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

QC 20151125
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.

TEKNIK OCH TEKNOLOGIER Nanoteknik hsv//swe
ENGINEERING AND TECHNOLOGY Nano-technology hsv//eng
TEKNIK OCH TEKNOLOGIER Materialteknik hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering hsv//eng
TEKNIK OCH TEKNOLOGIER Materialteknik Metallurgi och metalliska material hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Metallurgy and Metallic Materials hsv//eng
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

Wessman, StenRISE,KIMAB(Swepub:ri)sten.wessman@swerea.se (author)
Thuvander, Mattias,1968Chalmers University of Technology, Sweden,Chalmers tekniska högskola(Swepub:cth)matthu (author)
Hedström, PeterKTH,Materialvetenskap,ENHETEN STRUKTURER,KTH Royal Institute of Technology, Sweden,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)(Swepub:kth)u1hu0w18 (author)
Odqvist, JoakimKTH,Materialvetenskap,ENHETEN STRUKTURER,KTH Royal Institute of Technology, Sweden,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)(Swepub:kth)u1dxktvd (author)
Pettersson, R. F. A.The Swedish Steel Producers' Association, Sweden,Jernkontoret (author)
Hertzman, S.Outokumpu Stainless Research Foundation, Sweden (author)
RISEKIMAB (creator_code:org_t)

By the author/editor: Pettersson, N.; Wessman, Sten; Thuvander, Matti ...; Hedström, Peter; Odqvist, Joakim; Pettersson, R. F ...; show more...; Hertzman, S.; show less...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Metallurgy and M ...

By the university: Royal Institute of Technology; RISE; Chalmers University of Technology

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