Analysis of High Temperature Steam Oxidation of Superheater Steels Used in Coal Fired Boilers

Dudziak, T.; Łukaszewicz, Mikołaj; Simms, N.J.; Nicholls, John

doi:10.1007/s11085-015-9593-9

Cited by 25 publications

(13 citation statements)

References 27 publications

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“…7 In Fe-Cr system, Cr has highest affinity to oxygen and can form an oxide at very low partial pressure of oxygen. Cr 2 O 3 is the most stable oxide, which has the lowest DG of formation (Table 4) in this temperature range among the other oxides of Fe-Cr system; thus, it forms at the very initial stage of oxidation 1). In case of a steel having less than 12 wt.% Cr, the scale does not cover the whole surface therefore the surface is not fully protected from oxidation.…”

Section: Oxidation Of the T91mentioning

confidence: 93%

Effect of Ultrasonic Shot Peening on Oxidation Behavior of T91 and SS347 Steels in Air and Steam at 650 °C

Mondal

Chattopadhyay

Singh

2020

J. of Materi Eng and Perform

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Ultrasonic shot peening (USP) is a relatively new process of surface modification to improve mechanical properties as well as corrosion and high-temperature oxidation resistance of metallic materials. The effect of USP on surface properties and the process of high-temperature oxidation in air and steam environment, following USP of the T91 and SS347 steels, was studied in this investigation. Surface modification by USP was done on the T91 and SS347 steels for different time periods of 0.5, 1.0, 1.5, 2.0 and 3.0 min. Microstructural modification, increase in surface roughness and enhancement in microhardness up to a depth of 300-350 lm were observed due to USP. There was also increment in surface roughness as well as microhardness with USP time duration. Thermogravimetric analysis of the oxidation tests showed parabolic oxidation kinetics at 650°C for both the steels. Comparatively more protective oxide scales, containing high amount of Cr, were formed on the USP-treated samples. The thickness of the oxide scale was reduced with increase in the USP time duration. Oxidation resistance of the T91 steel at 650°C, both in air and steam, was improved by the USP treatment. Oxidation resistance of the SS347 steel at 650°C was also improved for the USP2.0 and the USP3.0 conditions.

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Section: Oxidation Of the T91mentioning

confidence: 93%

Effect of Ultrasonic Shot Peening on Oxidation Behavior of T91 and SS347 Steels in Air and Steam at 650 °C

Mondal

Chattopadhyay

Singh

2020

J. of Materi Eng and Perform

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“…An increase in the oxide thickness occurs because of an increase in surface area due to the significant increase in the defects caused by the rapid oxide growth, which potentially provides myriad of sites for the adsorption of oxidation gas and hence leads to fast oxidation kinetics. A large increase in the rate of oxidation of the base steel in an atmosphere containing water vapor was supported by significant diffusion paths of iron ions from the bulk steel at high temperatures [9]. This can be seen in the increase in the thickness of the oxide layer as time and temperature of exposure are increased, Figure-1b.…”

Section: Oxidation Kinetics Of the Samples With And Without An Al-coamentioning

confidence: 93%

High temperature oxidation of low carbon steel with and without an Al coating in an atmosphere containing burning ethanol

Hakam

Wang

Wardono

et al. 2018

AIP Conference Proceedings

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High temperature oxidation of low carbon steel (SAPH440) with and without a hot-dip Al coating in an atmosphere containing burning ethanol, water vapor, and air were studied by isothermal oxidation at 600 °C, 650 °C, 700 °C, and 750 °C over 49 h. The experimental results show that the water vapor and hydrogen produced by ethanol burning in the atmosphere promotes an increase in weight gain and metal loss in the bare steel. The growth of the iron oxide layer is attributed to large amounts of hydrogen dissolved in the iron oxide layer leading to fast oxidation kinetics. The protective Al2O3 layer formed on the surface of aluminide steel can serve as a barrier to hydrogen penetration in the aluminide layer; thus, the oxidation rate of bare steel was significantly slower in the atmosphere containing both water vapor and hydrogen.Disruptive Innovation in Mechanical Engineering for Industry Competitiveness AIP Conf. Proc. 1983, 050002-1-050002-7; https://doi.

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“…[10][11][12] The oxide formation is correlated with the thermodynamic properties of the oxide, oxide-metal, and oxide-steam interfaces, [13][14][15] extensive research studies have been carried out to understand oxide formation mechanism on FeCr alloys. [16][17][18][19][20][21][22] Zhu et al [23] investigated the oxidation behavior of ferritic-martensitic steel exposed to deaerated supercritical water at 560-650°C and 25 MPa by oxidation experiment, and the oxidation kinetics at different temperature was analyzed. Furthermore, a large number of models have been put forward for determining the kinetics of the oxide formation.…”

Section: Introductionmentioning

confidence: 99%

The role of Cr atom in the early steam oxidation of Fe‐based alloys: An atomistic simulation

Jing

Liang

et al. 2020

Materials & Corrosion

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This study employed the density functional theory to capture the atomic‐level dissociation processes of steam and investigate the ions migration on Fe(001) and FeCr(001) surfaces, revealing the role of Cr atom in the early oxidation. Various coadsorption structures with different steam‐derived species have been systematically examined to find the most energetically favored surface site. The results showed that the steam dissociation on the alloy surface underwent two steps. First, H2O molecule on the top site was dissociated into OH group and H atom, which further combined with metal atoms on the bridge site and hollow site. Second, the OH group was decomposed into O and H atoms, which moved to two adjacent hollow sites and generated an oxide. On further oxidation, the Fe atom migrated outward and formed an outer Fe oxide, whereas the Cr oxide could only grow inward as O atom passed through oxide. It was found that the presence of Cr atom on the surface was thermodynamically beneficial, which could promote steam oxidation. The Cr atom could effectively block ion diffusion across the oxide scale and protect the underlying substrate from further oxidation. These results were in good agreement with experimental observation.

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Analysis of High Temperature Steam Oxidation of Superheater Steels Used in Coal Fired Boilers

Cited by 25 publications

References 27 publications

Effect of Ultrasonic Shot Peening on Oxidation Behavior of T91 and SS347 Steels in Air and Steam at 650 °C

Effect of Ultrasonic Shot Peening on Oxidation Behavior of T91 and SS347 Steels in Air and Steam at 650 °C

High temperature oxidation of low carbon steel with and without an Al coating in an atmosphere containing burning ethanol

The role of Cr atom in the early steam oxidation of Fe‐based alloys: An atomistic simulation

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