Anti-aging treatment of nuclear power plant steel

Zhao, Yan; He, Binyan; Saillet, Sébastien; Domain, Christophe; Le Delliou, Patrick; Perez, Michel and Qin, Rongshan (2018). Anti-aging treatment of nuclear power plant steel. Materials Science and Engineering: A, 735 pp. 73–80.

DOI: https://doi.org/10.1016/j.msea.2018.08.023

Abstract

Duplex stainless steel loses impact toughness quickly during its service at nuclear power plant station as pipe and boiler. Aging induced spinodal decomposition in ferrite phase is the mechanism behind this degradation. This work uses electropulsing to treat the aged steel at the service temperature. The charpy impact toughness and Vickers micro-hardness were recovered significantly. Thermoelectric power is recommended to measure the degree of spinodal decomposition in the aging processing, which was recovered by >83% by the electropulsing treatment. It was proved that the anti-aging treatment has nothing to do with the Ohm heating. Instead, the electropulsing-induced extra free energy change of -891 J/mol provided thermodynamic driving force for the regeneration processing. Electropulsing-enhanced diffusivity enables the anti-aging processing to be completed quickly.

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About

• Item ORO ID
• 56135
• Item Type
• Journal Item
• ISSN
• 0921-5093
• Project Funding Details

• Funded Project Name	Project ID	Funding Body
  Toward the Regeneration of Aged Stainless Steels	CLS-511-30	EDF Energy

• Keywords
• Duplex stainless steel; Aging; Charpy impact test; External electric field
• Academic Unit or School
• Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
  Faculty of Science, Technology, Engineering and Mathematics (STEM)
• Copyright Holders
• © 2018 Elsevier
• Depositing User
• Rongshan Qin