INTRODUCTION History and fundamentals of AM AM techniques Metal powder?based AM Post-processing Powder properties and characterization methods Challenges and future trends of metal powder?based AM Summary METAL POWDER PREPARATION PROCESSES Atomization Mechanical mixing Reduction process Powder modification Summary LASER POWDER BED FUSION History Fundamentals Printing process Metallurgical defects Powder materials Equipment Typical materials used in LPBF Mechanical metamaterials for LPBF Summary ELECTRON BEAM MELTING History Fundamentals Preheating and melting processes Metallurgical defects Powder materials Equipment Microstructures and mechanical properties Summary LASER-BASED DIRECTED ENERGY DEPOSITION History Fundamentals Deposition process Metallurgical defects Powder materials Equipment Microstructure and mechanical properties Summary METAL BINDER JETTING History Fundamentals Printing process Raw materials Equipment Microstructure and mechanical properties Summary APPLICATIONS Aerospace Biomedical Automotive Molding and tooling Energy Jewelry Marine, oil, and gas Challenges and risks

introduces the fundamentals of powder preparation processes and metal powder?based AM techniques while emphasizing their significance in various industrial applications.

Kun Zhou is Associate Professor in the School of Mechanical and Aerospace Engineering at Nanyang Technological University (NTU), Singapore. After his PhD degree in engineering mechanics from NTU, he worked as a Postdoctoral Fellow in the Department of Mechanical Engineering at Northwestern University, USA. His research focuses on additive manufacturing of polymers, metals and their composites. He has published more than 220 Journal articles and 17 book chapters. Changjun Han is Research Fellow in the School of Mechanical & Aerospace Engineering at Nanyang Technological University, Singapore. He received his PhD degrees from Huazhong University of Science and Technology, China. He has been engaged in metal powder-based additive manufacturing for over five years