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Nanostructure evolution and mechanical property changes during aging of a super duplex stainless steel at 300°C

N. Pettersson ; S. Wessman ; Mattias Thuvander (Institutionen för teknisk fysik, Materialens mikrostruktur ) ; P. Hedström ; J. Odqvist ; R.F.A. Pettersson ; S. Hertzman
Materials Science and Engineering A (0921-5093). Vol. 647 (2015), p. 241-248.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Atom probe tomography (APT) , Duplex stainless steel , Mechanical properties , Phase separation , Spinodal decomposition , Transmission electron microscopy (TEM)



Denna post skapades 2015-09-30. Senast ändrad 2015-12-07.
CPL Pubid: 223405

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Materialens mikrostruktur (2012-2015)

Ämnesområden

Metallurgi och metalliska material

Chalmers infrastruktur