About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing for Energy Industry
|
| Presentation Title |
Crack inhibition and ductility improvement in IN738LC laser powder bed fusion product |
| Author(s) |
Kosuke Kuwabara, Masahiro Kusano, Ayako Ikeda, Toshio Osada, Makoto Watanabe |
| On-Site Speaker (Planned) |
Kosuke Kuwabara |
| Abstract Scope |
Improving the manufacturability and mechanical reliability of additively manufactured high-temperature nickel-based superalloys is critical for advancing turbine efficiency and enabling next-generation energy systems. However, alloys designed for extreme environments, such as IN738LC, exhibit severe crack susceptibility and limited high-temperature ductility, constraining their use in laser powder bed fusion (LPBF). This study systematically evaluates how LPBF processing parameters and post-build heat treatments influence cracking behavior and ductility loss in IN738LC, and demonstrates practical strategies to mitigate these limitations. By coupling scan-strategy optimization with microstructure-tailored heat treatments, we achieve substantial reductions in cracking and measurable improvements in high-temperature tensile ductility. Microstructural characterization and in-situ high-temperature tensile testing reveal how grain morphology and grain-boundary character govern the observed property enhancements. These findings provide a mechanistic and process-focused framework for enabling the additive manufacturing of conventionally “non-weldable” superalloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Copper / Nickel / Cobalt, High-Temperature Materials |