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Review on Stress Corrosion Crack Propagation Behavior of Cold Worked Nuclear Structural Materials in High Temperature and High Pressure Water |
Keqian ZHANG,Shilin HU(),Zhanmei TANG,Pingzhu ZHANG |
1. China Institute of Atomic Energy, Beijing 102413, China |
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Abstract The influence of cold work on the stress corrosion cracking (SCC), namely the crack growth rate (CGR) and the crack propagation orientations of the nuclear structural materials and especially the effect of temperature on the stress corrosion cracking, of the cold-worked steels and nickel base alloys were summarized. The effect cold-working processing on the SCC sensitivity was analyzed. The future trends of R&D in the field was also expounded. The cold rolling process induced elongated grains along the rolling direction, and the lamellar-like local strain areas generated at grain boundaries. Some deformation bands and a large number of dislocations and vacancies are formed inside the grain due to cold rolling, resulting in the increase of the stress corrosion cracking CGR. The localized oxidation of the grain deformation bands will affect the type of stress corrosion and the direction of crack propagation. The movement of defects at different temperatures will change the CGR of cracks. The future research should focus on the mechanism of stress corrosion cracking of old worked materials and the SCC behavior of cold-worked materials under actual service conditions.
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Received: 11 October 2017
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Corresponding Authors:
Shilin HU
E-mail: husl@ciae.cn
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