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TECHNICAL PAPERS

Effects of Water Flow Rate on Fatigue Life of Carbon Steel in Simulated LWR Environment Under Low Strain Rate Conditions

[+] Author and Article Information
Akihiko Hirano

Mechanical Engineering, Research Laboratory, Hitachi, Ltd., Hitachi, Ibaraki, Japan

Michiyoshi Yamamoto

Power and Industrial Systems, Nuclear System Division, Hitachi, Ltd., Hitachi, Ibaraki, Japan

Katsumi Sakaguchi

Japan Power Engineering and Inspection Corporation, Hitachinaka, Ibaraki, Japan

Tetsuo Shoji

Tohoku University, Sendai, Miyagi, Japan

Kunihiro Iida

University of Tokyo, Koshigaya, Saitama, Japan

J. Pressure Vessel Technol 125(1), 52-58 (Jan 31, 2003) (7 pages) doi:10.1115/1.1460906 History: Received January 01, 2001; Revised November 02, 2001; Online January 31, 2003
Copyright © 2003 by ASME
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References

Higuchi,  M., and Iida,  K., 1991, “Fatigue Strength Correction Factors for Carbon and Low-Alloy Steels in Oxygen-Containing High-Temperature Water,” Nucl. Eng. Des., 129, p. 293.
Chopra, O. K., and Shack, W. J., 1998, “Fatigue Crack Initiation in Carbon and Low-Alloy Steels in Light Water Reactor Environments—Mechanism and Prediction,” ASME PVP-Vol. 374, p. 155.
Nakao, G., Higuchi, M., Kanasaki, H., Iida, K., and Asada, Y., 1997, “Effects of Temperature and Dissolved Oxygen Contents on Fatigue Lives of Carbon and Low Alloy Steels in LWR Water Environments,” Effects of the Environment on the Initiation of Crack Growth, ASTM STP1298, p. 232.
Higuchi, M., 2000, “Revised Proposal of Fatigue Life Correction Factor Fen for Carbon and Low Alloy Steels in LWR Water Environments,” ASME PVP-Vol. 410-2, p. 35.
Chopra, O. K., and Shack, W. J., 1999, “Methods of Incorporating Effects of LWR Coolant Environment into ASME Code Fatigue Evaluations,” ASME PVP-Vol. 386, p. 171.
Mehta, H. S., 2000, “An Update on the Consideration of Reactor Water Effects in Code Fatigue Initiation Evaluations for Pressure Vessels and Piping,” ASME PVP-Vol. 410-2, p. 45.
Lenz, E., Wieling, N., and Munster, H., 1987, “Influence of Variation of Flow Rates and Temperature on the Cyclic Crack Growth Rate under BWR Conditions,” Proc. 3rd Int. Symp. on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors. MI, eds. G. J. Theus and J. R. Weeks, The Metallurgical Society, Inc., p. 283.
Katada Y., and Kurosawa, K., 1999, “The Role of MnS Inclusions on Environmentally Assisted Cracking in High Temperature Water,” ASME PVP-Vol. 386, p. 249.
Hirano, A., Hirano A., and Hayashi, M., 1997, “Corrosion Fatigue Crack Initiation and Propagation Behavior of Carbon Steel in High Temperature Pure Water Environment,” Proc. Operating Pressure Equipment, IMMA, p. 59.
Hirano, A., Yamamoto, M., Sakaguchi, K., Iida K., and Shoji, T., 2000, “Effects of Water Flow Rate on Fatigue Life of Carbon Steel in High Temperature Pure Water Environment,” ASME PVP-Vol. 410-2, p. 13.
Abe, H., Hirano, A., Sakaguchi K., and Iida, K., 1999, “Fatigue Life of Carbon Steel STS410 in LWR Environments,” ASME PVP-Vol. 386, p. 241.
Hirano, A., Abe, H., Yamamoto, M., 1999, “A Cause of Fatigue Life Reduction and Dispersion of Carbon Steel in High Temperature Pure Water,” ASME PVP-Vol. 386, p. 201.
Atkinson,  J. D., Yu,  J., and Chen,  Z.-Y., 1996, “An Analysis of the Effects of Sulphur Content and Potential on Corrosion Fatigue Crack Growth in Reactor Pressure Vessel Steels,” Corros. Sci., 38, p. 755.

Figures

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Cross-sectional view of the test specimen and the water flow path
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Schematic illustration of the testing system
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Effect of water flow rate on fatigue life (strain amplitude: 0.3 %, strain rate: 0.4 %/s)
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Effect of water flow rate on fatigue life (strain amplitude: 0.3 %, strain rate: 0.01 %/s)
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Effect of water flow rate on crack initiation and propagation behavior at a strain rate of 0.01 %/s
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Illustration of one of the major effects of water flow rate on fatigue crack initiation in high-temperature water
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Fracture surface of a crack initiation site (water flow rate: 0.1 m/s)—(a) macroscopic view of the fracture surface; (b) magnified image of the crack initiation site
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Fracture surface of a crack initiation site (water flow rate: 7 m/s)—(a) macroscopic view of the fracture surface; (b) magnified image of the crack initiation site
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Effect of water flow rate on fatigue life (strain amplitude: 0.3 %, strain rate: 0.001 %/s)
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Effect of water flow rate on fatigue life (strain amplitude: 0.6 %, strain rate: 0.001 %/s)
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Effect of strain rate on fatigue life for various water flow rate conditions (DO: 1 ppm)
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Effect of strain rate on fatigue life for various water flow rate conditions (DO: 0.2 ppm)
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Effect of strain rate on fatigue life for various water flow rate conditions (DO: 0.05 ppm)

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