期刊
CORROSION SCIENCE
卷 223, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2023.111464
关键词
A. Ni-based superalloys; B. TEM; EPMA; Weight loss; C. High-temperature corrosion; Oxidation
This study provides new insights into the Ru-effects on the oxidation resistance of some fourth-generation single-crystal Ni-based superalloys at 1150 degrees C. Ru additions were found to decrease the oxidation resistance of the alloys due to the formation of micro-pores and cracks in the oxide scale, despite inhibiting the precipitation of undesirable TCP phases.
This study provides new insights into Ru-effects on the oxidation resistance of some fourth-generation singlecrystal Ni-based superalloys at 1150 degrees C. No apparent evaporation of Ru-oxides was observed. On the contrary, HCP-structured Ru-Re solid solution ((Ru,Re)ss) particles were found to be embedded in the oxide scale for the Ru-added alloys. Local evaporation of Re-oxides from the (Ru,Re)ss particles, as well as the internal stress at their boundaries, gives birth to micro-pores and cracks and increased the spallation of oxide scales upon cooling. Despite the inhibition of undesirable TCP phase precipitation, Ru additions degrade the high-temperature oxidation resistance of the alloys considerably.
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