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

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 superh...

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Bibliographic Details
Published in:Journal of applied physics 2014-07, Vol.116 (4)
Main Authors: Huang, Jun-Lin, Zhou, Ke-Yi, Wang, Xin-Meng, Tu, Yi-You, Xu, Jian-Qun
Format: Article
Language:English
Subjects:
Acoustic emission testing
ALLOYS
Applied physics
Boiler tubes
BOILERS
Coal-fired power plants
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Deformation mechanisms
EMISSION
Emission analysis
Failure analysis
Failure mechanisms
FAILURES
Fast Fourier transformations
FOURIER TRANSFORMATION
Fourier transforms
Frequencies
HEATERS
Industrial plant emissions
INTERFACES
Interfacial shear strength
OXIDES
Parameter estimation
Peak frequency
Plastic deformation
PLASTICITY
POWER PLANTS
Scale (corrosion)
SCANNING ELECTRON MICROSCOPY
SHEAR PROPERTIES
Shear strength
SIMULATION
Spalling
SPECTRA
STEAM
STRAINS
SUBSTRATES
Tensile tests
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Summary: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.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4891456