Regensburg 2025 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 9: Poster

MM 9.59: Poster

Monday, March 17, 2025, 18:30–20:30, P1

Nanoscale characterization of AM316L stainless steel for hydrogen application — •Gabriele Palazzo, •Felix Stierle, Kai Stefan Lagemann, Christian Kübel, Stefan Wagner, and Astrid Pundt — Karlsruhe Institute of Technology, Karlsruhe, Germany

Additive manufactured (AM) austenitic stainless steel 316L prepared by selective laser melting (SLM) is characterized by advanced nanoscale characterization techniques to examine its microstructural features. High-resolution scanning TEM (HR-STEM), selected area diffraction (SAD), and analytical methods such as energy-dispersive X-ray spectroscopy (EDX) as well as electron energy loss spectroscopy (EELS) are employed. Typical SLM printing structures (equiaxial and columnar cellular structure, nano-inclusions) are observed with atomic resolution both for as-built and tensile tested samples. The presence of silicon-manganese oxide nano-inclusions, preferential chromium and molybdenum segregation around them is revealed, as well as iron depletion and chromium enrichment along the cell boundaries. This peculiar multi-scale AM microstructure accounts for the unique mechanical properties of AM316L in terms of resistance and ductile behaviour, if compared to the conventionally manufactured counterpart, allowing to overcome the trade-off between strength and ductility.

Keywords: Austenitic stainless steel; Selective laser melting; TEM; SEM; Hydrogen embrittlement