Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 647, Issue -, Pages 241-248Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.09.009
Keywords
Duplex stainless steel; Spinodal decomposition; Phase separation; Mechanical properties; Atom probe tomography (APT); Transmission electron microscopy (TEM)
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Funding
- Swedish government agency for innovation systems (VINNOVA)
- AB Sandvik Materials Technology
- Outokumpu Stainless AB
- Hugo Carlssons Stiftelse
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The nanostructure evolution and the corresponding changes in mechanical properties of a super duplex stainless steel 2507 (UNS S32750) during aging at 300 degrees 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. (C) 2015 Elsevier B.V. All rights reserved.
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