Isothermal oxidation behavior and mechanism of a nickel-based superalloy at 1000℃

Zhi-yuan Zhu; Yuan-fei Cai; You-jun Gong; Guo-ping Shen; Yu-guo Tu; Guo-fu Zhang

doi:10.1007/s12613-017-1461-y

Volume 24 Issue 7

Jul. 2017

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文章导航 > 矿物冶金与材料学报（英文） > 2017 > 24(7): 776-783

Zhi-yuan Zhu, Yuan-fei Cai, You-jun Gong, Guo-ping Shen, Yu-guo Tu, and Guo-fu Zhang, Isothermal oxidation behavior and mechanism of a nickel-based superalloy at 1000℃, Int. J. Miner. Metall. Mater., 24(2017), No. 7, pp. 776-783. https://doi.org/10.1007/s12613-017-1461-y

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Zhi-yuan Zhu, Yuan-fei Cai, You-jun Gong, Guo-ping Shen, Yu-guo Tu, and Guo-fu Zhang, Isothermal oxidation behavior and mechanism of a nickel-based superalloy at 1000℃, Int. J. Miner. Metall. Mater., 24(2017), No. 7, pp. 776-783. https://doi.org/10.1007/s12613-017-1461-y

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研究论文

Isothermal oxidation behavior and mechanism of a nickel-based superalloy at 1000℃

School of Material Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
Technology Center, Jiangsu Shenyuan Special Steel Co., Ltd., Xinghua 225722, China

通讯作者:
Zhi-yuan Zhu E-mail: salanganezhu@163.com

中文摘要

The oxidation behavior of a nickel-based superalloy at 1000℃ in air was investigated through X-ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy analysis. A series of oxides, including external oxide scales (Cr₂O₃, (TiO₂ + MnCr₂O₄)) and internal oxides (Al₂O₃,TiN), were formed on the surface or sub-surface of the substrate at 1000℃ in experimental still air. The oxidation resistance of the alloy was dependent on the stability of the surface oxide layer. The continuity and density of the protective Cr₂O₃ scale were affected by minor alloying elements such as Ti and Mn. The outermost oxide scale was composed of TiO₂ rutile and MnCr₂O₄ spinel, and the growth of TiO₂ particles was controlled by the outer diffusion of Ti ions through the pre-existing oxide layer. Severe internal oxidation occurred beneath the external oxide scale, consuming Al and Ti of the strength phase γ' (Ni₃(Al,Ti)) and thereby severely deteriorating the surface mechanical properties. The depth of the internal oxidation region was approximately 35 μm after exposure to experimental air at 1000℃ for 80 h.

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Research Article

Isothermal oxidation behavior and mechanism of a nickel-based superalloy at 1000℃

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Abstract

Abstract

The oxidation behavior of a nickel-based superalloy at 1000℃ in air was investigated through X-ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy analysis. A series of oxides, including external oxide scales (Cr₂O₃, (TiO₂ + MnCr₂O₄)) and internal oxides (Al₂O₃,TiN), were formed on the surface or sub-surface of the substrate at 1000℃ in experimental still air. The oxidation resistance of the alloy was dependent on the stability of the surface oxide layer. The continuity and density of the protective Cr₂O₃ scale were affected by minor alloying elements such as Ti and Mn. The outermost oxide scale was composed of TiO₂ rutile and MnCr₂O₄ spinel, and the growth of TiO₂ particles was controlled by the outer diffusion of Ti ions through the pre-existing oxide layer. Severe internal oxidation occurred beneath the external oxide scale, consuming Al and Ti of the strength phase γ' (Ni₃(Al,Ti)) and thereby severely deteriorating the surface mechanical properties. The depth of the internal oxidation region was approximately 35 μm after exposure to experimental air at 1000℃ for 80 h.
- nickel-based superalloy;
- isothermal oxidation;
- oxide scale;
- internal oxidation

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Isothermal oxidation behavior and mechanism of a nickel-based superalloy at 1000℃

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Isothermal oxidation behavior and mechanism of a nickel-based superalloy at 1000℃

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