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http://dx.doi.org/10.3795/KSME-A.2014.38.1.011

Environmental Fatigue Behaviors of CF8M Stainless Steel in 310℃ Deoxygenated Water - Effects of Hydrogen and Microstructure  

Jang, Hun (Dept. of Nuclear and Quantum Engineering, KAIST)
Cho, Pyungyeon (Dept. of Nuclear and Quantum Engineering, KAIST)
Jang, Changheui (Dept. of Nuclear and Quantum Engineering, KAIST)
Kim, Tae Soon (Central Research Institute, KHNP)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.38, no.1, 2014 , pp. 11-16 More about this Journal
Abstract
The effects of environment and microstructure on low cycle fatigue (LCF) behaviors of CF8M stainless steels containing 11% of ferrites were investigated in a $310^{\circ}C$ deoxygenated water environment. The reduction of LCF life of CF8M in a $310^{\circ}C$ deoxygenated water was smaller than 316LN stainless steels. Based on the microstructure and fatigue surface analyses, it was confirmed that the hydrogen induced cracking contributed to the reduction in LCF life for CF8M as well as for 316LN. However, many secondary cracks were found on the boundaries of ferrite phases in CF8M, which effectively reduced the stress concentration at the crack tip. Because of the reduced stress concentration, the accelerated fatigue crack growth by hydrogen induced cracking was less significant, which resulted in the smaller environmental effects for CF8M than 316LN in a $310^{\circ}C$ deoxygenated water.
Keywords
Low Cycle Fatigue; Cast Stainless Steel; Hydrogen Induced Cracking; Ferrite;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 Tsutsumi, K., Kanasaki, H., Umakoshi, T., Nakamura, T., Urata, S., Mizuta, H. and Nomoto, S., 2000, "Fatigue Life Reduction in PWR Water Environment for Stainless Steels," Proc. of Pressure Vessel & Piping, New York, USA, Vol. 410-2, pp. 23-34
2 Chopra, O. K. and Shack, W. J., 2001, Environmental Effects on Fatigue Crack Initiation in Piping and Pressure Vessel Steels, NUREG/CR-6717, Argon National Laboratory.
3 Jang, H., Cho, H., Jang, C., Kim, T. S. and Moon, C. K., 2008, "Effect of Cyclic Strain Rate and Sulfides on Environmentally Assisted Cracking Behaviors of SA508 Gr.1a Low Alloy Steel in Deoxygenated Water at $310^{\circ}C$," Nucl. Eng. Technol., Vol. 40, pp. 225-232.   DOI   ScienceOn
4 Lynch, S. P., 2003, Mechanisms of Hydrogen Assisted Cracking - A Review, The Minerals, Metals & Materials Society (TMS), Warrendale, Pennsylvania, pp. 449-466.
5 Murakami, Y. and Matsuoka, S, 2010, "Effect of Hydrogen on Fatigue Crack Growth of Metals," Eng. Fracture Mech., Vol. 77, pp. 1926-1940.   DOI   ScienceOn
6 Gerland, M., Alain, R., Ait Saadi, B. and Mendez, J., 1997, "Low Cycle Fatigue Behavior in Vaccum of a 316L-Type Austenitic Stainless Steel Between 20 and $600^{\circ}C$ - Part II: Dislocation Structure Evolution and Correlation with Cyclic Behavior," Mater. Sci. & Eng. A, Vol. 229, pp. 68-86.   DOI   ScienceOn
7 Mannan, S. L., 1993, "Role of Dynamic Strain Ageing in Low Cycle Fatigue," Bull. Mater. Sci., Vol. 16, No. 6, pp. 561-582.   DOI
8 Robertson, I. M., 1999, "The Effect of Hydrogen on Dislocation Dynamics," Eng. Fracture Mech., Vol. 64, pp. 649-673.   DOI   ScienceOn
9 Hong, S. G., Lee, K. O. and Lee, S. B., 2005, "Dynamic Strain Aging Effect on the Fatigue Resistance of Type 316L Stainless Steel," Int. J. of Fatigue, Vol. 27, pp. 1420-1424.   DOI   ScienceOn
10 Chopra, O. K. and Shack, W. J., 2006, Effect of LWR Coolant Environments on the Fatigue Life of Reactor Materials, NUREG/CR-6909, Argon National Laboratory.
11 Higuchi, M., Sakaguchi, K., Nomura, Y. and Hirano, A., 2007, "Final Proposal of Environmental Fatigue Life Correction Factor ($F_{en}$) for Structural Materials in LWR Water Environment," Proc. of Pressure Vessel & Piping, ASME, Texas, USA, PVP2007-26100.
12 Cho, H., Kim, B. K., Kim, I. S., Jang, C. and Jung, D. Y., 2007, "Fatigue Life and Crack Growth Mechanisms of the Type 316LN Austenitic Stainless Steel in $310^{\circ}C$ Deoxygenated Water," J. of Nucl. Sci. & Technol., Vol. 44, pp. 1007-1014.   DOI
13 Cho, H., Kim, B. K., Kim, I. S. and Jang, C., 2008, "Low Cycle Fatigue Behaviors of Type 316LN Austenitic Stainless Steel in $310^{\circ}C$ Deaerated Water - Fatigue Life and Dislocation Structure Development," Mater. Sci. & Eng. A, Vol. 476, pp. 248-256.   DOI   ScienceOn
14 Chopra, O. K. and Shack, W. J., 2002, Mechanism and Estimation of Fatigue Crack Initiation in Austenitic Stainless Steels in LWR Environments, NUREG/CR-6787, Argon National Laboratory.
15 Rho, B. S., Hong, H. U. and Nam, S. W., 2000, "The Effect of ${\delta}$-Ferrite on Fatigue Cracks in 304L Steels," Int. J. of Fatigue, Vol. 22, pp. 683-690.   DOI   ScienceOn
16 Jang, C., Cho, P. Y., Kim, M. Oh, S. J. and Yang, J. S., 2010, "Effects of Microstructure and Residual Stress on Fatigue Crack Growth of Stainless Steel Narrow Gap Welds," Mater. & Des., Vol. 31, pp. 1862-1870.   DOI   ScienceOn
17 Stolarz, J. and Foct, J., 2001, "Specific Features of Two Phase Alloys Response to Cyclic Deformation," Mater. Sci. & Eng. A, Vol. 319, pp. 501-505.
18 Zhao, Y. X., Gao, Q. and Wang, J. N., 1999, "Microstructural Effects on the Short Crack Behavior of a Stainless Steel Weld Metal during Low-Cycle Fatigue," Fatigue, Fracture of Eng. Mater. & Struct., Vol. 22, pp. 469-480.   DOI
19 Mediratta, S. R., Ramaswamy, V. and Rama Rao, P., 1985, "Influence of Ferrite-Martensite Microstructural Morphology on the Low Cycle Fatigue of a Dual-Phase Steel," Int. J. of Fatigue, Vol. 7, pp. 107-115.   DOI   ScienceOn
20 Jang, H., Kim, J. H., Jang, C., Lee, J. G. and Kim, T. S., 2013, "Low-cycle Fatigue Behaviors of Two heats of SA508 Gr.1a Low Alloy Steel in $310^{\circ}C$ air and Deoxygenated Water - Effects of Dynamic Strain Aging and Microstructure," Submitted to Mater. Sci. & Eng. A.
21 Cho, H., Kim, B. K., Kim, I. S., Oh, S. J., Jung, D. Y. and Byeon, S. C., 2005, "Environmental Fatigue Testing of Type 316 Stainless Steel in $310^{\circ}C$ Water," Proc. of Pressure Vessel & Piping, ASME Colorado, USA, PVP2005-71493.
22 Higuchi, M., Tsutsumi, K., Hirano, A. and Sakaguchi, K., 2003, "A Proposal of Fatigue Life Correction Factor $F_{en}$ for Austenitic Stainless Steels in LWR Water Environments," J. of Pressure Vessel & Piping, Vol. 125, pp. 403-410.   DOI   ScienceOn