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Micromachines
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Fundamentals and Applications of Light-Matter Interactions in Laser Metal Additive...
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Fundamentals and Applications of Light-Matter Interactions in Laser Metal Additive Manufacturing

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "D：Materials and Processing".

Deadline for manuscript submissions: closed (31 May 2023) | Viewed by 3140

Special Issue Editor

Dr. Thejaswi Tumkur

E-Mail Website
Guest Editor
Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
Interests: laser-based manufacturing; metal 3D printing; laser beam shaping; optical materials

Special Issue Information

Dear Colleagues,

Additive manufacturing (AM) has largely fueled the next industrial revolution by redefining how objects are fabricated and manufactured. In particular, laser metal AM allows for rapid prototyping and printing complex geometries with tailored microstructures and mechanical properties, beyond the realm of conventional manufacturing. The aim of this Special Issue is to showcase exciting research focusing on fundamental phenomena that govern laser metal AM techniques across broad spatiotemporal regimes, and applications involving novel metals and alloys, as well as complex geometries. Topics of interest include optical and thermal engineering strategies (such as laser beam shaping, multibeam processing and in situ annealing) to improve process productivity and print quality, advanced diagnostic techniques combined with correlative and predictive (including machine learning and AI) approaches for improved process monitoring and feedback control, and physics-based modeling approaches to capture complex process dynamics at multiple length scales. In addition, this Special Issue seeks to highlight the potential of metal AM for several current and future applications involving multimaterial systems and complex geometries for functionality in harsh environments. It is my pleasure to invite you to submit full papers, communications, or review articles to this Special Issue.

Dr. Thejaswi Tumkur
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. Micromachines 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

  • laser beam shaping
  • in situ process monitoring
  • advanced diagnostics and feedback control techniques
  • predictive (AI and machine learning) correlative data analysis
  • materials simulation, modeling and design
  • materials for harsh environments

Published Papers (2 papers)

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Research

14 pages, 7438 KiB  
Article
Research on Residual Stresses and Microstructures of Selective Laser Melted Ti6Al4V Treated by Thermal Vibration Stress Relief
by Shuguang Chen, Jinlong Ma, Hanjun Gao, Yesong Wang and Xun Chen
Micromachines 2023, 14(2), 354; https://doi.org/10.3390/mi14020354 - 31 Jan 2023
Cited by 3 | Viewed by 1492
Abstract
The efficient and cost-effective residual stress control method is of great significance for the application of additive manufacturing (AM) technology. In this work, thermal-vibration stress relief (TVSR) with different temperatures and dynamic stresses was performed on Ti6Al4V samples prepared by selective laser melting [...] Read more.
The efficient and cost-effective residual stress control method is of great significance for the application of additive manufacturing (AM) technology. In this work, thermal-vibration stress relief (TVSR) with different temperatures and dynamic stresses was performed on Ti6Al4V samples prepared by selective laser melting (SLM), the stress relief effects of TVSR and its influence on phase and microstructure were investigated and compared with thermal stress relief (TSR) and vibration stress relief (VSR), and the stress relief mechanisms of these methods are discussed. It was found that the residual stress relief rate can reach 86.76% after TVSR treatment at a temperature of 380 °C and a dynamic stress of 400 MPa, which increased by 63.63% compared with VSR under the same dynamic stress. The efficiency is increased by 76% compared with TSR at 580 °C and the residual stress relief rate is almost the same. After TVSR, VSR and TSR treatments, the grain morphology, size and phase content of samples were basically unchanged, and low-angle grain boundaries (LAGBs) were increased after TVSR and VSR treatments and decreased after TSR treatment. The results confirm that the TVSR method has the ability to control the residual stress of selective laser melted Ti6Al4V with low time and cost consumption, and are helpful for engineering applications of TVSR. Full article
(This article belongs to the Special Issue Fundamentals and Applications of Light-Matter Interactions in Laser Metal Additive Manufacturing)
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12 pages, 2663 KiB  
Article
Additive Nanosecond Laser-Induced Forward Transfer of High Antibacterial Metal Nanoparticle Dose onto Foodborne Bacterial Biofilms
by Alena Nastulyavichus, Liliana Khaertdinova, Eteri Tolordava, Yulia Yushina, Andrey Ionin, Anastasia Semenova and Sergey Kudryashov
Micromachines 2022, 13(12), 2170; https://doi.org/10.3390/mi13122170 - 8 Dec 2022
Cited by 3 | Viewed by 1093
Abstract
Additive laser-induced forward transfer (LIFT) of metal bactericidal nanoparticles from a polymer substrate directly onto food bacterial biofilms has demonstrated its unprecedented efficiency in combating pathogenic microorganisms. Here, a comprehensive study of laser fluence, metal (gold, silver and copper) film thickness, and the [...] Read more.
Additive laser-induced forward transfer (LIFT) of metal bactericidal nanoparticles from a polymer substrate directly onto food bacterial biofilms has demonstrated its unprecedented efficiency in combating pathogenic microorganisms. Here, a comprehensive study of laser fluence, metal (gold, silver and copper) film thickness, and the transfer distance effects on the antibacterial activity regarding biofilms of Gram-negative and Gram-positive food bacteria (Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli, Listeria monocytogenes, Salmonella spp.) indicated the optimal operation regimes of the versatile modality. LIFT-induced nanoparticle penetration into a biofilm was studied by energy-dispersion X-ray spectroscopy, which demonstrated that nanoparticles remained predominantly on the surface of the biofilm. Full article
(This article belongs to the Special Issue Fundamentals and Applications of Light-Matter Interactions in Laser Metal Additive Manufacturing)
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