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Influence of powder bed temperature on microstructure and post heat treatment of high speed steel AISI M50 processed by laser-powder bed fusion

: Kunz, J.; Herzog, S.; Kaletsch, A.; Broeckmann, C.; Saewe, J.; Gayer, C.; Schleifenbaum, J.H.

European Powder Metallurgy Association -EPMA-:
Euro PM2018 Proceedings : 14 – 18 October 2018, Bilbao, Spain
Shrewsbury: EPMA, 2018
ISBN: 978-1-899072-50-7
6 pp.
International Powder Metallurgy Congress and Exhibition (Euro PM) <2018, Bilbao>
Conference Paper
Fraunhofer ILT ()

Laser powder bed fusion is an additive manufacturing process that enables the production of complex structures without material removal. For industrial use, the mechanical properties of LPBF parts have to be at least equal to the conventionally produced parts. High carbon steels expose a tendency to create stress-induced cracks during the LPBF process. An increase in powder bed temperature often decreases the danger of crack formation during the process. In this study, the steel M50 processed by LPBF at two different powder bed temperatures is analyzed. The structures are compared by hardness, light microscopy and X-ray diffraction. Scanning electron microscopy and electron backscatter diffraction are used for a closer investigation of the microstructure and texture. The influence of the resulting LPBF structure on a possible post heat treatment is analyzed by a dilatometric determination of a time-temperature-transformation diagram and a comparison to the behavior of the conventionally produced material.