Influence of second phase particles on corrosion resistance of N36 alloy in superheated steam |
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| Affiliation: | 1. Department of Engineering, Lancaster University, Lancaster, LA1 4YW, United Kingdom;2. Hybrid Instruments Ltd., Gordon Manley Building, Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, United Kingdom;3. Pajarito Scientific Corporation, 2976 Rodeo Park Drive East, Sante Fe, NM, 87505, United States;1. NEMO Group, Dipartimento Energia, Politecnico di Torino, 10129, Torino, Italy;2. PPPT Department, EUROfusion Consortium, 85748, Garching bei München, Germany;1. Department of Energy Engineering and Physics, Tehran Polytechnic University, 424 Hafez Ave., 15875-4413, Tehran, Iran;2. Nuclear Safety and Radiation Protection Research Group, Nuclear Science and Technology Research Institute, End of North Karegar Ave., 14359-836, Tehran, Iran;1. School of Nuclear Science and Technology, Xi''an Jiaotong University, Xi''an, Shaanxi, 710049, China;2. Canadian Nuclear Safety Commission, Ottawa, Ontario, Canada |
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| Abstract: | The nodular corrosion resistance of N36 (Zr–0.8Sn–1Nb–0.3Fe–0.12O, wt%) alloy with different temperatures of interstage annealing and optimized Zircaloy-4 (lower content of tin) cladding tubes were tested in 500 °C and 10.3 MPa superheated steam. The result showed that no nodular spots appeared on surface of N36 alloy cladding tubes after 500 h corrosion, while nodular spots on optimized Zircaloy-4 tubes after 8 h. The differences of weight gain between two kinds of N36 tubes suggested that the percentage (volume fraction) of tetragonal Zr dioxide in oxide film can be effectively influenced by characteristics, such as size, of the second phase particles on the oxide film-matrix boundary. The analysis by SEM and LRS clearly indicated that smaller and fine distributed second phase particles were beneficial to stabilize the oxide via endure the uniform stress so it could slow down the altering process from tetragonal Zr dioxide to monoclinic Zr dioxide. |
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| Keywords: | Second phase particles Corrosion resistance Zirconium alloy Superheated steam Tetragonal zirconium dioxide |
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