Stress corrosion crack propagation affected by microstructures for nuclear steam turbine rotor steels in the simulated environment

Weng, Shuo; Huang, Yuhui; Lin, Shaochong; Xuan, Fu‐Zhen

doi:10.1016/j.jmrt.2022.01.020

Cited by 10 publications

(2 citation statements)

References 56 publications

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“…The K I will increase until the critical K I value where SCC is triggered (K ISCC ) is reached, which for UNS S32205, a K ISCC ≈ 50 MPa √ m will be assumed based on literature [46,47]. Figure 8 shows the υ crack and the stress as a function of time for SCPS (Figure 8a) and CBS (Figure 8b).…”

Section: Crack Propagation Ratementioning

confidence: 99%

Stress Corrosion Cracking Mechanisms of UNS S32205 Duplex Stainless Steel in Carbonated Solution Induced by Chlorides

Martin

Bastidas

2023

Metals

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Herein, the chloride-induced stress corrosion cracking (SCC) mechanisms of UNS S32205 duplex stainless steel (DSS) reinforcing bars in alkaline and carbonated solutions are studied. Electrochemical monitoring and mechanical properties were tested using linear polarization resistance and electrochemical impedance spectroscopy, coupled with the slow strain rate tensile test (SSRT) to evaluate the SCC behavior and unravel the pit-to-crack mechanisms. Pit initiation and crack morphology were identified by fractographic analysis, which revealed the transgranular (TG) SCC mechanism. HCO3− acidification enhanced the anodic dissolution kinetics, thus promoting a premature pit-to-crack transition, seen by the decrease in the maximum phase angle in the Bode plot at low frequencies (≈ 1 Hz) for the carbonated solution. The crack propagation rate for the carbonated solution increased by over 100% compared to the alkaline solution, coinciding with the lower phase angle from the Bode plots, as well as with the lower charge transfer resistance. Pit initiation was found at the TiN nonmetallic inclusion inside the ferrite phase cleavage facet, which developed TG-SCC.

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Section: Crack Propagation Ratementioning

confidence: 99%

Stress Corrosion Cracking Mechanisms of UNS S32205 Duplex Stainless Steel in Carbonated Solution Induced by Chlorides

Martin

Bastidas

2023

Metals

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“…Also, one of the most important ways to prevent the destruction of boilers is the correct use and removal of fuel impurities, fuel additives, the chemical improvement of boiler feed water, and choosing the suitable alloy and its proper coating. Austenitic steels and nickel-based superalloys are suitable candidates for increasing the efficiency of heat exchangers at temperatures higher than 700 °C [3,4]. If a suitable coating is used, austenitic steels can be a suitable alternative to nickel-based superalloys, which are expensive [5].…”

Section: Introductionmentioning

confidence: 99%

The effect of aluminide coating on the steam oxidation behavior of SS321 steel at 700 °C

Shirvani,

Taheri,

Hadadipour

et al. 2023

Phys. Scr.

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Steam oxidation is considered the main attack form involved in the destruction of a superheater tubes in the superheater of water-tube boiler. In this work, the effect of an aluminide coating on the way steam reacts with SS321 steel in a superheater was studied. Aluminide coating was done by powder cementation at 800 °C for 7 h and then heat treatment at 900 °C for 1 h. The coating was made with an Al-rich Fe2Al5 phase, with an inner (diffusion) layer of 5 µm and an outer layer of 25 µm. The grains were all the same size, and there were few holes. The samples were subjected to a constant stream of supersaturated water vapor at a temperature of 700 °C. The weight gain of uncoated and coated samples was measured as 1 mg/cm2 and 0.5 mg/cm2 after 20 h, and 2.5 mg/cm2 and 0.7 mg/cm2 after 350 h, respectively. The remarkable weight loss of the coated samples after 20 h and up to 350 h was attributed to the formation of stable Al2O3 oxides. This was although in the uncoated samples, the outer and inner layers of the coating were composed of Fe-rich oxides (magnetite) and Cr-rich oxides (Cr-Fe spinel oxides), respectively. Microstructural studies showed that with the increase in oxidation time, the inner layer (diffusion) increases from 5 µm to 25 µm, which is attributed to the diffusion of substrate particles towards the coating during oxidation.

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Investigation on the hydrogen induced cracking behaviour of heat-treated pipeline steel

Zhang,

Chen,

et al. 2024

Engineering Failure Analysis

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Stress corrosion crack propagation affected by microstructures for nuclear steam turbine rotor steels in the simulated environment

Cited by 10 publications

References 56 publications

Stress Corrosion Cracking Mechanisms of UNS S32205 Duplex Stainless Steel in Carbonated Solution Induced by Chlorides

Stress Corrosion Cracking Mechanisms of UNS S32205 Duplex Stainless Steel in Carbonated Solution Induced by Chlorides

The effect of aluminide coating on the steam oxidation behavior of SS321 steel at 700 °C

Investigation on the hydrogen induced cracking behaviour of heat-treated pipeline steel

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