Oxidation Behavior of Micro-Regions in Multiphase Ni3Al-Based Superalloys
HU Min, ZHOU Shengyu, GUO Jingyuan, HU Minghao, LI Chong(), LI Huijun, WANG Zumin, LIU Yongchang
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science and Engineering, Tianjin University, Tianjin 300354, China
Cite this article:
HU Min, ZHOU Shengyu, GUO Jingyuan, HU Minghao, LI Chong, LI Huijun, WANG Zumin, LIU Yongchang. Oxidation Behavior of Micro-Regions in Multiphase Ni3Al-Based Superalloys. Acta Metall Sin, 2023, 59(10): 1346-1354.
Ni3Al-based superalloys are widely used in aero-engine parts. In addition to having a good temperature bearing capacity, the oxidation resistance of the alloy is also high. In this work, a multiphase Ni3Al-based superalloy was selected as the experimental material. Three micro-regions (γ' + γ dendrite, interdendritic β phase, and γ' envelope) containing different phases were obtained by heat treatment. The isothermal oxidation behavior of the micro-regions was studied under 1000oC, where the three micro-regions exhibited different oxidation behaviors at the initial stage of oxidation. The γ' envelope has an obvious double-layer oxide scale showing a cellular bulge. The outer layer is a mixed layer (NiO, NiFe2O4, and Al2O3), and the inner layer is a single Al2O3 layer. However, the γ' + γ dendrite and the interdendritic β phase form a single layer of the Al2O3 film. With increasing isothermal oxidation time, the oxide scale composition of the three micro-regions gradually tends to be the same, forming a dense single Al2O3 layer.
Fund: National Natural Science Foundation of China(51774212);National Natural Science Foundation of China(52122409);Natural Science Foundation of Tianjin City(20JCYBJC00950)
Corresponding Authors:
LI Chong, professor, Tel: 13021398676, E-mail: lichongme@tju.edu.cn
Fig.1 SEM image of the Ni3Al-based superalloy after heat treatment, showing γ' + γ dendrite, interdendritic β phase, and γ' envelope (a); a higher magnification SEM image of interdendritic β phase and γ' envelope (b); a higher magnification SEM image of γ' + γ dendrite, showing cubic γ' precipitates separated by γ channels (c)
Position in Fig.1b
Al
Fe
Cr
Ni
1 (γ' + γ dendrite)
8.5
18.6
12.4
60.5
2 (interdendritic β phase)
27.2
8.9
1.5
62.4
3 (γ' envelope)
19.4
6.6
2.2
71.8
Table 1 EDS results of chemical compositions of different regions in Ni3Al-based superalloy
Fig.2 Surface SEM image of the Ni3Al-based superalloy oxidized at 1000oC for 10 min (a) and higher magnification surface SEM images of interdendritic β phase and γ' envelope (b), interdendritic β phase (c), and γ' + γ dendrite (d)
Fig.3 Low (a, c) and high (b, d) magnified surface SEM images of the Ni3Al-based superalloy oxidized at 1000oC for 30 h (a, b) and 100 h (c, d)
Fig.4 XRD spectra of the Ni3Al-based superalloy oxidized at 1000oC for 10 min and 100 h
Fig.5 Raman spectra of surface oxide scales in different regions of the Ni3Al-based superalloy oxidized at 1000oC for 10 min (a) and 100 h (b)
Fig.6 Auger electron spectrum (AES) element-depth profiles of Ni3Al-based superalloy oxidized at 1000oC for 10 min (a) γ' + γ dendrite (b) interdendritic β phase (c) γ' envelope
Fig.7 Cross-sectional TEM image of γ' + γ dendrite oxidized at 1000oC for 10 min (a) and the EDS element mapping of the frame area depicting the distributions of elements O (b), Al (c), Cr (d), Fe (e), and Ni (f) (Inset in Fig.7a shows the selected area electron diffraction (SAED) pattern of γ' + γ dendrite)
Fig.8 Cross-sectional TEM image of interdendritic β phase oxidized at 1000oC for 10 min (a) and the EDS element mapping of the frame area depicting the distributions of elements O (b), Al (c), Cr (d), Fe (e), and Ni (f) (Inset in Fig.8a shows the SAED pattern of interdendritic β phase)
Fig.9 Cross-sectional TEM image of γ' envelope oxidized at 1000oC for 10 min (a) and the corresponding EDS element mapping depicting the distributions of elements O (b), Al (c), Cr (d), Fe (e), and Ni (f) (Inset in Fig.9a shows the SAED pattern of γ' envelope, and the rectangular frames in Fig.9a show the holes)
Fig.10 Cross-sectional SEM-BSE image of Ni3Al-based superalloy oxidized at 1000oC for 30 h (a) and the corresponding EDS element mapping depicting the distributions of elements O (b), Al (c), and Ni (d)
Fig.11 Cross-sectional SEM-BSE image of Ni3Al-based superalloy oxidized at 1000oC for 100 h (a) and the corresponding EDS element mapping depicting the distributions of elements O (b), Al (c), and Ni (d)
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