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Review of Thermal Aging of Nuclear Grade Stainless Steels |
Xiaodong LIN,Qunjia PENG( ),En-Hou HAN,Wei KE |
Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
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Abstract Nuclear grade cast and welded austenitic stainless steels are subjected to thermal aging during long-term service in light water nuclear reactors (LWRs), primarily due to the existence of certain amount of ferrite in the steels. The thermal aging results in degradation of the mechanical and corrosion properties of the steels, which leads to a potential concern to the structural integrity of the relevant LWR components. This paper reviewed the recent research progress of the effect of thermal aging on microstructures and properties of the nuclear grade cast and welded stainless steels, as well as the kinetics, assessment and prediction methods for thermal aging. The mechanism of thermal aging induced embrittlement was discussed. Challenges and trends for the research of thermal aging in the future were also briefly addressed.
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Received: 07 June 2016
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Fund: Supported by National Natural Science Foundation of China (51571204) |
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