Oxidation of boiler steels - RWTH Aachen University

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7 th GTT-Workshop, May 2005 UNIVERSITÄT SIEGEN Oxide scale NiO/TiO /Ni(Al,Cr) O 2 2 4 Cr 2O Al 2 O γ 3 3 ´-Phase Ni (Al,Ti,Ta) 3 500µm N2 N N metal diffusion Internal nitridation of Ni-base alloys Al 2 O3 AlN TiN NiCrAlTi-alloy dissolution of the Institut für Werkstofftechnik Lehrstuhl für Materialkunde und Werkstoffprüfung γ 200µm ´-phase (Krupp et al. ; Ox. Metals, 1999)
7 th GTT-Workshop, May 2005 CMSX-6 CMSX-2 SRR99 CMSX-4 Nimonic 105 Nicrofer 7520 Ti UNIVERSITÄT SIEGEN Monocrystal Ni-base superalloys Cr Al Ti Co Ta Mo W 9,6 4,7 4,6 4,8 1,8 2,8 0,1 7,9 5,6 1,0 8,5 5,6 2,2 5,2 2,8 0,06 9,5 Polycrystalline Ni-base alloys Cr Al Ti Co Ta Mo W 20,2 4,6 1,6 2,7 6,0 -- 0,6 -- 7,9 6,0 5,6 1,0 5,2 2,8 0,6 6,0 Internal nitridation of Ni-base alloys + 0,01%C + 3% Re 0,1%Hf 14,9 4,7 1,2 20 -- 5,0 -- -- Ni- base model alloys Institut für Werkstofftechnik Lehrstuhl für Materialkunde und Werkstoffprüfung -- NiTi2 NiTi6 NiCr10 NiCr20 NiCr30 binary NiCr5Ti2 NiCr10Ti2 NiCr20Ti2 NiCr30Ti2 NiCr20Ti6 NiCr20Al2 ternary NiCr10Al2Ti2 NiCr20Al2Ti2 NiCr20Al6Ti2 quaternary
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