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- Title
ISOTHERMAL OXIDATION BEHAVIOR OF THE DIRECTIONALLY SOLIDIFIED Ni-BASED SUPERALLOY DZ951 AT 900, 1000 AND 1100°C.
- Authors
HUANG, L.; GUAN, H. R.; SUN, X. F.; WANG, Y. L.
- Abstract
The isothermal oxidation behavior of directionally solidified Ni-base superalloy DZ951 at 900, 1000 and 1100°C were investigated. Oxidized alloy was characterized by SEM, EDAX, XRD. A subparabolic time dependence (n = 0.18 at 900°C and n = 0.08 at 1000°C) of the oxide growth rate was determined at relatively low temperature, while alloy nearly followed parabolic law at 1100°C (n = 0.42). The severe composition segregation, which resulted from the solidification process, led to the formation of different scale on the dendritic and interdendritic regions at 900°C, however, this difference disappeared after oxidation at 1000 and 1100°C for long time. Furthermore, faceted and needle-shaped AlN precipitates developed in the alloy subsurface region after oxidation at 1100°C for 200h, while no internal corrosion products were found in 900 and 1000°C tests.
- Subjects
THERMAL properties of alloys; HEAT resistant alloys; NICKEL alloys; OXIDATION; THERMOGRAVIMETRY; DYNAMICS
- Publication
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics, 2006, Vol 20, Issue 25-27, p3587
- ISSN
0217-9792
- Publication type
Article
- DOI
10.1142/S0217979206040039