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MM: Fachverband Metall- und Materialphysik

MM 16: Poster Ia

MM 16.8: Poster

Montag, 18. März 2024, 18:30–20:30, Poster E

Characterization and improvement of the hydrogen embrittlement properties of AM316L — •Kai Lagemann, Stefan Wagner, and Astrid Pundt — Karlsruher Institute for Technology (KIT), Institute for Applied Materials Materials Science and Engineering (IAM WK), Karlsruhe

In this project, powder bed-based laser melting (PBF-LBM) is used to investigate additively manufactured 316L steel, which is planned to be used as a structural material in hydrogen technology in the future. It is investigated how the microstructure changes through the application of a remelting (RM) strategy and whether printing defects can be minimised as a result.

The RM parameter study identifies optimal manufacturing parameters. It is shown that the RM strategy melts remanent powder particles and reduces the melt pool distance. However, the microstructure of the steel can only be influenced to a limited extent.

The fracture behaviour of the printed steel shows a complex interplay of porosity, crystallographic grain orientation and hydrogen concentration. The combination of these effects influences the active failure mechanism during fracture. The elongation at fracture and the necking behaviour change, while the modulus of elasticity and tensile strength are minimally affected. For hydrogen-loaded RM specimens, a strain rate dependence of the failure mechanisms was demonstrated.

Keywords: AM316L; Remelting-Strategy; Microstructure Development; Hydrogen Embrittlement