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Laser Technology for Materials Processing
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Laser Technology for Materials Processing

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Manufacturing Processes and Systems".

Deadline for manuscript submissions: 20 September 2025 | Viewed by 3278

Special Issue Editor

Dr. Nuno Ferreira

E-Mail Website
Guest Editor
i3N and Department of Physics, University of Aveiro, 3810-193 Aveiro, Portugal
Interests: crystal growth; surface modifications; oxide materials; electrical properties; materials for energy harvesting
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Since its discovery (~1950), the laser has been widely applied in industry, also being the topic of numerous research projects and over 500 k scientific publications in the last 5 years. This research has been increasing over the years, due to the laser's ability to change the properties of a wide range of materials. This technology presents the advantage of the control of laser parameters such as energy, duration and shape/geometry, resulting in the almost total control of the process to locally change the material structure at the surface or even in bulk, an advantage for existing technologies. It is well known that the interaction of a laser beam with materials can result in many industrial applications such as oxide/ceramics, metals, polymers and wood materials.

A large scientific community of chemists, physicists and materials scientists are seeking ways of improving laser applications for new materials and devices. In this Special Issue, we will collect the newest advances in laser research, including new processing techniques, material designs, characterization, etc. From this Special Issue, readers will obtain up-to-date information on the recent progress in laser technology for materials processing. 

Dr. Nuno Ferreira
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

  • laser processing
  • bulk melting
  • laser sintering
  • surface modifications
  • laser ablation
  • nanoparticles
  • atmospheres
  • improvements in surface adhesion

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Published Papers (3 papers)

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Research

17 pages, 13254 KiB  
Article
Research on Laser Cleaning of Graphite Lubrication Coating on the Magnesium Alloy Surface
by Zhenhai Xu, Yunhui Yue, Donghe Zhang, Shaoxi Xue, Erju Liu, Debin Shan, Jie Xu and Bin Guo
Materials 2025, 18(3), 484; https://doi.org/10.3390/ma18030484 - 21 Jan 2025
Viewed by 686
Abstract
The lubricating coating must be removed from the forged or stamped workpieces. Developing environment-friendly and high-precision cleaning technology is necessary. In this study, a nanosecond pulsed laser was used to clean the graphite lubricating coating of 15 μm thickness on the surface of [...] Read more.
The lubricating coating must be removed from the forged or stamped workpieces. Developing environment-friendly and high-precision cleaning technology is necessary. In this study, a nanosecond pulsed laser was used to clean the graphite lubricating coating of 15 μm thickness on the surface of an MB15 magnesium alloy. The effects of various laser cleaning parameters on the cleaning quality and the cleaning mechanism were studied. When the laser fluence (F) increases from 1.27 to 7.64 J/cm2, the clearance rate increases, and the surface roughness initially decreases before increasing. When the pulse frequency (f) increases from 10 to 30 kHz, the single-pulse energy decreases, the clearance rate decreases, and the surface roughness increases. When the scanning speed (v) increases from 1000 to 5000 mm/s, the spot overlap rate decreases, the clearance rate decreases, and the surface roughness firstly decreases and then increases. The optimal cleaning parameter combinations are F = 3.82 J/cm2, f = 10 kHz, and v = 3000 mm/s. The graphite lubrication coating was almost completely removed without damaging the substrate surface, and the surface carbon content of the sample was decreased to 6.42%. The laser cleaning mechanism of the graphite lubricating coating on the magnesium alloy surface is dominated by thermal ablation. As the laser fluence increases, the physical and chemical reactions become more violent. Full article
(This article belongs to the Special Issue Laser Technology for Materials Processing)
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20 pages, 11839 KiB  
Article
Effect of Hardness Distribution on Strength of Narrow-Gap Hot-Wire Laser-Welded Joint for High-Tensile Strength Steel
by Jukkapun Greebmalai, Kazuyuki Matsumoto, Keita Marumoto and Motomichi Yamamoto
Materials 2025, 18(2), 297; https://doi.org/10.3390/ma18020297 - 10 Jan 2025
Viewed by 604
Abstract
Application of high-heat input welding on high-tensile strength steels causes deterioration of mechanical properties of the welded joint, due to softening and grain coarsening in the heat-affected zone (HAZ). In this study, low-heat input narrow-gap hot-wire laser welding was applied to 12 mm [...] Read more.
Application of high-heat input welding on high-tensile strength steels causes deterioration of mechanical properties of the welded joint, due to softening and grain coarsening in the heat-affected zone (HAZ). In this study, low-heat input narrow-gap hot-wire laser welding was applied to 12 mm thick 780 MPa-class high-tensile strength steel plate. Conditions were optimized based on microstructural observations of joints produced at various welding speeds. Heat input was estimated from measured grain size. Evaluation of properties of joints welded at 0.5 m/min revealed sound toughness, tensile strength, and elongation. The effect of undermatched weld metal width on joint strength was analyzed using a finite element method. When the width of undermatched weld metal was 2.5 mm, the joint strength was 99% of the base metal strength; when it was 7.5 mm, the strength dropped to 95%. The effect of HAZ softening width on joint strength with even-matched weld metals was similarly analyzed, showing that even when the HAZ softening width was 2.0 mm, the joint strength was 98% of the base metal strength. The results of this study suggest that narrow-gap hot-wire laser welding can efficiently reduce heat input and the HAZ softening zone, thereby achieving both high strength and high toughness. Full article
(This article belongs to the Special Issue Laser Technology for Materials Processing)
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18 pages, 13276 KiB  
Article
Microstructural Investigation of Process Parameters Dedicated to Laser Powder Bed Fusion of AlSi7Mg0.6 Alloy
by Janusz Kluczyński, Tomáš Dražan, Zdeněk Joska, Jakub Łuszczek, Robert Kosturek and Katarzyna Jasik
Materials 2024, 17(9), 2156; https://doi.org/10.3390/ma17092156 - 5 May 2024
Cited by 1 | Viewed by 1451
Abstract
This study presents a microstructural investigation of the printing parameters of an AlSi7Mg0.6 alloy produced by powder bed fusion (PBF) using laser beam melting (LB/M) technology. The investigation focused on the effects of laser power, exposure velocity, and hatching distance on the microhardness, [...] Read more.
This study presents a microstructural investigation of the printing parameters of an AlSi7Mg0.6 alloy produced by powder bed fusion (PBF) using laser beam melting (LB/M) technology. The investigation focused on the effects of laser power, exposure velocity, and hatching distance on the microhardness, porosity, and microstructure of the produced alloy. The microstructure was characterized in the plane of printing on a confocal microscope. The results showed that the printing parameters significantly affected the microstructure, whereas the energy density had a major effect. Decreasing the laser power and decreasing the hatching distance resulted in increased porosity and the increased participation of non-melted particles. A mathematical model was created to determine the porosity of a 3D-printed material based on three printing parameters. Microhardness was not affected by the printing parameters. The statistical model created based on the porosity investigation allowed for the illustration of the technological window and showed certain ranges of parameter values at which the porosity of the produced samples was at a possible low level. Full article
(This article belongs to the Special Issue Laser Technology for Materials Processing)
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