Schlicht S, Drummer D (2024)
Publication Language: English
Publication Type: Journal article, Original article
Publication year: 2024
Book Volume: 124
Pages Range: 261-264
DOI: 10.1016/j.procir.2024.08.113
Open Access Link: https://doi.org/10.1016/j.procir.2024.08.113
Non-isothermal laser-based powder bed fusion of polymers (PBF-LB/P) allows for the support-free additive manufacturing of semi-crystalline polymers at room temperature. The present paper demonstrates the support-free manufacturing of polypropylene, enabled through discretized exposure strategies, constituting fundamentally different processing conditions compared to quasi-isothermal PBF-LB/P at elevated temperatures. By applying fractal, superposed exposure strategies, the stable processing across a large geometric range is demonstrated. Thermographic in situ investigations show a negative correlation of the number of layers and emerging peak temperatures, contrasting the thermal evolution in quasi-isothermal PBF-LB/P. Complementary, post-coating equilibrium temperatures display a negative correlation with the geometry-dependent surface-volume ratio, inducing the emergence of geometry-dependent morphological characteristics while implicitly adapting thermal boundary conditions for subsequent layers. The overheating of initial layers alongside geometry-dependent heat accumulation implies the dynamic adaption of the applied energy density in non-isothermal, support-free PBF-LB/P, compensating for layer- and geometry-induced locally insufficient heat dissipation.
APA:
Schlicht, S., & Drummer, D. (2024). Layer-dependent temperature evolution and cooling kinetics in non-isothermal Powder Bed Fusion of polypropylene. Procedia CIRP, 124, 261-264. https://doi.org/10.1016/j.procir.2024.08.113
MLA:
Schlicht, Samuel, and Dietmar Drummer. "Layer-dependent temperature evolution and cooling kinetics in non-isothermal Powder Bed Fusion of polypropylene." Procedia CIRP 124 (2024): 261-264.
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