Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
3.6
2.670
Journals
Crystals
Special Issues
Anisotropic/ Isotropic Microstructural Design in Additive Manufacturing
share announcement

Special Issue "Anisotropic/ Isotropic Microstructural Design in Additive Manufacturing"

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: 31 December 2023 | Viewed by 3481

Special Issue Editors

Dr. Ozkan Gokcekaya

E-Mail Website
Guest Editor
Anisotropic Design & Additive Manufacturing Research Center, Osaka University, Osaka, Japan
Interests: additive manufacturing; biomaterials; coatings; microstructure; crystallographic orientation
Prof. Dr. Takayoshi Nakano

E-Mail Website
Guest Editor
Distinguished Professor in Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
Interests: additive manufacturing; matal 3d printing; biomaterials; bone substitute; crystallographic texture; deformation mechanism; regenerative medicine; biomimetic materials; implantology
Special Issues, Collections and Topics in MDPI journals
Dr. Evren Yasa

E-Mail Website
Guest Editor
Department of Mechanical Engineering, Eskisehir Osmangazi University, 26040 Eskisehir, Turkey
Interests: metal additive manufacturin; Laser/Electron beam powder bed fusion; material characterisation; process development

Special Issue Information

Dear Colleagues,

Additive manufacturing (AM) techniques, feasible for use in customized, small-scale production, are new and significant replacements for traditional manufacturing technologies.

Despite the many advantages of AM methods, including design flexibility, the production of functionally graded parts, and a significantly lower buy-to-fly ratio, aspects such as the development of high residual stresses, and potentially, the formation of detrimental phases and defects in additively manufactured parts, are a matter of concern. Thus, further research is required to overcome the many challenges that AM methods face today.

This Special Issue aims to provide new ideas and present the latest advances in the AM of metallic materials, with a particular emphasis on anisotropic/isotropic microstructural design, in order to optimize structural/functional properties and promote applications of AM.

Topics of interest include, but are not limited to, a novel design for AM, new applications of AM processes, alloy design, the AM of single crystals, tailoring microstructures (anisotropic/isotropic), customized structural/functional properties, serviceability, the prevention/understanding of micro- and mesoscale defects, residual stresses and distortion, pre-/post-processing technologies and approaches, applications of finite element modeling, and machine learning in AM methodology.

Dr. Ozkan Gokcekaya
Prof. Dr. Takayoshi Nakano
Dr. Evren Yasa
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 2000 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 of metals and alloys
  • Processing–structure–properties relations
  • Processing optimization
  • Anisotropic/isotropic microstructure
  • Customized properties
  • Defect formation
  • Residual stresses and distortion
  • Post-processing
  • Finite element analysis
  • Machine learning

Published Papers (3 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

get_app
Article
Design of Titanium Alloys Insensitive to Thermal History for Additive Manufacturing
by
Masato Ueda
,
Chang Ting Hsuan
,
Masahiko Ikeda
and
Takayoshi Nakano
Crystals 2023, 13(4), 568; https://doi.org/10.3390/cryst13040568 - 27 Mar 2023
Viewed by 535
Abstract
Powder bed fusion is the most common technology used for 3D printing, where thermal energy is used to selectively melt/sinter granular materials into solid shapes. The build platform is then lowered, more powder is added, and the process is repeated for the next [...] Read more.
Powder bed fusion is the most common technology used for 3D printing, where thermal energy is used to selectively melt/sinter granular materials into solid shapes. The build platform is then lowered, more powder is added, and the process is repeated for the next layer to fully print the design. As a result, the built-up part is repeatedly heated. Therefore, materials that are not sensitive to thermal history are preferred for this process. The Ti–Zr system forms a continuous solid solution for both β- and α-phases. The presence of Fe in Ti alloys is inevitable; however, it provides some beneficial effects. The purpose of this work was to prepare Ti–Zr–Fe alloys and investigate their heat treatment behaviour. Ti-xmass%Zr-1mass%Fe alloys (x = 0, 5, 10) were prepared with arc melting. The formation of a solid solution of Zr in Ti was confirmed on the basis of X-ray diffraction peak shifts and hardening effects. A small amount of β-phase precipitation was suggested by the change in electrical resistivity after isothermal ageing at 673 and 773 K. However, no obvious phase or microstructural changes were observed. The laser scanning increased the volume of the precipitates and also coarsened them, but the effect was limited. Full article
(This article belongs to the Special Issue Anisotropic/ Isotropic Microstructural Design in Additive Manufacturing)
►▼ Show Figures

Figure 1

get_app
Article
Effects of Scanning Strategy on the Microstructure and Mechanical Properties of Sc-Zr-Modified Al–Mg Alloy Manufactured by Laser Powder Bed Fusion
by
Yusufu Ekubaru
,
Ozkan Gokcekaya
and
Takayoshi Nakano
Crystals 2022, 12(10), 1348; https://doi.org/10.3390/cryst12101348 - 24 Sep 2022
Cited by 1 | Viewed by 997
Abstract
Laser powder bed fusion (LPBF)-manufactured Sc-Zr-modified Al–Mg alloy (Scalmalloy) has a bimodal microstructure comprising coarse grains (CGs) in the hot melt pool area and ultrafine grains (UFGs) along the melt pool boundaries (MPBs). Owing to these microstructural features, an increase in the MPBs [...] Read more.
Laser powder bed fusion (LPBF)-manufactured Sc-Zr-modified Al–Mg alloy (Scalmalloy) has a bimodal microstructure comprising coarse grains (CGs) in the hot melt pool area and ultrafine grains (UFGs) along the melt pool boundaries (MPBs). Owing to these microstructural features, an increase in the MPBs can increase the UFGs, leading to enhanced mechanical properties. However, the effects of the LPBF process parameters, especially the laser scan strategy, on the microstructure and mechanical properties of Scalmalloy are still unclear. Here, a comparative study was conducted between X- and XY-mode laser scan strategies, with the same volumetric energy, based on the melt pool configuration, grain size distribution, and precipitation behaviors. The X-scan exhibited mechanical properties superior to those exhibited by the XY-scan, attributed to the higher volume fraction (VF) of UFGs. An increase in the VF of UFGs was observed, from 46% for the XY-scan to 56% for the X-scan, owing to an increase in MPBs. Consequently, the tensile strength of the X-scan was higher than that of the XY-scan. The maximum yield strength (271.5 ± 2.7 MPa) was obtained for the X-scan strategy, which was approximately twice that obtained for casting. The results of this study demonstrate that the microstructure and mechanical properties of Scalmalloy can be successfully tuned by a laser scanning strategy. Full article
(This article belongs to the Special Issue Anisotropic/ Isotropic Microstructural Design in Additive Manufacturing)
►▼ Show Figures

Figure 1

get_app
Article
Effects of Recrystallization on Tensile Anisotropic Properties for IN738LC Fabricated by Laser Powder Bed Fusion
by
Shinya Hibino
,
Kazushige Fujimitsu
,
Makoto Azuma
,
Takuya Ishimoto
and
Takayoshi Nakano
Crystals 2022, 12(6), 842; https://doi.org/10.3390/cryst12060842 - 15 Jun 2022
Viewed by 1246
Abstract
This study demonstrates the effects of recrystallization on tensile properties and the anisotropy of IN738LC, a typical γ’ precipitation-strengthened alloy, at both room and high temperatures via the laser powder bed fusion process. The nonrecrystallized columnar microstructure, subjected to standard IN738LC heat treatment [...] Read more.
This study demonstrates the effects of recrystallization on tensile properties and the anisotropy of IN738LC, a typical γ’ precipitation-strengthened alloy, at both room and high temperatures via the laser powder bed fusion process. The nonrecrystallized columnar microstructure, subjected to standard IN738LC heat treatment up to 1120 °C, and the almost fully recrystallized microstructure, heat-treated at 1204 °C, were compared. The tensile properties strongly depend on whether recrystallization was completed as well as the tensile direction. This can be explained by microstructure characterization, featuring the Taylor factor in the tensile direction, average grain size estimated by ellipse approximation, and the relationship between the grain shape and tensile direction. The shape of the recrystallized grains and the distribution of coarse MC carbides inside the recrystallized grains were determined by the microstructure in an as-built state. In high-temperature tensile tests conducted in the horizontal direction, the separation of the columnar grains caused a brittle fracture. In contrast, dimples were observed at the fracture surface after recrystallization, indicating scope for further improvement in ductility. Full article
(This article belongs to the Special Issue Anisotropic/ Isotropic Microstructural Design in Additive Manufacturing)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-3
Back to TopTop