Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 15: Poster Session
MM 15.2: Poster
Montag, 11. März 2013, 18:00–20:00, Poster E
Grain boundary chemistry in nickel alloys applied in 700∘ C coal-power plant — •Miriam Magdalena Lange1, Sergiy Borodin1, Michael Spiegel2, and Frank Uwe Renner1 — 1Max-Planck-Institut für Eisenforschung GmbH, Department for Interface Chemistry and Surface Engineering, Düsseldorf, Germany — 2Salzgitter Mannesmann Forschung GmbH, Duisburg, Germany
Nickel-based alloys are highly interesting materials for application in the new technology of 700∘C coal-power plants. Compared to conventional power plants the temperature is increased from 600∘C to 700∘C at a pressure of 350 bar. During first tests under flue gas atmosphere and pressurized steam the nickel-based alloys showed significant grain boundary sulfidation. The grain boundary chemistry before and after sulfidation under high-temperature working conditions of specific variants of Alloy 617 and corresponding model casts have been investigated by means of Auger Electron Spectroscopy (AES), accompanied by conventional surface analysis. Understanding the mechanisms of grain boundary sulfidation as a result of a specific grain boundary chemistry of these materials can help to improve their corrosion resistance by grain boundary engineering. Initial results on the investigation of grain boundary chemistry of Alloy 617 before and after sulfidation will be presented.