| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Friction Stir Welding and Processing XII
|
| Presentation Title |
Friction Stir Welding of Nickel-based Superalloys |
| Author(s) |
Mageshwari Komarasamy, Christopher B Smith, Woongjo Choi, Jens T Darsell, Glenn Grant |
| On-Site Speaker (Planned) |
Mageshwari Komarasamy |
| Abstract Scope |
Advanced ultra-supercritical (A-USC) steam plants are designed to operate at high temperatures and pressures due to the necessity for higher operational efficiency. The extreme operating conditions of A-USC requires the deployment of precipitation strengthened Ni-base alloys that exhibit elevated temperature strength and good fabricability. In the current study, friction stir welding, a solid-state joining technique was implemented on Haynes 282 (a precipitation strengthened nickel-based superalloy). Cross-weld tensile and creep tests, and electron microscopy characterization have led to the following observations. In post-weld heat treated condition, 100% joint efficiency was obtained. Under 760°C and 871°C thermal exposure, the welded region exhibited excellent thermal stability and higher strength as compared to the base material. Creep properties of the weld was similar to the base material under tested stress values. The microstructure of the creep failed sample and the creep failure mechanisms were investigated in detail. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Joining, Mechanical Properties, High-Temperature Materials |