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Strain hardening effect of CF8M stainless steel in the environment fatigue test under pressurized water reactor condition |
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| Authors: | Ill-Seok Jeong Gag-Hyeon Ha Hyun-Ik Jun |
| Institution: | 1. KEPRI, Nuclear Power Research Laboratory, 103-16 Munjidong, Yuseongku, Daejeon 305-380, Republic of Korea;2. KLES, PP2-320, 35-3 Hongchonri, Ipjangmyun, Chonan, Chungnam 330-825, Republic of Korea;1. Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON M5S 3E5, Canada;2. Surface Science Western, University of Western Ontario, 999 Collip Circle, London, ON N6G 0J3, Canada;1. Institute for Energy and Transport, Joint Research Centre, European Commission, PO Box 2, 1755ZG Petten, The Netherlands;2. Czech Technical University in Prague, Faculty of Nuclear Science and Physical Engineering, Dep. of Materials, 120 00 Prague 2, Czech Republic |
| Abstract: | To develop a fatigue design curve of cast stainless steel CF8M that has been used in piping material of nuclear power plants, a low cycle fatigue tests were conducted in the environment of a pressurized water reactor at 15 MPa and 315 °C. Cylindrical solid fatigue specimens were used for the strain-controlled environmental fatigue tests. Fatigue life was measured in terms of the number of cycles with the variation of strain amplitudes at 0.04%/s strain rate. This paper focuses on the characteristics of the cyclic strain hardening effect caused during environment fatigue tests of the CF8M cast stainless steel. The process and method of correcting fatigue test data in this paper would be so useful to produce reliable data of environmental fatigue curves for the material in operating condition of high pressure and high temperature water environments. |
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