Effect of overload on the oxidation behavior of CF8A austenitic stainless steel in a high-temperature water environment

Xu, Youwei; Jing, Hongyang; Xu, Lianyong; Han, Yongdian; Zhao, Lei

doi:10.1016/j.corsci.2019.108219

Cited by 7 publications

(4 citation statements)

References 49 publications

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“…However, the residual stress caused by welding, as well as thermal expansion and contraction caused by power changes due to nuclear power peak shaving, produces a large axial load on the heat exchange pipeline, triggering local plastic deformation. The areas experiencing plastic deformation become critical points in determining the service life of the components [20][21][22] . Plastic slip increases the activation energy of a metal matrix, thereby increasing the rate of corrosion.…”

Section: Introductionmentioning

confidence: 99%

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Zhang

et al. 2022

npj Mater Degrad

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The use of molten-salt–based energy production and storage systems requires high-temperature corrosion- and creep-resistant structural materials. This study investigated the microstructure evolution and corrosion characteristics of Hastelloy N under working stress in a molten salt environment. Selective diffusion of Cr at the grain boundaries (GBs) of the Hastelloy N degraded the properties of the GBs, making them preferred locations for corrosion crack invasion. Stress further promoted Cr diffusion and accelerated GB carbide precipitation, thereby forming a corrosion couple between the carbide and matrix that facilitated the expansion of intergranular corrosion cracks into the grains. These findings are useful for providing advances in the design of novel structural alloys with extraordinary property-microstructure stability combinations for resistant to complex molten salt environments.

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Section: Introductionmentioning

confidence: 99%

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Zhang

et al. 2022

npj Mater Degrad

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“…In addition, part of the Cr 2 O 3 can react easily with Fe to form FeCr 2 O 4 at 300 • C [47], which has high hardness and can be easily removed from the surface during the process of friction, thus greatly reducing the protective ability of the oxide layer [37,48]. With the plowing of Cr 2 O 3 , the transformation of Cr 2 O 3 to FeCr 2 O 4 and the long-term shear action of the friction couple, the layer was destroyed, which resulted in the exposure of the matrix and the formation of a large amount of wear debris on the surface of the wear track (Figure 4a) [37]. The HNSS matrix was ploughed by hard debris under the extrusion of the friction couple, forming some grooves parallel to the sliding direction on the surface.…”

Section: Discussionmentioning

confidence: 99%

“…The high-resolution XPS spectra of Fe 2p of the wear tracks under different conditions are shown in Figure 7. The element of Fe has two common oxidation states, ferrous (Fe 2+ ) and ferric (Fe 3+ ) [37], and the two oxidation states exist under all conditions. The binding energy (BE) of Fe 3+ (2p3/2) in Fe2O3 and Fe 2+ (2p3/2) in Fe3O4 was 711.6 eV and The high-resolution XPS spectra of Fe 2p of the wear tracks under different conditions are shown in Figure 7.…”

Section: Microstructure Characteristics Of the Wear Tracksmentioning

confidence: 99%

“…The binding energy (BE) of Fe 3+ (2p3/2) in Fe2O3 and Fe 2+ (2p3/2) in Fe3O4 was 711.6 eV and The high-resolution XPS spectra of Fe 2p of the wear tracks under different conditions are shown in Figure 7. The element of Fe has two common oxidation states, ferrous (Fe 2+ ) and ferric (Fe 3+ ) [37], and the two oxidation states exist under all conditions. The binding energy (BE) of Fe 3+ (2p3/2) in Fe 2 O 3 and Fe 2+ (2p3/2) in Fe 3 O 4 was 711.6 eV and 709.2 eV, respectively [38,39].…”

Section: Microstructure Characteristics Of the Wear Tracksmentioning

confidence: 99%

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Friction and Wear Behaviors of Fe-19Cr-15Mn-0.66N Steel at High Temperature

et al. 2021

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The friction and wear behaviors of Fe-19Cr-15Mn-0.66N steel were investigated under applied loads of 5 N and 15 N at the wear-testing temperatures of 300 °C and 500 °C using a ball-on-disc tribometer. The wear tracks were evaluated by scanning electron microscopy (SEM) and laser scanning confocal microscopy (LSCM) to reveal the variation in morphologies. Energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) were used to determine the components of oxide layers formed on wear surfaces. The results demonstrated that the oxide layers are favorable for obtaining a low friction coefficient under all conditions. The average friction coefficient decreased with increasing load at 300 °C, while it increased with the increase in applied load at 500 °C. At 300 °C, severe abrasive wear characterized by grooves resulted in a high friction coefficient with 5 N applied, whereas the formation of a denser oxide layer consisting of Cr2O3, FeCr2O4, Fe2O3, etc., and the increased hardness caused by work hardening led to a decrease in friction characterized by mild adhesive wear. At 500 °C, the transformation of Fe2O3 to the relatively softer Fe3O4 and the high production of lubricating Mn2O3 resulted in a minimum average friction coefficient (0.34) when 5 N was applied. However, the softening caused by high temperature weakened the hardening effect, and thus the friction coefficient increased with 15 N applied at 500 °C.

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Correlation between Corrosion Films and Corrosion-Related Defects Formed on 316 Stainless Steel at High Temperatures in Pressurized Water

Qiao

Chen

et al. 2021

J. of Materi Eng and Perform

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Effect of overload on the oxidation behavior of CF8A austenitic stainless steel in a high-temperature water environment

Cited by 7 publications

References 49 publications

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Friction and Wear Behaviors of Fe-19Cr-15Mn-0.66N Steel at High Temperature

Correlation between Corrosion Films and Corrosion-Related Defects Formed on 316 Stainless Steel at High Temperatures in Pressurized Water

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