Abstract
The isothermal oxidation behavior at 1000, 1050 and 1100°C and the cyclic oxidation behavior at 1000°C of the directionally solidified Ni-base superalloy DS951 were investigated. The oxidized samples were characterized by SEM, EDAX, XRD. The alloy DS951 obeyed a two-stage parabolic rate law during isothermal oxidation at 1000–1100°C. In cyclic conditions, the alloy showed no weight loss even after 1100 cycles. Cross-sectional examination revealed the development of faceted and needle-shaped AlN precipitates in the alloy subsurface region during cyclic oxidation, while no internal corrosion products were found in isothermal tests. Furthermore, a selective oxidation of MC carbides (M was predominately niobium with some chromium and tungsten) was observed along alloy grain boundaries and in interdendritic areas.
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Huang, L., Sun, X.F., Guan, H.R. et al. Oxidation Behavior of the Directionally Solidified Ni-base Superalloy DS951 in Air. Oxid Met 64, 303–318 (2005). https://doi.org/10.1007/s11085-005-8529-1
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DOI: https://doi.org/10.1007/s11085-005-8529-1