Additive Manufacturing: From Fundamentals to Materials Performance and Applications

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Metals and Alloys".

Deadline for manuscript submissions: 20 February 2025 | Viewed by 634

Special Issue Editors


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Guest Editor
Advanced Remanufacturing and Technology Centre (ARTC), Agency for Science Technology and Research (A*STAR), Singapore 797523, Singapore
Interests: advanced manufacturing; structural and high-performance alloys; metal matrix (nano) composite microstructure; fracture and fatigue; corrosion

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Guest Editor
Scientist SG, Materials & Mechanical Entity, Vikram Sarabhai Space Centre, Trivandrum 400076, India
Interests: materials processing; titanium alloys; superalloys; metal additive manufacturing
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Special Issue Information

Dear Colleagues, 

Additive manufacturing (AM) is revolutionizing the manufacturing sector, especially for the production of metallic components with added functionality—including complex or intricate geometries and conformal cooling channels—as well as for the production of highly customized parts with small production cycles. These processes include heat treatment; thermomechanical treatment; severe plastic deformation processes; casting and welding; and additive manufacturing, which can play a significant role in the creation of the desired properties of traditional metallic materials.

In this Special Issue, we aim to unite leading experts and scholars to contribute their insights, research findings, and innovations, thereby unraveling the multifaceted realm of additive manufacturing (AM) through exploring developments in the field and the design of alloys specific to the process. From its foundational principles to the forefront of applications and advancements in materials performance, we aim to foster a comprehensive understanding of this rapidly evolving field. We welcome contributions from various disciplines, including materials science, metallurgy, mechanical engineering, computational modeling, and related fields.

Dr. Sankaranarayanan Seetharaman
Dr. V. Anil Kumar
Guest Editors

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Keywords

  • additive manufacturing
  • powder bed fusion
  • directed energy deposition
  • selective laser melting
  • electron beam melting
  • wire arc additive manufacturing
  • metal binder jetting
  • heat treatment
  • material characterization
  • feedstock modification
  • qualification
  • simulations
  • microstructure
  • mechanical properties
  • alloy systems and alloy development
  • next-generation 4D printing
  • innovation in processing strategies
  • innovation and advancement in powder production
  • microstructure and property correlation
  • numerical simulation
  • defect and failure analysis
  • industrialization of the process

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Published Papers (1 paper)

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Research

16 pages, 6592 KiB  
Article
Effect of DC Micro-Pulsing on Microstructure and Mechanical Properties of TIG Welded Ti-6Al-4V
by Jose Vypana, Nagumothu Kishore Babu, Mahesh Kumar Talari, Karni Vamsi Krishna, Chakravarthula Gopi Krishna and Ateekh Ur Rehman
Crystals 2024, 14(11), 919; https://doi.org/10.3390/cryst14110919 - 25 Oct 2024
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Abstract
This paper deals with the influence of micro-pulsed direct current on microstructure and mechanical properties of gas tungsten arc welding (GTAW) weldments of Ti-6Al-4V (Ti-64). Bead-on-plate GTA welds were made on the samples in the un-pulsed and micro-pulsed (125 Hz and 250 Hz) [...] Read more.
This paper deals with the influence of micro-pulsed direct current on microstructure and mechanical properties of gas tungsten arc welding (GTAW) weldments of Ti-6Al-4V (Ti-64). Bead-on-plate GTA welds were made on the samples in the un-pulsed and micro-pulsed (125 Hz and 250 Hz) conditions. Post-weld heat treatment (PWHT) was performed on a few coupons at 700 °C for 3 h in an inert atmosphere, followed by furnace cooling. In the microstructure, the fusion zone (FZ), base metal (BM), and heat-affected zone (HAZ) can be easily distinguished. The top surface of the FZ has large columnar grains because of lower heat loss to the surrounding atmosphere, and the bottom region of the FZ has comparatively smaller equiaxed grains. The micro-pulsed samples’ FZ grain size was lower than that of those made without pulsing. This shows that high-frequency current has substantially refined prior β grains. The microstructure of the FZ is characterized by an acicular morphology composed of α, martensitic α′, and retained β phases. The FZ’s hardness was higher than the BM due to the presence of martensitic α′. Additionally, the hardness in the HAZ was elevated due to the formation of finer martensitic α′. Micro-pulsed DC welding led to improved mechanical properties, including higher hardness, ultimate tensile strength (UTS), and ductility compared to un-pulsed welding. This enhancement is attributed to the grain refinement achieved with micro-pulsed DC. After PWHT, the prior β grain size remained relatively unchanged compared to the as-welded condition. However, the hardness in the FZ decreased due to the decomposition of α′ into α and β phases. The ductility of all samples improved as a result of the widening of the diffusional α phase. Full article
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