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 language | English |
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Article number | 106161 |
Journal | International Journal of Fatigue |
Volume | 146 |
DOIs | |
State | Published - May 2021 |
Externally published | Yes |
Funding
The authors gratefully acknowledge financial support for this work from the National Natural Science Foundation of China (Nos. 51505325 and 51435012)
Funders | Funder number |
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National Natural Science Foundation of China | 51435012, 51505325 |
Keywords
- Duplex stainless steel
- Hardness
- Life prediction
- Low cycle fatigue
- Thermal aging