https://orcid.org/0000-0002-9743-3157
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ABSTRACT
Tungsten carbide (WC) in Ni-based powders is a promising candidate for laser-based additive manufacturing because WC is an extremely hard material, whereas Ni is tough and weldable. However, WC particles that are directly exposed to a laser beam can be degraded or disintegrated into tungsten and carbon as a result of excess energy. In contrast, particles in the melt pool are relatively stable. In this study, the direct energy deposition method was used with irregular and spherical WC particles in metal powder. Irregular WC particles were found to be more directly affected by laser irradiation. To explain the effects of WC particle shapes on direct laser damage, a finitepoint calculation was performed to estimate the sinking time in the melt pool. The rectangular shape particles a longer sinking time depending on the rotation angle, whereas the spherical particles sank uniformly based on the difference in the effective area of resistance.
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Woo-Jin Lee
Woo-Jin Lee received the bachelor's degree in materials science & engineering from Pukyong National University, Busan, Korea, in 2018. She is currently a Master degree candidate at Pusan National Univertiy and is working as a master's research student at the Korea Institute of Materials Science, 3D Printing Materials Lab in 2021. Her current research interests are metal 3D printing processes and metal composite materials producted by a laser additive manufacturing process.
Eun-Ah Kim
Eun-Ah Kim received the Master's degree in Materials Science & Engineering from Chungnam national University, Daejeon, Korea, in 2019. She is currently a PhD student at Pusan national university.Her current research interests are metal 3d printing processes using machine learning and x-ray tomography.
Yeong-Jin Woo
Yeong-Jin Woo received the bachelor's degree in biotechnology from Kosin University, Busan, Korea, in 2017. He is currently enrolled in the master's program in material engineering at Pusan National University, and is working as a master's research student at the Korea Institute of Materials Science, 3D Printing Materials Lab, Changwon, Korea, in 2021. His research interests are in the field of additive manufacturing design method and parts manufacturing using metal and plastic 3D printing.
Ihho Park
Ihho Park received his PhD in Materials Engineering from University of Tokyo, Tokyo, Japan in 2013. From 2013 to 2014, he had worked for Samsung Corning Precision Materials as a researcher involved to microstructure characterization of new materials. And then he joined in SK Innovation as a researcher studying metallurgy and failure analysis of structure materials from 2014 to 2019. Since 2019, he has been working as a researcher in Korea Institute of Materials Science. His current research areas are micrustructre charaterization based on TEM analysis and failure analysis based on metallurgy.
Ji-Hun Yu
Ji-Hun Yu received the Ph.D. in Metallurgy and Materials Science of Hanyang University, Korea, in 2001. And then he has studied on the bio application of nano powders at Swiss Federal Institute of Technology in Lausane, Switzerland, as a Post doctoral position. Since 2003, he has been working as a principal researcher at the Powder Materials Research Division, Korea Institute of Materials Science, Changwon, Korea. His current interests are the fabrication and the application of various metal additive manufacturing process.
Taeho Ha
Taeho Ha received the PhD in mechanical engineering from Osaka University, Japan in 2003. From 2003 to 2005, he served as a JSPS researcher and assistant professor of mechanical engineering at Osaka University, Japan. He has joined Korea Institute of Machinery & Materials (KIMM), Daejeon, Korea since 2005 and is currently working as a 3D printing team leader. His current research interests are in the development of additive manufacturing systems and processes.
Yoon Suk Choi
Yoon Suk Choi Professor Choi received Ph.D. in Materials Science & Engineering from Carnegie Mellon University, Pittsburgh, PA, USA in 2001 after his M.S. and B.S. degrees in Metallurgical Engineering at Pusan National University (PNU), Korea. He spent about a year as a postdoctoral researcher at the Department of Civil & Environmental Engineering, Carnegie Mellon University. In 2002, he joined UES, Inc., Dayton, OH, USA, as a staff scientist and spent about 11 years in initiating and performing various research projects in the field of Computational Materials Science & Engineering. He joined PNU in 2013 with an associate professorship. In 2018, he was tenured with a full professorship and served as an Associate Dean in College of Engineering, PNU. His research interests involve advanced high temperature metallic materials for power and energy applications, microstructure-defect-property modeling in metal additive manufacturing, and materials data analytics. He currently serves as an editor for Metals & Materials International, and a key reader for Metallurgical & Materials Transactions A.
Hak-Sung Lee
Hak-Sung Lee received the PhD in computational materials science from the University of Tokyo, Tokyo, Japan, in 2010. From 2011 to 2012, he was with Imperial College London, London, United Kingdom, where he was involved in modeling of materials interfaces and atomic simulations. Since the end of 2012, he has been working as a senior researcher of Korea Institute of Materials Science (KIMS), Changwon, Korea, where he worked on design for additive manufacturing and smart factory. His current research interests are in the areas of metal 3D printing with machine learning.