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Oxidation Behaviour...
Oxidation Behaviour of Sanicro 25 (42Fe22Cr25NiWCuNbN) in O-2/H2O Mixture at 600 degrees C
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- Intiso, Luciana, 1981 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Johansson, Lars-Gunnar, 1952 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Canovic, Sead, 1979 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Bellini, S. (författare)
- Centro Sviluppo Materiali S.p.A.
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- Svensson, Jan-Erik, 1965 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Halvarsson, Mats, 1965 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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Chalmers tekniska högskola Centro Sviluppo Materiali Sp.A. (creator_code:org_t)
- 2012-01-22
- 2012
- Engelska.
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Ingår i: Oxidation of Metals. - : Springer Science and Business Media LLC. - 1573-4889 .- 0030-770X. ; 77:5-6, s. 209-235
- Relaterad länk:
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http://dx.doi.org/10...
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https://doi.org/10.1...
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https://research.cha...
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Abstract
Ämnesord
Stäng
- The present study investigates oxidation at 600 A degrees C of alloy Sanicro 25 (42Fe22Cr25NiWCuNbN) in dry and wet O-2 environments. The exposure time was 1-168 h. The oxidized samples were analyzed by grazing incidence X-ray diffraction, glow discharge optical emission spectroscopy, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray spectroscopy. Alloy Sanicro 25 showed protective oxidation behaviour under the present conditions. Initially, a thin and smooth corundum-type single layer base oxide formed, featuring a Cr-rich bottom part and a Fe-rich top. With time, double-layered oxide nodules form consisting of inward- and outward-growing parts. Below the oxide scale a 100-200 nm thick oxidation-affected zone formed in the alloy, which was depleted in Cr and enriched in Ni. In this region the chromium carbides and copper-rich particles present in the bulk alloy were dissolved. In O-2 + H2O environment, chromium volatilized from the surface, causing the chromium content of the oxide to be lower than after oxidation in dry O-2. However, under present experimental conditions, the Cr depletion of the scale was not enough to trigger accelerated corrosion of the alloy.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
Nyckelord
- scales
- Sanicro 25
- chromium evaporation
- oxygen
- oxides
- water-vapor
- steel
- Oxidation
- Chromia evaporation
- flow-rate
- oxidation
- Chromia former
- Water vapour effect
- steam
- high-temperature oxidation
- environments
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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