Effects of the precipitation of secondary phases on the erosion-corrosion of 25% Cr duplex stainless steel

Kim, Young-Jae; Kim, Suwon; Kim, Han-Byeol; Choi, Yun-Il; Park, Chan‐Jin

doi:10.1016/j.corsci.2019.03.006

Cited by 28 publications

(6 citation statements)

References 47 publications

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“…When the specimen is solution-treated at 1040 °C, a large amount of σ phase precipitates along the α- and γ-phase interface. Although the difference between the PREN values of the α and γ phase is not the largest, related reports [ 15 , 16 , 17 ] have shown that pitting corrosion tends to occur around the Cr-depleted zone due to the precipitation of σ phase. Therefore, pits tend to develop along the depth of this area, and further expand due to selective corrosion, resulting in worse corrosion resistance.…”

Section: Resultsmentioning

confidence: 91%

“…However, the incorporation of a higher content of Cr, Ni, Mo, and nitrogen elements brings excellent strength and corrosion resistance, but increases the risk of precipitation of secondary phases, such as the σ phase in the ternary Fe-Cr-Mo system, χ phase in the quaternary Fe-Cr-Ni-Mo system, and non-equilibrium nitrides [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. Once precipitated, it can significantly deteriorate the mechanical properties of the alloy as well as the corrosion resistance under harsh conditions [ 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Secondary-Phase Precipitation on Mechanical Properties and Corrosion Resistance of 00Cr27Ni7Mo5N Hyper-Duplex Stainless Steel during Solution Treatment

Wang

et al. 2022

Materials

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In this work, the effect of secondary-phase precipitation on the microstructure, mechanical properties, and corrosion resistance of 00Cr27Ni7Mo5N hyper-duplex stainless steel (HDSS) during solution treatment was investigated. The results reveal that σ-phase precipitates at the interface between the α and γ phase when the solution treatment temperature is lower than 1070 °C. It is not only brittle, but also prone to create a Cr-depleted zone, which significantly deteriorates the mechanical properties and corrosion resistance. With the increase in the solution treatment temperature, the volume fraction of ferrite gradually increases. The yield strength and tensile strength increase slightly, but the elongation decreases. At the same time, the impact toughness shows a trend of first increasing and then decreasing. When the solution treatment temperature is higher than 1130 °C, Cr2N precipitates in the ferrite. The precipitation of Cr2N causes a decrease in the plastic toughness, but it does not deteriorate the mechanical properties as significantly as the σ phase. However, it can also cause the formation of a Cr-depleted zone that significantly decreases the corrosion resistance. There is no secondary-phase precipitation in the sample after solution treatment at 1100 °C, which shows the best mechanical properties and corrosion resistance.

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Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Effect of Secondary-Phase Precipitation on Mechanical Properties and Corrosion Resistance of 00Cr27Ni7Mo5N Hyper-Duplex Stainless Steel during Solution Treatment

Wang

et al. 2022

Materials

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“…The grain sizes of WC10Co4Cr‐6%Al 2 O 3 ‐3%La 2 O 3 , −6%La 2 O 3 , and −9%La 2 O 3 coatings were 4.23, 3.81, and 3.02 μm, respectively. This was because the La 2 O 3 was easily gathered at the grain boundaries, dislocations, and other defects to result in pinning or dragging effect, 25 which hindered the growth of grains to refine the coating structure.…”

Section: Results Analysis and Discussionmentioning

confidence: 99%

Effects on Al₂O₃ and La₂O₃ additions on electrochemical performances of laser‐cladded WC10Co4Cr coatings

Shi

Dejun

2021

Int J Applied Ceramic Tech

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Al 2 O 3 and La 2 O 3 -reinforced WC10Co4Cr coatings were fabricated on Cr12MoV steel by laser cladding (LC). The microstructure and phases of obtained coatings were analyzed using a digital microscopic system (DMS) and X-ray diffraction (XRD), respectively. The effects of Al 2 O 3 and La 2 O 3 mass fractions on the electrochemical corrosion performances of WC10Co4Cr coatings in 3.5% NaCl solution were investigated on an electrochemical workstation. The results show that the WC10Co4Cr with the different Al 2 O 3 mass fractions are composed of Co 4 W 2 C, WC, Al 2 O 3 , W 2 C, and Fe-Cr phases, and the La 2 O 3 -reinforced WC10Co4Cr-Al 2 O 3 coatings are composed of WC, W 2 C, Al 2 O 3 , La 2 O 3 , LaAlO 3 , and Fe-Crphases. The corrosion current density i corr of the substrate, WC10Co4Cr-Al 2 O 3 , and WC10Co4Cr-Al 2 O 3 -La 2 O 3 coatings decreases from 2.424 × 10 −5 to 6.840 × 10 −7 A•cm −2 ; and the corresponding polarization resistance R p and charge transfer resistance R ct increase from 1371 to 64 536 Ω•cm 2 and from 1568 to 14 020 Ω•cm 2 , respectively. The La 2 O 3 -reinforced WC10Co4Cr-Al 2 O 3 coatings have higher electrochemical corrosion resistance than the Al 2 O 3 -reinforced WC10Co4Cr coatings, and the WC10Co4Cr-6%Al 2 O 3 -9%La 2 O 3 coating presents the highest electrochemical corrosion resistance among all the experimental coatings.

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“…7b. The linear relationship between log |Z| and log f indicates that the passive film is stable and exhibits a good protective effect on the material over a wide frequency range, thereby inhibiting the penetration of corrosive medium into the substrate through the passive film [20]. The maximum value of the phase angle is less than − 80°, indicating that a stable passive film is formed on the surface of the sample in the NaCl solution [21].…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Influence of Aging Time on Microstructure and Corrosion Behavior of a Cu-Bearing 17Cr–1Si–0.5Nb Ferritic Heat-Resistant Stainless Steel

Zhang

Han

Wen

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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17Cr-1Si-0.5Nb-1.2Cu ferritic heat-resistant stainless steel was aged at 750 °C from 10 min to 30 h to simulate time aging and study the microstructural evolution and its effect on corrosion behavior by using optical microscopy, scanning electron microscopy, transmission electron microscopy, potentiodynamic polarization, electrochemical impedance spectroscopy, and the Mott-Schottky approach. Four types of precipitates were discovered, including ε-Cu, NbC, Fe 3 Nb 3 C, and Fe 2 Nb-type Laves phase. The nano-sized ε-Cu phase forms first, and its fraction follows the parabolic law change and is the largest. Compared to NbC and Fe 3 Nb 3 C particles, the coarsening of the Laves phase is the most pronounced. The aging process is divided into three parts: early-aged (0-5 h), peak-aged (5 h), and over-aged (5-30 h). However, the corrosion resistance is reduced in the early-aged stage of 0-2 h. Further extending the aging time to 30 h, the corrosion resistance is gradually improved. This change may be related to the competitive relationship between the beneficial effects of the Cu-rich phase and the harmful effects of Nb-containing particles. The dissolved Cu on the surface becomes more effective for the suppression of the anodic dissolution by the formation of ionic compounds of chlorine, thereby reducing the deterioration of corrosion resistance caused by Nb-rich precipitation.

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Effects of the precipitation of secondary phases on the erosion-corrosion of 25% Cr duplex stainless steel

Cited by 28 publications

References 47 publications

Effect of Secondary-Phase Precipitation on Mechanical Properties and Corrosion Resistance of 00Cr27Ni7Mo5N Hyper-Duplex Stainless Steel during Solution Treatment

Effect of Secondary-Phase Precipitation on Mechanical Properties and Corrosion Resistance of 00Cr27Ni7Mo5N Hyper-Duplex Stainless Steel during Solution Treatment

Effects on Al₂O₃ and La₂O₃ additions on electrochemical performances of laser‐cladded WC10Co4Cr coatings

Influence of Aging Time on Microstructure and Corrosion Behavior of a Cu-Bearing 17Cr–1Si–0.5Nb Ferritic Heat-Resistant Stainless Steel

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Effects of the precipitation of secondary phases on the erosion-corrosion of 25% Cr duplex stainless steel

Cited by 28 publications

References 47 publications

Effect of Secondary-Phase Precipitation on Mechanical Properties and Corrosion Resistance of 00Cr27Ni7Mo5N Hyper-Duplex Stainless Steel during Solution Treatment

Effect of Secondary-Phase Precipitation on Mechanical Properties and Corrosion Resistance of 00Cr27Ni7Mo5N Hyper-Duplex Stainless Steel during Solution Treatment

Effects on Al2O3 and La2O3 additions on electrochemical performances of laser‐cladded WC10Co4Cr coatings

Influence of Aging Time on Microstructure and Corrosion Behavior of a Cu-Bearing 17Cr–1Si–0.5Nb Ferritic Heat-Resistant Stainless Steel

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Effects on Al₂O₃ and La₂O₃ additions on electrochemical performances of laser‐cladded WC10Co4Cr coatings