Laser Additive Manufacturing of Metallic Materials, 2nd Edition

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "D3: 3D Printing and Additive Manufacturing".

Deadline for manuscript submissions: 30 May 2024 | Viewed by 933

Special Issue Editors


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Guest Editor
School of Materials Science and Engineering, Beihang University, Beijing 100191, China
Interests: metallic additive manufacturing; near-net-shape hot isostatic pressing; nickel-based superalloys; titanium-based alloys
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Guest Editor
Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, NJ 07030, USA
Interests: surface modification; additive manufacturing of metals; nanofabrication; nanostructured materials; interfacial phenomena (wetting; adhesion; friction; icing; corrosion, etc.)
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Metallic additive manufacturing has garnered significant interest in both industry and academia in the past decade. The small-melt-pool-based layered additive manufacturing process not only demonstrates exceptional near-net-shape manufacturing capability but can also generate numerous novel metallurgical phenomena in a great number of metallic materials due to its unique processing characteristics, such as complex laser-material interaction, a steep thermal gradient within melt pools, rapid solidification, and cooling. Non-equilibrium or novel microstructures are often produced in this process, leading to an improved mechanical performance. This opens up the possibility for further improvement in the properties of existing metallic materials and for the development and synthesis of new metallic materials with enhanced properties through alloy design and process optimization. Meanwhile, defects, stress, and microstructural control pose significant challenges to the widespread industrial application of this process.

This Special Issue seeks research papers and review articles focused on the novel development of metallic additive manufacturing. The scope covers all relevant topics, including (but not limited to) laser-material interaction; melt flow behavior; process modeling; porosity formation mechanism; cracking mechanism; novel metallurgical phenomena; new microstructural and mechanical property development; defect and microstructural control; stress development and control; novel metallic material development; new structural design and fabrication; and new applications.

Prof. Dr. Chunlei Qiu
Prof. Dr. Chang-Hwan Choi
Guest Editors

Manuscript Submission Information

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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

  • metallic additive manufacturing
  • 3D printing
  • microstructural control
  • new material development

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Published Papers (1 paper)

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Research

21 pages, 5142 KiB  
Article
On the Role of ZrN Particles in the Microstructural Development in a Beta Titanium Alloy Processed by Laser Powder Bed Fusion
by Xu Chen and Chunlei Qiu
Micromachines 2024, 15(1), 104; https://doi.org/10.3390/mi15010104 - 5 Jan 2024
Viewed by 744
Abstract
Additive manufacturing of titanium alloys usually ends up with large columnar grains due to the steep thermal gradients within melt pools during solidification. In this study, ZrN particles were added into a beta titanium alloy, Ti-10V-2Fe-3Al, with the aim of promoting columnar-to-equiaxed grain [...] Read more.
Additive manufacturing of titanium alloys usually ends up with large columnar grains due to the steep thermal gradients within melt pools during solidification. In this study, ZrN particles were added into a beta titanium alloy, Ti-10V-2Fe-3Al, with the aim of promoting columnar-to-equiaxed grain transition during laser bed powder fusion (L-PBF). It was found that the addition of ZrN leads to the development of alternate layers of equiaxed grains and refined columnar grains, which is in sharp contrast to the dominant large columnar grains formed in the pure L-PBF-processed titanium alloy. An investigation on single laser melted tracks revealed that the sample with added ZrN showed fine equiaxed grains in the upper regions of solidified melt pools and columnar grains in the lower regions, whereas the solidified melt pools of the pure titanium alloy were dominated by large columnar grains due to epitaxial growth from the previous layer. The formation of equiaxed grains in the former sample is attributed to multiple factors including an increased gradient of liquidus temperature due to the solution of N and a reduced actual melt temperature gradient due to the melting of high-melting-point ZrN particles, which would have expanded constitutional undercooling, a grain growth restriction effect induced by the segregation of N along grain boundaries and the accumulation of unmelted ZrN particles in the upper regions of melt pools. The addition of ZrN also resulted in significant α precipitation, which showed strong variant selection and was found to be driven by laser reheating and the N solution in the matrix. Full article
(This article belongs to the Special Issue Laser Additive Manufacturing of Metallic Materials, 2nd Edition)
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