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| Review on Smoking Mechanism and Factor Analysis During Selective Electron Beam Melting Process |
| SHI Yilei1, 2, WANG Zhuang1, SANG Xinghua1, YANG Bo1, XU Haiying1, 3, YANG Guang4, GONG Shuili1, 4, QI Bojin2 |
1. Science and Technology on Power Beam Generator Laboratory, AVIC Manufacturing Technology Institute, Beijing 100024, China;
2. Beihang University, Beijing 100191, China;
3. Nanjing University of Science and Technology, Nanjing 210094, China;
4. Science and Technology on Power Beam Processes Laboratory, AVIC Manufacturing Technology Institute, Beijing 100024, China |
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Abstract During selective electron beam melting (SEBM) process, powder particles are negatively charged by the electron beam causing coulombic interactions, which is easy to cause the powder scattering and smoking phenomenon. This phenomena can lead to problems such as electron gun discharge, unstable beam current, uneven powder spreading, etc., which in turn will cause process instability and stop processing. In order to expand the application scope of SEBM process, based on the interaction characteristics between the electron beam and the powder, the mechanism and factors for the formation of powder smoking were analysed and summarised in terms of powder characteristics and process parameters. Based on the ways to reduce the electrostatic force between powders, from which measures to prevent powder smoking were summarised, further directions for basic research on powder smoking in SEBM were described. This is to provide a reference for the long-term work stability, reliability improvement and quality enhancement of SEBM.
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2023, 
