The failure analysis of 9–12% chromium steel tubes, containing about 2.5% molybdenum, is discussed in the present study. The component is used in a steam power plant boiler as a high-temperature superheater tube and has been in service for about 100,000 h. The failure occurred without appreciable wall thinning. Specimens were taken from the region beneath the fracture surface and investigated by optical and electron microscopes. The microstructure was composed of ferrite and grain boundary particulate carbides. The results indicated that the fracture was initiated because of the bending of the tube near the anchor and propagation of the crack through the interfaces between massive carbides and matrix (sensitized zone). Final fracture has occurred as a result of an overload due to the decreasing of load carrying section produced by crack propagation.
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December 2009
Research Papers
Failure Analysis of a 9–12%Cr Steel Superheater Tube
E. Pour saeidi,
E. Pour saeidi
Department of Mechanical Engineering,
epsaeidi@mail.znu.ac.ir
Zanjan University
, Zanjan 31585-381 Iran; IPPR Research Laboratory, Iran Power Plant Repair Co.
, Karaj, Iran
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M. Aieneravaie,
M. Aieneravaie
IPPR Research Laboratory,
Iran Power Plant Repair Co.
, Karaj, Iran
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M. R. Mohammadi Arhani
M. R. Mohammadi Arhani
IPPR Research Laboratory,
Iran Power Plant Repair Co.
, Karaj, Iran
Search for other works by this author on:
E. Pour saeidi
Department of Mechanical Engineering,
Zanjan University
, Zanjan 31585-381 Iran; IPPR Research Laboratory, Iran Power Plant Repair Co.
, Karaj, Iranepsaeidi@mail.znu.ac.ir
M. Aieneravaie
IPPR Research Laboratory,
Iran Power Plant Repair Co.
, Karaj, Iran
M. R. Mohammadi Arhani
IPPR Research Laboratory,
Iran Power Plant Repair Co.
, Karaj, IranJ. Pressure Vessel Technol. Dec 2009, 131(6): 061401 (9 pages)
Published Online: September 23, 2009
Article history
Received:
May 3, 2008
Revised:
May 6, 2009
Published:
September 23, 2009
Citation
Pour saeidi, E., Aieneravaie, M., and Arhani, M. R. M. (September 23, 2009). "Failure Analysis of a 9–12%Cr Steel Superheater Tube." ASME. J. Pressure Vessel Technol. December 2009; 131(6): 061401. https://doi.org/10.1115/1.3147982
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