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| Oxidation Behavior of a Low-cost 3rd-gerneration Ni-based Single Crystal Superalloy containing 3 wt.% Re |
LI Yongmei 1,2, TAN Zihao 1,2,
WANG Xinguang 2, TAO Xipeng 2, YANG Yanhong 2,
LIU Jide 2, LIU Jinlai 2, LI Jiguo 2, ZHOU
Yizhou 2, SUN Xiaofeng 2
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1 University of Science and Technology of China,
Shenyang 110016, China
2
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016,
China |
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Abstract In order to address the practical problem of the increasing cost of advanced aero-engines, there is an urgent need to develop low-cost Ni-based SX superalloys with excellent properties. In this work, a novel low-cost, third-generation Ni-based SX superalloy was investigated to assess its oxidation behavior and γ′ phase degradation at 1120 °C. The results show that during the first 5 h of oxidation, a continuous and uniform three-layer oxide film was formed on the surface of samples, which followed the sub-parabolic kinetics as the oxide film is sufficiently thin. During the oxidation between 10-100 h, the nucleation and propagation of cracks in Al2O3 interlayer accelerated the spallation of protective oxide film, leading to increased oxidation of matrix alloy, along with the formation of AlN and large areas of ORD zone. After 150 h of oxidation, a continuous and zigzagging Al2O3 layer were formed at the bottom of the ORD zone, which could effectively hinder the outward diffusion of alloy elements and the inward diffusion of oxygen, with the alloy gradually approaching parabolic kinetics as the Al2O3 layer was thickened. Moreover, the intense oxidation reaction on the surface would accelerate the degradation of γ′ phase and the precipitation of the TCP phase near the surface. Summarily, the low bond strength between the surface oxide film and the alloy matrix primarily contributed to the deficiency of high-temperature oxidation resistance of this experimental alloy. In the future, the improvement of oxidation resistance of this new low-cost third-generation Ni-based SX superalloy can be achieved by adding trace amounts of Hf, Y and La elements.
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Received: 03 July 2023
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| Fund: Excellent Youth Foundation of Liaoning Province;Middle-aged and Youth Talents in Scientific and Technological Innovation Project of Shenyang |
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