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Selective Laser Melting at High Laser Intensity: Overhang Surface Characterization and Optimization
Spierings, Adriaan B.
- Conference Paper
Rights / licenseIn Copyright - Non-Commercial Use Permitted
The build rates of the SLM process are nowadays increasing by implementing high-power laser sources, enabling higher scan speeds and thicker powder layers. This development implies the use of finer laser spot diameters; hence reaching laser intensities of 60 kWmm-2. Previous works have proven the ability to build dense material with very high laser intensities on different alloys. However, such developments basically aimed at comparably simple volume parts, e.g. in the tooling sector. This raises the needs to develop manufacturing strategies (scanning strategy, energy density) for complex-shaped, functional parts with respect to overhang surfaces. This study addresses SS316L material density- and surface roughness-effects on samples produced at relative low and high laser intensity. Effects of heat accumulation between two layers were identified as a key parameter affecting the down-face roughness, thus underlining the importance of the time between scanning of two successive layers. The results enable a gain in productivity induced by high-power build-up rates and will permit to establish generic guidelines for additive manufacturing at high power Show more
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Organisational unit03641 - Wegener, Konrad / Wegener, Konrad
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