Effects of constant load on corrosion cracking of 304 ASS at 600°C in molten salts

Heng Li; Xinyu Yang; Xuzhong Yin; Jianqun Tang; Jianming Gong; Chengming Fuyang

doi:10.1002/maco.201911369

Effects of constant load on corrosion cracking of 304 ASS at 600°C in molten salts

Heng Li, Xinyu Yang, Xuzhong Yin, Jianqun Tang, Jianming Gong, Chengming Fuyang

School of Mechanical and Power Engineering

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

9 Scopus citations

Abstract

The effects of constant load (CL) on corrosion cracking of 304 austenitic stainless steel (ASS) in molten salts (binary nitrate salts, 60 wt% NaNO₃, and 40 wt% KNO₃) were investigated. A pair of novel clamping fixture was designed to fix the tensile sample, making the gauge section immersed in molten salts. The CL tensile tests were applied with the initial stress of 212 MPa and the temperature of 600°C. Optical microscopy, scanning electron microscopy, and energy dispersive spectroscopy were employed to characterize the deformation behavior and corrosion features. The results show that corrosion of 304 ASS in molten salts was aggravated by the continuous deformation due to the cracking of protective oxide scale. Grain boundaries were oxidized and weakened by the molten salt, leading to a crack propagating. Compared with the creep test result, a reduced rupture life of 304 ASS under constant loading in molten salts was observed.

Original language	English
Pages (from-to)	938-948
Number of pages	11
Journal	Materials and Corrosion
Volume	71
Issue number	6
DOIs	https://doi.org/10.1002/maco.201911369
State	Published - 1 Jun 2020

Keywords

304 ASS
binary nitrate salts
constant load
corrosion
corrosion cracking

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10.1002/maco.201911369

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title = "Effects of constant load on corrosion cracking of 304 ASS at 600°C in molten salts",

abstract = "The effects of constant load (CL) on corrosion cracking of 304 austenitic stainless steel (ASS) in molten salts (binary nitrate salts, 60 wt% NaNO3, and 40 wt% KNO3) were investigated. A pair of novel clamping fixture was designed to fix the tensile sample, making the gauge section immersed in molten salts. The CL tensile tests were applied with the initial stress of 212 MPa and the temperature of 600°C. Optical microscopy, scanning electron microscopy, and energy dispersive spectroscopy were employed to characterize the deformation behavior and corrosion features. The results show that corrosion of 304 ASS in molten salts was aggravated by the continuous deformation due to the cracking of protective oxide scale. Grain boundaries were oxidized and weakened by the molten salt, leading to a crack propagating. Compared with the creep test result, a reduced rupture life of 304 ASS under constant loading in molten salts was observed.",

keywords = "304 ASS, binary nitrate salts, constant load, corrosion, corrosion cracking",

author = "Heng Li and Xinyu Yang and Xuzhong Yin and Jianqun Tang and Jianming Gong and Chengming Fuyang",

note = "Publisher Copyright: {\textcopyright} 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

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doi = "10.1002/maco.201911369",

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T1 - Effects of constant load on corrosion cracking of 304 ASS at 600°C in molten salts

AU - Li, Heng

AU - Yang, Xinyu

AU - Yin, Xuzhong

AU - Tang, Jianqun

AU - Gong, Jianming

AU - Fuyang, Chengming

PY - 2020/6/1

Y1 - 2020/6/1

N2 - The effects of constant load (CL) on corrosion cracking of 304 austenitic stainless steel (ASS) in molten salts (binary nitrate salts, 60 wt% NaNO3, and 40 wt% KNO3) were investigated. A pair of novel clamping fixture was designed to fix the tensile sample, making the gauge section immersed in molten salts. The CL tensile tests were applied with the initial stress of 212 MPa and the temperature of 600°C. Optical microscopy, scanning electron microscopy, and energy dispersive spectroscopy were employed to characterize the deformation behavior and corrosion features. The results show that corrosion of 304 ASS in molten salts was aggravated by the continuous deformation due to the cracking of protective oxide scale. Grain boundaries were oxidized and weakened by the molten salt, leading to a crack propagating. Compared with the creep test result, a reduced rupture life of 304 ASS under constant loading in molten salts was observed.

AB - The effects of constant load (CL) on corrosion cracking of 304 austenitic stainless steel (ASS) in molten salts (binary nitrate salts, 60 wt% NaNO3, and 40 wt% KNO3) were investigated. A pair of novel clamping fixture was designed to fix the tensile sample, making the gauge section immersed in molten salts. The CL tensile tests were applied with the initial stress of 212 MPa and the temperature of 600°C. Optical microscopy, scanning electron microscopy, and energy dispersive spectroscopy were employed to characterize the deformation behavior and corrosion features. The results show that corrosion of 304 ASS in molten salts was aggravated by the continuous deformation due to the cracking of protective oxide scale. Grain boundaries were oxidized and weakened by the molten salt, leading to a crack propagating. Compared with the creep test result, a reduced rupture life of 304 ASS under constant loading in molten salts was observed.

KW - 304 ASS

KW - binary nitrate salts

KW - constant load

KW - corrosion

KW - corrosion cracking

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DO - 10.1002/maco.201911369

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JO - Materials and Corrosion

JF - Materials and Corrosion

IS - 6

ER -

Effects of constant load on corrosion cracking of 304 ASS at 600°C in molten salts

Abstract

Keywords

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