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Hydrogen embrittlement and mechanical properties of 9 % Cr P92 steel and P91 weld metal

  • Martensitic 9 %-Cr steels like P91 and P92 can show an increased susceptibility to delayed hydrogen assisted cracking. The focus of this study was the microstructure and heat treatment effect on the mechanical properties of P92 base material and P91 multi-layer weld metal in both as-welded and post weld heat treated (PWHT) condition. Tensile tests with hydrogen free reference samples and electrochemically hydrogen charged samples were carried out, the mechanical properties were assessed and supported by dedicated fractographic analysis. In addition, hydrogen and microstructure dependent fracture criteria were calculated. All investigated microstructures showed a hydrogen influenced degradation of the mechanical properties compared to the hydrogen free reference samples. In that connection, the as welded martensitic P91 weld metal had the highest degree of degradation in presence of hydrogen. The P91 PWHT weld metal and the P92 base material had comparable properties. From that pointMartensitic 9 %-Cr steels like P91 and P92 can show an increased susceptibility to delayed hydrogen assisted cracking. The focus of this study was the microstructure and heat treatment effect on the mechanical properties of P92 base material and P91 multi-layer weld metal in both as-welded and post weld heat treated (PWHT) condition. Tensile tests with hydrogen free reference samples and electrochemically hydrogen charged samples were carried out, the mechanical properties were assessed and supported by dedicated fractographic analysis. In addition, hydrogen and microstructure dependent fracture criteria were calculated. All investigated microstructures showed a hydrogen influenced degradation of the mechanical properties compared to the hydrogen free reference samples. In that connection, the as welded martensitic P91 weld metal had the highest degree of degradation in presence of hydrogen. The P91 PWHT weld metal and the P92 base material had comparable properties. From that point of view, a significantly increased risk for hydrogen assisted cold cracking during welding fabrication of P91 weld joints must be considered before any heat treatment is conducted.zeige mehrzeige weniger

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  • IIW_Annual_Rhode_IX-C-1102-2022_V03_final.pdf
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Metadaten
Autor*innen:Tim Richter, Michael RhodeORCiD
Koautor*innen:Jonathan Nietzke, Tobias Mente, P. Mayr, A. Nitsche
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2022
Organisationseinheit der BAM:9 Komponentensicherheit
9 Komponentensicherheit / 9.0 Abteilungsleitung und andere
9 Komponentensicherheit / 9.2 Versuchsanlagen und Prüftechnik
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Angewandte Physik
Freie Schlagwörter:Creep-resistant steel; Degradation; Hydrogen assisted cracking; Mechanical properties; Weld joint
Themenfelder/Aktivitätsfelder der BAM:Energie
Energie / Wasserstoff
Material
Material / Degradation von Werkstoffen
Veranstaltung:IIW Annual Assembly, Meeting of Commission IX-C
Veranstaltungsort:Tokyo, Japan
Beginndatum der Veranstaltung:21.07.2022
Enddatum der Veranstaltung:21.07.22
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:10.08.2022
Referierte Publikation:Nein
Eingeladener Vortrag:Nein
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