| 1. |
- Adile, E., et al.
(författare)
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Cladding of components in UNS N08810 alloy exposed to molten lead by GMAW and SAW processes, adopting an innovative Fe-Cr-Al based consumable, in the green power sector
- 2021
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Ingår i: Rivista Italiana della Saldatura. - : Instituto Italiano della Saldatura. - 0035-6794. ; 73:1, s. 27-47
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Tidskriftsartikel (refereegranskat)abstract
- This study reports the results obtained from the welding tests carried out within the European project H2020 "NEXTOWER", which aims to create a demonstration plant with concentrated energy (CSP) and high efficiency solar tower, based on the use of liquid lead as an energy storage element. In particular, the study focuses on the development phases of the robotic GMAW and strip cladding SAW welding procedures, to create defect-free coatings on Incoloy® 800H components adopting an innovative Fe-Cr-Al-based consumable, specially developed by Sandvik Kanthal. The paper illustrates the operational and metallurgical aspects associated with the use of the Fe-Cr-Al consumable, evaluating the effect of the different process parameters, as well as any heat treatments, on the mechanical and microstructural properties of the joints. The laboratory test results were compared with the qualification paths required by ASME and EN reference standards.
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| 2. |
- Ejenstam, J., et al.
(författare)
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Microstructural stability of Fe-Cr-Al alloys at 450-550 degrees C
- 2015
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Ingår i: Journal of Nuclear Materials. - : Elsevier BV. - 0022-3115. ; 457, s. 291-297
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Tidskriftsartikel (refereegranskat)abstract
- Iron-Chromium-Aluminium (Fe-Cr-Al) alloys have been widely investigated as candidate materials for various nuclear applications. Albeit the excellent corrosion resistance, conventional Fe-Cr-Al alloys suffer from alpha-alpha' phase separation and embrittlement when subjected to temperatures up to 500 degrees C, due to their high Cr-content. Low-Cr Fe-Cr-Al alloys are anticipated to be embrittlement resistant and provide adequate oxidation properties, yet long-term aging experiments and simulations are lacking in literature. In this study, Fe-10Cr-(4-8)Al alloys and a Fe-21Cr-5Al were thermally aged in the temperature interval of 450-550 degrees C for times up to 10,000 h, and the microstructures were evaluated mainly using atom probe tomography. In addition, a Kinetic Monte Carlo (KMC) model of the Fe-Cr-Al system was developed. No phase separation was observed in the Fe-10Cr-(4-8)Al alloys, and the developed KMC model yielded results in good agreement with the experimental data.
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| 3. |
- Lambrinou, K., et al.
(författare)
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Corrosion-resistant ternary carbides for use in heavy liquid metal coolants
- 2016
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Ingår i: Ceramic Engineering and Science Proceedings. - 9781119040439 ; , s. 19-34
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Konferensbidrag (refereegranskat)abstract
- A primary concern in the development of accelerator-driven systems (ADS) with liquid leadbismuth eutectic (LBE) spallation target and Gen-IV lead-cooled fast reactors (LFRs) is the compatibility of the candidate structural steels with the heavy liquid metal (HLM) coolant In the accelerator-driven system MYRRHA, the envisaged primary coolant is liquid LBE, a potentially corrosive environment for various nuclear grade steels. The inherent LBE corrosiveness is the driving force behind diverse research incentives aiming at the development of corrosion-resistant materials for specific applications. I3ue to their superb corrosion resistance in contact with liquid LBE, MAX phases are currently being assessed as candidate materials for the construction of pump impellers suitable for MYRRHA and Gen-IV LFRs. In the case of the MYRRHA nuclear system, the pump impeller will be called to operate reliably at ∼270°C in contact with moderately-oxygenated (concentration of dissolved oxygen: [O] ≥ 7×10-7 mass%), fast-flowing LBE (LBE flow velocity: v ≈ 10-20 m/s locally on the impeller surface). Selected MAX phases are currently being screened with respect to their capability of meeting the targeted material property requirements, especially the enhanced erosion resistance requested by this particular application. This work gives a state-of-the-art overview of the processing and characterisation of selected MAX phases that are screened as candidate structural materials for the MYRRHA pump impeller. All considered MAX phases were produced via a powder metallurgical route and their performance was assessed by various mechanical tests in air/vacuum and corrosion/erosion tests in liquid LBE.
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