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001008450 1001_ $$0P:(DE-Juel1)186091$$aAarab, Fadoua$$b0$$eCorresponding author$$ufzj
001008450 245__ $$aDevelopment of Self-Passivating, High-Strength Ferritic Alloys for Concentrating Solar Power (CSP) and Thermal Energy Storage (TES) Applications
001008450 260__ $$aBasel$$bMDPI$$c2023
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001008450 520__ $$aConcentrating solar power (CSP) and thermal energy storage (TES) based on molten salts still lacks economic feasibility, with the material investment costs being a major drawback. Ferritic stainless steels are a comparatively cheap class of materials that could significantly contribute to cost reductions. The addition of aluminum to ferritic steel can result in self-passivation by forming a compact Al2O3 top layer, which exhibits significantly higher corrosion resistance to solar salt compared to the Cr2O3 surface layers typically formed on expensive structural alloys for CSP and TES, such as austenitic stainless steels and Ni-base super alloys. However, to date, no ferritic stainless steel combining Al2O3 formation and sufficient structural strength is available. For this reason, cyclic salt corrosion tests under flowing synthetic air were carried out on seven Laves phase-forming, ferritic model alloys (17Cr2-14Al0.6-1Nb2.6-4W0.25Si), using “solar salt” (60 wt. % NaNO3 and 40 wt. % KNO3). The Al content was varied to investigate the influence on the precipitation of the mechanically strengthening Laves phase, as well as the impact on the formation of the Al-oxide top layer. The W and Nb contents of the alloys were increased to examine their influence on the precipitation of the Laves phase. The salt corrosion experiments demonstrated that simultaneous self-passivation against a molten salt attack and mechanical strengthening by precipitation of fine Laves phase particles is possible in novel ferritic HiperFerSCR (salt corrosion-resistant) steel. Microstructural examination unveiled the formation of a compact, continuous Al2O3 layer on the surface of the model alloys with Al contents of 5 wt. % and higher. Furthermore, a stable distribution of fine, strengthening Laves phase precipitates was achieved in the metal matrix, resulting in a combination of molten salt corrosion resistance and potentially high mechanical strength by a combination of solid solution and precipitation strengthening. These results show that high-strength ferritic alloys are suitable for use in CSP applications
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001008450 536__ $$0G:(BMWi)03EE5048D$$aVerbundvorhaben STERN: Steigerung der Kosteneffizienz von Flüssigsalzreceivern; Teilvorhaben: Entwicklung und Qualifizierung von Werkstoffen für Solarreceiver (03EE5048D)$$c03EE5048D$$x1
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001008450 7001_ $$0P:(DE-Juel1)129742$$aKuhn, Bernd$$b1
001008450 773__ $$0PERI:(DE-600)2437446-5$$a10.3390/en16104084$$gVol. 16, no. 10, p. 4084 -$$n10$$p4084 -$$tEnergies$$v16$$x1996-1073$$y2023
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