Understanding the relation between pitting corrosion resistance and phase fraction of S32101 duplex stainless steel

Ha, Heung Yong; Lee, Tae‐Ho; Lee, Chang-Geun; Yoon, Hanme

doi:10.1016/j.corsci.2019.01.001

Cited by 59 publications

(34 citation statements)

References 39 publications

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“…For the LOM and SEM analyses, the specimens (10 mm × 10 mm × 2 mm) were mechanically polished using suspension containing 1 µm-sized diamond particles. The polished specimens were chemically etched in a mixed acid solution (20 mL HNO 3 + 30 mL HCl + 50 mL deionized water) for 1-3 min [33,35,37,38], which allowed us to measure the phase fractions (α:γ) of the specimens. Then we electrochemically etched in a 40% HNO 3 solution by applying 4.5 V for 20-30 s [39,40] in order to identify the grain boundaries.…”

Section: Methodsmentioning

confidence: 99%

“…Individual chemical compositions of the α and γ phases of the DSSs were measured using the EPMA and they were indicated in ( Figure 5). The α phases of both DSSs contained only 0.05 wt% N (Figure 5a), which was the solubility limit of N in the α phase [38,[41][42][43]. Most of the alloyed N was concentrated in the γ phase, whose concentration was 0.40 wt% for the DSS-N and 0.26 wt% for the DSS-NC (Figure 5a).…”

Section: Partitioning Of Alloying Elementsmentioning

confidence: 99%

“…The dissolution rate of the dual-phase matrix is related to the galvanic corrosion rate between the two constituent phases. Thus, for the DSSs, the galvanic corrosion rate was quantified by measuring the corrosion depth between the α and γ phases [38,43,46]. The polished DSS specimens were immersed in the 0.2 M HCl solution and the corrosion surface was examined using a surface profiler.…”

Section: Galvanic Corrosion Between the Two Constituent Phasesmentioning

confidence: 99%

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Pitting Corrosion Resistance and Repassivation Behavior of C-Bearing Duplex Stainless Steel

Yoon

Lee

et al. 2019

Metals

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The effects of C-substitution for part of the N content, on the pitting corrosion resistance and repassivation tendencies of duplex stainless steels (DSSs) were investigated. For this investigation, normal UNS S32205 containing N only (DSS-N) and the C-substituted DSS (DSS-NC) were fabricated. Microstructural analyses confirmed that the two DSSs had dual-phase microstructures without precipitates, and they possessed similar initial microstructure, including their grain sizes and phase fractions. Polarization and immersion tests performed in concentrated chloride solutions revealed that the DSS-NC was more resistant against stable pitting corrosion and possessed a higher repassivation tendency than the DSS-N. Furthermore, the corrosion pits initiated and propagated to a less corrosion resistant α phase. Polarization tests and corrosion depth measurements conducted in an HCl solution indicated that the DSS-NC exhibited lower galvanic corrosion rate between the α and γ phases than the DSS-N. Therefore, the growth rate of pit embryo was lowered in the DSS-NC, which shifted the potentials for the stable pit initiation and the pit extinction to the higher values.

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Section: Methodsmentioning

confidence: 99%

Section: Partitioning Of Alloying Elementsmentioning

confidence: 99%

Section: Galvanic Corrosion Between the Two Constituent Phasesmentioning

confidence: 99%

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Pitting Corrosion Resistance and Repassivation Behavior of C-Bearing Duplex Stainless Steel

Yoon

Lee

et al. 2019

Metals

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“…[ 9–13 ] According to the pitting resistance equivalent (PRE = Cr + 3.3% Mo + 16% N), [ 4,6,9,16–18 ] the partitioning of the alloying elements results in the difference of corrosion resistance of each phase. In addition, several works [ 4,9,10 ] indicated that partitioning of alloying elements in each phase was affected by annealing temperature. Ha [ 4 ] and Deng [ 9 ] reported that the contents of Cr and Mo in the ferrite phase gradually decreased with increasing annealing temperature, whereas those in the austenite phase slightly increased.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ferrite Proportion and Precipitates on Dual‐Phase Corrosion of S32750 Super Duplex Stainless Steel with Different Annealing Temperatures

Shen

Wang

Yang

et al. 2021

steel research int.

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The effects of ferrite proportion and precipitates on the dual‐phase corrosion properties of S32750 super duplex stainless steel are investigated with different annealing temperatures. When the specimens are annealed at 900 and 950 °C, respectively, the dual‐phase microstructure changes due to the precipitation of σ phase. Meanwhile, the passivation behavior of the specimens weakens, and the pitting corrosion potential decreases. With the increase in annealing temperature, especially over 1150 °C, the ferrite content and the grain size increase significantly and the pitting resistance equivalent of the ferrite phase decreases. The optimal annealing temperature of the tested steel is 1050–1100 °C. Under this condition, the dual‐phase proportion is close to 1:1, no obvious secondary phase precipitates in the matrix, and both the ferrite and the austenite phases present excellent corrosion resistances.

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“…The annealing treatment process significantly affects the corrosion resistance of DSS, which is closely related with its microstructure and especially the equilibrium partition of the alloy elements in two phases [7][8][9][10][11][12]. Generally, the pitting resistance equivalent number (PREN) is used to estimate the pitting corrosion resistance of stainless steel; the overall pitting corrosion resistance is determined by the phase with the lower PREN value and the difference in the PREN values in each phase [13][14][15]. Tan et al investigated the pitting corrosion resistance of commercial super duplex stainless steels (UNS S32750) annealed at 1030-1200 • C. They found that the PREN curves of ferrite and austenite in S32750 intersect at 1080 • C, and S32750 stainless steel annealed at 1080 • C exhibits the best pitting corrosion resistance [16].…”

Section: Introductionmentioning

confidence: 99%

Pitting Corrosion Resistance on Annealing Treated Super Duplex Stainless Steel S32750

et al. 2020

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The pitting corrosion resistance of S32750 super duplex stainless steel, annealing treated at temperatures of 950–1200 °C for 20–60 min, was investigated using potentiodynamic polarization tests. The results show that the volume fractions of ferrite in the S32750 duplex stainless steel increased from 48.9% to 68.4% as annealing temperatures increased from 950 to 1200 °C. The pitting potential of the sample increased first and then decreased from an annealing temperature of 950 to 1050 °C, and the highest pitting potential was observed after annealing at 1050 °C for 35 min. The pitting corrosion resistance of S32750 stainless steel is due to the combination of pitting resistance equivalent number (PREN) value, phase fraction and grain boundary area fraction, and the imbalance of corrosion potential.

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Understanding the relation between pitting corrosion resistance and phase fraction of S32101 duplex stainless steel

Cited by 59 publications

References 39 publications

Pitting Corrosion Resistance and Repassivation Behavior of C-Bearing Duplex Stainless Steel

Pitting Corrosion Resistance and Repassivation Behavior of C-Bearing Duplex Stainless Steel

Effect of Ferrite Proportion and Precipitates on Dual‐Phase Corrosion of S32750 Super Duplex Stainless Steel with Different Annealing Temperatures

Pitting Corrosion Resistance on Annealing Treated Super Duplex Stainless Steel S32750

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