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<p>Nickel-based superalloy segmented rings, serving as crucial components in gas turbines rather than merely fasteners, are highly demanded due to their significance in ensuring the reliable operation of gas turbines. Nevertheless, when these rings are manufactured via the investment casting process, defects like shrinkage cavities and porosity often exist. Combined with numerical simulation techniques, the impacts of pouring temperatures and shell preheating temperatures on the temperature field and fluid field during the casting process and the formation mechanisms of such defects were separately explored. The results demonstrated that as the pouring temperature mounts, the volume of shrinkage cavities tends to increase first and then decrease. When the pouring temperature was set at 1420&#xa0;°C, the volume of shrinkage cavities decreased at first and then increased with the increase in shell preheating temperature. However, when the temperature at the moment of pouring was 1410&#xa0;°C, the volume of shrinkage cavities grew as the shell preheating temperature increased. When the pouring temperature is 1410&#xa0;°C and the shell preheating temperature is 950&#xa0;°C, there are almost no defects in the castings. Once the shell preheating temperature is decreased, the hot spot’s solidification mode transforms from mushy solidification to sequential solidification, so that the volume of the shrinkage cavity gets reduced. Moreover, the grains obtained through CAFÉ simulation are all equiaxed. Their sizes and shapes are relatively uniform in all directions, consistent with the experiment.</p>

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The Influence and Optimization of Investment Casting Parameters on Shrinkage Cavity Formation in Segmented Turbine Ring Castings

  • 期刊论文

  • 发表日期：

    2025年6月19日

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  • Shi Cheng,
  • Shu Wang,
  • Ruirun Chen,
  • Zhaohui Hu,
  • Peng Zhang,
  • Hongze Fang,
  • Qiuju Zhu,
  • Haitao Liu,
  • Xiaoming Wang,
  • Yalong Gao,
  • Jingjie Guo

摘要

Nickel-based superalloy segmented rings, serving as crucial components in gas turbines rather than merely fasteners, are highly demanded due to their significance in ensuring the reliable operation of gas turbines. Nevertheless, when these rings are manufactured via the investment casting process, defects like shrinkage cavities and porosity often exist. Combined with numerical simulation techniques, the impacts of pouring temperatures and shell preheating temperatures on the temperature field and fluid field during the casting process and the formation mechanisms of such defects were separately explored. The results demonstrated that as the pouring temperature mounts, the volume of shrinkage cavities tends to increase first and then decrease. When the pouring temperature was set at 1420 °C, the volume of shrinkage cavities decreased at first and then increased with the increase in shell preheating temperature. However, when the temperature at the moment of pouring was 1410 °C, the volume of shrinkage cavities grew as the shell preheating temperature increased. When the pouring temperature is 1410 °C and the shell preheating temperature is 950 °C, there are almost no defects in the castings. Once the shell preheating temperature is decreased, the hot spot’s solidification mode transforms from mushy solidification to sequential solidification, so that the volume of the shrinkage cavity gets reduced. Moreover, the grains obtained through CAFÉ simulation are all equiaxed. Their sizes and shapes are relatively uniform in all directions, consistent with the experiment.