Determining process stability of Laser Powder Bed Fusion using pyrometry

This study investigates the significance of melt pool temperature data obtained through pyrometry in a metal Laser Powder Bed Fusion (L-PBF, SLM) process. In an open-loop process like SLM, process monitoring is key in both determining the process quality and preparing towards closed-loop process con...

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Bibliographic Details
Published in:Procedia CIRP 2020, Vol.95, p.127-132
Main Authors: Gutknecht, Kai, Haferkamp, Lukas, Cloots, Michael, Wegener, Konrad
Format: Article
Language:English
Subjects:
Additive Manufacturing
Laser Powder Bed Fusion
LPBF
Melt pool dynamics
Melt pool monitoring
Pyrometry
Selective Laser Melting
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Summary:This study investigates the significance of melt pool temperature data obtained through pyrometry in a metal Laser Powder Bed Fusion (L-PBF, SLM) process. In an open-loop process like SLM, process monitoring is key in both determining the process quality and preparing towards closed-loop process control. A two-color pyrometer is integrated into the laser beam path of an SLM machine, such that it collects emitted radiation from the melt pool and its vicinity. By this, and with proper calibration, the maximum melt pool surface temperature can be obtained in-situ and as an absolute value. Cuboidal specimens from 1.4404/316L have been manufactured with different processing conditions to provoke different process behavior. During the build, the pyrometer data was recorded. The study shows, that on-axis pyrometry is an appropriate instrument for melt pool and process monitoring in particular, it discusses potential sources of disturbance and highlights potential application in in-situ process monitoring.
ISSN:2212-8271
2212-8271
DOI:10.1016/j.procir.2020.01.147