The effects of σ phase on localized corrosion of 2205 duplex stainless steel in the presence of Pseudomonas aeruginosa

Zhu, Liyang; Wu, Jiajia; Wang, Peng; Zhang, Dun; Li, Ce; Gao, Yaohua; Wang, Wenkai

doi:10.1016/j.corsci.2024.112042

Cited by 5 publications

(2 citation statements)

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“…The results show that the second phases such as σ, χ, R, π, carbides, and nitrides are precipitated in DSS2205 material during isothermal aging at 300~1000 • C, which seriously affects the performance of dual-phase steel [6,8,[10][11][12]. From the results of this study, it can be seen that when tempering at 750 • C and above for 1 h, the ferrite content of dualphase steel gradually decreases with the increase in temperature, and the σ phase content gradually increases.…”

Section: Analysis and Discussionmentioning

confidence: 99%

“…When the ratio of two phases is close to 1:1, duplex stainless steel exhibits the best comprehensive performance [1][2][3]. After an improper heat treatment (such as sensitization), the two-phase ratio of dual-phase steel will change, and second phases such as σ, χ, carbides, and nitrides will inevitably precipitate at grain boundaries, phase boundaries, and in their vicinities [4][5][6], thus forming a Cr-depleted zone and leading to a certain intergranular corrosion sensitivity in a specific corrosion environment [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Tempering Temperature on Microstructure and Intergranular Corrosion Property of 2205 Duplex Stainless Steel

Luo,

Fang,

Zhang

et al. 2024

Coatings

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The effect of tempering temperature on the microstructure and intergranular corrosion property of 2205 duplex stainless steel (DSS2205) was determined using a boiling acid intergranular corrosion test (boiling 65% nitric acid and 50% sulfuric acid–ferric sulfate), an optical microscope, a transmission electron microscope, and a double-loop electrochemical potentiokinetic reactivation (DL-EPR) test. The results show that the ferrite content of the DSS2205 is about 50% in a specimen close to a solid solution state (1050 °C for 1 h, then water-quenched) when tempered at 675 °C–725 °C for 1 h. As the tempering temperature rises to 750 °C–800 °C for 1 h, the ferrite content drops gradually from 49% to 35%. M23C6, FeCr (σ phase), and Cr2N phases are precipitated when the specimen is tempered at 675°C–800 °C for 1 h. When the tempering temperature rises to 750 °C–800 °C for 1 h, the content and size of σ phase increase significantly. In the boiling acid intergranular corrosion test, when the specimen is tempered at 675 °C–725 °C for 1 h, the corrosion rate is higher than when it is tempered at 750 °C–800 °C for 1 h. In the DL-EPR test, when the specimen is tempered at 675 °C–800 °C for 1 h, the intergranular corrosion sensitivity rises gradually. External polarization is added during the DL-EPR test, and the test principle is different from that of the boiling acid intergranular corrosion test, resulting in a different sensitivity to intergranular corrosion compared to boiling acid intergranular corrosion.

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Section: Analysis and Discussionmentioning

confidence: 99%