Hollow Specimen Technique for Tests in High-Pressure Hydrogen Gas: The Path Towards Standardisation and the Case Study of a Pipeline Steel and its Weld

  • The hollow specimen technique is a simple method that has the potential to make material qualification with gaseous pressurized hydrogen widely applicable for the hydrogen industry at low cost. The feasibility of this method has been demonstrated in several studies, leading to the establishment of an ISO committee for its standardization. Questions have emerged during this process, that currently prevent the method from being standardized for hydrogen testing. These questions relate to specimen geometry, specimen manufacturing and gas quality and are being systematically addressed in the TransHyDE-H2HohlZug project. The aim is to close the identified gaps towards the standardization of this method for hydrogen testing. This contribution presents the structure and milestones of the project, followed by the results regarding the influence of specimen production and its response to hydrogen effects. Depending on the production method, different roughness and residual stresses can beThe hollow specimen technique is a simple method that has the potential to make material qualification with gaseous pressurized hydrogen widely applicable for the hydrogen industry at low cost. The feasibility of this method has been demonstrated in several studies, leading to the establishment of an ISO committee for its standardization. Questions have emerged during this process, that currently prevent the method from being standardized for hydrogen testing. These questions relate to specimen geometry, specimen manufacturing and gas quality and are being systematically addressed in the TransHyDE-H2HohlZug project. The aim is to close the identified gaps towards the standardization of this method for hydrogen testing. This contribution presents the structure and milestones of the project, followed by the results regarding the influence of specimen production and its response to hydrogen effects. Depending on the production method, different roughness and residual stresses can be expected on the inner hole surface of the specimens. This is of importance since an increase in stress concentration sites have been found to be associated to a higher severity of hydrogen effects. This influence has been investigated after applying the following machining processes: a) drilled only; b) drilled and reamed; c) drilled and honed; d) electro-discharge machining (EDM) and honed; e) EDM and reamed. Roughness measurements using a profilometer, electron back-scatter diffraction (EBSD) analysis and microhardness tests have been performed previous to mechanical testing to infer on the effect of the different production methods on the surface of the inner hole. Next, the specimens were mechanically tested via slow strain rate tensile tests in a argon and in hydrogen, both at 150 bar and room temperature. Here, a strain-rate sensibility analysis was also performed to identify an optimal strain-rate for the mechanical tests. Based on the results an optimal production method is identified and proposed.zeige mehrzeige weniger

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Autor*innen:Tomás Grimault de FreitasORCiD
Koautor*innen:Florian KonertORCiD, Jonathan NietzkeORCiD, Oded SobolORCiD
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2025
Organisationseinheit der BAM:9 Komponentensicherheit
9 Komponentensicherheit / 9.1 Komponenten für Energieträger
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Angewandte Physik
Freie Schlagwörter:Austenitic Stainless Steel; H2HohlZug; High-Pressure Gaseous Hydrogen; Hollow Specimen Technique; Hydrogen; Hydrogen Embrittlement; Pipeline Steel; Tensile Test; TransHyDE
Themenfelder/Aktivitätsfelder der BAM:Energie
Energie / Wasserstoff
Veranstaltung:ASTM Conference on Hydrogen Materials
Veranstaltungsort:La Rochelle, France
Beginndatum der Veranstaltung:03.06.2025
Enddatum der Veranstaltung:06.06.2025
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:11.06.2025
Referierte Publikation:Nein
Eingeladener Vortrag (wissenschaftliche Konferenzen):Nein
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