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Nanostructure evolution and mechanical property changes during aging of a super duplex stainless steel at 300°C
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. (ENHETEN STRUKTURER)ORCID iD: 0000-0003-1102-4342
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2015 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 647, 241-248 p., 32735Article in journal (Refereed) Published
Abstract [en]

The nanostructure evolution and the corresponding changes in mechanical properties of a super duplex stainless steel 2507 (UNS S32750) during aging at 300. °C up to 12,000. h have been investigated. Microstructural studies using transmission electron microscopy and atom probe tomography show that subtle Cr concentration fluctuations develop during aging. The amplitude of the concentration fluctuations is proportional to the hardness of the ferrite phase, and it is also proportional to the decrease in room temperature impact toughness during aging. The fracture behaviour of the alloy changes gradually from ductile to cleavage fracture, upon aging. The cracks were found to propagate through the ferrite phase, partly along deformation twin interfaces, and delamination between the austenite and ferrite phases was observed.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 647, 241-248 p., 32735
Keyword [en]
Atom probe tomography (APT), Duplex stainless steel, Mechanical properties, Phase separation, Spinodal decomposition, Transmission electron microscopy (TEM), Brittle fracture, Ductile fracture, Electron microscopy, Failure (mechanical), Ferrite, Fracture, Fracture mechanics, High resolution transmission electron microscopy, Nanostructures, Probes, Transmission electron microscopy, Atom-probe tomography, Cleavage fracture, Concentration fluctuation, Cr concentration, Fracture behaviour, Room temperature, Super duplex stainless steel, Stainless steel
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:kth:diva-177210DOI: 10.1016/j.msea.2015.09.009ISI: 000364250100030Scopus ID: 2-s2.0-84941633959OAI: oai:DiVA.org:kth-177210DiVA: diva2:874037
Note

QC 20151125

Available from: 2015-11-25 Created: 2015-11-17 Last updated: 2017-12-01Bibliographically approved

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Odqvist, Joakim

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