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Materials Technologies: Additive Manufacturing and Functional Coatings
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Materials Technologies: Additive Manufacturing and Functional Coatings

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

Deadline for manuscript submissions: closed (10 August 2022) | Viewed by 7662

Special Issue Editors

Prof. Dr. Iskander Akhatov

E-Mail Website1 Website2
Guest Editor
Center for Design, Manufacturing & Materials (CDMM), Skolkovo Institute of Science & Technology, 121205 Moscow, Russia
Interests: multiphase and multiscale fluid dynamics; mathematical modeling; materials engineering; additive manufacturing; functional coatings; composite materials; materials structure and mechanical properties; atomistic modeling
Dr. Petr Zhilyaev

E-Mail Website
Guest Editor
Center for Design, Manufacturing & Materials (CDMM), Skolkovo Institute of Science & Technology, 121205 Moscow, Russia
Interests: molecular dynamics; density functional theory; phase transition; microstructure modeling; material science; additive manufacturing

Special Issue Information

Dear Colleagues,

Additive manufacturing and functional coatings are actively developing technologies driving fundamental and applied science and the engineering associated with them. The increasing power of laser sources, novel materials, and new automation and control systems are pushing the limits of the precision and possible  geometries of products. In order to better understand the physics behind these technologies, one needs to consider the interaction of matter with high-intensity energy flows, the hydrodynamics of the melt in welding baths, the phased transition from liquid to solid state, the formation of microstructure and properties at extreme speeds of heating and cooling, and much more. Understanding these fundamental issues uncovers new ways of technology optimization, which is a major demand of industry. 
This Special Issue will present a selection of the 10 best papers presented by young researchers at the International Conference on Beam Technologies and Laser Applications held on 20–22 September 2021 in Saint-Petersburg, Russia (https://btla.smtu.ru/en/). It will comprise articles which report new and progressive research results in the field of additive manufacturing and functional coatings, both from experimental and theoretical points of view. Manuscripts will be welcomed from both researchers of academia/universities and engineers/representatives of industrial companies.

Prof. Dr. Iskander Akhatov
Dr. Petr Zhilyaev
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. 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

  • additive manufacturing
  • functional coatings
  • interaction of laser radiation with matter
  • modeling of additive manufacturing processes
  • modeling of functional coatings
  • structure and mechanical properties of laser treated materials
  • optimization of additive manufacturing and functional coating processes

Published Papers (4 papers)

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Research

22 pages, 7675 KiB  
Article
Influence of Laser Beam Wobbling Parameters on Microstructure and Properties of 316L Stainless Steel Multi Passed Repaired Parts
by Artem Aleksandrovich Voropaev, Vladimir Georgievich Protsenko, Dmitriy Andreevich Anufriyev, Mikhail Valerievich Kuznetsov, Aleksey Alekseevich Mukhin, Maksim Nikolaevich Sviridenko and Sergey Vyacheslavovich Kuryntsev
Materials 2022, 15(3), 722; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15030722 - 18 Jan 2022
Cited by 5 | Viewed by 1606
Abstract
The results of experimental studies of repair of the supporting structure components made of 316L steel multi-pass laser cladding with filler wire are presented. The influence of the wobbling mode parameters, welding speed, and laser power on the formation of the deposited metal [...] Read more.
The results of experimental studies of repair of the supporting structure components made of 316L steel multi-pass laser cladding with filler wire are presented. The influence of the wobbling mode parameters, welding speed, and laser power on the formation of the deposited metal during multi-pass laser cladding with filler wire of 316L steel samples into a narrow slot groove, 6 mm deep and 3 mm wide, are shown. Non-destructive testing, metallographic studies, and mechanical tests of the deposited metal before and after heat treatment (2 h at 450 °C) were carried out. Based on the results of experimental studies, the optimal modes of laser beam wobbling were selected (amplitude—1.3 mm, frequency—100 Hz) at which the formation of a bead of optimal dimensions (height—1672 μm, width—3939 μm, depth of penetration into the substrate—776 μm) was ensured. A laser cladding technology with ESAB OK Autrode 316L filler wire has been developed, which has successfully passed the certification for conformity with the ISO 15614-11 standard. Studies of the chemical elements’ distribution before and after heat treatment showed that, after heat treatment along the grain boundaries, particles with a significantly higher Mo content (5.50%) were found in the sample, presumably precipitated phases. Microstructure studies and microhardness measurements showed that the upper part metal of the third pass, which has a lower microhardness (75% of base metal), higher ferrite content, and differently oriented dendritic austenite, significantly differs from the rest of the cladded metal. Full article
(This article belongs to the Special Issue Materials Technologies: Additive Manufacturing and Functional Coatings)
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20 pages, 9608 KiB  
Article
Spatiotemporal Evolution of Stress Field during Direct Laser Deposition of Multilayer Thin Wall of Ti-6Al-4V
by Sergei Ivanov, Antoni Artinov, Evgenii Zemlyakov, Ivan Karpov, Sergei Rylov and Vaycheslav Em
Materials 2022, 15(1), 263; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15010263 - 30 Dec 2021
Cited by 7 | Viewed by 1498
Abstract
The present work seeks to extend the level of understanding of the stress field evolution during direct laser deposition (DLD) of a 3.2 mm thick multilayer wall of Ti-6Al-4V alloy by theoretical and experimental studies. The process conditions were close to the conditions [...] Read more.
The present work seeks to extend the level of understanding of the stress field evolution during direct laser deposition (DLD) of a 3.2 mm thick multilayer wall of Ti-6Al-4V alloy by theoretical and experimental studies. The process conditions were close to the conditions used to produce large-sized structures by the DLD method, resulting in specimens having the same thermal history. A simulation procedure based on the implicit finite element method was developed for the theoretical study of the stress field evolution. The accuracy of the simulation was significantly improved by using experimentally obtained temperature-dependent mechanical properties of the DLD-processed Ti-6Al-4V alloy. The residual stress field in the buildup was experimentally measured by neutron diffraction. The stress-free lattice parameter, which is decisive for the measured stresses, was determined using both a plane stress approach and a force-momentum balance. The influence of the inhomogeneity of the residual stress field on the accuracy of the experimental measurement and the validation of the simulation procedure are analyzed and discussed. Based on the numerical results it was found that the non-uniformity of the through-thickness stress distribution reaches a maximum in the central cross-section, while at the buildup ends the stresses are distributed almost uniformly. The components of the principal stresses are tensile at the buildup ends near the substrate. Furthermore, the calculated equivalent plastic strain reaches 5.9% near the buildup end, where the deposited layers are completed, while the plastic strain is practically equal to the experimentally measured ductility of the DLD-processed alloy, which is 6.2%. The experimentally measured residual stresses obtained by the force-momentum balance and the plane stress approach differ slightly from each other. Full article
(This article belongs to the Special Issue Materials Technologies: Additive Manufacturing and Functional Coatings)
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16 pages, 5884 KiB  
Article
High-Power Fiber Laser Welding of High-Strength AA7075-T6 Aluminum Alloy Welds for Mechanical Properties Research
by Abdel-Monem El-Batahgy, Olga Klimova-Korsmik, Aleksandr Akhmetov and Gleb Turichin
Materials 2021, 14(24), 7498; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14247498 - 07 Dec 2021
Cited by 10 | Viewed by 2352
Abstract
The results disclosed that both the microstructure and mechanical properties of AA7075-T6 laser welds are considerably influenced by the heat input. In comparison with high heat input (arc welding), a smaller weld fusion zone with a finer dendrite arm spacing, limited loss of [...] Read more.
The results disclosed that both the microstructure and mechanical properties of AA7075-T6 laser welds are considerably influenced by the heat input. In comparison with high heat input (arc welding), a smaller weld fusion zone with a finer dendrite arm spacing, limited loss of alloying elements, less intergranular segregation, and reduced residual tensile stress was obtained using low heat input. This resulted in a lower tendency of porosity and hot cracking, which improved the welded metal’s soundness. Subsequently, higher hardness as well as higher tensile strength for the welded joint was obtained with lower heat input. A welded joint with better mechanical properties and less mechanical discrepancy is important for better productivity. The implemented high-power fiber laser has enabled the production of a low heat input welded joint using a high welding speed, which is of considerable importance for minimizing not only the fusion zone size but also the deterioration of its properties. In other words, high-power fiber laser welding is a viable solution for recovering the mechanical properties of the high-strength AA 7075-T6 welds. These results are encouraging to build upon for further improvement of the mechanical properties to be comparable with the base metal. Full article
(This article belongs to the Special Issue Materials Technologies: Additive Manufacturing and Functional Coatings)
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11 pages, 10175 KiB  
Article
Structure and Mechanical Properties of Shipbuilding Steel Obtained by Direct Laser Deposition and Cold Rolling
by Ruslan Mendagaliyev, Oleg Zotov, Rudolf Korsmik, Grigoriy Zadykyan, Nadezhda Lebedeva and Olga Klimova-Korsmik
Materials 2021, 14(23), 7393; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14237393 - 02 Dec 2021
Viewed by 1495
Abstract
The study of the formation of microstructural features of low-alloy bainite-martensitic steel 09CrNi2MoCu are of particular interest in additive technologies. In this paper, we present a study of cold-rolled samples after direct laser deposition (DLD). We investigated deposited samples after cold plastic deformation [...] Read more.
The study of the formation of microstructural features of low-alloy bainite-martensitic steel 09CrNi2MoCu are of particular interest in additive technologies. In this paper, we present a study of cold-rolled samples after direct laser deposition (DLD). We investigated deposited samples after cold plastic deformation with different degrees of deformation compression (50, 60 and 70%) of samples from steel 09CrNi2MoCu. The microstructure and mechanical properties of samples in the initial state and after heat treatment (HT) were analyzed and compared with the samples obtained after cold rolling. The effect on static tensile strength and impact toughness at −40 °C in the initial state and after cold rolling was investigated. The mechanical properties and characteristics of fracture in different directions were determined. Optimal modes and the degree of cold rolling deformation compression required to obtain balanced mechanical properties of samples obtained by additive method were determined. The influence of structural components and martensitic-austenitic phase on the microhardness and mechanical properties of the obtained samples was determined. Full article
(This article belongs to the Special Issue Materials Technologies: Additive Manufacturing and Functional Coatings)
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