The role of He irradiation in the corrosion behaviour of T91 in high-temperature steam. (15th August 2021)

• Record Type: Journal Article
• Authors: Liu, Chao; Shen, Tielong; Jin, Peng; Wang, Ji; Chang, Hailong; Zhu, Yabin; Cui, Minghuan; Chai, Jianlong; Wang, Zhiguang
• Is Part Of: Corrosion science. Volume 189(2021)
• Publication Date: 2021-08-15
• Subjects: A. Steel -- B. Ion implantation -- B. TEM -- B. SEM -- C. Oxidation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109602
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: The oxidation rate of T91 was promoted owing to the oxide microstructure change induced by He irradiation. He irradiation did not modify the oxide structure but induced a more porous oxide. The porous oxide was helpful to create more diffusion pathways and available growing space. Under the synergetic influence of displacement damage and He bubbles, the oxide thickness increased obviously. Abstract: The role of He irradiation in the corrosion behaviour of T91 ferritic/martensitic steel in high-temperature steam was investigated. Although irradiation did not modify the duplex character of the oxide or its structure, the microstructure and thickness of the oxide layer were severely affected by the irradiation, which induced the formation of a more porous and thicker oxide. He irradiation contributed to the rate-limiting step (internal diffusion of oxygen) of oxidation by making the oxide more porous and consequently creating more diffusion pathways and available growing space, which increased the oxidation rate of T91 as the irradiation dose was increased.