Morphologies of oxide growth and exfoliation in superheater and reheater tubing of steam boiler

Wright, I.G.; Dooley, R.B.

doi:10.1179/096034011x12982937656387

Cited by 12 publications

(17 citation statements)

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“…The parabolic rate constants were found to be two orders of magnitude higher than the kp values stated in the literature, 1.7 x 10 -17 m 2 s -1 [13], however it has been noted that oxidation kinetics do tend to be higher for shorter term tests [17]. This literature value is also for the total oxide thickness for TP347H FG from plant trials where the steam environment will be slightly different from those in this study.…”

Section: Oxidation Kineticscontrasting

confidence: 65%

“…In all cases, the first exposure results in the formation of an outer layer of haematite, which, on cooling, undergoes substantial spallation. Haematite formation has been found to favour spallation due to the mismatch of the thermal expansion coefficients between oxide and alloy [13] which is part of a larger study. However, re-exposure does not lead to further formation of haematite with a noticeable reduction in spallation.…”

Section: Discussionmentioning

confidence: 95%

“…It has also been found that between 500 and 800 °C TP347H FG forms a duplex scale when exposed to steam [12]. The outer iron rich oxide has been found to be a mixture of haematite and magnetite [6,13].…”

Section: Introductionmentioning

confidence: 95%

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The effect of thermal cycling on steam oxidation behaviour of TP347H FG at 650 °C

Mobbs

Osgerby²,

Taylor

et al. 2017

Materials at High Temperatures

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Section: Oxidation Kineticscontrasting

confidence: 65%

Section: Discussionmentioning

confidence: 95%

See 1 more Smart Citation

The effect of thermal cycling on steam oxidation behaviour of TP347H FG at 650 °C

Mobbs

Osgerby²,

Taylor

et al. 2017

Materials at High Temperatures

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“…SEM and EDS investigations indicated that the steam-side oxide scales studied in this work roughly consisted of two layers with magnetite and Fe-Cr spinel, respectively, being the outer and inner layers, which is similar to the prior works. 6 The boiler tubes were cut into the tension test specimens (Fig. 1) employing electrical discharge machine.…”

Section: A Specimen Manufacturingmentioning

confidence: 99%

“…First, the through-scale cracks in oxide scales can serve as convenient tunnels for the high temperature steam to attack the underlying fresh tube substrate. 6 Second, the exfoliated oxide scales may accumulate inside the tube bends and even result in tube blockage. [7][8][9] The flow of steam inside the tubes will then be restricted, which may result in short-term tube overheat and even failure eventually.…”

mentioning

confidence: 99%

Acoustic emission analysis on tensile failure of steam-side oxide scales formed on T22 alloy superheater tubes

Huang

Zhou

Wang

et al. 2014

Journal of Applied Physics

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Failure of steam-side oxide scales on boiler tubes can seriously influence the safety of coal-fired power plants. Uniaxial tensile tests employing acoustic emission (AE) monitoring were performed, in this work, to investigate the failure behavior of steam-side oxide scales on T22 alloy boiler superheater tubes. The characteristic frequency spectra of the captured AE signals were obtained by performing fast Fourier transform. Three distinct peak frequency bands, 100-170, 175-250, and 280-390 kHz, encountered in different testing stages were identified in the frequency spectra, which were confirmed to, respectively, correspond to substrate plastic deformation, oxide vertical cracking, and oxide spalling with the aid of scanning electronic microscopy observations, and can thus be used for distinguishing different oxide failure mechanisms. Finally, the critical cracking strain of the oxide scale and the interfacial shear strength of the oxide/substrate interface were estimated, which are the critical parameters urgently desired for modeling the failure behavior of steam-side oxide scales on boiler tubes of coal-fired power plants.

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Investigation on High Temperature Corrosion Characteristic of Super304H, TP347H, and HR3C Steel in an Ultra‐supercritical Coal‐fired Boiler^▴

Wang

Liang

et al. 2020

Fuel Cells

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The high temperature corrosion characteristic of Super304H, TP347H, and HR3C steel in an ultra‐supercritical coal‐fired boiler with service time of 17,973 h was investigated. The samples were analyzed by XRD, SEM, and EDS. The results showed that corrosion scales were composed and could be divided into three layers, including outer layer with composite reaction of alkalis and sulfate, middle layer with oxidation, and penetrated inner layer with oxidation and sulfidation. In addition, spalling of corrosion scales in the Super304H and TP347H samples was observed with the reasons of low Cr content and thermal expansion difference between different corrosion layers.

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Morphologies of oxide growth and exfoliation in superheater and reheater tubing of steam boiler

Cited by 12 publications

References 0 publications

The effect of thermal cycling on steam oxidation behaviour of TP347H FG at 650 °C

The effect of thermal cycling on steam oxidation behaviour of TP347H FG at 650 °C

Acoustic emission analysis on tensile failure of steam-side oxide scales formed on T22 alloy superheater tubes

Investigation on High Temperature Corrosion Characteristic of Super304H, TP347H, and HR3C Steel in an Ultra‐supercritical Coal‐fired Boiler^▴

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Morphologies of oxide growth and exfoliation in superheater and reheater tubing of steam boiler

Cited by 12 publications

References 0 publications

The effect of thermal cycling on steam oxidation behaviour of TP347H FG at 650 °C

The effect of thermal cycling on steam oxidation behaviour of TP347H FG at 650 °C

Acoustic emission analysis on tensile failure of steam-side oxide scales formed on T22 alloy superheater tubes

Investigation on High Temperature Corrosion Characteristic of Super304H, TP347H, and HR3C Steel in an Ultra‐supercritical Coal‐fired Boiler▴

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Investigation on High Temperature Corrosion Characteristic of Super304H, TP347H, and HR3C Steel in an Ultra‐supercritical Coal‐fired Boiler^▴