| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Microstructure, Defects, and Properties
|
| Presentation Title |
Efficient Improvement of High-Temperature Ductility in Selective Laser Melted Ni-Cr-Co Superalloy by Mg Microalloying and Optimized Heat Treatment |
| Author(s) |
Zexin Quan, Qiang Jia, Yishu Wang, Fu Guo, Qiang Hu, Wenqian Guo |
| On-Site Speaker (Planned) |
Zexin Quan |
| Abstract Scope |
This work leverages the rapid solidification characteristics of Selective Laser Melting (SLM) technology to mitigate cracking. By alloying minor amounts of Mg as a grain boundary-strengthening element into Ni-Cr-Co superalloy and employing an improved heat treatment process, mechanisms for improving the high-temperature ductility of the Ni-Cr-Co superalloy were investigated. The results demonstrate that Mg enriches at the interfaces between grain boundary carbides and the matrix, restricting elemental diffusion between carbides and the matrix, and influencing the morphology and distribution of carbides. Moreover, when Mg added Ni-Cr-Co superalloy in combination with the improved heat treatment process proposed in this work, the high-temperature ductility showed a more than threefold increase in comparison to the standard ones (4.3%→13.5%). At this stage, MgO functions as a nucleating site for nanoscale intragranular carbides, leading to a considerable increase in the presence of Σ3 annealing twins while effectively improving ductility at high temperatures. |