Influence of the dissolved oxygen content on corrosion of the ferritic–martensitic steel P92 in supercritical water

Zhang, Naiqiang; Xu, Hong; Li, Bao-rang; Bai, Yaping; Dongyu, Liu

doi:10.1016/j.corsci.2011.11.013

Cited by 95 publications

(47 citation statements)

References 27 publications

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“…For NF616, the simulation of oxidation weight gain is higher than the experimental values at 600 ∘ C. The maximum difference between calculation and experiment of weight gain at 600 ∘ C for 3000 hours is 306 mg/dm 2 and is equivalent to thickness of about 22 m. The reason is that the hematite phase was not detected in outer oxide layer [8], and the selective thermodynamic equilibrium oxygen partial pressure of reaction (6) is larger than actual pressure during calculation. The simulation of oxidation weight gain is lower than the experimental values at 500 ∘ C. The maximum difference between calculation and experiment of weight gain for 3000-hour exposure is 76 mg/dm 2 and is equivalent to thickness of about 5.4 m.…”

Section: Comparison Between Simulation and Experiments Of Oxide Weighmentioning

confidence: 89%

“…For HCM12A, the simulation of oxidation weight gain is lower than experimental value at 500 ∘ C and 600 ∘ C. The maximum difference between calculation and experiment of weight gain at 600 ∘ C is 104 mg/dm 2 and is equivalent to thickness of about 7.5 m according to formula (8). The maximum difference between calculation and experiment of weight gain at 500 ∘ C is 181 mg/dm 2 and is equivalent to thickness of about 13 m. The maximum difference between calculation and experiment of weight gain at 400 ∘ C is 2 mg/dm 2 and is equivalent to thickness of about 1.57 m.…”

Section: Comparison Between Simulation and Experiments Of Oxide Weighmentioning

confidence: 99%

“…The results indicated that the weight gain increased with the dissolved oxygen content [8]. The oxidation behavior of ferritic/martensitic steel HCM12A exposed in SCW at 500 ∘ C, 25 MPa, and two levels of oxygen partial pressure were investigated.…”

Section: Introductionmentioning

confidence: 99%

“…Using (1)- (5), (8), the simulation is performed for HAM12A and NF616 exposed to supercritical water at 400 ∘ C, 500 ∘ C, and 600 ∘ C under 25 MPa. The comparison between simulation and experiments of oxide weight gain are presented in Figure 3.…”

Section: Comparison Between Simulation and Experiments Of Oxide Weighmentioning

confidence: 99%

“…The density of oxide scales is nearly constant, and the thickness of inner and outer layers of oxide scales is becoming thicker with exposure time increasing. The relation between weight gain and thickness of inner and outer layers of oxide scale was estimated by the following equation [8]:…”

Section: Relation Between Weight Gain and Thickness Of Inner Andmentioning

confidence: 99%

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Estimation of Oxidation Kinetics and Oxide Scale Void Position of Ferritic-Martensitic Steels in Supercritical Water

Sun

Yan

2017

Advances in Materials Science and Engineering

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Exfoliation of oxide scales from high-temperature heating surfaces of power boilers threatened the safety of supercritical power generating units. According to available space model, the oxidation kinetics of two ferritic-martensitic steels are developed to predict in supercritical water at 400 ∘ C, 500 ∘ C, and 600 ∘ C. The iron diffusion coefficients in magnetite and Fe-Cr spinel are extrapolated from studies of Backhaus and Töpfer. According to Fe-Cr-O ternary phase diagram, oxygen partial pressure at the steel/Fe-Cr spinel oxide interface is determined. The oxygen partial pressure at the magnetite/supercritical water interface meets the equivalent oxygen partial pressure when system equilibrium has been attained. The relative error between calculated values and experimental values is analyzed and the reasons of error are suggested. The research results show that the results of simulation at 600 ∘ C are approximately close to experimental results. The iron diffusion coefficient is discontinuous in the duplex scale of two ferritic-martensitic steels. The simulation results of thicknesses of the oxide scale on tubes (T91) of final superheater of a 600 MW supercritical boiler are compared with field measurement data and calculation results by Adrian's method. The calculated void positions of oxide scales are in good agreement with a cross-sectional SEM image of the oxide layers.

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Section: Comparison Between Simulation and Experiments Of Oxide Weighmentioning

confidence: 89%

Section: Comparison Between Simulation and Experiments Of Oxide Weighmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Comparison Between Simulation and Experiments Of Oxide Weighmentioning

confidence: 99%

Section: Relation Between Weight Gain and Thickness Of Inner Andmentioning

confidence: 99%

See 3 more Smart Citations

Estimation of Oxidation Kinetics and Oxide Scale Void Position of Ferritic-Martensitic Steels in Supercritical Water

Sun

Yan

2017

Advances in Materials Science and Engineering

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Corrosion behavior of a 304-oxide dispersion strengthened austenitic stainless steel in supercritical water

Zhou

Zhang

et al. 2015

Materials and Corrosion

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The corrosion behavior of a 304 oxide dispersion strengthened (ODS) austenitic stainless steel after being exposed to supercritical water (SCW) with dissolved oxygen of 300 ppb at 600 8C/25 MPa was studied. By the means of a least-square fit, the weight gain (Dw) of the samples as a function of exposure time (t) could be described by the equation Dw ¼ 8.011 Â t 0.459 . An approximately parabolic time law in this specified SCW environment can be assumed. A triple protective oxide layer formed on the surface of the metal with the exposure time up to 1000 h. Furthermore, the result of slow-strain rate tensile (SSRT) test indicated that the 304-ODS austenitic stainless steel was not susceptible to stress corrosion cracking (SCC) in SCW at 600 8C/25 MPa.

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Stress corrosion cracking behavior of 310S stainless steel in supercritical water at different temperature

Liu¹,

Tan²,

Jiang³

et al. 2018

Materials & Corrosion

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The stress corrosion cracking (SCC) behavior and tensile properties of 310S stainless steel were studied by slow strain rate tensile (SSRT) tests, which were carried out in oxygenated supercritical water at the temperature of 400, 550, and 620 °C, respectively. The distribution of chemical composition of oxide, tensile properties, fracture morphology of the materials were analyzed for evaluating the SCC susceptibility of 310S stainless steel, respectively. The results show that both the elongation and tensile strength decreased significantly with the increase of the temperature, implying that a higher temperature may lead to a higher SCC susceptibility. The remarkable changes of the morphology of the fracture surface and gauge surface of 310S stainless steel were observed at different temperatures, that is, from an entire ductile fracture at lower temperature to a brittle fracture at higher temperature. The temperature has significant effects on morphologies and thickness. Oxides with double layer were observed. TEM analysis revealed that the inner oxide layer is composed of Cr and O, and Ni‐enrichment can be observed to segregate at the metal‐oxide interface.

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Influence of the dissolved oxygen content on corrosion of the ferritic–martensitic steel P92 in supercritical water

Cited by 95 publications

References 27 publications

Estimation of Oxidation Kinetics and Oxide Scale Void Position of Ferritic-Martensitic Steels in Supercritical Water

Estimation of Oxidation Kinetics and Oxide Scale Void Position of Ferritic-Martensitic Steels in Supercritical Water

Corrosion behavior of a 304-oxide dispersion strengthened austenitic stainless steel in supercritical water

Stress corrosion cracking behavior of 310S stainless steel in supercritical water at different temperature

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