Dresden 2026 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 35: Additive Manufacturing / Transport in Materials III
MM 35.2: Talk
Thursday, March 12, 2026, 16:00–16:15, SCH/A216
Electron Microscopy Investigation of AM316L before and after Heat Treatment: Implications for Hydrogen Diffusion — •Gabriele Palazzo1,2,3, Kai Stefan Lagemann1, Svetlana Korneychuk1,2,3, Stefan Wagner1, Christian Kübel2,3, and Astrid Pundt1 — 1Institute for Applied Materials, Karlsruhe Institute of Technology, Karlsruhe, Germany — 2Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Germany — 3Karlsruhe Nano Micro Facility, Karlsruhe, Germany
As hydrogen technologies evolve, understanding local hydrogen-metal interactions in structural alloys becomes critical. High-pressure hydrogen storage requires materials resistant to hydrogen embrittlement (HE). Austenitic stainless steels are promising, and selective laser melting (SLM) enables attractive properties but can reduce resistance to hydrogen environmental embrittlement (HEE). We investigate additively manufactured 316L (AM316L) steel and its interaction with dissolved hydrogen, focusing on microstructure evolution under directed heat treatments. SEM and (S)TEM with STEM-EELS/EDX map elemental distributions, while EBSD and STEM-ACOM resolve grain structure and sub-grain dislocation cells (SDC). Comparing as-built and heat-treated states by ex-situ TEM and hydrogen diffusion measurements, we show that heat treatment alters the microstructure, reduces hydrogen diffusivity, and lowers HEE susceptibility [1]. [1] Kai Stefan Lagemann, Gabriele Palazzo, Tim Lucas Haag, Svetlana Korneychuk, Stefan Wagner, Christian Kübel, and Astrid Pundt. Manuscript submitted. 2026.
Keywords: Hydrogen embrittlement; Additive manufacturing; 316L austenitic stainless steel; Microstructure evolution; Hydrogen diffusion