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Microstructural homogenization and high-temperature cyclic oxidation behavior of a Ni-based superalloy with high-Cr content.
- Source :
-
Journal of Alloys & Compounds . Dec2017, Vol. 727, p410-418. 9p. - Publication Year :
- 2017
-
Abstract
- A new Ni-based superalloy with high-Cr content was designed for industrial gas turbines application. The microstructural homogenization and high-temperature cyclic oxidation behavior was investigated systematically. The results showed that the optimum heat treatment condition was 1563 K (1290 °C)/4 h + 1573 K (1300 °C)/6 h, A.C. (air cooling) + 1393 K (1120 °C)/2 h, A.C. + 1143 K (870 °C)/24 h, A.C., which can completely dissolve the γ/γ′ eutectic and the Ni 3 (TiTa) phase in the interdendritic region. The cyclic oxidation results showed that a multilayer of continuous and dense oxide-rich regions formed and the kinetic curves followed a parabolic law. The mass gain at 1323 K (1050 °C) and 1343 K (1070 °C) was 4.02 mg/cm 2 and 4.23 mg/cm 2 , respectively. No severe spallation of the oxide-rich region was observed. The outer layer of the oxide-rich region mainly consisted of Cr 2 O 3 , TiO 2 , and (Ni, Co)Cr 2 O 4 spinels, while the layer at the substrate-oxide interface was found to be Al 2 O 3 . The results show that this new superalloy has a better cyclic oxidation resistance at 1343 K (1070 °C) than the commonly used IN738 and GTD-111 superalloys. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 727
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 125546387
- Full Text :
- https://doi.org/10.1016/j.jallcom.2017.08.137