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Journal of Materials Engineering and Performance

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03-01-2019

Comparative Study of Oxides Formed on Fusion Zone and Base Metal of Laser Welded Zr-1.0Sn-1.0Nb-0.1Fe Alloy

Authors: Chuang Cai, Liqun Li, Genchen Peng

Published in: Journal of Materials Engineering and Performance | Issue 2/2019

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Abstract

Numerous studies have primarily focused on the corrosion mechanism of zirconium alloy base metal. However, the corrosion resistance of weld beads or seams is of vital importance in the degradation of structural components in the reactor. In the present work, the corrosion resistance of the fusion zone and base metal of laser welded zirconium alloy joints was comparatively investigated. The microstructure morphologies, phase structures and strain fields of oxide films formed on fusion zone and base metal were observed and analyzed. The oxide thickness of the fusion zone was thicker than that of the base metal with prolonged corrosion. Compared to the base metal, the lower density of dislocations and level of strain values in the oxide film of the fusion zone indicated that the stress in the oxide film was lower. The phase transition from the tetragonal ZrO₂ to the monoclinic ZrO₂ could be suppressed due to the high level of stress, resulting in the better corrosion resistance of the base metal. Moreover, the second phase particles and non-βZr phase in the base metal contributed to the better corrosion resistance.

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Title: Comparative Study of Oxides Formed on Fusion Zone and Base Metal of Laser Welded Zr-1.0Sn-1.0Nb-0.1Fe Alloy
Authors: Chuang Cai
Liqun Li
Genchen Peng
Publication date: 03-01-2019
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 2/2019
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-018-3836-2

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