Abstract
Co-Ni-based superalloys are known for their capability to function at elevated temperatures and superior hot corrosion and thermal fatigue resistance. Therefore, these alloys show potential as crucial high-temperature structural materials for aeroengine and gas turbine hot-end components. Our previous work elucidated the influence of Ti and Ta on the high-temperature mechanical properties of alloys. However, the intricate interaction among elements considerably affects the oxidation resistance of alloys. In this paper, Co-35Ni-10Al-2W-5Cr-2Mo-1Nb-xTi-(5–x)Ta alloys (x = 1, 2, 3, 4) with varying Ti and Ta contents were designed and compounded, and their oxidation resistance was investigated at the temperature range from 800 to 1000° After oxidation at three test conditions, namely, 800°C for 200 h, 900°C for 200 h, and 1000°C for 50 h, the main structure of the oxide layer of the alloy consisted of spinel, Cr2O3, and Al2O3 from outside to inside. Oxides consisting of Ta, W, and Mo formed below the Cr2O3 layer. The interaction of Ti and Ta imparted the highest oxidation resistance to 3Ti2Ta alloy. Conversely, an excessive amount of Ti or Ta resulted in an adverse effect on the oxidation resistance of the alloys. This study reports the volatilization of W and Mo oxides during the oxidation process of Co-Ni-based cast superalloys with a high Al content for the first time and explains the formation mechanism of holes in the oxide layer. The results provide a basis for gaining insights into the effects of the interaction of alloying elements on the oxidation resistance of the alloys they form.
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Acknowledgements
This work was financially supported by the National Major Science and Technology Projects of China (Nos. J2019-VII-0010-0150 and J2019-VI-0009-0123), National Natural Science Foundation of China (Nos. 52022011 and 520900 41), Beijing Nova Program (No. Z211100002121170), Science Center for Gas Turbine Project (No. P2021-A-IV-001-002), Science and Technology on Advanced High Temperature Structural Materials Laboratory (No. 6142903210306), and Xiaomi Young Scholars Program.
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Jianxin Xie is an editorial board member for this journal and not involved in the editorial review or the decision to publish this article. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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Zhang, Y., Li, Z., Gui, Y. et al. Effect of Ti and Ta content on the oxidation resistance of Co-Ni-based superalloys. Int J Miner Metall Mater 31, 351–361 (2024). https://doi.org/10.1007/s12613-023-2733-3
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DOI: https://doi.org/10.1007/s12613-023-2733-3