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Figure 7
Influence of camera exposure time on imaging of the solid–liquid interface during the laser AM process. (a) 1 µs. (b) 5 µs. (c) 10 µs. (d) 20 µs. (e) The solid–liquid interface (red squares) and liquid–gas interface (blue circles). The laser was scanned from left to right in this and all experiments. The vapor hole (depression) is comparable in diameter with that of the laser beam at the top surface of the metal. The thickness of the liquid layer in front of the vapor depression is small, whereas the melt pool extends several hundred micrometres behind the depression. The sample thickness (along the X-ray beam direction) is 380 µm. The laser power was 260 W and the scanning speed was 500 mm s−1. The scale bars are 100 µm.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 25| Part 5| September 2018| Pages 1467-1477
https://doi.org/10.1107/S1600577518009554
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