The mean stress effect on the fatigue life of Type 316 stainless steel was investigated at 325°C in simulated PWR primary water. It was shown that, as shown in high-temperature air environment, the fatigue life was extended by applying the mean stress under the same stress amplitude. An increase in the maximum peak stress by applying the mean stress induced additional plastic strain and this hardened the material. On the other hand, the fatigue life was shortened by the mean stress for the same strain range. The ratcheting strain caused by applying mean stress accelerated crack mouth opening and reduced fatigue life. It was also shown that the fatigue life in the simulated PWR primary water was shorter than that in air even without the mean stress. The magnitude of the reduction depended on the strain range. The reduction in fatigue life was the maximum when the strain range was 0.6%. The environmental effect disappeared when the effective strain was less than 0.4%.
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ASME 2017 Pressure Vessels and Piping Conference
July 16–20, 2017
Waikoloa, Hawaii, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-5790-8
PROCEEDINGS PAPER
Mean Stress Effect on Fatigue Properties of Type 316 Stainless Steel: Part II — In PWR Primary Water Environment
Masayuki Kamaya
Masayuki Kamaya
Institute of Nuclear Safety System, Inc., Fukui, Japan
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Masayuki Kamaya
Institute of Nuclear Safety System, Inc., Fukui, Japan
Paper No:
PVP2017-65136, V01AT01A017; 8 pages
Published Online:
October 26, 2017
Citation
Kamaya, M. "Mean Stress Effect on Fatigue Properties of Type 316 Stainless Steel: Part II — In PWR Primary Water Environment." Proceedings of the ASME 2017 Pressure Vessels and Piping Conference. Volume 1A: Codes and Standards. Waikoloa, Hawaii, USA. July 16–20, 2017. V01AT01A017. ASME. https://doi.org/10.1115/PVP2017-65136
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