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This research explores the properties of CM247LC alloy produced through additive manufacturing. Specifically it focuses on studying its resistance to stress rupture under conditions. CM247LC alloy has exceptional strength, at high temperatures, which makes it crucial in aerospace, power generation, and industrial applications. By utilizing manufacturing techniques on CM247LC, there is potential for component design and manufacturing. However, it is essential to have an understanding of its properties in stress rupture environments. To achieve this, the Direct Metal Laser Sintering Method was employed to manufacture the nickel-based super alloy CM247LC. Stress rupture testing was carried out following ASTM E139 standard on the as-built specimens under different temperatures and different stress levels to evaluate how well the alloy can endure prolonged exposure to high temperatures while maintaining structural integrity. The as-built CM247LC alloy exhibited fine MC carbides (~40 nm) at cell boundaries, which were attributed to the rapid cooling rate during LPBF (calculated as 106 K/s). The high dislocation density at cell boundaries was correlated to pinning by these carbides. Stress rupture testing revealed reduced life at 982 °C (20 min) compared to 760 °C (25 min). Fractography showed predominantly transgranular brittle failure and grain boundary decohesion, indicating opportunities to improve stress rupture life through heat treatment optimization of grain size and carbide/precipitate evolution.

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Evaluation of Additively Manufactured CM247LC Alloy for Microstructural Characteristics and Stress Rupture Performance

  • 会议论文

  • 发表日期：

    2025年

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  • P. Chandramohan,
  • R. Raghu,
  • D. Pradeesh Kumar

摘要

This research explores the properties of CM247LC alloy produced through additive manufacturing. Specifically it focuses on studying its resistance to stress rupture under conditions. CM247LC alloy has exceptional strength, at high temperatures, which makes it crucial in aerospace, power generation, and industrial applications. By utilizing manufacturing techniques on CM247LC, there is potential for component design and manufacturing. However, it is essential to have an understanding of its properties in stress rupture environments. To achieve this, the Direct Metal Laser Sintering Method was employed to manufacture the nickel-based super alloy CM247LC. Stress rupture testing was carried out following ASTM E139 standard on the as-built specimens under different temperatures and different stress levels to evaluate how well the alloy can endure prolonged exposure to high temperatures while maintaining structural integrity. The as-built CM247LC alloy exhibited fine MC carbides (~40 nm) at cell boundaries, which were attributed to the rapid cooling rate during LPBF (calculated as 106 K/s). The high dislocation density at cell boundaries was correlated to pinning by these carbides. Stress rupture testing revealed reduced life at 982 °C (20 min) compared to 760 °C (25 min). Fractography showed predominantly transgranular brittle failure and grain boundary decohesion, indicating opportunities to improve stress rupture life through heat treatment optimization of grain size and carbide/precipitate evolution.