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<p>The effect of rejuvenation time on the possibility of repairing service-fully exposed four-stage blades of a 140&#xa0;MW Mitsubishi (MHI 701D series) gas turbine is investigated using long- and short-term rejuvenation heat treatments. Metallography and creep tests, recommended by original equipment manufacturers (OEMs), are experimented on samples made from the blade. The results showed that an as-received sample cannot satisfy all minimum OEM-recommended requirements. In addition, the short-term rejuvenation (holding two-hour full solution) did not effectively satisfy the requirements. However, the long-term rejuvenation (holding four-hour full solution) significantly recovered microstructure and fully mechanical properties. At the same time, the creep life extension obtained using this rejuvenation heat treatment has been about 240%. Furthermore, grain-interior carbides, grain-boundary carbides, and gamma precipitates recovered completely compared to the virgin microstructure of the blade root. Therefore, the long-term heat treatment rather than short-term heat treatment is more efficiently applicable to extend the lifetime of the blades for at least another lifecycle with a more extensive service interval.</p>

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The Effect of Rejuvenation Time on the Repairability of Inconel X750 Superalloy Blades

  • 期刊论文

  • 发表日期：

    2025年9月4日

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  • Ali Pourfathi,
  • MohammadAmin Amjadi,
  • Mohammad Saeed Shahriari

摘要

The effect of rejuvenation time on the possibility of repairing service-fully exposed four-stage blades of a 140 MW Mitsubishi (MHI 701D series) gas turbine is investigated using long- and short-term rejuvenation heat treatments. Metallography and creep tests, recommended by original equipment manufacturers (OEMs), are experimented on samples made from the blade. The results showed that an as-received sample cannot satisfy all minimum OEM-recommended requirements. In addition, the short-term rejuvenation (holding two-hour full solution) did not effectively satisfy the requirements. However, the long-term rejuvenation (holding four-hour full solution) significantly recovered microstructure and fully mechanical properties. At the same time, the creep life extension obtained using this rejuvenation heat treatment has been about 240%. Furthermore, grain-interior carbides, grain-boundary carbides, and gamma precipitates recovered completely compared to the virgin microstructure of the blade root. Therefore, the long-term heat treatment rather than short-term heat treatment is more efficiently applicable to extend the lifetime of the blades for at least another lifecycle with a more extensive service interval.