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<p>This study investigates the microstructural evolution of a novel low-cost second-generation Ni-based single crystal superalloy during long-term thermal exposure at different temperatures (982&#xa0;°C, 1038&#xa0;°C, 1093&#xa0;°C) and its impact on the stress rupture properties of alloy. The results reveal that the γ′ phase undergoes coarsening and rafting at high temperatures, and its growth behavior follows the Ostwald ripening mechanism. With the increase in aging temperature and extension of aging time, the coarsening rate of the γ′ phase increases significantly. Particularly at 1093&#xa0;°C, the γ′ phase undergoes the most pronounced growth, leading to a remarkable deterioration of its precipitation strengthening effect. Furthermore, under conditions of higher temperature and longer time, minor amounts of topologically close-packed (TCP) phase precipitate. As the aging temperature rises and time elapses, the precipitation tendency of the TCP phase shows a slight increase. The stress rupture testing at 1100&#xa0;°C/120&#xa0;MPa demonstrates that the stress rupture life decreases significantly with the increase in thermal exposure temperature and time. This is mainly attributed to the diminished precipitation strengthening effect of the γ′ phase and the deteriorating effect of the TCP phase. However, under the same conditions, the stress rupture properties of this alloy are comparable to those of the DD5 alloy. This research provides theoretical support for enhancing the service stability and reliability of single crystal turbine blades, and offers a reference for the development of cost-effective and high-performance turbine blade materials.</p>

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Microstructure Evolution and Mechanical Properties of a Novel Low-Cost Second-Generation Ni-Based Single Crystal Superalloy After Long-Term Thermal Exposure

  • 期刊论文

  • 发表日期：

    2025年9月17日

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  • Chongwei Zhu,
  • Zhipeng Zhang,
  • Jide Liu,
  • Jinchao Ma,
  • Jiajian Wang,
  • Wenying Zhang,
  • Xinguang Wang,
  • Yizhou Zhou,
  • Jinguo Li

摘要

This study investigates the microstructural evolution of a novel low-cost second-generation Ni-based single crystal superalloy during long-term thermal exposure at different temperatures (982 °C, 1038 °C, 1093 °C) and its impact on the stress rupture properties of alloy. The results reveal that the γ′ phase undergoes coarsening and rafting at high temperatures, and its growth behavior follows the Ostwald ripening mechanism. With the increase in aging temperature and extension of aging time, the coarsening rate of the γ′ phase increases significantly. Particularly at 1093 °C, the γ′ phase undergoes the most pronounced growth, leading to a remarkable deterioration of its precipitation strengthening effect. Furthermore, under conditions of higher temperature and longer time, minor amounts of topologically close-packed (TCP) phase precipitate. As the aging temperature rises and time elapses, the precipitation tendency of the TCP phase shows a slight increase. The stress rupture testing at 1100 °C/120 MPa demonstrates that the stress rupture life decreases significantly with the increase in thermal exposure temperature and time. This is mainly attributed to the diminished precipitation strengthening effect of the γ′ phase and the deteriorating effect of the TCP phase. However, under the same conditions, the stress rupture properties of this alloy are comparable to those of the DD5 alloy. This research provides theoretical support for enhancing the service stability and reliability of single crystal turbine blades, and offers a reference for the development of cost-effective and high-performance turbine blade materials.