High temperature low cycle fatigue properties of 24Cr ferritic stainless steel for SOFC applications

Title
High temperature low cycle fatigue properties of 24Cr ferritic stainless steel for SOFC applications
Authors
김병규김동익최인석정우상권숙인
Keywords
Low cycle fatigue; Fatigue life; Stainless steel; Oxidation; Solid oxide fuel cell
Issue Date
2013-08
Publisher
Materials science & engineering. A, Structural materials : properties, microstructure and processing
Citation
VOL 577, 81-86
Abstract
The low cycle fatigue (LCF) properties of 24Cr ferritic stainless steel for solid oxide fuel cell interconnects were investigated. The fatigue strength of 24Cr stainless steel decreased with increasing temperature, but the fatigue life increased at 600 °C and 700 °C. The fatigue behavior at room temperature (RT) was characterized as cyclic hardening followed by saturation and cyclic softening while marginal cyclic hardening was observed at 600 °C and 700 °C. The superior oxidation resistance of 24Cr stainless steel allows preventing the fatal impact of oxidation on the high-temperature fatigue life. Microstructural analysis showed that persistent slip bands (PSBs) developed prevalently at RT but not at 600 °C and 700 °C. Such temperature-dependent microstructural difference retarded the crack initiation and prolonged fatigue life at high temperatures.
URI
http://pubs.kist.re.kr/handle/201004/44868
ISSN
09215093
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KIST Publication > Article
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