High temperature oxidation behavior of a novel Ni-Cr-W-Al-Ti superalloy
Oxidation of a novel Ni-19Cr-17W-2Al-0.5 Ti superalloy was investigated in air at 800–1100°
C. In spite of the local spallation of external oxide scale after prolonged oxidation at high
temperature, the alloy maintains excellent oxidation resistance. The excellent oxidation
resistance is related to continuous external Ti-rich oxide covering on Cr 2 O 3 scale, which
inhibits, at least to a certain degree, the evaporation of Cr 2 O 3. In addition, this can also be
ascribed to the fine Al 2 O 3 particles along grain boundaries of alloy matrix, which plays a …
C. In spite of the local spallation of external oxide scale after prolonged oxidation at high
temperature, the alloy maintains excellent oxidation resistance. The excellent oxidation
resistance is related to continuous external Ti-rich oxide covering on Cr 2 O 3 scale, which
inhibits, at least to a certain degree, the evaporation of Cr 2 O 3. In addition, this can also be
ascribed to the fine Al 2 O 3 particles along grain boundaries of alloy matrix, which plays a …
Abstract
Oxidation of a novel Ni-19Cr-17W-2Al-0.5Ti superalloy was investigated in air at 800–1100 °C. In spite of the local spallation of external oxide scale after prolonged oxidation at high temperature, the alloy maintains excellent oxidation resistance. The excellent oxidation resistance is related to continuous external Ti-rich oxide covering on Cr2O3 scale, which inhibits, at least to a certain degree, the evaporation of Cr2O3. In addition, this can also be ascribed to the fine Al2O3 particles along grain boundaries of alloy matrix, which plays a key role in inhibiting the inward O diffusion and outward Cr diffusion through grain boundary.
Elsevier
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