Special Issue "Advances in Selective Laser Melting"

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: 30 September 2019

Special Issue Editors

Guest Editor
Assoc. Prof. Dr. Naoki Takata

Department of Materials Science and Engineering, Nagoya University, Nagoya, Japan
Website | E-Mail
Interests: physical metallurgy; microstructure; intermetallics; thermodynamic assessments; electron microscopy; additive manufacturing
Guest Editor
Prof. Dr. Makoto Kobashi

Department of Materials Science and Engineering, Nagoya University, Nagoya, Japan
Website | E-Mail
Interests: additive manufacturing; nature inspired materials; metallic foams (porous metals); metal matrix composites; metal/polymer jointing; combustion synthesis

Special Issue Information

Dear Colleagues,

Additive manufacturing (AM) technologies have the great potential to provide an innovation in how metal products are designed and manufactured. The AM process has recently provided novel approaches to control topological structures and microstructure of metal products, which are incorporated in many different varieties of industrial materials applied for automobiles, aircrafts and medical implants. One of the most commonly-used AM processes is a selective laser melting (SLM) combined with powder bed system. The SLM process uses laser beams to melt and fuse powder metals and/or alloys, which may include selective laser sintering (SLS), direct metal laser sintering (DMLS) and selective heat sintering (SHS). This Special Issue covers a wide scope, comprising new (modified) processing routes, product materials, theoretical computations and applications associated with the SLM process including the powder technologies. In addition, recent advances in electron beam melting (EBM) technologies are welcome as well. Topics of particular interest include, but are not limited to:

  • Advancements in selective laser melting (SLM) process
  • New laser processing technologies combined with powder bed system
  • Properties and performance of SLM-produced metals and alloys—mechanical, thermal, electrical, chemical and biologicals
  • Microstructural control of SLM-produced metals and alloys
  • Material (alloy) designs for manufacturing products by SLM
  • Topological designs of metal products applicable for SLM
  • Theoretical computations to further understand phenomenon during SLM processing

Assoc. Prof. Dr. Naoki Takata
Prof. Dr. Makoto Kobashi
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 papers will be 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 1500 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
  • Laser processing
  • Scan strategy
  • Powder metallurgy
  • Rapid melting and solidification
  • Microstructure
  • Physical (mechanical, thermal) and electrochemical (biological) properties
  • Multi-materials and composites
  • Applications (automotive, aviation, consumer electronics, bio-medical, etc.)

Published Papers (3 papers)

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Research

Open AccessFeature PaperArticle
Influence of Material Property Variation on Computationally Calculated Melt Pool Temperature during Laser Melting Process
Metals 2019, 9(4), 456; https://doi.org/10.3390/met9040456
Received: 18 March 2019 / Revised: 3 April 2019 / Accepted: 17 April 2019 / Published: 18 April 2019
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Abstract
Selective Laser Melting (SLM) is a popular additive manufacturing (AM) method where a laser beam selectively melts powder layer by layer based on the building geometry. The melt pool peak temperature during build process is an important parameter to determine build quality of [...] Read more.
Selective Laser Melting (SLM) is a popular additive manufacturing (AM) method where a laser beam selectively melts powder layer by layer based on the building geometry. The melt pool peak temperature during build process is an important parameter to determine build quality of a fabricated component by SLM process. The melt pool temperature depends on process parameters including laser power, scanning speed, and hatch space as well as the properties of the build material. In this paper, the sensitivity of melt pool peak temperature during the build process to temperature dependent material properties including density, specific heat, and thermal conductivity are investigated for a range of laser powers and laser scanning speeds. It is observed that the melt pool temperature is most sensitive to melt pool thermal conductivity of the processed material for a set of specific process parameters (e.g., laser power and scan speed). Variations in the other mechanical–physical properties of powder and melt pool such as density and specific heat are found to have minimal effect on melt pool temperature. Full article
(This article belongs to the Special Issue Advances in Selective Laser Melting)
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Figure 1

Open AccessArticle
Material Characterization, Thermal Analysis, and Mechanical Performance of a Laser-Polished Ti Alloy Prepared by Selective Laser Melting
Metals 2019, 9(2), 112; https://doi.org/10.3390/met9020112
Received: 29 November 2018 / Revised: 20 December 2018 / Accepted: 19 January 2019 / Published: 22 January 2019
Cited by 1 | PDF Full-text (4068 KB) | HTML Full-text | XML Full-text
Abstract
The laser polishing technique offers an adaptable, accurate, and environmentally friendly solution to enhance the surface quality of additive manufactured metallic components. Recent work has shown that the surface roughness of laser additive manufactured metallic alloys can be significantly reduced via the laser [...] Read more.
The laser polishing technique offers an adaptable, accurate, and environmentally friendly solution to enhance the surface quality of additive manufactured metallic components. Recent work has shown that the surface roughness of laser additive manufactured metallic alloys can be significantly reduced via the laser polishing method. This paper examines the mechanical performances of a laser polished surface fabricated by selective laser melting (SLM). Compared with the original SLM surface, systematic measurements revealed that the surface roughness of the laser polished surface can be effectively reduced from 6.53 μm to 0.32 μm, while the microhardness and wear resistance increased by 25% and 39%, respectively. Through a thermal history analysis of the laser polishing process using the finite element model, new martensitic phase formation in the laser polished layer is carefully explained, which reveals significant effects on residual stress, strength, and fatigue. These findings establish foundational data to predict the mechanical performance of laser polished metallic components fabricated by additive manufacturing methods, and pave the way for functional surface design with practical application via the laser process. Full article
(This article belongs to the Special Issue Advances in Selective Laser Melting)
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Figure 1

Open AccessArticle
Study of Formed Oxides in IN718 Alloy during the Fabrication by Selective Laser Melting and Electron Beam Melting
Metals 2019, 9(1), 19; https://doi.org/10.3390/met9010019
Received: 14 November 2018 / Revised: 16 December 2018 / Accepted: 19 December 2018 / Published: 24 December 2018
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Abstract
This study confirmed that Al2O3 particles were formed in IN718 alloys during the fabrication by both selective laser melting (SLM) and electron beam melting (EBM). Different heat pattern and atmospheres in SLM and EBM result in different distribution and volume [...] Read more.
This study confirmed that Al2O3 particles were formed in IN718 alloys during the fabrication by both selective laser melting (SLM) and electron beam melting (EBM). Different heat pattern and atmospheres in SLM and EBM result in different distribution and volume fraction of Al2O3 particles. The Al2O3 oxides would act as nucleation sites for the precipitation of Nb/Ti carbides, leading to the formation of unique core-shell composites with Al2O3 in the center and Ti/Nb at the periphery. In order to investigate the oxygen content introduced during SLM and EBM, the volume fraction of Al2O3 formed in spark plasm sintering (SPS)-fabricated substrate, by consolidating the pre-oxidized IN718 raw powders at 800 °C, was utilized. The oxygen contents introduced to IN718 substrates during SLM and EBM fabrication were calculated to be 0.030 wt% and 0.099 wt%, respectively. Full article
(This article belongs to the Special Issue Advances in Selective Laser Melting)
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