Mechanism of double exposure strategy for improving down-skin roughness and dimensional accuracy in support-free printing
Laser Powder Bed Fusion (LPBF) additive manufacturing of support-free structures faces key technical challenges regarding down-skin quality and forming accuracy. This study first analyzed the impact of laser input energy on these factors. Subsequently, we proposed a double exposure strategy for the...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-06-01
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| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127525004101 |
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| Summary: | Laser Powder Bed Fusion (LPBF) additive manufacturing of support-free structures faces key technical challenges regarding down-skin quality and forming accuracy. This study first analyzed the impact of laser input energy on these factors. Subsequently, we proposed a double exposure strategy for the down-skin in support-free forming. Comparative analysis showed that double exposure significantly improved down-skin quality and forming accuracy, with more uniform energy distribution yielding better results. Specifically, down-skin roughness improved by 14.92 % and dimensional accuracy by 30.91 % compared to the best single-exposure specimen. Additionally, simulation analysis revealed the spreading and solidification mechanism of the melt pool in the overhanging region, discussing the formation of down-skin roughness and dimensional errors. This study provides technical guidance for LPBF support-free forming of overhanging structures. |
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| ISSN: | 0264-1275 |