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<p>Superalloys have been extensively utilized in aeroengine turbine blades due to their exceptional high-temperature mechanical properties. Critical regions within turbine blades, such as the blade roots and internal cooling passage connections, operate under relatively low to intermediate temperatures (650–950&#xa0;°C) while experiencing high stress levels (500–800&#xa0;MPa). The creep deformation and fracture behavior of superalloys under these conditions fundamentally determine the mechanical reliability of such components. At the same time, the increasing demand for higher turbine inlet temperatures necessitates the development of next-generation, high-performance superalloys. Recently developed Co-based superalloys have attracted significant attention due to their superior hot corrosion resistance and higher melting points compared to traditional Ni-based counterparts. This review summarizes two decades of research progress on the creep behavior of superalloys under low to intermediate temperature conditions. It systematically compares the creep performance and deformation mechanisms of Ni-based and Co-based superalloys. Furthermore, it explores the role of critical alloying elements in influencing creep properties and microstructural evolution in these temperature regimes. The review aims to provide strategic insights for the design and optimization of next-generation superalloys for advanced turbine applications.</p>

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Review:Creep behavior and deformation mechanisms of superalloys at low and intermediate temperatures

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • Zhujun Sun,
  • Wenqi Guo,
  • Ronghai Wu,
  • Muzi Chen,
  • Xiaoxiang Wu

摘要

Superalloys have been extensively utilized in aeroengine turbine blades due to their exceptional high-temperature mechanical properties. Critical regions within turbine blades, such as the blade roots and internal cooling passage connections, operate under relatively low to intermediate temperatures (650–950 °C) while experiencing high stress levels (500–800 MPa). The creep deformation and fracture behavior of superalloys under these conditions fundamentally determine the mechanical reliability of such components. At the same time, the increasing demand for higher turbine inlet temperatures necessitates the development of next-generation, high-performance superalloys. Recently developed Co-based superalloys have attracted significant attention due to their superior hot corrosion resistance and higher melting points compared to traditional Ni-based counterparts. This review summarizes two decades of research progress on the creep behavior of superalloys under low to intermediate temperature conditions. It systematically compares the creep performance and deformation mechanisms of Ni-based and Co-based superalloys. Furthermore, it explores the role of critical alloying elements in influencing creep properties and microstructural evolution in these temperature regimes. The review aims to provide strategic insights for the design and optimization of next-generation superalloys for advanced turbine applications.