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MM: Fachverband Metall- und Materialphysik

MM 23: Topical Session: Hydrogen in Materials: from Storage to Embrittlement III

MM 23.1: Topical Talk

Tuesday, March 19, 2024, 11:45–12:15, C 130

Hydrogen trapping evaluation by thermal desorption spectroscopy coupled with advanced microstructural characterization: from BCC to FCC — Liese Vandewalle, Margot Pinson, Simon Vander Vennet, Lisa Claeys, Kim Verbeken, and •Tom Depover — Technologiepark 46, 9052 Zwijnaarde, Ghent University, Belgium

The most used technique to evaluate hydrogen trapping is thermal desorption spectroscopy (TDS). However, based on the TDS spectrum itself, one can find a variety of possible hydrogen trapping sites linked to specific microstructural features. Therefore, TDS should always be combined with advanced microstructural characterization to elucidate the hydrogen/metal interactions, where variations in defect density should be coupled with a corresponding increase/decrease in the TDS profile. In this work, the hydrogen trapping ability of a wide range of metals is considered, starting from ultra-low carbon steel (pure ferrite, BCC), over high carbon martensitic steels (BCT), towards the role retained austenite (FCC) can play in advanced high strength Q&P steels, ending with limitations of the technique in a pure austenitic microstructure. This is coupled with the characterization of the microstructure, studied by combined internal friction, positron annihilation spectroscopy, SEM-EBSD, XRD, DSC and TEM.

Keywords: Hydrogen trapping; Hydrogen diffusion; Microstructural characterization; Microscopy; Hydrogen embrittlement