Grain boundary oxidation behavior of Ni15Cr alloy in high temperature carbon dioxide

Liujie Yang; Xingyu Feng; Jiayu Xie; Hongchen Qian; Xianchao Hao; Wenjun Kuang

doi:10.1016/j.scriptamat.2022.114935

Grain boundary oxidation behavior of Ni15Cr alloy in high temperature carbon dioxide

Liujie Yang
, Xingyu Feng
, Jiayu Xie
, Hongchen Qian
, Xianchao Hao
, Wenjun Kuang

School of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

The grain boundary (GB) corrosion behavior of Ni15Cr alloy in 650℃/1bar CO₂ gas was investigated. The oxidation behavior of coherent twin boundary is similar to that of grain matrix due to the immobility of Cr. However, the incoherent twin boundary is prone to preferential intergranular oxidation due to the limited Cr diffusivity and the ingress of oxygen. Likewise, low angle GB is also susceptible to intergranular oxidation because Cr diffusion is not fast enough although it can induce GB migration and result in a protective scale at oxide tip. In contrast, random high angle GB is immune to intergranular oxidation because Cr can diffuse quickly to form a protective scale above GB with the formation of a large GB migration zone. Therefore, the oxidation behavior of GB is closely related to the diffusivity of Cr along GB which is determined by the GB structure.

Original language	English
Article number	114935
Journal	Scripta Materialia
Volume	220
DOIs	https://doi.org/10.1016/j.scriptamat.2022.114935
State	Published - Nov 2022

Keywords

Grain boundary diffusion
Grain boundary migration
Grain boundary structure
Nickel alloy
Scanning electron microscopy (SEM)

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10.1016/j.scriptamat.2022.114935

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title = "Grain boundary oxidation behavior of Ni15Cr alloy in high temperature carbon dioxide",

abstract = "The grain boundary (GB) corrosion behavior of Ni15Cr alloy in 650℃/1bar CO2 gas was investigated. The oxidation behavior of coherent twin boundary is similar to that of grain matrix due to the immobility of Cr. However, the incoherent twin boundary is prone to preferential intergranular oxidation due to the limited Cr diffusivity and the ingress of oxygen. Likewise, low angle GB is also susceptible to intergranular oxidation because Cr diffusion is not fast enough although it can induce GB migration and result in a protective scale at oxide tip. In contrast, random high angle GB is immune to intergranular oxidation because Cr can diffuse quickly to form a protective scale above GB with the formation of a large GB migration zone. Therefore, the oxidation behavior of GB is closely related to the diffusivity of Cr along GB which is determined by the GB structure.",

keywords = "Grain boundary diffusion, Grain boundary migration, Grain boundary structure, Nickel alloy, Scanning electron microscopy (SEM)",

author = "Liujie Yang and Xingyu Feng and Jiayu Xie and Hongchen Qian and Xianchao Hao and Wenjun Kuang",

note = "Publisher Copyright: {\textcopyright} 2022",

year = "2022",

month = nov,

doi = "10.1016/j.scriptamat.2022.114935",

language = "英语",

volume = "220",

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TY - JOUR

T1 - Grain boundary oxidation behavior of Ni15Cr alloy in high temperature carbon dioxide

AU - Yang, Liujie

AU - Feng, Xingyu

AU - Xie, Jiayu

AU - Qian, Hongchen

AU - Hao, Xianchao

AU - Kuang, Wenjun

PY - 2022/11

Y1 - 2022/11

N2 - The grain boundary (GB) corrosion behavior of Ni15Cr alloy in 650℃/1bar CO2 gas was investigated. The oxidation behavior of coherent twin boundary is similar to that of grain matrix due to the immobility of Cr. However, the incoherent twin boundary is prone to preferential intergranular oxidation due to the limited Cr diffusivity and the ingress of oxygen. Likewise, low angle GB is also susceptible to intergranular oxidation because Cr diffusion is not fast enough although it can induce GB migration and result in a protective scale at oxide tip. In contrast, random high angle GB is immune to intergranular oxidation because Cr can diffuse quickly to form a protective scale above GB with the formation of a large GB migration zone. Therefore, the oxidation behavior of GB is closely related to the diffusivity of Cr along GB which is determined by the GB structure.

AB - The grain boundary (GB) corrosion behavior of Ni15Cr alloy in 650℃/1bar CO2 gas was investigated. The oxidation behavior of coherent twin boundary is similar to that of grain matrix due to the immobility of Cr. However, the incoherent twin boundary is prone to preferential intergranular oxidation due to the limited Cr diffusivity and the ingress of oxygen. Likewise, low angle GB is also susceptible to intergranular oxidation because Cr diffusion is not fast enough although it can induce GB migration and result in a protective scale at oxide tip. In contrast, random high angle GB is immune to intergranular oxidation because Cr can diffuse quickly to form a protective scale above GB with the formation of a large GB migration zone. Therefore, the oxidation behavior of GB is closely related to the diffusivity of Cr along GB which is determined by the GB structure.

KW - Grain boundary diffusion

KW - Grain boundary migration

KW - Grain boundary structure

KW - Nickel alloy

KW - Scanning electron microscopy (SEM)

UR - https://www.scopus.com/pages/publications/85134656782

U2 - 10.1016/j.scriptamat.2022.114935

DO - 10.1016/j.scriptamat.2022.114935

M3 - 文章

AN - SCOPUS:85134656782

SN - 1359-6462

VL - 220

JO - Scripta Materialia

JF - Scripta Materialia

M1 - 114935

ER -

Grain boundary oxidation behavior of Ni15Cr alloy in high temperature carbon dioxide

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Keywords

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