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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Ainsworth, Robert
University of Manchester
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (9/9 displayed)
- 2019A numerical model to simulate ductile tearing-creep crack growth interactioncitations
- 2018The creep clauses of BS7910citations
- 2018Factors Affecting the Oxidation and Carburisation Behaviour of an Austenitic Stainless Steel Used in the UK Advanced Gas-Cooled Reactorscitations
- 2017A transferability approach for reducing excessive conservatism in fracture assessmentscitations
- 2017Residual stress measurement round robin on an electron beam welded joint between austenitic stainless steel 316L(N) and ferritic steel P91citations
- 2016Fatigue Life Estimation of Pitted Specimens by Means of an Integrated Fracture Mechanics Approachcitations
- 2016Design and Assessment for Creep-Fatigue and Creep-Fatigue Crack Growth
- 2016Application of failure assessment diagram methods to cracked straight pipes and elbowscitations
- 2016Blunt defect assessment in the framework of the failure assessment diagramcitations
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document
Factors Affecting the Oxidation and Carburisation Behaviour of an Austenitic Stainless Steel Used in the UK Advanced Gas-Cooled Reactors
Abstract
A significant number of stainless steel components within the boilers of the UK advanced gas-cooled reactor (AGR) plants are subjected to oxidation, carburisation and other changes in the underlying microstructure of the material during operation. This results from exposure to the pressurised CO2-based primary circuit coolant at temperatures from about 500 to 650°C. It is believed that there is a synergistic relationship between the pressurised CO2 coolant environment and creep-fatigue initiation and cracking. Devising and implementing an evaluation methodology to account for oxidation and carburisation to enable conservative lifetime assessments is essential to manage plant lifetime. Therefore, the development of a new and fundamental understanding of environmentally assisted degradation and failure mechanisms is required. It has been postulated that the mechanism underlying the initiation of cracks is carburisation associated with the presence of a duplex oxide layer. In this study, the material-environment interaction for Type 316H stainless steel under simulated AGR conditions has been investigated to increase the understanding of the combined effects of stress, strain and surface preparation, for example, on oxidation and cracking behavior. Experimental data are presented which show that a work hardened surface layer (surface grinding) promotes the formation of a thin, protective oxide scale, which does not protrude along the grain boundaries, whereas a surface polished with an oxide dispersion solution (OPS) leads to the formation of thick duplex oxide layers as well as intergranular oxide penetration. Furthermore, an increased surface hardness due to carburisation has been observed for the polished surface only, suggesting that carburisation occurs at an early stage on a chemically polished (OPS) surface. It is found that when the substrate is plastically deformed and under the effect of active stress, the thin oxide on the work hardened (abraded) surface can be disrupted, resulting in similar behaviour to a chemically polished surface.