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Numerical investigations on hydrogen-assisted cracking (HAC) in duplex stainless steels

  • Duplex stainless steels have been used for a long time in the offshore industry, since they have higher strength than conventional austenitic stainless steels and they exhibit a better ductility as well as an improved corrosion resistance in harsh environments compared to ferritic stainless steels. However, despite these good properties the literature shows some failure cases of duplex stainless steels in which hydrogen plays a crucial role for the cause of the damage. Numerical simulations can give a significant contribution in clarifying the damage mechanisms. Therefore, a numerical model of a duplex stainless steel microstructure was developed enabling simulation of crack initiation and propagation in both phases. The phase specific stress strain analysis revealed that local plastic deformation occurs in both austenite and δ-ferrite already in the macroscopically elastic range. Altogether, phase specific hydrogen-assisted material damage was simulated for the first time taking intoDuplex stainless steels have been used for a long time in the offshore industry, since they have higher strength than conventional austenitic stainless steels and they exhibit a better ductility as well as an improved corrosion resistance in harsh environments compared to ferritic stainless steels. However, despite these good properties the literature shows some failure cases of duplex stainless steels in which hydrogen plays a crucial role for the cause of the damage. Numerical simulations can give a significant contribution in clarifying the damage mechanisms. Therefore, a numerical model of a duplex stainless steel microstructure was developed enabling simulation of crack initiation and propagation in both phases. The phase specific stress strain analysis revealed that local plastic deformation occurs in both austenite and δ-ferrite already in the macroscopically elastic range. Altogether, phase specific hydrogen-assisted material damage was simulated for the first time taking into account all main factors influencing hydrogen assisted cracking process. The results agree well with experimental observations and thus allow a better insight in the mechanism of hydrogen-assisted material damage.zeige mehrzeige weniger

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Metadaten
Autor*innen:Tobias MenteORCiD, Thomas Böllinghaus
Persönliche Herausgeber*innen:W. Udomkichdecha, A. Mononukul, Thomas Böllinghaus, Jürgen Lexow
Dokumenttyp:Beitrag zu einem Sammelband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Materials for energy infrastructure
Jahr der Erstveröffentlichung:2016
Verlag:Springer
Erste Seite:21
Letzte Seite:31
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Freie Schlagwörter:Duplex stainless steel (DSS); FEM; Hydrogen-assisted cracking (HAC); Mesoscale model; Numerical simulation
Veranstaltung:4th WMRIF Young scientists workshop
Veranstaltungsort:Boulder, CO, USA
Beginndatum der Veranstaltung:2014-09-08
Enddatum der Veranstaltung:2014-09-10
DOI:10.1007/978-981-287-724-6_3
ISBN:978-981-287-723-9
ISBN:978-981-287-724-6
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Nein
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