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Chinese Journal of Materials Research  2025, Vol. 39 Issue (3): 172-184    DOI: 10.11901/1005.3093.2024.165
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High Temperature Oxidation of a HIPed Nickel-based Superalloy
ZHONG Weijie1, JIAO Dongling1, LIU Zhongwu1(), LIU Na2, XU Wenyong2, LI Zhou2, ZHANG Guoqing2
1.School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
2.Science and Technology on Advanced High-Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
Cite this article: 

ZHONG Weijie, JIAO Dongling, LIU Zhongwu, LIU Na, XU Wenyong, LI Zhou, ZHANG Guoqing. High Temperature Oxidation of a HIPed Nickel-based Superalloy. Chinese Journal of Materials Research, 2025, 39(3): 172-184.

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Abstract  

A Ni-based alloy Ni-(12~18) Cr, (10~14) Co, (2~6) W, (2~6) Mo, (2~6) Ti, (2~6) Al was prepared via hot isostatic pressing by 150 MPa at 1150 oC with its argon gas atomization powders as raw material. Then its oxidation behavior in air at 950 oC was studied by intermittent weighing method in terms of the oxidation kinetics, phase composition, microstructure and elemental distribution of oxide scale and characteristics of oxygen-affected zone etc. The results show that the oxidation resistance of the as-HIPed superalloy at 950 oC has reached the full oxidation resistance grade in accord with the national standards. Both the oxidation kinetics curve and the depth variation curve of oxygen-affected zone follow a parabolic law. In the early stage of oxidation, Ti and Al atoms in the matrix diffuse rapidly along the prior particle boundaries (PPB) towards the alloy surface and form a continuous mixed oxide layer of Cr2O3, TiO2 and Al2O3. However, oxygen atoms diffuse inward along the PPB and undergoes in-situ oxidation reaction with secondary phases to form granular internal oxide Al2O3. After 24 hours oxidation, the surface oxide scale consists of the outmost layer of mixed oxides TiO2 and Al2O3, and the inner layer of Cr2O3 oxide. The continuous internal oxides TiO2 and Al2O3 appear in Cr-depleted zone. In the later stage of oxidation (> 100 h), the outmost TiO2 oxide layer peels off from the alloy surface, and the internal oxides TiO2 and Al2O3 distributed in Cr-depleted zone in a continuous root-like manner. Finally, the high temperature oxidation mechanism and formation process of internal oxides in as-HIPed nickel-based superalloy was also discussed.

Key words:  metallic materials      high temperature oxidation      hot isostatic pressing      nickel-based superalloy      microstructure     
Received:  07 April 2024     
ZTFLH:  TG132.32  
Fund: National Basic Research Program of China(2021YFB3704000)
Corresponding Authors:  LIU Zhongwu, Tel: (020)22236906, E-mail: zwliu@scut.edu.cn

URL: 

https://www.cjmr.org/EN/10.11901/1005.3093.2024.165     OR     https://www.cjmr.org/EN/Y2025/V39/I3/172

Fig.1  Isothermal oxidation kinetics curve and average oxidation rate (a), and relationship between weight gain per unit area and time (b) of as-HIPed superalloy at 950 oC
Fig.2  Metallographic morphology of oxygen-affected zone in as-HIPed superalloy oxidized at 950 oC for different time
Fig.3  Thickness of oxygen-affected zone in as-HIPed superalloy oxidized at 950 oC for different time
Fig.4  Grazing incidence XRD patterns of as-HIPed superalloy oxidized at 950 oC for different time
Fig.5  Surface micromorphology of as-HIPed superalloy oxidized at 950 oC for different time
Fig.6  Surface oxide layer characteristics of as-HIPed superalloy oxidized at 950 oC for different time
Fig.7  Element distribution of surface oxide layer of as-HIPed superalloy oxidized at 950 oC
Fig.8  Microstructure and element distribution of cross-sections in the early oxidation stage (0~100 h) at 950 oC for as-HIPed superalloy
Fig.9  Microstructure and element distribution of cross-sections in the later oxidation stage (> 100 h) at 950 oC for as-HIPed superalloy
Fig.10  Relationship between Gibbs free energy and temperature for the oxidation reaction of Cr, Ti and Al in superalloy
Fig.11  DSC curve of superalloy (a), and corrosion mor-phology of unoxidized HIPed superalloy (b)
Fig.12  Microstructure and element distribution of internal oxides in as-HIPed superalloy after oxidation for 400 h at 950 oC
Fig.13  Phase transformation and internal oxidation process of as-HIPed superalloy after oxidation at 950 oC
Fig.14  Cross-sectional diagrams of oxidation process of as-HIPed superalloy at 950 oC
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