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Hardening effect of diffusible hydrogen on BCC Fe-based model alloys by in situ backside hydrogen charging

Rao, Jing; Lee, Subin 1; Dehm, Gerhard; Duarte, María Jazmin
1 Institut für Angewandte Materialien – Werkstoff- und Grenzflächenmechanik (IAM-MMI), Karlsruher Institut für Technologie (KIT)

Abstract:

Hydrogen embrittlement is common in metallic materials and a critical issue in industries involving hydrogen-related processes. Here we investigate the mechanical response upon hydrogen loading of ferritic Fe-16Cr, Fe-21Cr and Fe-4Al alloys. We use a novel in situ setup for electrochemical backside hydrogen charging during nanoindentation. Single-phase ferritic Fe-Cr binary alloys with high hydrogen diffusivity and low solubility, are ideal for in situ studies during hydrogen charging, particularly the effect of diffusible and lightly trapped hydrogen is targeted. The hardness increases linearly with increasing hydrogen content until a quasi-equilibrium state between hydrogen absorption and desorption is reached while Young's modulus remains unaffected. Above this transient region, the slope of the absolute hardness experiences a drastic decrease. The hardness variation in Fe-21Cr is anisotropic as determined for (1 0 0), (1 1 0) and (1 1 1) oriented grains. Increasing the Cr content enhances the hardening effect in (1 0 0) orientation: a 16.7 % hardness increase is observed in Fe-21Cr, while Fe-16Cr, shows an increment of 10.8 %. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000162229
Veröffentlicht am 14.09.2023
Originalveröffentlichung
DOI: 10.1016/j.matdes.2023.112143
Scopus
Zitationen: 9
Web of Science
Zitationen: 8
Dimensions
Zitationen: 10
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Werkstoff- und Grenzflächenmechanik (IAM-MMI)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 08.2023
Sprache Englisch
Identifikator ISSN: 0264-1275
KITopen-ID: 1000162229
HGF-Programm 43.31.01 (POF IV, LK 01) Multifunctionality Molecular Design & Material Architecture
Erschienen in Materials & Design
Verlag Elsevier
Band 232
Seiten Art.-Nr.: 112143
Vorab online veröffentlicht am 08.07.2023
Schlagwörter bcc FeCr alloys, Hydrogen embrittlement, In situ nanoindentation, Hardness, Elastic modulus, Diffusible hydrogen
Nachgewiesen in Scopus
Dimensions
Web of Science
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