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748 K (475 A degrees C) Embrittlement of Duplex Stainless Steel: Effect on Microstructure and Fracture Behavior
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science. The University of Manchester, United Kingdom.
2017 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 48A, no 4, 1653-1665 p.Article in journal (Refereed) Published
Abstract [en]

22Cr-5Ni duplex stainless steel (DSS) was aged at 748 K (475 A degrees C) and the microstructure development correlated to changes in mechanical properties and fracture behavior. Tensile testing of aged microstructures confirmed the occurrence of 748 K (475 A degrees C) embrittlement, which was accompanied by an increase of strength and hardness and loss of toughness. Aging caused spinodal decomposition of the ferrite phase, consisting of Cr-enriched alpha aEuro(3) and Fe-rich alpha' and the formation of a large number of R-phase precipitates, with sizes between 50 and 400 nm. Fracture surface analyses revealed a gradual change of the fracture mode from ductile to brittle delamination fracture, associated with slip incompatibility between ferrite and austenite. Ferrite became highly brittle after 255 hours of aging, mainly due to the presence of precipitates, while austenite was ductile and accommodated most plastic strain. The fracture mechanism as a function of 748 K (475 A degrees C) embrittlement is discussed in light of microstructure development.

Place, publisher, year, edition, pages
SPRINGER , 2017. Vol. 48A, no 4, 1653-1665 p.
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-206278DOI: 10.1007/s11661-016-3944-2ISI: 000396057300016ScopusID: 2-s2.0-85009725354OAI: oai:DiVA.org:kth-206278DiVA: diva2:1094702
Note

QC 20170510

Available from: 2017-05-10 Created: 2017-05-10 Last updated: 2017-05-10Bibliographically approved

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CiteExportLink to record
Permanent link

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Citation style
  • apa
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Language
  • de-DE
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  • nn-NO
  • nn-NB
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Output format
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