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VIDEOS

"Merged movie" showing both high-speed video of metal powder spreading using the powder spreading testbed (PST) at NIST, as well as a plot showing particle tracks describing how the powder moved during spreading.

This video shows the spreading of relatively coarse reused stainless steel (17-4 PH) powder feedstock (D50=38.4 µm) for laser powder bed fusion (LPBF) using the powder spreading testbed at 60 mm/s recoater velocity. Additionally, the recoater blade is ceramic, the layer height has been set to 40 µm and this spread is conducted over previously spread powder (multi-layer spreading) as it occurs in LPBF equipment. The particle-tracking velocity vectors are colorized and plotted on a fixed reference frame that follows the recoater blade. The high-speed grayscale video of the spreading powder is superimposed onto the vector field. Note that the X and Y axes are plotted at different magnifications. The field of view is 9.49 mm by 2.44 mm. The frame rate of the video is 16000 frames per second (fps). Each frame is timestamped. The playback speed is 30 fps, so it plays 533 times slower than the actual spreading.

Uploaded On

December 5, 2023

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