Si-rich phases and their distributions in the oxide scale formed on 304 stainless steel at high temperatures

Lichun Zheng; Kazuya Hosoi; Shigeru Ueda; Xu Gao; Shin ya Kitamura; Yoshinao Kobayashi

doi:10.1016/j.jnucmat.2018.05.018

Si-rich phases and their distributions in the oxide scale formed on 304 stainless steel at high temperatures

Lichun Zheng, Kazuya Hosoi, Shigeru Ueda, Xu Gao, Shin ya Kitamura, Yoshinao Kobayashi

Center for Mineral Processing and Metallurgy (CMPM)

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

9 Citations (Scopus)

Abstract

Si-rich phases and their distributions in the oxide scale formed on 304 stainless steel (304SS) kinetically affects SiO₂ volatilization for the formation of silicate-based Cs-bearing microparticles released during the Fukushima Daiichi Nuclear Power Plant accident. Therefore, we investigated Si-rich phases and their distributions in the oxide scale on 304SS oxidized in H₂O–H₂ mixtures over the temperature range 1000–1300 °C. SiO₂ film stays at the base of the Cr₂O₃-type scale formed at low temperatures or high H₂ contents in steam. Fe₂SiO₂ phase is non-uniformly distributed in the spinel-type scale formed under opposite conditions. Fe₂SiO₂ accumulation in the spinel-type scale is attributed to its thermodynamically metastable state in H₂O–H₂ mixtures. With increasing oxidation time, Fe₂SiO₂ phase was further oxidized into SiO₂ phase.

Original language	English
Pages (from-to)	327-338
Number of pages	12
Journal	Journal of Nuclear Materials
Volume	507
DOIs	https://doi.org/10.1016/j.jnucmat.2018.05.018
Publication status	Published - 2018 Aug 15

Keywords

304 stainless steel
FeSiO
High temperatures
Oxidation
Si distribution
SiO

ASJC Scopus subject areas

Nuclear and High Energy Physics
Materials Science(all)
Nuclear Energy and Engineering

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title = "Si-rich phases and their distributions in the oxide scale formed on 304 stainless steel at high temperatures",

abstract = "Si-rich phases and their distributions in the oxide scale formed on 304 stainless steel (304SS) kinetically affects SiO2 volatilization for the formation of silicate-based Cs-bearing microparticles released during the Fukushima Daiichi Nuclear Power Plant accident. Therefore, we investigated Si-rich phases and their distributions in the oxide scale on 304SS oxidized in H2O–H2 mixtures over the temperature range 1000–1300 °C. SiO2 film stays at the base of the Cr2O3-type scale formed at low temperatures or high H2 contents in steam. Fe2SiO2 phase is non-uniformly distributed in the spinel-type scale formed under opposite conditions. Fe2SiO2 accumulation in the spinel-type scale is attributed to its thermodynamically metastable state in H2O–H2 mixtures. With increasing oxidation time, Fe2SiO2 phase was further oxidized into SiO2 phase.",

keywords = "304 stainless steel, FeSiO, High temperatures, Oxidation, Si distribution, SiO",

author = "Lichun Zheng and Kazuya Hosoi and Shigeru Ueda and Xu Gao and Kitamura, {Shin ya} and Yoshinao Kobayashi",

year = "2018",

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doi = "10.1016/j.jnucmat.2018.05.018",

language = "English",

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journal = "Journal of Nuclear Materials",

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T1 - Si-rich phases and their distributions in the oxide scale formed on 304 stainless steel at high temperatures

AU - Zheng, Lichun

AU - Hosoi, Kazuya

AU - Ueda, Shigeru

AU - Gao, Xu

AU - Kitamura, Shin ya

AU - Kobayashi, Yoshinao

PY - 2018/8/15

Y1 - 2018/8/15

N2 - Si-rich phases and their distributions in the oxide scale formed on 304 stainless steel (304SS) kinetically affects SiO2 volatilization for the formation of silicate-based Cs-bearing microparticles released during the Fukushima Daiichi Nuclear Power Plant accident. Therefore, we investigated Si-rich phases and their distributions in the oxide scale on 304SS oxidized in H2O–H2 mixtures over the temperature range 1000–1300 °C. SiO2 film stays at the base of the Cr2O3-type scale formed at low temperatures or high H2 contents in steam. Fe2SiO2 phase is non-uniformly distributed in the spinel-type scale formed under opposite conditions. Fe2SiO2 accumulation in the spinel-type scale is attributed to its thermodynamically metastable state in H2O–H2 mixtures. With increasing oxidation time, Fe2SiO2 phase was further oxidized into SiO2 phase.

AB - Si-rich phases and their distributions in the oxide scale formed on 304 stainless steel (304SS) kinetically affects SiO2 volatilization for the formation of silicate-based Cs-bearing microparticles released during the Fukushima Daiichi Nuclear Power Plant accident. Therefore, we investigated Si-rich phases and their distributions in the oxide scale on 304SS oxidized in H2O–H2 mixtures over the temperature range 1000–1300 °C. SiO2 film stays at the base of the Cr2O3-type scale formed at low temperatures or high H2 contents in steam. Fe2SiO2 phase is non-uniformly distributed in the spinel-type scale formed under opposite conditions. Fe2SiO2 accumulation in the spinel-type scale is attributed to its thermodynamically metastable state in H2O–H2 mixtures. With increasing oxidation time, Fe2SiO2 phase was further oxidized into SiO2 phase.

KW - 304 stainless steel

KW - FeSiO

KW - High temperatures

KW - Oxidation

KW - Si distribution

KW - SiO

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DO - 10.1016/j.jnucmat.2018.05.018

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VL - 507

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EP - 338

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

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