Materials Reports  2021, Vol. 35 Issue (z2): 410-416 |
| METALS AND METAL MATRIX COMPOSITES |
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| Thermodynamic Behavior and Defects of Laser Selective Melting Ti6Al4V at Mesoscopic Scale: Numerical Simulation and Experimental Verification |
| ZHAO Jinmeng1,2,3, LU Lin1,2, WANG Jingrong3, ZHANG Liang1,2,WU Wenheng1,2, ZHU Dong1,2,3, GUO Shuaidong1,2,3, XIAO Congyue1,2
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1 Shanghai Engineer Research Center of 3D Printing Materials, Shanghai 200437, China
2 Shanghai Research Institute of Materials, Shanghai 200437, China
3 College of Engineering,Shaghai Polytechnic University,Shanghai 201209, China |
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Abstract Based on the three-dimensional Ti6Al4V powder bed model for selective laser melting at mesoscopic scale, the influence of selective laser melting parameters on the internal metallurgical defects of formed parts was studied. With the laser power is increased from 100 W to 350 W, the width of molten pool increases from 62.6 μm to 116.2 μm,the depth increases from 24.9 μm to 32.4 μm. When the laser energy is not enough to penetrate the powder layer, unmelted particles and spheroidization exist in the molten pool. When the laser power is too high, the metal powder will evaporate under sufficient energy, resulting in recoil pressure, which improves splashing ability of the melt and decreases the surface quality of molten pool. According to the simulation process, the forming parts were prepared and tested, the experimental results of porosity and molten pool width are consistent with the simulation results, which indicates that the discontinuous interface model of powder bed based on mesoscopic scale could be used to guide the selection of process parameters and control metallurgical defects in selective laser melting.
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Published: 09 December 2021
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| Fund:This work was financially supported by the Shanghai Sailing Program (17YF1405400), Shanghai Rising-star Program (18QB1400600). |
About author:: Jinmeng Zhao received a master's degree in Engineering from the Shanghai Polytechnic University in 2021, he mainly engaged in additive manufacturing development in Shanghai Research Institute of Materials and Shanghai engineering Research Center of 3D printing materials. His main research direction is mesoscopic numerical simulation and experimental research of titanium alloy additive manufacturing. In addition, he participated in 2 research projects and published two articles in Materials Review and other journals.
Lin Lu received his Ph.D. degree from the University of Science and Technology Beijing (USTB) in 2016, now is the chief engineer of Shanghai engineering Research Center of 3D printing materials. He Mainly engaged in high-performance metal powder preparation, spray forming rapid solidification technology, metal 3D printing technology and other research directions. He participated in 8 research projects including the National Basic Research Program of China (973 Plan), industrial foundation project of Ministry of industry and information technology of the people's Republic of China, Shanghai Natural Science Foundation, and presided over 1 project of Shanghai Science and technology talent plan. 17 papers have been published in materials characterization, Journal of materials research, Journal of metals and other journals, including 7 SCI papers, 13 EI papers and 4 invention patents. |
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