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Thickness and microstructure effect on hydrogen diffusion in creep-resistant 9 % Cr P92 steel and P91 weld metal

  • Martensitic 9 %-Cr steels like P91 and P92 show susceptibility to delayed hydrogen assisted cracking depending on their microstructure. In that connection, effective hydrogen diffusion coefficients are used to assess the possible time-delay. The small number of available diffusion coefficients varies already at room temperature by several orders of magnitude (mostly regarded as result of present microstructure). Especially P91 weld metal diffusion coefficients are rare so far. For that reason, electrochemical permeation experiments had been conducted using P92 base metal and P91 weld metal (in as-welded and heat-treated condition) with different thicknesses. The diffusion coefficients are calculated by two methods (time-lag and inflection point method) were performed. The results show that, despite of microstructural effects, the sample thickness must be considered as it influences the calculated diffusion coefficients. Finally, the comparison of calculated and measured hydrogenMartensitic 9 %-Cr steels like P91 and P92 show susceptibility to delayed hydrogen assisted cracking depending on their microstructure. In that connection, effective hydrogen diffusion coefficients are used to assess the possible time-delay. The small number of available diffusion coefficients varies already at room temperature by several orders of magnitude (mostly regarded as result of present microstructure). Especially P91 weld metal diffusion coefficients are rare so far. For that reason, electrochemical permeation experiments had been conducted using P92 base metal and P91 weld metal (in as-welded and heat-treated condition) with different thicknesses. The diffusion coefficients are calculated by two methods (time-lag and inflection point method) were performed. The results show that, despite of microstructural effects, the sample thickness must be considered as it influences the calculated diffusion coefficients. Finally, the comparison of calculated and measured hydrogen concentrations (determined by carrier gas hot extraction) enables the identification of realistic diffusion coefficients.zeige mehrzeige weniger

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  • IIW_Annual_Rhode_IX-C-1096-2021.pdf
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Metadaten
Autor*innen:Michael RhodeORCiD
Koautor*innen:Tim Richter, Tobias Mente, P. Mayr, A. Nitsche
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2021
Organisationseinheit der BAM:9 Komponentensicherheit
9 Komponentensicherheit / 9.0 Abteilungsleitung und andere
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Freie Schlagwörter:Creep-resistant steel; Diffusion; Electrochemical permeation; Hydrogen; Welding
Themenfelder/Aktivitätsfelder der BAM:Energie
Energie / Wasserstoff
Material
Material / Degradation von Werkstoffen
Veranstaltung:IIW Annual Assembly, Meeting of Commission IX-C
Veranstaltungsort:Online meeting
Beginndatum der Veranstaltung:15.07.2021
Enddatum der Veranstaltung:15.07.2021
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:02.08.2021
Referierte Publikation:Nein
Eingeladener Vortrag:Nein
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