Additive manufacturing (AM), or 3D printing, is an emerging technology that "adds" materials up and constructs products through a layer-by-layer procedure. Laser powder bed fusion (LPBF) is a powder-bed-based AM technology that can fab-ricate a large variety of metallic materials with excellent quality and accuracy. However, various defects such as porosity, cracks, and incursions can be generated during the printing process. As the most universal and a near-inevitable defect, porosity plays a substantial role in determining the mechanical performance of as-printed products. This work presents a comprehensive review of literatures that focused on the porosity in LPBF printed metals. The formation mechanisms, evaluation methods, effects on mechanical performance with corresponding models, and controlling methods of porosity have been illustrated and discussed in-depth. Achievements in four representative metals, namely Ti?6Al?4V, 316L, In-conel 718, and AlSi10Mg, have been critically reviewed with a statistical analysis on the correlation between porosity fraction and tensile properties. Ductility has been determined as the most sensitive property to porosity among several key tensile properties. This review also provides potential directions and opportunities to address the current porosity-re-lated challenges.

Dawei Wang;Huili Han;Bo Sa;Kelin Li;Jujie Yan;Jiazhen Zhang;Jianguang Liu;Zhengdi He;Ning Wang;Ming Yan

Department of Materials Science and Engineering,and Shenzhen Key Laboratory for Additive Manufacturing of High Performance Materials,Southern University of Science and Technology,Shenzhen 518055,China;Jiaxing Research Institute,Southern University of Science and Technology,Jiaxing 314031,China;Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen 518055,China;COMAC Beijing Aircraft Technology Research Institute,Beijing 102211,China;Shenzhen Technology University,Shenzhen 518118,China

光电进展（英文版）

[1]Dawei Wang;Huili Han;Bo Sa;Kelin Li;Jujie Yan;Jiazhen Zhang;Jianguang Liu;Zhengdi He;Ning Wang;Ming Yan-.A review and a statistical analysis of porosity in metals additively manufactured by laser powder bed fusion)[J].光电进展（英文版）,2022(10):35-68

incursions,conel

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