Research on track overlapping during Selective Laser Melting of powders |
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| Authors: | Xubin Su Yongqiang Yang |
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| Affiliation: | 1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;2. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China;1. School of Mechanical and Chemical Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, Perth, WA 6009, Australia;2. School of Materials Science and Technology, China University of Geosciences (Beijing), No. 29 Xueyuan Road, Haidian District, Beijing 100083, China;3. School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, Perth, WA 6027, Australia;1. Université de Lyon, Ecole Nationale d’Ingénieurs de Saint-Etienne (ENISE), DIPI Laboratory, 58 rue Jean Parot, 42023 Saint-Etienne, France;2. Karlstad University, Department of Mechanical and Materials Engineering, SE-651 88 Karlstad, Sweden;3. Linköping University, Department of Management and Engineering, SE-581 83 Linköping, Sweden;1. Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, China;2. Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, China |
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| Abstract: | The Selective Laser Melting (SLM) process fabricates components from powders by adding material and its processing principle is based on track overlapping regime, which has been studied in this paper. The inter-layer stagger scanning strategy was employed to avoid nonuniform distribution of energy input. By theoretical deduction and experimental observation, three types of overlapping regime were revealed: intra-layer overlapping regime, inter-layer overlapping regime and mixed overlapping regime with coexistence of the first two types. The overlapping patterns and the corresponding microstructures were then discussed. Experimental result showed that specimens fabricated by inter-layer overlapping regime had high relative density when track space was not larger than 0.2 mm. A cooling insert with relative density of about 93% was also obtained at track space of 0.12 mm. |
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