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Effects of long-term thermal aging on bulk and local mechanical behavior of ferritic-austenitic duplex stainless steels
- Source :
- Materials Science and Engineering: A. 720:130-139
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- Ferritic-austenitic cast duplex stainless steels (CDSS) undergo significant thermal aging embrittlement in service in light water nuclear reactors. Cast CF–3 and CF–8 duplex stainless steels have been laboratory aged for up to 17,200 h at four different temperatures (280 °C, 320 °C, 360 °C, 400 °C) in order to characterize the evolution of microstructure and mechanical properties. Standard Charpy V-Notch (CVN) impact testing and tensile testing have been conducted to measure the progression of embrittlement of the steels. Concurrently, nanoindentation measurements were performed to measure the hardening of the individual ferrite and austenite phases. Atom probe tomography (APT) analysis of the constituent phases is used to investigate the relationship between spinodal decomposition of the ferrite and the mechanical property evolution during aging. The effects of the local microstructure and property changes in the ferrite phase on the overall bulk mechanical property degradation of these steels are discussed.
- Subjects :
- 010302 applied physics
Austenite
Materials science
Mechanical Engineering
Metallurgy
Charpy impact test
02 engineering and technology
Nanoindentation
021001 nanoscience & nanotechnology
Condensed Matter Physics
Microstructure
01 natural sciences
6. Clean water
Mechanics of Materials
Ferrite (iron)
0103 physical sciences
Hardening (metallurgy)
General Materials Science
0210 nano-technology
Embrittlement
Tensile testing
Subjects
Details
- ISSN :
- 09215093
- Volume :
- 720
- Database :
- OpenAIRE
- Journal :
- Materials Science and Engineering: A
- Accession number :
- edsair.doi...........32434ca21025c4a6913a99d1e0115e93