| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advancing Current and State-of-the-Art Application of Ni- and Co-based Superalloys
|
| Presentation Title |
Heat Treatment Behavior and Microstructure Evolution of Ni-Cr-Mo-W (Haynes 244) Alloy after Surface Treatment by Ultrasonic Nanocrystalline Surface Modification (UNSM) and Laser Shock Peening (LSP) |
| Author(s) |
Jie Song, Anurag Sharma, Boateng Twum Donkor, Vijay Vasudevan |
| On-Site Speaker (Planned) |
Jie Song |
| Abstract Scope |
Ni base superalloys are widely used in high temperature environments because of their excellent mechanical properties at elevated temperature, resistance to creep deformation and corrosion. The surface treatments by Ultrasonic Nanocrystalline Surface Modification (UNSM) and Laser Shock Peening (LSP) can play an important role in promoting Ni2(Cr,Mo) precipitation and improving the high temperature behaviors of the Haynes 244 alloy. In this study, Haynes 244 alloy surface treatment were introduced using both UNSM and LSP methods by controlled process parameters, and the microstructure (precipitation identification, gran size, texture, etc.) characterized using electron microscopes. The residual stress, hardness, and mechanical properties distributions from surface to center were also characterized. The results show that UNSM and LSP leads to hierarchically precipitation behavior and exceptional mechanical properties, which will be presented and discussed. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |