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Non-destructive and optical thickness measurements of steam grown oxide on contacting surfaces of power plant

: Piedra, E.M.; Lodeiro, M.J.; Fry, A.T.

Gandy, D. ; Electric Power Research Institute -EPRI-, NDE Center:
Advances in materials technology for fossil power plants : Proceedings from the seventh international conference; October 22 - 25, 2013, Waikoloa, Hawaii, USA
Materials Park, Ohio: ASM International, 2014
ISBN: 1-62708-060-0
ISBN: 978-1-62708-060-6
International Conference on Advances in Materials Technology for Fossil Power Plants <7, 2013, Waikoloa/Hawaii>
Fraunhofer IWM ()

Both non-destructive and traditional microsectioning techniques have been used to measure the oxide thickness of steam grown oxides between two close contacting surfaces. Different power plant materials, nickel based alloys and ferritic-martensitic steels, were exposed to steam oxidation at temperatures ranging from 650°C up to 750°C and periods from 500 h to 3000 h. Ultrasonic measurements of thickness, based on the speed of sound in the oxide, were performed and compared to optical thickness measurements based on conventional metallographic microsectioning with promising results. Improvements on the measurement resolution have been practically demonstrated with oxides down to 65 m thickness being measured successfully.