Research on representative stress and fracture ductility of P92 steel under multiaxial creep |
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| Affiliation: | 1. College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China;2. Department of Overseas New Ventures Assesment, The Research Institute of Petroleum Exploration and Development, Beijing 100083, China;1. Qingdao Industrial Energy Storage Technology Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No.189 Songling Road, Laoshan District, Shandong, Qingdao 266101, PR China;2. University of Chinese Academy of Sciences, 19A Yuquanlu Road, Beijing 100049, PR China;3. Division of Reaction Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, PR China;4. Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0397, Japan;1. Institute of Microelectronics, Tsinghua University, Beijing 100084, China;2. Department of Chemical Engineering, Tsinghua University, Beijing, 00084, China;3. Institute of Functional Nano and Soft Materials, Soochow University, Suzhou 215123, China;1. Institute of Microelectronics, Tsinghua University, Beijing 100084, China;2. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;3. Materials Research Institute, Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802, USA;4. Institute of Functional Nano and Soft Materials, Soochow University, Suzhou 215123, China;5. Research center for analysis and measurement, Kunming University of Science and Technology, Kunming 650093, China |
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| Abstract: | Creep experiments on both plain and notched specimens were conducted at 650 °C over a stress range of 120–185 MPa. The notch strengthening effect was found to exhibit in notched specimens. By using stress components at the skeletal point, several expressions of representative stress were compared to validate their effectiveness in predicting creep rupture lives of P92 steel under multiaxial stress states. The results showed that Hayhurst representative stress was more suitable for life predictions of P92 steel. In the mean time, the relationship between the fracture ductility and multiaxiality was presented to investigate the influence of the multiaxial stress states on creep rupture behavior of P92 steel. A more reasonable prediction model was proposed, and the validity of the model was verified by experimental data. |
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