研究目的
To introduce a method for gaining insight into the particle behavior within L-PBF based on 3D PTV, presenting an experimental setup that allows spatial and temporal highly resolved process observation via a calibrated setup of two ultrahigh-speed cameras under realistic process conditions.
研究成果
The system delivers good results within the specified measurement task, allowing a detailed view into the process behavior with a statistically sufficient sample size. Future work will focus on the particle and spatter behavior within different process situations and materials.
研究不足
The system is prone to measurement errors for velocities and particle numbers exceeding those present in L-PBF. An increased number of measurement points can avoid the former, and an improved illumination setup can resolve the latter.
1：Experimental Design and Method Selection:
The system is comprised of two ultrahigh-speed cameras and a reconstruction task specific processing reconstruction algorithm. It enables an automated determination of 3D measures from the trajectories of a large number of tracked particles.
2：Sample Selection and Data Sources:
316L stainless steel (
3：4404) was used as the powder and base material. The powder particle size was between 20 and 53 μm. List of Experimental Equipment and Materials:
Two Phantom v1210 ultrahigh-speed cameras, a Trumpf TruDisk 6001 Yb:YAG laser, and a Cavilux HF illumination system were used.
4：Experimental Procedures and Operational Workflow:
The process was observed at a frame rate of 60 kfps with an effective frame rate of 30 kfps due to alternating illumination.
5：Data Analysis Methods:
The algorithm includes particle detection, matching of particles, 3D coordinate determination, and tracking of particles incorporating a priori knowledge of the process.
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