Metal additive manufacturing (AM) technologies are classified into two groups according to the consolidation mechanisms and densification degrees of the as-built parts. Densified parts are obtained via a single-step process such as powder bed fusion, directed energy deposition, and sheet lamination AM technologies. Conversely, green bodies are consolidated with the aid of binder phases in multi-step processes such as binder jetting and material extrusion AM. Green-body part shapes are sustained by binder phases, which are removed for the debinding process. Chemical and/or thermal debinding processes are usually devised to enhance debinding kinetics. The pathways to final densification of the green parts are sintering and/or molten metal infiltration. With respect to innovation types, the multistep metal AM process allows conventional powder metallurgy manufacturing to be innovated continuously. Eliminating cost/time-consuming molds, enlarged 3D design freedom, and wide material selectivity create opportunities for the industrial adoption of multi-step AM technologies. In addition, knowledge of powders and powder metallurgy fuel advances of multi-step AM technologies. In the present study, multi-step AM technologies are briefly introduced from the viewpoint of the entire manufacturing lifecycle.

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• Potential and challenges for Powder Bed Fusion – Laser Beam (PBF-LB) in industrial ceramic additive manufacturing
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  Open Ceramics.2024; 18: 100614.     CrossRef
• SiC-Si composite part fabrication via SiC powder binder jetting additive manufacturing and molten-Si infiltration
  Ji-Won Oh, Jinsu Park, Sahn Nahm, Hanshin Choi
  International Journal of Refractory Metals and Hard Materials.2021; 101: 105686.     CrossRef

A three-dimensional physical part can be fabricated from a three-dimensional digital model in a layer-wise manner via additive manufacturing (AM) technology, which is different from the conventional subtractive manufacturing technology. Numerous studies have been conducted to take advantage of the AM opportunities to penetrate bespoke custom product markets, functional engineering part markets, volatile low-volume markets, and spare part markets. Nevertheless, materials issues, machines issues, product issues, and qualification/certification issues still prevent the AM technology from being extensively adopted in industries. The present study briefly reviews the standard classification, technological structures, industrial applications, technological advances, and qualification/certification activities of the AM technology. The economics, productivity, quality, and reliability of the AM technology should be further improved to pass through the technology adoption lifecycle of innovation technology. The AM technology is continuously evolving through the introduction of PM materials, hybridization of AM and conventional manufacturing technologies, adoption of process diagnostics and control systems, and enhanced standardization of the whole lifecycle qualification and certification methodology.

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• Convolutional LSTM based melt-pool prediction from images of laser tool path strategy in laser powder bed fusion for additive manufacturing
  Joung Min Park, Minho Choi, Jumyung Um
  The International Journal of Advanced Manufacturing Technology.2024; 130(3-4): 1871.     CrossRef
• Color evaluation by thickness of interim restorative resin produced by digital light processing 3D printer
  Wol Kang, Won-Gi Kim
  Journal of Korean Acedemy of Dental Technology.2021; 43(3): 77.     CrossRef
• Optimization of Metal Powder Particle Size Distribution for Powder Bed Fusion Process via Simulation
  Hwaseon Lee, Dae-Kyeom Kim, Young Il Kim, Jieun Nam, Yong Son, Taek-Soo Kim, Bin Lee
  Journal of Korean Powder Metallurgy Institute.2020; 27(1): 44.     CrossRef
• Technology Trend of Additive Manufacturing Standardization
  Hanshin Choi, Jinsu Park
  Journal of Korean Powder Metallurgy Institute.2020; 27(5): 420.     CrossRef
• Multi-step Metals Additive Manufacturing Technologies
  Ji-Won Oh, Jinsu Park, Hanshin Choi
  Journal of Korean Powder Metallurgy Institute.2020; 27(3): 256.     CrossRef
• Anisotropy in Green Body Bending Strength due to Additive Direction in the Binder-Jetting Additive Manufacturing Process
  Ji-Won Oh, Sahn Nahm, Byoungmoon Kim, Hanshin Choi
  Korean Journal of Metals and Materials.2019; 57(4): 227.     CrossRef
• Effect of Porosity on Mechanical Anisotropy of 316L Austenitic Stainless Steel Additively Manufactured by Selective Laser Melting
  Jeong Min Park, Jin Myoung Jeon, Jung Gi Kim, Yujin Seong, Sun Hong Park, Hyoung Seop Kim
  Journal of Korean Powder Metallurgy Institute.2018; 25(6): 475.     CrossRef