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Advances in Materials Joining and Additive Manufacturing (2nd Edition)

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

Deadline for manuscript submissions: 20 October 2024 | Viewed by 2523

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Dr. Xiaochao Liu

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Guest Editor

School of Mechanical Engineering, Southeast University, Nanjing, China
Interests: welding; joining; additive manufacturing; modelling; friction stir welding; friction stir additive manufacturing
Special Issues, Collections and Topics in MDPI journals

Prof. Dr. Lei Shi

E-Mail Website
Guest Editor

School of Materials Science and Engineering, Shandong University, Shandong, China
Interests: numerical simulation; friction stir welding; phase field simulation; additive manufacturing; welding and joining
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With the increasingly potent energy problem, the modern manufacturing industry pays increasing attention to energy conservation and emission reduction. As widely used manufacturing processes, material joining and additive manufacturing could be important in energy saving and emission reduction. Therefore, continually developing new material joining and additive manufacturing techniques to improve manufacturing efficiency and quality and save energy is an eternal pursuit for researchers. Our colleagues have recently made many advances in material joining and additive manufacturing. Summarizing these new techniques and mechanisms is necessary to further promote energy conservation and emission reduction in the manufacturing industry.

The main purpose of this Special Issue is to collect the advances in material joining and additive manufacturing aspects. The main content of this Special Issue includes but is not limited to, arc welding, high energy beam welding, brazing, diffusion welding, friction welding, friction stir welding, laser additive manufacturing, electron-beam additive manufacturing, wire arc additive manufacturing, friction stir additive manufacturing, cold spraying additive manufacturing, and their modeling techniques.

The first volume of this Special Issue received widespread attention from scholars and included many excellent contributions. Given this, we want to create a second volume to continue collecting feature papers.

We invite you to submit your article for the Special Issue "Advances in Materials Joining and Additive Manufacturing” of the MDPI journal Materials.

Dr. Xiaochao Liu
Prof. Dr. Lei Shi
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

fusion welding
solid-state welding
fusion-based additive manufacturing
solid-state additive manufacturing
numerical simulation
laser additive manufacturing
electron-beam additive manufacturing

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Research

22 pages, 7876 KiB

Open AccessArticle

Grain Microstructure in Friction-Stir-Welded Dissimilar Al/Mg Joints of Thin Sheets with/without Ultrasonic Vibration

by Jialin Yin, Jie Liu and Chuansong Wu

Materials 2024, 17(19), 4874; https://doi.org/10.3390/ma17194874 - 4 Oct 2024

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Abstract

Electron backscattered diffraction (EBSD) characterization was conducted on the typical regions in friction-stir-welded dissimilar Al/Mg joints of 2 mm thick sheets with/without ultrasonic assistance. The effects of ultrasonic vibration (UV) on the grain size, recrystallization mechanisms, and degree of recrystallization on both sides of the Al-Mg bonding interface and the intermetallic compounds (IMCs) were investigated. It was found that on the Mg side of the weld nugget zone (WNZ), the primary dynamic recrystallization (DRX) mechanisms were discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX), with geometric dynamic recrystallization (GDRX) playing a secondary role. On the Al side of the WNZ, CDRX was identified as the primary mechanism, with GDRX as a secondary contributor. While UV did not significantly alter the DRX mechanisms in either alloy within the WNZ, it promoted the aggregation and rearrangement of dislocations. This led to an increase in high-angle grain boundaries (HAGBs) and an enhanced degree of recrystallization in the welds. The average grain size in both the Al and Mg alloys of the WNZ followed a pattern of initially increasing and then decreasing along the thickness direction, reaching a maximum in the upper-middle part and a minimum at the bottom. The influence of UV on the average grain size in the WNZ was minimal, with only slight grain refinement observed, and the minimum refinement degree was only 0.9%. The Schmid factor (SF) on the WNZ and thermo-mechanically affected zone (TMAZ) boundary regions of the advancing side (AS) indicates that the application of UV increased the likelihood of basal slip and extension twinning in the crystal structure. In addition, UV reduced the thickness of IMCs and improved the strength of the Al-Mg bonding interface. These results suggest a higher probability of fracture along the TMAZ and WNZ boundary on the AS when UV was applied. Full article

(This article belongs to the Special Issue Advances in Materials Joining and Additive Manufacturing (2nd Edition))

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20 pages, 8930 KiB

Open AccessArticle

Influence of Post-Heat Treatment on Corrosion Behaviour of Additively Manufactured CuSn10 by Laser Powder Bed Fusion

by Robert Kremer, Johannes Etzkorn, Somayeh Khani, Tamara Appel, Johannes Buhl and Heinz Palkowski

Materials 2024, 17(14), 3525; https://doi.org/10.3390/ma17143525 - 16 Jul 2024

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Abstract

This study investigates the influence of heat treatments on the corrosion behaviour of CuSn10 tin bronze, additively manufactured using Laser Powder Bed Fusion (LPBF). LPBF enables the creation of finely structured, anisotropic microstructures, whose corrosion behaviour is not yet well understood. After production, specimens were heat-treated at 320 °C, 650 °C, and in a two-stage treatment at 800 °C and 400 °C, followed by hardness and microstructure analysis. Corrosion tests were conducted using linear polarisation, salt spray, and immersion tests. The results show that heat treatments at 320 °C and 650 °C have no significant effect on the corrosion rate, while the two-stage treatment shows a slight improvement in corrosion resistance. Differences in microstructure and hardness were observed, with higher treatment temperatures leading to grain growth and tin precipitates. The formation of a passive protective layer was detected after 30 h of OCP measurement. Results from other studies on corrosion behaviour were partially reproducible. Differences could be attributed to varying chemical compositions and manufacturing parameters. These findings contribute to the understanding of the effects of heat treatments on the corrosion resistance of additively manufactured tin bronze and provide important insights for future applications in corrosive environments. Full article

(This article belongs to the Special Issue Advances in Materials Joining and Additive Manufacturing (2nd Edition))

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15 pages, 1712 KiB

Open AccessArticle

Composition Profiles at the Metal Substrate–Deposit Interface Produced in Laser-Assisted Additive Manufacturing Processes

by László Péter, Szilvia Kugler, Tamás Kolonits and Attila Nagy

Materials 2024, 17(13), 3125; https://doi.org/10.3390/ma17133125 - 26 Jun 2024

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Abstract

The cross-section of various substrate–deposit metal pairs obtained with a laser-assisted additive manufacturing process has been studied by observing the composition profile with energy-dispersive spectroscopy (EDS). The EDS composition profiles observed with a sufficiently high data acquisition time revealed that the composition profile is asymmetric. By scanning toward the growth direction, a sudden composition variation was observed, which was followed by a slow decay. The character of the composition profile was the same for a number of substrate–deposit pairs, and similar trends were found in various earlier publications as well. A mathematical model for the composition variation is suggested based on the assumption that a spontaneous homogenization process takes place in the intermixing (dilution) zone of the remelted top layer of the substrate. The equation obtained makes it possible to quantitatively describe the composition profile of each component that exhibits a concentration difference between the substrate and the deposit, provided that the mole fraction difference much exceeds the scattering of the data measured. The suggested model has also been applied successfully to composition profiles published in other works, hence exhibiting general relevance. Since the variation in some physical parameters (such as hardness) along the growth direction has been reported to follow the same pattern, it is assumed that the root cause in these cases may also be the composition variation. Full article

(This article belongs to the Special Issue Advances in Materials Joining and Additive Manufacturing (2nd Edition))

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