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<p>The Directionally Solidified (DS)-CM247LC superalloy is used in gas turbine applications because of its excellent mechanical properties under extreme temperatures, where these properties are closely linked to its microstructure and <i>γ</i>′ precipitate distribution. This study investigates the effects of solution annealing and subsequent aging treatments on the alloy’s microstructure and performance. A higher solution-annealing (SA) temperature of 1280&#xa0;°C was chosen to intentionally induce incipient melting, replicating localized overheating scenarios that may arise at the component level. Studying this microstructure and mechanical behavior is important as it can occur in industrial applications. This study aims to analyze its impact on <i>γ</i>′ evolution after SA and compare its influence during high-temperature aging (HTA) at 1060&#xa0;°C for 20&#xa0;h and low-temperature aging (LTA) at 650&#xa0;°C for 20&#xa0;h. The development of coarse and globular shaped <i>γ</i>′ precipitates is a result of the solution annealing process, while aging treatments refined the <i>γ</i>′ structure, with HTA producing coarser and elongated <i>γ</i>′ structure and in LTA shows refinement of <i>γ</i>′ precipitates developed in SA stage. Mechanical testing revealed that the coarser and elongated precipitates in HTA led to, degradation in mechanical properties, while LTA had a beneficial effect. Micro hardness of 385 ± 15 HV in LTA proves more effective in stabilizing and strengthening DS-CM247LC than HTA, which has a hardness of 325 ± 6 HV.</p> Graphical Abstract <p></p>

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The Structural Stability of Directionally Solidified CM247LC Superalloy Exposed to High and Low Temperature Aging

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Praveen Gagrai,
  • Jyoti Shankar Jha,
  • Alok Singh Chauhan,
  • Dibyendu Chatterjee,
  • Shanta Chakrabarty

摘要

The Directionally Solidified (DS)-CM247LC superalloy is used in gas turbine applications because of its excellent mechanical properties under extreme temperatures, where these properties are closely linked to its microstructure and γ′ precipitate distribution. This study investigates the effects of solution annealing and subsequent aging treatments on the alloy’s microstructure and performance. A higher solution-annealing (SA) temperature of 1280 °C was chosen to intentionally induce incipient melting, replicating localized overheating scenarios that may arise at the component level. Studying this microstructure and mechanical behavior is important as it can occur in industrial applications. This study aims to analyze its impact on γ′ evolution after SA and compare its influence during high-temperature aging (HTA) at 1060 °C for 20 h and low-temperature aging (LTA) at 650 °C for 20 h. The development of coarse and globular shaped γ′ precipitates is a result of the solution annealing process, while aging treatments refined the γ′ structure, with HTA producing coarser and elongated γ′ structure and in LTA shows refinement of γ′ precipitates developed in SA stage. Mechanical testing revealed that the coarser and elongated precipitates in HTA led to, degradation in mechanical properties, while LTA had a beneficial effect. Micro hardness of 385 ± 15 HV in LTA proves more effective in stabilizing and strengthening DS-CM247LC than HTA, which has a hardness of 325 ± 6 HV.

Graphical Abstract