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On the breakaway oxidation of Fe9Cr1Mo steel in high pressure CO2
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2017 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 130, 361-374 p.Article in journal (Refereed) Published
Abstract [en]

Fundamental insights into the mechanism of breakaway oxidation in Fe9Cr1Mo steel are deduced, through advanced characterisation and modelling. Degradation at 600 °C/∼42 bar CO2 for ∼20,000 h is emphasised: conditions relevant to components such as the finned superheater tubes used for advanced gas-cooled nuclear reactors. It is shown that such conditions are sufficient to cause carbon saturation of the metallic substrate, as confirmed by direct observation of extensive carbide precipitation but also numerical analysis of the carbon transport. Thus the observation of graphite precipitation close to the scale/metal interface is rationalised. Nonetheless, the activity of carbon at the scale/metal interface does not reach unity – with respect to graphite – at time zero. A modelling method is proposed which accounts for this kinetic retardation of the attack; this can be used to interpolate across the regimes within which breakaway oxidation is prevalent. It is a plausible model for extrapolation to the lower temperatures relevant to service conditions and is suitable for lifetime estimation – so-called ‘remnant life analysis’ – of such safety-critical components when prone to this form of attack.

Place, publisher, year, edition, pages
Elsevier Ltd , 2017. Vol. 130, 361-374 p.
Keyword [en]
Breakaway, Carburisation, Characterisation, Modelling, Oxidation, Carbides, Gas cooled reactors, Graphite, Models, Nuclear reactors, Safety engineering, Substrates, Superheater tubes, Break-away oxidation, Carbide precipitation, Gas cooled nuclear reactors, Graphite precipitation, Safety critical components, Carbon dioxide
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-207482DOI: 10.1016/j.actamat.2017.02.034ISI: 000401388700033Scopus ID: 2-s2.0-85016516026OAI: oai:DiVA.org:kth-207482DiVA: diva2:1108021
Note

Export Date: 22 May 2017; Article; Correspondence Address: Reed, R.C.; Department of Materials, University of Oxford, Parks Road, United Kingdom; email: roger.reed@eng.ox.ac.uk; Funding details: CSC, China Scholarship Council; Funding details: EP/J013501/1, EPSRC, Engineering and Physical Sciences Research Council; Funding text: The authors kindly thank EDF Energy Nuclear Generation Limited, UK for the provision of funding, TGA data and experimental specimens, China Scholarship Council (CSC) for the provision of funding, Amec Foster Wheeler for the experimental support, J. Sumner and N.J. Simms (Cranfield University) for the provision of oxide dimensions. EPSRC is kindly acknowledged for financial support under the grant EP/J013501/1. QC 20170612

Available from: 2017-06-12 Created: 2017-06-12 Last updated: 2017-06-12Bibliographically approved

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