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Additive Manufacturing and Microstructure Characteristics of Metallic Material
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Additive Manufacturing and Microstructure Characteristics of Metallic Material

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Metals and Alloys".

Deadline for manuscript submissions: 20 May 2024 | Viewed by 1624

Special Issue Editors

Dr. Haiyang Fan

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Guest Editor
Yantai Research Institute, Harbin Engineering University, Yantai 264000, China
Interests: multi-material additive manufacturing; hybrid additive manufacturing; titanium alloys; aluminium alloys; nickel superalloys
Dr. Junsheng Wang

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Guest Editor
School of Materials Science & Engineering, and Advanced Research Institute for Multidisciplinary Science (ARIMS), Beijing Institute of Technology, Beijing 100081, China
Interests: aerospace materials; integrated computational materials engineering (ICME); aluminum; magnesium; alloy design; solidification; heat treatment; thermodynamics; kinetics; grain refinement; precipitation
Special Issues, Collections and Topics in MDPI journals
Dr. Qimin Shi

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Guest Editor
Yantai Research Institute, Harbin Engineering University, Yantai 264000, China
Interests: selective laser melting; multi-material additive manufacturing; metal matrix composites; fluid mechanics and heat/mass transport in additive manufacturing
Dr. Kaihao Zhang

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Guest Editor
Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong SAR, China
Interests: metal matrix composites; fluid mechanics and heat/mass transport in additive manufacturing
Dr. Wei Fan

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Guest Editor
School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore
Interests: multi-material additive manufacturing; microstructure control; hybrid manufacturing; powder-melt pool interaction

Special Issue Information

Dear Colleagues,

For a given metal fabricated by additive manufacturing (AM), there can be a variety of microstructural features that affect its mechanical and functional properties, including the size of grains, grain boundaries, microsegregation of alloying elements, phases within the metal, size of dendrites, formation of anisotropic and heterogeneous microstructure. During the AM process, the microstructure is formed in situ and would therefore depend largely on the process parameters and material used. The process parameters are dependent on the metal AM method used.

Therefore, this Special Issue aims to appeal to the latest research about the microstructure in metals and alloys fabricated by different AM technologies. Examinations of titanium, aluminium, iron, nickel, cobalt, copper, magnesium, zirconium and their alloys, as well as refractory metals, glass metals, noble metals and high-entropy alloys, are all welcomed. AM technologies focus primarily on powder bed fusion and direct metal deposition, while solid-state processes such as ultrasonic additive manufacturing and cold spray additive manufacturing are also on our radar. Beyond the materials and techniques summarized above, the microstructure characterization of metal AM parts after various post-treatments is also within this scope.

This Special Issue is open to theoretical, computational and experimental studies. We look forward to receiving your contributions to the topic of Additive Manufacturing and Microstructure Characteristics of Metallic Material with original research work, review articles, and short communications.

Dr. Haiyang Fan
Dr. Junsheng Wang
Dr. Qimin Shi
Dr. Kaihao Zhang
Dr. Wei Fan
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
  • metals and alloys
  • microstructure
  • heat treatments
  • mechanical properties

Published Papers (2 papers)

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Research

22 pages, 25261 KiB  
Article
Simulation Study on Temperature and Stress Fields in Mg-Gd-Y-Zn-Zr Alloy during CMT Additive Manufacturing Process
by Mingkun Zhao, Zhanyong Zhao, Wenbo Du, Peikang Bai and Zhiquan Huang
Materials 2024, 17(5), 1199; https://doi.org/10.3390/ma17051199 - 05 Mar 2024
Viewed by 641
Abstract
A new heat source combination, consisting of a uniform body heat source and a tilted double ellipsoidal heat source, has been developed for cold metal transfer (CMT) wire-arc additive manufacturing of Mg-Gd-Y-Zn-Zr alloy. Simulations were conducted to analyze the temperature field and stress [...] Read more.
A new heat source combination, consisting of a uniform body heat source and a tilted double ellipsoidal heat source, has been developed for cold metal transfer (CMT) wire-arc additive manufacturing of Mg-Gd-Y-Zn-Zr alloy. Simulations were conducted to analyze the temperature field and stress distribution during the process. The optimal combination of feeding speed and welding speed was found to be 8 m/min and 8 mm/s, respectively, resulting in the lowest thermal accumulation and residual stress. Z-axis residual stress was identified as the main component of residual stress. Electron Backscatter Diffraction (EBSD) testing showed weak texture strength, and Kernel Average Misorientation (KAM) analysis revealed that the 1st layer had the highest residual stress, while the 11th layer had higher residual stress than the 6th layer. Microhardness in the 1st, 11th, and 6th layers varies due to residual stress impacts on dislocation density. Higher residual stress increases dislocation density, raising microhardness in components. The experimental results were highly consistent with the simulated results. Full article
(This article belongs to the Special Issue Additive Manufacturing and Microstructure Characteristics of Metallic Material)
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20 pages, 12339 KiB  
Article
Influence of Various Heat Treatments on Microstructures and Mechanical Properties of GH4099 Superalloy Produced by Laser Powder Bed Fusion
by Jiahao Liu, Yonghui Wang, Wenqian Guo, Linshan Wang, Shaoming Zhang and Qiang Hu
Materials 2024, 17(5), 1084; https://doi.org/10.3390/ma17051084 - 27 Feb 2024
Viewed by 617
Abstract
The microstructures and mechanical properties of a γ′-strengthened nickel-based superalloy, GH4099, produced by laser powder bed fusion, at room temperature and 900 °C are investigated, followed by three various heat treatments. The as-built (AB) alloy consists of cellular/dendrite substructures within columnar grains aligning [...] Read more.
The microstructures and mechanical properties of a γ′-strengthened nickel-based superalloy, GH4099, produced by laser powder bed fusion, at room temperature and 900 °C are investigated, followed by three various heat treatments. The as-built (AB) alloy consists of cellular/dendrite substructures within columnar grains aligning in <100> crystal orientation. No γ′ phase is observed in the AB sample due to the relatively low content of Al +Ti. Following the standard solid solution treatment, the molten pool boundaries and cellular/dendrite substructures disappear, whilst the columnar grains remain. The transformation of columnar grains to equiaxed grains occurs through the primary solid solution treatment due to the recovery and recrystallization process. After aging at 850 °C for 480 min, the carbides in the three samples distributed at grain boundaries and within grains and the spherical γ′ phase whose size is about 43 nm ± 16 nm develop in the standard solid solution + aging and primary solid solution + aging samples (SA and PA samples) while the bimodal size of cubic (181 nm ± 85 nm) and spherical (43 nm ± 16 nm) γ′ precipitates is presented in the primary solid solution + secondary solid solution + aging sample (PSA samples). The uniaxial tensile tests are carried out at room temperature (RT) and 900 °C. The AB sample has the best RT ductility (~51% of elongation and ~67% of area reduction). Following the three heat treatments, the samples all acquire excellent RT tensile properties (>750 MPa of yield strengths and >32% of elongations). However, clear ductility dips and intergranular fracture modes occur during the 900 °C tensile tests, which could be related to carbide distribution and a change in the deformation mechanism. Full article
(This article belongs to the Special Issue Additive Manufacturing and Microstructure Characteristics of Metallic Material)
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