An investigation into the effect of process parameters on melt pool geometry, cell spacing, and grain refinement during laser powder bed fusion
| Autor: | Norman Y. Zhou, Ali Keshavarzkermani, Ehsan Toyserkani, Ali Bonakdar, Yahya Mahmoodkhani, Usman Ali, Ehsan Marzbanrad, Pablo D. Enrique, Reza Esmaeilizadeh |
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| Rok vydání: | 2019 |
| Předmět: |
0209 industrial biotechnology
Fusion Materials science Geometry 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure Laser Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention 020901 industrial engineering & automation law Scientific method Powder bed Energy density Laser power scaling Electrical and Electronic Engineering 0210 nano-technology Melt pool |
| Zdroj: | Optics & Laser Technology. 116:83-91 |
| ISSN: | 0030-3992 |
| Popis: | An applied energy density approach defined as the ratio of laser power and scanning velocity is often used as a guideline for selecting appropriate process parameters in laser powder bed fusion (LPBF). In this study, amongst the many variables related to input energy, we investigate the effectiveness of laser energy density (LED) on the melt pool geometry and microstructure of Hastelloy X single tracks produced by fixed LED values at different laser powers and scanning velocities. The results reveal that for a fixed LED, the higher laser power has a higher effect on the melt pool depth. In addition, compared to the scanning velocity, laser power has a higher influence on the melt pool geometry. Moreover, it is proposed that the finer cell structure observed in the melt pool of high laser power is due to the higher cooling rates. Finally, the higher number of new grains observed in melt pools created with higher laser power and fixed LED are likely due to the grain detachment caused by the increase in the partially melted particles. |
| Databáze: | OpenAIRE |
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