| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Solid-State Phase Transformations and Microstructural Evolution
|
| Presentation Title |
The Effects of Scanning Strategy on Cracking and Grain Structure of the IN738LC Superalloy Produced by Selective Laser Melting |
| Author(s) |
Marcus Chunwai Lam |
| On-Site Speaker (Planned) |
Marcus Chunwai Lam |
| Abstract Scope |
Selective laser melting (SLM) of high-strength nickel-base superalloys such as IN738LC can significantly shorten the development cycle and simplify the production process of gas turbine components. The high crack susceptibility of these alloys can however be challenging, especially on the surfaces of complex geometries where the cracks cannot be effectively closed or removed. In this work, the study of various scanning strategies revealed significant differences in their crack susceptibilities. More importantly, the cracking was found to be related to the grain structures produced during the solidification process. The result indicates a general trend in crack minimization by producing certain grain textures through better controlling the laser scanning paths. The practical limits in exploiting this microstructural trend was also demonstrated in terms of buildability. The findings from this research can lead to better scanning strategy design to mitigate the surface cracks and optimizing the grain structure. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Solidification |