Complex metallic structures additively manufactured via laser powder bed fusion (L-PBF) is an already established technique in this rapidly growing industry branch. However, the development of alloys for field-specific applications and the quality and functionality of the final parts strongly depends on the micro- and nanostructure morphology, crystallography and chemical composition.
Within this paper correlative microscopy studies performed on 3D-printed parts of Fe- and Ti- alloys are presented [1-4]. Scanning and transmission electron microscopy (SEM and S/TEM) coupled with analytical characterization methods were used for advanced microstructural analysis of the as-built and heat-treated parts. Evolution of the microstructure during the ex-situ heat-treatment was first studied in detail in order to better comprehend the mechanical properties of the printed parts.
Furthermore, in-situ heating measurements at high spatial resolution provided information regarding the evolution of nanometric amorphous/crystalline phases and coarsening/shrinking of grains, diffusion of alloying elements and nucleation and evolution of secondary phases at different temperatures .
This work received financial support by the Austrian Science Fund (FFG): SP2018-003-006 (Microstructure of 3D printed metallic parts) and from the European Union’s Horizon 2020 research and innovation program under grant agreement No 823717 – ESTEEM3.
 Turk, C.; Zunko, H.; Aumayr, C.; Leitner, H.; Kapp, M.: Advances in Maraging Steels for Additive Manufacturing, Berg Huettenmaenn Monatsh., 164 (2019), no. 3, pp 112–116, https://doi.org/10.1007/s00501-019-0835-z
 Albu, M; Mitsche, S.; Nachtnebel, M.; Krisper, R.; Dienstleder, M.; Schröttner, H; Kothleitner, G.: Microstructure Investigations of Powders and Additive Manufactured Parts, Berg Huettenmaenn Monatsh., 165 (2020), no. 3, pp 169–174, https://doi.org/10.1007/s00501-020-00958-3
 Vilardell, A.M.; Yadroitsev, I.; Yadroitsava, I.; Albu, M.; Takata, N.; Kobashi, M.; Krakhmalev, P.; Kouprianoff, D.; Kothleitner, G.; du Plessis, A.: Manufacturing and characterization of in-situ alloyed Ti6Al4V(ELI)-3 at.% Cu by laser powder bed fusion, Add. Manuf. 36 (2020), 101436, https://doi.org/10.1016/j.addma.2020.101436
 Vilardell, A.M.; Takezawa, A.; du Plessis, A.; Takata, N.; Krakhmalev, P.; Albu, M.; Kothleitner, G.; Yadroitsava, I.; Yadroitsev, I.: Mechanical behavior of in-situ alloyed Ti6Al4V(ELI)-3 at.% Cu lattice structures manufactured by laser powder bed fusion and designed for implant applications, J. Mech. Bev. Biomed. Mat. 113 (2021) 104130, https://doi.org/10.1016/j.jmbbm.2020.104130
 Albu, M; Krisper, R.; Lammer, J.; Kothleitner, G.; Fiocchi, J.; Bassani, P.: Microstructure evolution during in-situ heating of AlSi10Mg alloy powders and additive manufactured parts, Add. Manuf. 36 (2020), 101605, https://doi.org/10.1016/j.addma.2020.101605