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In this work, the microstructure and cyclic oxidation resistance behavior of GH4080A superalloy by different heat treatments were investigated. The results showed that when the solution temperature increased from 1010 ℃ to 1070 ℃, the grain size grew rapidly. The average grain size at 1070 ℃ was 55 μm, which was twice more than that at 1010 ℃. The cyclic oxidation experiment showed that the alloy had good oxidation resistance and anti stripping performance at 800 ℃. But the sample of 80A-1070 exhibited lower oxidation rates compared to the sample of 80A-1010. This is mainly because sample 80A-1010 has fine grains and an increased number of grain boundaries, which makes it easier to precipitate η-Ni3Ti phases, thus leading to the formation of more TiO2 and accelerating the formation of the scales. In contrast, a protective Cr2O3 outer layer and an Al2O3 oxide inner layer were formed on the surface of sample 80A-1070.

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Cyclic Oxidation Behavior of High Ti/Al Ratio Ni-Based Superalloy at 800 ℃

  • 会议论文

  • 发表日期：

    2025年

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  • Mengxian Li,
  • Zefeng Zhang,
  • Leipeng Xie,
  • Yunfei Zhang,
  • Yingli Zhao,
  • Wen Chen,
  • Dawei Zhang,
  • Yi Cui,
  • Fuzai Guo,
  • Zhen Zhang,
  • Shuang Ji

摘要

In this work, the microstructure and cyclic oxidation resistance behavior of GH4080A superalloy by different heat treatments were investigated. The results showed that when the solution temperature increased from 1010 ℃ to 1070 ℃, the grain size grew rapidly. The average grain size at 1070 ℃ was 55 μm, which was twice more than that at 1010 ℃. The cyclic oxidation experiment showed that the alloy had good oxidation resistance and anti stripping performance at 800 ℃. But the sample of 80A-1070 exhibited lower oxidation rates compared to the sample of 80A-1010. This is mainly because sample 80A-1010 has fine grains and an increased number of grain boundaries, which makes it easier to precipitate η-Ni3Ti phases, thus leading to the formation of more TiO2 and accelerating the formation of the scales. In contrast, a protective Cr2O3 outer layer and an Al2O3 oxide inner layer were formed on the surface of sample 80A-1070.