About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
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| Symposium
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Additive Manufacturing, Directed Energy Deposition of Metals: Processing – Microstructure – Mechanical Property Relationships
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| Presentation Title |
A-7: Compositionally Optimized Superalloys for Additive Manufacturing: Understanding the Microstructure-Crack Resistance-Property Relationship |
| Author(s) |
Tae-Gyeong Kim, A-Reum Lee, Hyun-Uk Hong, Chan-Hee Lee, Won-Suk Ko, Byung-Soo Lee, Hae-Jin Lee |
| On-Site Speaker (Planned) |
Tae-Gyeong Kim |
| Abstract Scope |
Additive manufacturing of high γ ′ Ni-based superalloys is challenging due to inherent susceptibility to cracking. This study introduces CW247, a novel cost-reduced, weldable superalloy derived from CM247LC, specifically tailored for additive manufacturing. Leveraging thermodynamic and DFT calculations, the alloy composition was tailored (e.g., reduced Al, controlled B/Zr, optimized Cr/Nb/Ti) to simultaneously improve AM processability and high-temperature property. EBM-processed CW247 demonstrated near crack-free samples (99.8% density). The heat-treated microstructure exhibited a desirable bimodal γ ′ distribution (60.8% volume fraction of primary γ´) and excellent microstructural stability after 1000h thermal exposure at 982 ℃. This study demonstrates the newly-developed alloy’s superior AM processability and promising high-temperature mechanical properties, highlighting the successful synergy between alloy design, AM processing, and properties. |