Oxidation Behavior of the Nickel-Based Superalloy DZ125 at 980 °C

The isothermal oxidation behavior of the nickel-based superalloy DZ125 was investigated at 980 °C through SEM/EDX and XRD. The weight loss process exhibited three periods—initial, transient and steady stages, which correspond to the formation of three layers on the surface. The outer layer was compo...

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Bibliographic Details
Published in:Acta metallurgica sinica : English letters 2017-09, Vol.30 (9), p.857-862
Main Authors: Hu, Ye-Bing, Zhang, Li, Cheng, Cong-Qian, Zhao, Peng-Tao, Guo, Guang-Ping, Zhao, Jie
Format: Article
Language:English
Subjects:
Aluminum oxide
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Crack initiation
High temperature
Kinetics
Materials Science
Mechanical properties
Metallic Materials
Morphology
Nanotechnology
Nickel base alloys
Nickel oxides
Organometallic Chemistry
Oxidation
Scale (corrosion)
Single crystals
Spectroscopy/Spectrometry
Substrates
Superalloys
Tribology
Turbines
Weight loss
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Summary:The isothermal oxidation behavior of the nickel-based superalloy DZ125 was investigated at 980 °C through SEM/EDX and XRD. The weight loss process exhibited three periods—initial, transient and steady stages, which correspond to the formation of three layers on the surface. The outer layer was composed of NiO, whereas the intermediate layer mainly consisted of spinels and was accompanied with Ta-rich oxide. Alumina was evident as the inner continuous layer close to the substrate. The first formation of alumina was responsible for the initial stage of weight loss, and the formation of NiO and intermediate layer may dramatically affect on the transient and steady stage, respectively. The oxide scales effect on growth mechanism was discussed.
ISSN:1006-7191
2194-1289
DOI:10.1007/s40195-017-0598-z