Regensburg 2019 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 12: Poster session I

MM 12.5: Poster

Montag, 1. April 2019, 19:15–20:45, Poster C

Real-time monitoring of laser powder bed fusion process using high-speed X-ray imaging — •Jan Rosigkeit¹, Dieter Lott¹, Marc-André Nielsen¹, Benjamin Wahlmann², Tao Sun³, Marcus Rackel¹, Peter Staron¹, Florian Pyczak¹, and Martin Müller¹ — ¹Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Germany — ²Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Germany — ³Advanced Photon Source, Argonne National Laboratory, USA

We employ the high-speed synchrotron hard X-ray imaging technique to monitor the laser powder bed fusion process of Ti-6Al-4V powder on a Ti-42Al-8.5Nb-0.2C base plate in situ and in real time. Many scientifically and technologically significant phenomena in laser powder bed fusion, including melt pool dynamics, powder ejection, rapid solidification and keyhole pore formation are experimentally revealed with high spatial and temporal resolutions. The data present here will facilitate the understanding of dynamics and kinetics in metal laser powder bed fusion process.

The laser beam carrying various powers entered into the chamber straight down on the powder bed. The laser was operated in a spot-heating mode and in a line scanning mode. The X-ray beam impinged on the samples horizontally providing a side view of the powder bed.

All image series were taken with a frame rate of 50 kHz and an exposure time of 1 µ s for each individual image. It can be observed that the process starts with the melting of theTi-6Al-4V powder around the laser spot and then the Ti-42Al-8.5Nb-0.2C base plate.