Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1573973 | Materials Science and Engineering: A | 2015 | 8 Pages |
Abstract
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.
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Niklas Pettersson, Sten Wessman, Mattias Thuvander, Peter Hedström, Joakim Odqvist, Rachel F.A. Pettersson, Staffan Hertzman,