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Meeting 2019 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2019)
Symposium 2019 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2019)
Presentation Title Melting mode thresholds in laser powder bed fusion and their application towards process parameter development
Author(s) Sagar Devraj Patel, Mihaela Vlasea
On-Site Speaker (Planned) Sagar Devraj Patel
Abstract Scope Depending on processing conditions, laser powder bed fusion (LPBF) has broadly two different operational regimes, conduction and keyhole mode. Heat conduction governs the melt pool morphology observed in conduction mode melting. In contrast, keyhole mode melting is observed when the morphology of the molten pool is controlled by thermo-capillary convection and recoil momentum pressure generated by vaporization of a given material. In this work, we describe another melting mode called transition mode wherein the dominance of conduction or convection depends on processing conditions. Additionally, we propose processing diagrams to visualize the three melting modes - conduction, transition, and keyhole mode, along with a temperature prediction model to predict melting mode thresholds in both continuous and modulated beam LPBF systems. The normalized processing diagrams obtained from this work are used for understanding the physical origins of defects in three-dimensional Ti-6Al-4V continuous LPBF parts and AlSi10Mg modulated LPBF parts.
Proceedings Inclusion? Definite: Post-meeting proceedings


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