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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 |
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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.
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Received: 07 April 2024
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Fund: National Basic Research Program of China(2021YFB3704000) |
Corresponding Authors:
LIU Zhongwu, Tel: (020)22236906, E-mail: zwliu@scut.edu.cn
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