mechanical characterization; Cellular structures

Special Issue Information

Dear colleagues,

Additive Manufacturing (AM) is revolutionizing the way products are designed, fabricated and distributed to end users. Selective Laser Melting (SLM), an AM powder–bed fusion technique is being developed at a particularly fast pace, as both academy and industry become aware of its ability to fabricate complex geometries and customized products with adequate mechanical properties. However, if on the one hand, SLM allows to re-imagine current research and unleash completely new ideas, on the other hand there is still a need of comprehensive manufacturing strategies, design philosophies and standardization of best practices.

In this Special Issue, we welcome reviews and articles that focus on Selective Laser Melting of metals and alloys, metal matrix composites, functionally graded materials, multi-material parts, cellular structures, etc. We welcome either experimental or numerical studies addressing component design approaches (e.g., topology optimization for AM), manufacturing strategies for different purposes (e.g., speed, cost, deformation, geometrical accuracy, residual stresses), characterization including standardized procedures and also failure analysis of damaged AM manufactured components.

Prof. Dr. Georgina Miranda
Prof. Dr. Filipe Samuel Correia Pereira da Silva
Dr. Flávio Bartolomeu
Guest Editors

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. Metals is an international peer-reviewed open access monthly 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

  • Selective Laser Melting (SLM)
  • Design for Additive Manufacturing
  • Manufacturing strategies
  • Optimized fabrication for improved quality
  • Material properties
  • Failure analysis

Published Papers (3 papers)

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Research

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10 pages, 1840 KiB  
Article
The Use of Selective Laser Melting in Mandibular Retrognathia Correction
by Andrej Čretnik and Anita Fekonja
Metals 2022, 12(9), 1544; https://doi.org/10.3390/met12091544 - 19 Sep 2022
Viewed by 1686
Abstract
Digitalization and additive manufacturing offer new possibilities in the manufacturing of individualized medical and dental products. In the paper we present the results of the first 30 consecutive growing patients (15 males and 15 females), with a mean age of 13.69 years (SD [...] Read more.
Digitalization and additive manufacturing offer new possibilities in the manufacturing of individualized medical and dental products. In the paper we present the results of the first 30 consecutive growing patients (15 males and 15 females), with a mean age of 13.69 years (SD = 1.26), who were treated for mandibular retrognathia (skeletal Class II malocclusion), using fixed sagittal guidance (FSG) appliance, individually manufactured by selective laser melting (SLM). Lateral cephalometric radiographs were taken before (T0) and after (T1) treatment and a detailed cephalometric analysis was performed. with a special focus on a time period for malocclusion correction. The analyzed data were compared with the control group (CG; treated with intermaxillary Class II elastics) that was matched for pretreatment age and pretreatment cephalometric measurements. Both methods were effective in the correction of Class II malocclusion, but the time period of correction was significantly shorter (16.03 ± 1.09 months vs. 20.65 ± 4.12 months) with the FSG appliance. After treatment visual skeletal and dentoalveolar effects were achieved, with statistically significant differences measured in mandibular incisors inclination (0.45° in FSG and 2.84° in CG) and distance (−0.61 mm in FSG and 0.13 mm in CG), in mandibular first molar inclination (−1.07° in FSG and 1.18° in CG) and overbite (−3.82 mm in FSG and −2.46 mm in CG), all in favor of FSG appliance. After the final mean treatment time of 16.03 ± 1.09 months, visual skeletal and dentoalveolar effects were achieved, with significant differences in sagittal (SNB angle, SNPg angle, mandibular length (CoGn) and consequently decrease in ANB angle) as well as in vertical (lower anterior facial height (LAFH) and gonial angle) measurements noted, with no reported complications. As the time needed for malocclusion correction was comparable with the reports in the traditional use of the functional appliance and as all the cosmetical and functional changes in all the treated patients remained stable after a 2-year observational period, growing patients with Class II malocclusion could benefit with this type of treatment. As all the cosmetical and functional changes in all the treated patients remained stable after a 2-year observational period, growing patients with Class II malocclusion could benefit from the treatment with FSG appliance. Full article
(This article belongs to the Special Issue Selective Laser Melting: Advantages and Challenges)
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13 pages, 6859 KiB  
Article
The Influence of Laser Power and Scan Speed on the Dimensional Accuracy of Ti6Al4V Thin-Walled Parts Manufactured by Selective Laser Melting
by Georgina Miranda, Susana Faria, Flávio Bartolomeu, Elodie Pinto, Nuno Alves and Filipe Samuel Silva
Metals 2022, 12(7), 1226; https://doi.org/10.3390/met12071226 - 20 Jul 2022
Cited by 6 | Viewed by 2106
Abstract
Laser Powder Bed Fusion (LPBF) technologies such as Selective Laser Melting (SLM) are being increasingly considered as viable production routes. This paradigm change demands an in-depth understanding of the fabrication process and variables, as previous studies have shown that energy density calculation alone [...] Read more.
Laser Powder Bed Fusion (LPBF) technologies such as Selective Laser Melting (SLM) are being increasingly considered as viable production routes. This paradigm change demands an in-depth understanding of the fabrication process and variables, as previous studies have shown that energy density calculation alone is insufficient, because parts fabricated using similar energy density, but using different combinations of parameters, can display significantly different properties and dimensions. Thin-walled parts are particularly influenced by processing parameters; in this sense, this study explores the influence of laser power and scan speed on the dimensions of Ti6Al4V thin-walled tubes. Predictive models for manufacturing Ti6Al4V thin-walled tubes were developed using Response Surface Methodology (RSM), and the most influential (single and combined) factors were determined using Analysis of Variance (ANOVA). Three models were obtained: for the wall melt zone thickness, the total wall thickness, and the hole width. Full article
(This article belongs to the Special Issue Selective Laser Melting: Advantages and Challenges)
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Review

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22 pages, 6735 KiB  
Review
Mechanical Properties of Ti6Al4V Fabricated by Laser Powder Bed Fusion: A Review Focused on the Processing and Microstructural Parameters Influence on the Final Properties
by Flávio Bartolomeu, Michael Gasik, Filipe Samuel Silva and Georgina Miranda
Metals 2022, 12(6), 986; https://doi.org/10.3390/met12060986 - 8 Jun 2022
Cited by 30 | Viewed by 5840
Abstract
Ti6Al4V alloy is an ideal lightweight structural metal for a huge variety of engineering applications due to its distinguishing combination of high specific mechanical properties, excellent corrosion resistance and biocompatibility. In this review, the mechanical properties of selective laser-melted Ti6Al4V parts are addressed [...] Read more.
Ti6Al4V alloy is an ideal lightweight structural metal for a huge variety of engineering applications due to its distinguishing combination of high specific mechanical properties, excellent corrosion resistance and biocompatibility. In this review, the mechanical properties of selective laser-melted Ti6Al4V parts are addressed in detail, as well as the main processing and microstructural parameters that influence the final properties. Fundamental knowledge is provided by linking the microstructural features and the final mechanical properties of Ti6Al4V parts, including tensile strength, tensile strain, fatigue resistance, hardness and wear performance. A comparison between Laser Powder Bed Fusion and conventional processing routes is also addressed. The presence of defects in as-built Ti6Al4V parts and their influences on the mechanical performance are also critically discussed. The results available in the literature show that typical Laser Powder Bed–Fused Ti6Al4V tensile properties (>900 MPa yield strength and >1000 MPa tensile strength) are adequate when considering the minimum values of the standards for implants and for aerospace applications (e.g., ASTM F136–13; ASTM F1108–14; AMS4930; AMS6932). Full article
(This article belongs to the Special Issue Selective Laser Melting: Advantages and Challenges)
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