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<p>For the next generation of aeroengines, casings may experience fatigue and creep at service temperatures around 800&#xa0;°C, with short exposures up to 850&#xa0;°C. Currently, the main alloys used for casing applications have maximum service temperatures below 800&#xa0;°C, but their mechanical properties start to decrease above 750&#xa0;°C. The objective of this work is to develop an alloy capable of withstanding higher service temperatures compared to Waspaloy. The design approach focused on achieving specific carbide distributions in a <i>γ</i>′-strengthened alloy to control the grain size within an intermediate range (ASTM 2-6/40 to 160&#xa0;<i>µ</i>m), providing an optimal balance between fatigue and creep resistance. These properties strongly depend on the alloy composition, which were assessed using phase diagram modeling. Five experimental alloy compositions were produced alongside two reference alloys, Waspaloy and AD730®. The targeted populations of carbides were observed in all experimental alloys except in the Ta-rich alloy, which exhibited Ta-rich carbides. This alloy demonstrated the best grain size control under supersolvus conditions. Nearly all experimental alloys show improvements in tensile strength, creep resistance, and oxidation behavior compared to Waspaloy. Finally, susceptibility to freckle formation was assessed.</p>

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Development and Characterization of New Ni-Based Superalloys for Turbine Casing Applications

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • Laurane Finet,
  • Antoine Lacour-Gogny-Goubert,
  • Anne-Laure Rouffie,
  • Edern Menou,
  • Coraline Crozet,
  • Jean-Michel Franchet,
  • Julien De Jaeger

摘要

For the next generation of aeroengines, casings may experience fatigue and creep at service temperatures around 800 °C, with short exposures up to 850 °C. Currently, the main alloys used for casing applications have maximum service temperatures below 800 °C, but their mechanical properties start to decrease above 750 °C. The objective of this work is to develop an alloy capable of withstanding higher service temperatures compared to Waspaloy. The design approach focused on achieving specific carbide distributions in a γ′-strengthened alloy to control the grain size within an intermediate range (ASTM 2-6/40 to 160 µm), providing an optimal balance between fatigue and creep resistance. These properties strongly depend on the alloy composition, which were assessed using phase diagram modeling. Five experimental alloy compositions were produced alongside two reference alloys, Waspaloy and AD730®. The targeted populations of carbides were observed in all experimental alloys except in the Ta-rich alloy, which exhibited Ta-rich carbides. This alloy demonstrated the best grain size control under supersolvus conditions. Nearly all experimental alloys show improvements in tensile strength, creep resistance, and oxidation behavior compared to Waspaloy. Finally, susceptibility to freckle formation was assessed.