Fatigue failure mechanism and life prediction of a cast duplex stainless steel after thermal aging

Can Guo, Dunji Yu, Xingyue Sun, Weiwei Yu, Xu Chen

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21 Scopus citations

Abstract

Pressurized piping systems in nuclear power plants made of cast duplex stainless steels (CDSSs) are subjected to thermal aging and fatigue. Low cycle fatigue tests on a nuclear grade CDSS revealed prolonged fatigue lives after thermal aging at 400 °C up to 10000 h. The underlying mechanism is mainly associated with the reduced plastic strain amplitude, which is presumably a result of thermal aging induced ferrite embrittlement and strengthening of austenite. A life prediction model was proposed with austenite microhardness incorporated into the Basquin-Coffin-Manson equation as a variable to reflect the effect of thermal aging.

Original languageEnglish
Article number106161
JournalInternational Journal of Fatigue
Volume146
DOIs
StatePublished - May 2021
Externally publishedYes

Funding

The authors gratefully acknowledge financial support for this work from the National Natural Science Foundation of China (Nos. 51505325 and 51435012)

FundersFunder number
National Natural Science Foundation of China51435012, 51505325

    Keywords

    • Duplex stainless steel
    • Hardness
    • Life prediction
    • Low cycle fatigue
    • Thermal aging

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