| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Materials Design and Alloy Development III -- Super Materials and Extreme Environments
|
| Presentation Title |
A Novel Heat Treatment Design to Overcome Inferior Creep Behaviour of SLM Processed IN738LC Alloy |
| Author(s) |
Haoyu Song |
| On-Site Speaker (Planned) |
Haoyu Song |
| Abstract Scope |
Additive manufacturing (AM) has received increasing attention in gas turbine applications due to its advantages in overcoming geometrical limitation and simplifying the manufacturing process. This presentation reports on the selective laser melting (SLM) of the high-strength, Ni-based superalloy IN738LC widely used in gas turbines. SLM-produced IN738LC is known for its problematic inferior creep properties compared with the cast counterpart. In this work, the inferior creep properties were firstly investigated based on the detailed as-SLM microstructural study. A systematic research on several heat treatment schemes was then conducted, revealing the relationships between grain growth, precipitation kinetics and boundary phase pinning. A novel heat treatment scheme is eventually proposed based on the above findings, which enhances the grain structure and ultimately improves the creep resistance. The new heating scheme provides SLM-produced IN738LC alloy with creep performance comparable to that from conventional process, enabling further adaption of SLM on gas turbine components. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Phase Transformations, |