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Pillai, Sujit; Barasi, N. Sivai; Khatak, H. S.

doi:10.1023/a:1004595016655

Oxidation of Metals

2000

DOI: 10.1023/a:1004595016655

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Sujit Pillai

N. Sivai Barasi

H. S. Khatak

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Cited by 14 publications

(1 citation statement)

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“…Besides, the AE research efforts carried out so far mainly rely on amplitude distribution analysis 17,18 or time domain parameters like number of AE events, ring down counts, rise time, or event duration. [19][20][21] Whereas, few studies benefit from the frequency domain information carried by the AE waveforms. Further, to get the steam-side oxide scales for performing experimental tests, one preferred method is to oxidize the alloy in laboratory conditions intentionally designed to mimic the practical steam-side operation condition of boiler tubes, since the geometry of the specimen, the steam temperature, and the oxidation time can then be easily controlled.…”

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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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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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Investigation of steam oxidation behaviour of TP347H FG. Part 2: Exposure at 91 bar

Jiang¹,

Montgomery²,

Larsen³

et al. 2005

Materials & Corrosion

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Tube specimens of TP347FG were exposed in a test superheater loop in a biomass plant in Denmark. The specimens were exposed to surface metal temperatures in the range of 455 -568 8C, steam pressure of 91 bar and exposure duration of 3500 and 8700 hours. The oxide thickness and morphology was investigated using light optical and scanning electron microscopy. The oxide present on the specimens is a duplex oxide with an inner chromium rich oxide and an outer iron rich oxide. The inner oxide consisted of a primary iron chromium nickel oxide in the original alloy grain and a chromium rich oxide, "healing layer", at the grain boundaries. This gave the appearance of uneven inner oxide and it was clear that the varying subsurface grain size affected inner oxide thickness, especially after longer exposure times. Longer exposure times from 3500 to 8700 hours resulted in increased pit thickness. Comparison of pit thickness revealed that increase of temperature from 455 to 525 8C increases the oxidation rate, however a further increase in temperature did not result in thicker inner oxide presumably due to the formation of a better healing layer at grain boundaries. These results are compared with the previous paper where the pressure and temperature was higher. A thicker inner oxide is observed at the lower temperatures and pressures compared with higher temperatures and pressures. Reasons for this behaviour are discussed.

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Effect of chromium on the formation of intermetallic phases in hot-dipped aluminide Cr–Mo steels

Cheng

Wang

2013

Applied Surface Science

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Cited by 14 publications

References 8 publications

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

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

Investigation of steam oxidation behaviour of TP347H FG. Part 2: Exposure at 91 bar

Effect of chromium on the formation of intermetallic phases in hot-dipped aluminide Cr–Mo steels

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