Behaviour of T91 Steel Oxide Scale Exposure to Temperature at 540°C for Different Exposure Duration

Mohamad Nadzir Suraya; Amrin Astuty; B. Hariffin; Roslina Mohammad

doi:10.4028/www.scientific.net/SSP.264.160

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HomeSolid State PhenomenaSolid State Phenomena Vol. 264Behaviour of T91 Steel Oxide Scale Exposure to...

Behaviour of T91 Steel Oxide Scale Exposure to Temperature at 540°C for Different Exposure Duration

Abstract:

Grade T91 steel is one of a common material used for construction of superheater tubes in power generation boiler. In general, superheater tubes that operates in subcritical boiler are expose to operating temperatures in the range between 540°C to 580°C. Exposure to high temperature makes this steel subject to formation of oxide scale which can cause detrimental effect on the material properties. Excessive formation of oxide scale on internal surface of superheater tube can cause overheating damage at early stage of the boiler operation. This study was conducted to examine the behaviour of oxide scale forms on T91 steel for specimens exposed to temperature of 540°C for 200, 400, 600, 800 and 1000 hours holding time. The oxidation kinetic was identified as parabolic and the oxide scale was observed having 3 different layers which are haematite (Fe₂O₃), magnetite (Fe₃O₄) and spinel _(Fe,Cr)2O₃. The oxide scales layers were observed separated by voids and crack which are growing in size over time.

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Periodical:

Solid State Phenomena (Volume 264)

Pages:

160-164

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.264.160

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Online since:

September 2017

Authors:

Mohamad Nadzir Suraya*, Amrin Astuty, B. Hariffin, Roslina Mohammad

Keywords:

Oxide Scale, T91 Steel

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