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Crystals
Special Issues
Laser-Induced Surface Modification
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Laser-Induced Surface Modification

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystal Engineering".

Deadline for manuscript submissions: closed (25 August 2023) | Viewed by 4646

Special Issue Editors

Dr. Liang Lan

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Guest Editor
School of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
Interests: additive manufacturing; laser shock peening; microstructural characterization
Dr. Haifeng Yang

E-Mail Website
Guest Editor
School of Mechanical and Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China
Interests: laser cladding; impact wear; wear resistant coating; impact strengthening; hardening behavior
Special Issues, Collections and Topics in MDPI journals
Dr. Guoxin Lu

E-Mail Website
Guest Editor
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Jinan, China
Interests: laser materials processing; materials engineering; manufacturing engineering; metallurgical engineering
Dr. Shuang Gao

E-Mail Website
Guest Editor
School of Material Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
Interests: Ni-based superalloy; metal additive manufacturing; microstructure evolution; mechanical property
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Due to the unique properties of laser, since its development in the middle of the 20th century, it has been widely used in science and technology research and industrial production. Laser surface modification is a new application of laser in the field of surface technology which can greatly improve the hardness, wear resistance, and corrosion resistance of metal materials’ surfaces. The microstructure formed after laser melting has high chemical uniformity and a very fine grain, which strengthens the alloy and greatly improves wear resistance. Therefore, in the field of surface treatment, the research and development of laser surface modification is quite active. After decades of development, laser surface modification technology, such as laser shock processing, laser quenching, femtosecond laser processing, and laser cladding, has been widely applied to aerospace, petrochemical, energy, transportation, metallurgy, and other fields. In this Special Issue, studies on recent advances in laser-induced surface modification of metallic parts formed through conventional  or additive manufacturing is welcome.

Dr. Liang Lan
Dr. Haifeng Yang
Dr. Guoxin Lu
Dr. Shuang Gao
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. Crystals 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 surface modification
  • laser shock processing
  • laser cladding
  • femtosecond laser processing
  • additive manufacturing

Published Papers (3 papers)

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Research

15 pages, 15439 KiB  
Article
Effect of Ultrasonic Rolling on the Organization and Properties of a High-Speed Laser Cladding IN 718 Superalloy Coating
by Jingbin Hao, Qingwei Niu, Haowen Ji and Hao Liu
Crystals 2023, 13(8), 1214; https://doi.org/10.3390/cryst13081214 - 5 Aug 2023
Cited by 10 | Viewed by 1069
Abstract
To repair or improve the performance of H13 hot working molds through the additive manufacturing process, IN 718 was coated on H13 die steel by high-speed laser cladding followed by an ultrasonic surface rolling process (USRP). The mechanism of ultrasonic surface rolling on [...] Read more.
To repair or improve the performance of H13 hot working molds through the additive manufacturing process, IN 718 was coated on H13 die steel by high-speed laser cladding followed by an ultrasonic surface rolling process (USRP). The mechanism of ultrasonic surface rolling on the mechanical properties of the coating was studied. After USRP, the coating exhibited severe plastic deformation; the microscopic organization of the surface layer was refined and the particle size was significantly reduced. The violent plastic deformation of the coating caused by USRP improved the dislocation density and the grain boundary density, providing an improved yield strength of the coating and improving the high-temperature wear resistance of the coating. After USRP, the surface hardness of the coating increased by 30%. Compared with the coating without USRP, the wear resistance of the coating greatly improved; the wear rate was reduced by 51% and the wear mechanism of the coating changed from large-area adhesive wear and severe abrasive wear to small-area adhesive wear and slight abrasive wear. The IN 718 coating after USRP had a higher hardness and greater wear resistance, significantly improving the service life of H13 steel. Full article
(This article belongs to the Special Issue Laser-Induced Surface Modification)
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15 pages, 5058 KiB  
Article
Microstructure and Solute Concentration Analysis of Epitaxial Growth during Wire and Arc Additive Manufacturing of Aluminum Alloy
by Ruwei Geng, Yanhai Cheng, Luqiang Chao, Zhengying Wei and Ninshu Ma
Crystals 2023, 13(5), 776; https://doi.org/10.3390/cryst13050776 - 6 May 2023
Cited by 3 | Viewed by 1350
Abstract
Microstructure and solute distribution have a significant impact on the mechanical properties of wire and arc additive manufacturing (WAAM) deposits. In this study, a multiscale model, consisting of a macroscopic finite element (FE) model and a microscopic phase field (PF) model, was used [...] Read more.
Microstructure and solute distribution have a significant impact on the mechanical properties of wire and arc additive manufacturing (WAAM) deposits. In this study, a multiscale model, consisting of a macroscopic finite element (FE) model and a microscopic phase field (PF) model, was used to predict the 2319 Al alloy microstructure evolution with epitaxial growth. Temperature fields, and the corresponding temperature gradient under the selected process parameters, were calculated by the FE model. Based on the results of macroscopic thermal simulation on the WAAM process, a PF model with a misorientation angle was employed to simulate the microstructure and competitive behaviors under the effect of epitaxial growth of grains. The dendrites with high misorientation angles experienced competitive growth and tended to be eliminated in the solidification process. The inclined dendrites are commonly hindered by other grains in front of the dendrite tip. Moreover, the solute enrichment near the solid/liquid interface reduced the driving force of solidification. The inclined angle of dendrites increased with the misorientation angle, and the solute distributions near the interface had similar patterns, but various concentrations, with different misorientation angles. Finally, metallographic experiments were conducted on the WAAM specimen to validate the morphology and size of the dendrites, and electron backscattered diffraction was used to indicate the preferred orientation of grains near the fusion line, proving the existence of epitaxial growth. Full article
(This article belongs to the Special Issue Laser-Induced Surface Modification)
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19 pages, 7729 KiB  
Article
Study on Surface Roughness Improvement of Selective Laser Melted Ti6Al4V Alloy
by Di Wang, Jiale Lv, Xiongmian Wei, Dong Lu and Chen Chen
Crystals 2023, 13(2), 306; https://doi.org/10.3390/cryst13020306 - 13 Feb 2023
Cited by 7 | Viewed by 1848
Abstract
To improve the surface quality of Ti6Al4V parts formed by selective laser melting (SLM), this paper systematically studies the effects of laser power, scanning speed and inclination angle on the different surface morphology and roughness of parts. On this basis, the effect of [...] Read more.
To improve the surface quality of Ti6Al4V parts formed by selective laser melting (SLM), this paper systematically studies the effects of laser power, scanning speed and inclination angle on the different surface morphology and roughness of parts. On this basis, the effect of surface remelting and multi-layer profile scanning process strategies on improving the surface quality of parts is explored. The upper surface roughness varies parabolically with increasing line energy density, the line energy density value that minimizes the upper surface roughness is around 0.22 J/mm, and the minimum Ra value is 4.41 μm. The roughness of upper and lower sides increases significantly with the increase in scanning speed. As the inclination angle increases, the roughness of the upper and lower sides gradually decreases, which is caused by the combined influence of powder adhesion and step effect. The surface remelting process strategy can reduce the upper surface roughness by 35.68% and reduce its Ra value to 2.65 μm. The multi-layer profile scanning process strategy can reduce the upper side and vertical side roughness by more than 50%, down to Ra 5.10 μm and Ra 4.61 μm, respectively. Full article
(This article belongs to the Special Issue Laser-Induced Surface Modification)
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