| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Solid-State Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Improving the Creep Properties on gamma prime-strengthened Nickel-based Superalloy by Selective Laser Melting |
| Author(s) |
Marcus Chunwai Lam |
| On-Site Speaker (Planned) |
Marcus Chunwai Lam |
| Abstract Scope |
Selective laser melting (SLM) of γ'-strengthened nickel-based superalloy can simplify the production process of gas turbine components and enable more efficient designs. These advantages however are offset by the reported inferior high temperature creep properties. The as-SLM microstructure is vastly different than the conventionally casted in terms of γ' volume fraction and grain size, and not surprisingly subsequent heat treatment using the conventional scheme produced a different, and very often, inferior microstructure for creep resistance. In this research, we are reporting a study of post heat treatment schemes that produced several microstructural features favorable to creep resistance, such as large grains, torturous grain boundaries and micro-pores minimization. The improvements result in creep property exceeding the requirements of the conventionally casted superalloys in terms of stress rupture time, proving that the creep properties of SLM-produced superalloys can be comparable to the conventional with better post heat treatment design. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Mechanical Properties |