The Mechanism on the B Addition to Regulate Phase Precipitation and Improve Intergranular Corrosion Resistance in UNS S31254 Superaustenitic Stainless Steels

Wang, Jian; Cui, Yan; Bai, Jingang; Dong, Nan; Liu, Ying; Zhang, Caili; Han, Peide

doi:10.1149/2.1361915jes

Cited by 17 publications

(2 citation statements)

References 42 publications

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“…The results indicate that the B addition inhibits the formation of σ phase. Besides, according to the reported results, [44] when no B was added to austenitic stainless steel, Cr-poor zone would form in the matrix of stainless steel. However, no depleted zone of Cr appears in our austenitic stainless steel samples containing B, which indicates that the Cr-depletion no longer exists in matrix and the adjacent area of GBs.…”

Section: B Effect On Gb Segregation Tendencies Of Momentioning

confidence: 91%

Effects of B segregation on Mo-rich phase precipitation in S31254 super-austenitic stainless steels: Experimental and first-principles study

Xu¹,

Ma²,

Zhang³

et al. 2022

Chinese Phys. B

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Precipitation in super-austenitic stainless steels will significantly affect their corrosion resistance and hot workability. The effects of Cr and Mo on precipitation behaviors were mainly achieved by affecting the driving force for precipitation, especially Mo has a more substantial promotion effect on the formation of the σ phase than Cr. In the present study, B addition to the S31254 super-austenitic stainless steels shows an excellent ability to inhibit precipitation. The effect of B on the precipitation behaviors was investigated by microstructure characterization and theoretical calculations. The experimental observation shows that the small addition of B inhibits the formation of the σ phase along grain boundaries and changes from continuous to intermittent distribution. Moreover, the inhibitory effect increased obviously with the increase of B content. The influence of B addition was theoretically analyzed from the atomic level, and the calculation results demonstrate that B can inhibit the formation of σ phase precipitates by suppressing Mo migration to grain boundaries. It is found that B and Mo are inclined to segregate at Σ5 and Σ9 grain boundaries, with B showing the most severe grain boundary segregation tendency. While B distribution at the grain boundary before precipitation begins, the segregation of Mo and Cr will be restrained. Additionally, B’s occupation will induce a high potential barrier, making it difficult for Mo to diffuse towards grain boundaries.

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Section: B Effect On Gb Segregation Tendencies Of Momentioning

confidence: 91%

Effects of B segregation on Mo-rich phase precipitation in S31254 super-austenitic stainless steels: Experimental and first-principles study

Xu¹,

Ma²,

Zhang³

et al. 2022

Chinese Phys. B

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“…To improve the service life of austenitic heat-resistant steels, it is crucial to find ways to restrain the precipitation of Cr 23 C 6 carbides or slow down their coarsening speed. B, often referred to as a "vitamin" in steels [8][9][10][11], has extremely low solubility with concentrations typically in the range of several tens of ppm. In steels, B primarily distributes at or near GBs.…”

Section: Introductionmentioning

confidence: 99%

The Effect of B on the Co-Segregation of C-Cr at Grain Boundaries in Austenitic Steels

Yan

Han

et al. 2023

Metals

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In austenitic steels, the co-segregation of C and Cr at grain boundaries can result in the formation of Cr23C6. However, the addition of B to steels can effectively reduce the amount of Cr23C6 formed and inhibit its ripening in experiments, simultaneously transforming it into Cr23(BC)6. Therefore, the effect of B on the co-segregation of C and Cr at the Σ5(210), Σ9(221) and Σ11(113) grain boundaries in austenitic steels was investigated using density functional theory. The results indicate that B, C, and Cr all tend to segregate at the three grain boundaries, with B and C showing a stronger segregation tendency. Furthermore, co-segregation of C and Cr with short distances occurs readily at the Σ5(210), Σ9(221) and Σ11(113) grain boundaries. The presence of B at grain boundaries can impede the segregation of Cr, particularly at the Σ9(221) and Σ11(113) grain boundaries. When B is pre-segregating at the Σ5(210) grain boundary, B, C, and Cr tend to co-segregate at the grain boundary. The grain boundary B hinders the accumulation of Cr near it for most grain boundaries, thereby inhibiting the co-segregation of Cr and C, making it difficult for B, C, and Cr to aggregate at most grain boundaries. This is beneficial for controlling the nucleation of Cr23(BC)6.

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Effect of Boron on Stress Corrosion Resistance of S31254 Super‐Austenitic Stainless Steel After Cold Deformation

Xiao,

Liang,

Cao

et al. 2024

steel research int.

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The effect of boron (B) on stress corrosion resistance of S31254 in the presence of residual stresses has been studied. The microstructure and corrosion resistance of S31254 containing B at different levels of cold deformation are analyzed in this study. In the results, it is shown that B favors the improvement of deformation uniformity of S31254. The grain boundary (GB) and slip bands have better corrosion resistance at 5% deformation, and the overall corrosion resistance is better than that of the undeformed state, with smaller passivation current density and narrower width of GB corrosion grooves, especially for the 40B samples. At 30% deformation, the overall corrosion resistance of 40B S31254 is better than 0B due to improved deformation uniformity.

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The Mechanism on the B Addition to Regulate Phase Precipitation and Improve Intergranular Corrosion Resistance in UNS S31254 Superaustenitic Stainless Steels

Cited by 17 publications

References 42 publications

Effects of B segregation on Mo-rich phase precipitation in S31254 super-austenitic stainless steels: Experimental and first-principles study

Effects of B segregation on Mo-rich phase precipitation in S31254 super-austenitic stainless steels: Experimental and first-principles study

The Effect of B on the Co-Segregation of C-Cr at Grain Boundaries in Austenitic Steels

Effect of Boron on Stress Corrosion Resistance of S31254 Super‐Austenitic Stainless Steel After Cold Deformation

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