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Cross-Scale Understating of Physical Mechanisms for Structure and Performance Control of Metal Laser Additive Manufacturing

Keynote Speaker (by invitation only) at Digital Twin Symposium 2019, presented by Dongdong Gu

Abstract

Due to the point-by-point, line-by-line and area-by-area localized forming characteristics of laser additive manufacturing (LAM) process, it is necessary to carry out the microscopic - mesoscopic - macroscopic cross-scale structure and performance control of LAM of metal components, in order to realize the effective control of typical metallurgical defects such as balling effect, porosity, deformation, and cracks. In this presentation, the selective laser melting (SLM) additive manufacturing of aluminium-based and nickel-based components was performed. In the mesoscopic scale, the thermodynamic behavior of the laser melting / solidification of the metal powder was disclosed and the formation and inhibition mechanisms of balling effect were revealed. In the microscopic scale, the evolution of surface tension of the melt in the molten pool and the mechanism of bubble motion and melt densification were clarified. In the macroscopic scale, the thermal mechanism, stress formation and performance control of LAM processed components were proposed. This presentation provides the physical basis and key process control methods for the structure and performance control of high-performance metal components by LAM.

Presenting Author

Photo ofDongdong Gu

Dongdong Gu

Nanjing University of Aeronautics and Astronautics

Prof. Dr. Dongdong Gu is currently a Full Professor of Nanjing University of Aeronautics and Astronautics (NUAA), the Vice-Director of College of Materials Science and Technology of NUAA, and the Director of Jiangsu Provincial Engineering Laboratory for Laser Additive Manufacturing of High-Performance Metallic Components. He was an Alexander von Humboldt Research Fellow in the Fraunhofer Institute for Laser Technology ILT, Aachen, Germany from 2009 to 2011. Prof. Gu is presently the Senior Editor of J Laser Appl and the Editorial Board Members of Int J Mach Tool Manuf, Appl Surf Sci, Additive Manuf, Int J Precis Eng Manuf, Laser Eng, & Heliyon. He is the Standing Committee Member of Additive Manufacturing Technology Institution, Chinese Mechanical Engineering Society and the Standing Committee Member of Laser Processing Committee of Chinese Optical Society (COS). His principal research interest is laser-based additive manufacturing of high-performance/multi-function metallic components. His obtained the financial support from more than 30 projects including National Natural Science Foundation of China (NSFC), the National Key Research and Development Program, the NSFC-DFG Sino-German Research Project, etc. Prof. Gu has authored/co-authored 3 books and more than 140 papers in a number of international peer reviewed journals. He has been involved in 28 international conferences as Co-Chairman, Academic Committee Member and Keynote/Invited Speaker. Prof. Gu has been awarded Fraunhofer-Bessel Research Award from the Alexander von Humboldt Foundation Germany (2018), Mercator Fellow Grant from the German Research Foundation (DFG) (2018), Science and Technology Innovative Talents of China, Ministry of Science and Technology of China (2017), Cheung Kong Young Scholars Award, Ministry of Education of China (2016), Top-Notch Young Talents Program of China (2015), Excellent Young Scientists Fund from NSFC (2013), and “Green Talents” from the German Federal Ministry of Education and Research (BMBF) (2012).