Corrosion of Fe-9%Cr-1%Mo Steel at 600 and 700℃ in N<sub>2</sub>/(0.5, 2.5)%H<sub>2</sub>S-mixed Gas

Lee, Dong Bok; Abro, Muhammad Ali; Yadav, Poonam; Bak, Sang Hwan; Shi, Yanbin; Kim, Min Jung

doi:10.5695/jkise.2016.49.2.147

Cited by 2 publications

(1 citation statement)

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“…Lee at al. [3,4] conducted a study on surface corrosion behaviors of T23 and T91 steels at N 2 + H 2 S gas and atmospheric environments. Pandey et al [5] conducted a study on creep resistance of cast-forged P91 steel at 620-650 • C and 120-200 MPa conditions.…”

Section: Introductionmentioning

confidence: 99%

Degradation Characteristics of Microstructure and Mechanical Properties for 9Cr-1MoVNb Steel aged under High-Temperature

Jung

Kim

2019

Acta Phys. Pol. A

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Thermal aging was conducted at 650 • C until 1,000 h under the atmospheric environment to evaluate the degradation characteristics of microstructure and mechanical properties of 9Cr-1MoVNb steel. The analysis of the microstructure and carbide of aged specimens was conducted by scanning electron microscopy and energy dispersive X-ray spectroscopy. The mechanical properties were evaluated by tensile and Vickers hardness tests. In addition, fractured tensile specimens were characterized by using scanning electron microscopy and energy dispersive X-ray spectroscopy to observe the changes in fracture mode with aging time. As a result, loss of martensite lath, coarsening of M23C6 carbide, and precipitation of Laves phase were observed after aging for 100 h. Degradation leads to deterioration in mechanical properties due to the effect of the nucleation and coarsening of Cr-rich M23C6 carbide. However, the change in fracture mode was more affected by the Laves phase (Fe2Mo) than the M23C6.

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Section: Introductionmentioning

confidence: 99%

Degradation Characteristics of Microstructure and Mechanical Properties for 9Cr-1MoVNb Steel aged under High-Temperature

Jung

Kim

2019

Acta Phys. Pol. A

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Corrosion of Hot-dip Aluminized 9Cr-1Mo Steel in N2/0.1%H2S Gas

Abro¹,

Hahn²,

Lee³

2019

Korean J. Met. Mater.

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ASTM P91 steel (viz. 9Cr-1Mo steel) was hot-dip aluminized to form a ~70 µm thick coating, and was then corroded in N 2 /0.1%H 2 S gas for 50 h at 800 and 900 ºC, to study the effect of aluminizing on the corrosion resistance of P91 steel in highly corrosive H 2 S environments. Before corrosion, the aluminized coating consisted of an Al-rich topcoat, an Al 13 Fe 4 upper layer, and an Al 5 Fe 2 lower layer from the surface. During corrosion, Al, oxygen, and sulfur diffused inwardly, while substrate elements diffused outwardly. Impurity oxygen in the gas reacted preferentially with Al to form α-Al 2 O 3 at the surface, which increased the corrosion resistance significantly. Bare P91 steel corroded quickly, to form bi-layered, fragile, nonprotective FeS scales. The coating transformed into either a (Al 13 Fe 4 , Al 5 Fe 2 )-mixed layer, AlFe layer, AlFe 3 layer, and α-Fe(Al) layer when corroded at 800 ºC/50 h, or into a AlFe 3 layer and α-Fe(Al) layer when corroded at 900 ºC/ 50 h. Interdiffusion that occurred during corrosion increased the total coating thickness, and transformed (high Al)-Fe phases to (low Al)-Fe phases. The corrosion accompanied the formation of voids and microcracks in the coating.

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Corrosion of Fe-9%Cr-1%Mo Steel at 600 and 700℃ in N₂/(0.5, 2.5)%H₂S-mixed Gas

Cited by 2 publications

References 22 publications

Degradation Characteristics of Microstructure and Mechanical Properties for 9Cr-1MoVNb Steel aged under High-Temperature

Degradation Characteristics of Microstructure and Mechanical Properties for 9Cr-1MoVNb Steel aged under High-Temperature

Corrosion of Hot-dip Aluminized 9Cr-1Mo Steel in N2/0.1%H2S Gas

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Corrosion of Fe-9%Cr-1%Mo Steel at 600 and 700℃ in N2/(0.5, 2.5)%H2S-mixed Gas

Cited by 2 publications

References 22 publications

Degradation Characteristics of Microstructure and Mechanical Properties for 9Cr-1MoVNb Steel aged under High-Temperature

Degradation Characteristics of Microstructure and Mechanical Properties for 9Cr-1MoVNb Steel aged under High-Temperature

Corrosion of Hot-dip Aluminized 9Cr-1Mo Steel in N2/0.1%H2S Gas

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Corrosion of Fe-9%Cr-1%Mo Steel at 600 and 700℃ in N₂/(0.5, 2.5)%H₂S-mixed Gas