About this Abstract |
Meeting |
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
|
Symposium
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2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
|
Presentation Title |
Time-resolved Optical Spectroscopy in Metal Powder Bed Fusion |
Author(s) |
Matthias Beuting, Luis I. Escano, Alex J. Fairhall, Randall H. Goldsmith, Lianyi Chen, Scott T. Sanders |
On-Site Speaker (Planned) |
Matthias Beuting |
Abstract Scope |
Our work addresses the challenge of understanding the dynamics of the interaction between partially evaporated metal and the melt pool in powder bed fusion. So far, few contactless sensing strategies have been developed for measuring metal vapor temperature, density, and composition - information crucial for modeling the influence of plume recoil pressure on the microstructure of the part being built. We used optical emission spectroscopy (OES) and tuned diode-laser absorption spectroscopy (TDLAS) to study the vapor plume during the processing of Ti-6Al-4V. The use of novel blue diode lasers allowed for time-resolved measurement of the temperature of gaseous vanadium using TDLAS in selective laser melting (SLM) and electron beam melting (EBM). The fast repetition rate of 20 kHz provided further insights into the transient plume conditions in EBM, revealing a roughly symmetrical shape with uniform temperature. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |