Oxidation of boiler steels - RWTH Aachen University

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7 th GTT-Workshop, May 2005 • Theory of internal oxidation • Carburzation of Ni-Cr-model alloys and austenitic steels • Nitridation of Ni-base alloys • Oxidation of boiler steels • Computer modelling: - diffusion in MATLAB UNIVERSITÄT SIEGEN - MATLAB vs. CHEMAPP - Parallel Computing •Application of the developed simulation tool •Highlights - Carburization - Nitridation Institut für Werkstofftechnik Lehrstuhl für Materialkunde und Werkstoffprüfung Outline
7 th GTT-Workshop, May 2005 N-concentratinon [At.%] (soluble in the matrx) 0,003 0,0025 0,002 0,0015 0,001 0,0005 0 TiN N 0 100 200 300 400 500 UNIVERSITÄT SIEGEN NiCr20Ti2 1000°C Ni-20Cr-2Ti 200h 900°C Distance from surface [µm] Simulation of internal nitridation 3 2,5 2 1,5 1 0,5 0 thickness of nitridation [µm] Ti-/TiN-conc. [At.%] 300 250 200 150 100 50 0 Simulation results Ni-20Cr-2Ti 1000°C 0 2 4 6 8 10 12 14 16 18 square of time [h 1/2 ] Institut für Werkstofftechnik Lehrstuhl für Materialkunde und Werkstoffprüfung
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