Microstructural features and hydrogen diffusion in bcc FeCr alloys: a comparison between the Kelvin probe- and nanohardness based- methods

Bibliographic Details
Title: Microstructural features and hydrogen diffusion in bcc FeCr alloys: a comparison between the Kelvin probe- and nanohardness based- methods
Authors: Rao, Jing, Sun, Binhan, Ganapathi, Arulkumar, Dong, Xizhen, Hohenwarter, Anton, Wu, Chun-Hung, Rohwerder, Michael, Dehm, Gerhard, Duarte, Maria Jazmin
Publication Year: 2024
Collection: Condensed Matter
Subject Terms: Condensed Matter - Materials Science
More Details: Hydrogen embrittlement can result in a sudden failure in metallic materials, which is particularly harmful in industrially relevant alloys, such as steels. A more comprehensive understanding of hydrogen interactions with microstructural features is critical for preventing hydrogen-induced damage and promoting a hydrogen-based environment-benign economy. We use the Kelvin probe-based potentiometric hydrogen electrode method and thermal desorption spectroscopy to investigate hydrogen interactions with different hydrogen traps in ferritic FeCr alloys with different chromium contents, dislocation densities, and grain sizes. In addition, we confirm the validity of a novel nanohardness-based diffusion coefficient approach by performing in situ nanoindentation testing. Simultaneous acquisition of the dynamic time-resolved mechanical response of FeCr alloys to hydrogen and the hydrogen diffusivities in these alloys is possible during continuous hydrogen supply. Dislocations, grain boundaries and Cr atoms induce reversible hydrogen trapping sites in these ferritic alloys, leading to the reduction of the hydrogen diffusion coefficients and the increase of the absorbed hydrogen.
Comment: 39 pages, 11 figures
Document Type: Working Paper
Access URL: http://arxiv.org/abs/2409.02787
Accession Number: edsarx.2409.02787
Database: arXiv
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