Hydrogen-enhanced oxidation of ferrite phase in stainless steel cladding and the contribution to stress corrosion cracking in deaerated high temperature water

JOURNAL OF NUCLEAR MATERIALS

卷:557

Article

Cui, Tongming^1,2  Dong, Haiying^1,2  Xu, Xinhe^1,2  Ma, Jiarong^1,2  Lu, Zhanpeng^1,2  Tang, Yuanjie^1,2  Pan, Deng^1,2  Lozano-Perez, Sergio³  Shoji, Tetsuo⁴ 

[1] Shanghai Univ, Sch Mat Sci & Engn, Inst Mat, Shanghai 200072, Peoples R China

[2] Shanghai Univ, State Key Lab Adv Special Steel, Shanghai 200072, Peoples R China

[3] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

[4] Tohoku Univ, New Ind Creat Hatchery Ctr, Sendai, Miyagi 9808579, Japan

关键词: Stainless steel;    Ferrite;    Hydrogen;    Oxidation;    Stress corrosion cracking;    High temperature water;   

DOI  :  10.1016/j.jnucmat.2021.153209

来源: Elsevier

【 摘 要 】

Oxide film properties and stress corrosion cracking (SCC) behaviour are investigated in the 308L stainless steel cladding layer with and without being H-charged in a deaerated high temperature water. Phase boundary (PB) has lower oxidation resistance than austenite and delta-ferrite matrix. A compact and high Cr content-bearing inner oxide layer improves the oxidation resistance of the delta-ferrite phase without H charging. H-induced PB penetration oxidation and grain boundary (GB) preferential oxidation are observed in H-charged specimen due to the PB and GB act as H trapping sites. Charged H decreases the oxidation resistance of delta-ferrite and austenite. delta-Ferrite acts as a path for H diffusing and H flux facilitates mass transport, resulting in the poor oxidation resistance of delta-ferrite. The mechanism underlying the effect of H on the oxidation behaviours of delta-ferrite and austenitic phases, as well as SCC performance, are discussed. (C) 2021 Published by Elsevier B.V.

【 授权许可】

Free