About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing Modeling, Simulation, and Machine Learning: Microstructure, Mechanics, and Process
|
| Presentation Title |
Robust Additive Manufacturable Ni Superalloys Designed by the Integrated Optimization of Local Elemental Segregation and Cracking Susceptibility Criteria |
| Author(s) |
Hao Yu |
| On-Site Speaker (Planned) |
Hao Yu |
| Abstract Scope |
To achieve an effective design of additively manufacturable Ni superalloys with high performance, a hybrid computational design model has been developed, where the strategy to tailor local elemental segregations was integrated within a scheme of minimizing the cracking susceptibility. The carbide phase boundary was introduced into the design routine to tune the spatial distribution of critical solutes at an atomic scale, thereby inhibiting the formation of borides and segregation-induced cracking. New grades of Ni superalloy have been developed with excellent additive manufacturability, as confirmed by the robustness of printing parameters in fabricating crack-free samples. The capability of the phase boundaries to evenly distribute boron atoms was validated experimentally, and the cracking induced by uncontrolled boron segregation at grain boundaries was effectively prevented. The newly designed alloys showed good tensile properties and decent oxidation resistance at different service temperatures, comparable to those of conventionally produced superalloys. |