一种具有优异高温组织稳定性，抗氧化性和力学性能的新型高Cr含量CoNi基高温合金

张晓瑞; 邹敏; 路松; 李龙飞; 庄晓黎; 冯强

doi:10.1007/s12613-024-2843-6

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Xiaorui Zhang, Min Zou, Song Lu, Longfei Li, Xiaoli Zhuang, and Qiang Feng, A novel high-Cr CoNi-based superalloy with superior high-temperature microstructural stability, oxidation resistance and mechanical properties, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-024-2843-6

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Xiaorui Zhang, Min Zou, Song Lu, Longfei Li, Xiaoli Zhuang, and Qiang Feng, A novel high-Cr CoNi-based superalloy with superior high-temperature microstructural stability, oxidation resistance and mechanical properties, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-024-2843-6

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研究论文

一种具有优异高温组织稳定性，抗氧化性和力学性能的新型高Cr含量CoNi基高温合金

北京科技大学新金属材料国家重点实验室, 北京材料基因工程高精尖创新中心, 北京 100083, 中国

通讯作者:
李龙飞 E-mail: lilf@skl.ustb.edu.cn

冯强 E-mail: qfeng@skl.ustb.edu.cn

文章亮点

(1) 研发了一种综合性能优异的新型高Cr含量CoNi基高温合金，其目标使用温度为9001000°C。

(2) 该合金在9001000°C长期时效过程中能够保持组织稳定，且γ′相粗化速率低。

(3) 该合金在1000°C高温氧化过程中表面形成连续的Al₂O₃层，抗氧化性能与CMSX-4相当。

(4) 其高温压缩屈服强度和蠕变性能优于部分Ni基和Co–Al–W基高温合金。

中文摘要

γ′相强化Co基高温合金由于具有与Ni基高温合金相当的高温力学性能，更高的合金熔点，更好的可加工性能，使这种新型合金具有成为新一代高温结构材料的潜力。为了平衡合金的综合性能和实现工程化应用，目前该合金体系已经逐步发展为多组元CoNi基高温合金。面向具有更高承温能力(>900°C)的燃机用抗腐蚀高温合金材料，本研究研发了一种具有优异高温组织稳定性，抗氧化性和力学性能的新型高Cr含量CoNi基高温合金。结果表明，该合金在9001000°C的长期时效过程中保持了较高γ′相体积分数、近立方状γ′相形貌和极低的γ′相粗化速率，且未析出TCP相，表现出优异的高温组织稳定性能。合金在1000°C空气环境下氧化100 h后的氧化增重为0.6 mg/cm²，在氧化过程中表面形成连续Al₂O₃层，其抗氧化性能优于镍基铸造高温合金MarM247，与CMSX-4合金相当。此外，该合金具有良好的高温力学性能，其多晶材料的高温压缩屈服强度显著高于MarM247合金，在950°C时的最小压缩蠕变速率与镍基铸造高温合金MarM247，IN100合金相当。在本研究中，高Cr含量CoNi基高温合金中Cr元素是γ′相粗化速率控制性元素。此外，高Cr含量有利于提高合金高温抗氧化和力学性能。本研究为工业燃气轮机用CoNi基铸造高温合金的成分设计提供了参考依据及理论支持。

关键词:

Research Article

A novel high-Cr CoNi-based superalloy with superior high-temperature microstructural stability, oxidation resistance and mechanical properties

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Abstract

Abstract

A novel multicomponent high-Cr CoNi-based superalloy with superior comprehensive performance was prepared, and the evaluation of its high-temperature microstructural stability, oxidation resistance, and mechanical properties was conducted mainly using its cast polycrystalline alloy. The results disclosed that the morphology of the γ′ phase remained stable, and the coarsening rate was slow during the long-term aging at 900–1000°C. The activation energy for γ′ precipitate coarsening of alloy 9CoNi-Cr was (402 ± 51) kJ/mol, which is higher compared with those of CMSX-4 and some other Ni-based and Co-based superalloys. Importantly, there was no indication of the formation of topologically close-packed phases during this process. All these factors demonstrated the superior microstructural stability of the alloy. The mass gain of alloy 9CoNi-Cr was 0.6 mg/cm² after oxidation at 1000°C for 100 h, and the oxidation resistance was comparable to advanced Ni-based superalloys CMSX-4, which can be attributed to the formation of a continuous Al₂O₃ protective layer. Moreover, the compressive yield strength of this cast polycrystalline alloy at high temperatures is clearly higher than that of the conventional Ni-based cast superalloy and the compressive minimum creep rate at 950°C is comparable to that of the conventional Ni-based cast superalloy, demonstrating the alloy’s good mechanical properties at high temperature. This is partially because high Cr is beneficial in improving the γ and γ′ phase strengths of alloy 9CoNi-Cr.
- CoNi-based superalloys;
- microstructure;
- coarsening;
- oxidation;
- mechanical properties

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