The structure dependence of grain boundary passivation of Alloy 690 in high temperature water

Xingyu Feng; Shihao Zhang; Pengshuai Liu; Wenjun Kuang

doi:10.1016/j.actamat.2023.119368

The structure dependence of grain boundary passivation of Alloy 690 in high temperature water

Xingyu Feng
, Shihao Zhang
, Pengshuai Liu
, Wenjun Kuang

材料科学与工程学院

Xi'an Jiaotong University
Xi'an Rare Metal Materials Institute Co. Ltd

科研成果: 期刊稿件 › 文章 › 同行评审

38 引用（Scopus）

摘要

The oxidation behavior of grain boundaries (GBs) was investigated on Alloy 690 after exposure to simulated pressurized water reactor primary water. The tendency to form passive film above GB is positively related to Cr diffusivity along GB which is determined by GB structure. Highly-ordered GB like twin boundary is subject to penetrative oxidation as Cr diffusivity is very low. GBs with misorientation angle θ ≤17.4° can't support fast diffusion of Cr either and also show penetrative oxidation. When θ ranges between 17.4° and 28.7°, Cr diffusivity is enhanced a little and GB shows unstable passivation. Meanwhile, the Cr diffusivity along GB is also related to the atomic packing density of GB planes. GB with higher atom packing density exhibits lower Cr diffusivity and deeper intergranular oxide depth. As θ increases above 28.7°, Cr diffusion is fast enough to support the formation of protective film above GB.

源语言	英语
期刊论文编号	119368
期刊	Acta Materialia
卷	261
DOI	https://doi.org/10.1016/j.actamat.2023.119368
出版状态	已出版 - 1 12月 2023

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title = "The structure dependence of grain boundary passivation of Alloy 690 in high temperature water",

abstract = "The oxidation behavior of grain boundaries (GBs) was investigated on Alloy 690 after exposure to simulated pressurized water reactor primary water. The tendency to form passive film above GB is positively related to Cr diffusivity along GB which is determined by GB structure. Highly-ordered GB like twin boundary is subject to penetrative oxidation as Cr diffusivity is very low. GBs with misorientation angle θ ≤17.4° can't support fast diffusion of Cr either and also show penetrative oxidation. When θ ranges between 17.4° and 28.7°, Cr diffusivity is enhanced a little and GB shows unstable passivation. Meanwhile, the Cr diffusivity along GB is also related to the atomic packing density of GB planes. GB with higher atom packing density exhibits lower Cr diffusivity and deeper intergranular oxide depth. As θ increases above 28.7°, Cr diffusion is fast enough to support the formation of protective film above GB.",

keywords = "Alloy 690, Grain boundary diffusion, Grain boundary structure, Internal/external oxidation transition, STEM",

author = "Xingyu Feng and Shihao Zhang and Pengshuai Liu and Wenjun Kuang",

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doi = "10.1016/j.actamat.2023.119368",

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TY - JOUR

T1 - The structure dependence of grain boundary passivation of Alloy 690 in high temperature water

AU - Feng, Xingyu

AU - Zhang, Shihao

AU - Liu, Pengshuai

AU - Kuang, Wenjun

PY - 2023/12/1

Y1 - 2023/12/1

N2 - The oxidation behavior of grain boundaries (GBs) was investigated on Alloy 690 after exposure to simulated pressurized water reactor primary water. The tendency to form passive film above GB is positively related to Cr diffusivity along GB which is determined by GB structure. Highly-ordered GB like twin boundary is subject to penetrative oxidation as Cr diffusivity is very low. GBs with misorientation angle θ ≤17.4° can't support fast diffusion of Cr either and also show penetrative oxidation. When θ ranges between 17.4° and 28.7°, Cr diffusivity is enhanced a little and GB shows unstable passivation. Meanwhile, the Cr diffusivity along GB is also related to the atomic packing density of GB planes. GB with higher atom packing density exhibits lower Cr diffusivity and deeper intergranular oxide depth. As θ increases above 28.7°, Cr diffusion is fast enough to support the formation of protective film above GB.

AB - The oxidation behavior of grain boundaries (GBs) was investigated on Alloy 690 after exposure to simulated pressurized water reactor primary water. The tendency to form passive film above GB is positively related to Cr diffusivity along GB which is determined by GB structure. Highly-ordered GB like twin boundary is subject to penetrative oxidation as Cr diffusivity is very low. GBs with misorientation angle θ ≤17.4° can't support fast diffusion of Cr either and also show penetrative oxidation. When θ ranges between 17.4° and 28.7°, Cr diffusivity is enhanced a little and GB shows unstable passivation. Meanwhile, the Cr diffusivity along GB is also related to the atomic packing density of GB planes. GB with higher atom packing density exhibits lower Cr diffusivity and deeper intergranular oxide depth. As θ increases above 28.7°, Cr diffusion is fast enough to support the formation of protective film above GB.

KW - Alloy 690

KW - Grain boundary diffusion

KW - Grain boundary structure

KW - Internal/external oxidation transition

KW - STEM

UR - https://www.scopus.com/pages/publications/85173040817

U2 - 10.1016/j.actamat.2023.119368

DO - 10.1016/j.actamat.2023.119368

M3 - 文章

AN - SCOPUS:85173040817

SN - 1359-6454

VL - 261

JO - Acta Materialia

JF - Acta Materialia

M1 - 119368

ER -

The structure dependence of grain boundary passivation of Alloy 690 in high temperature water

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