| About this Abstract |
| Meeting |
10th International Symposium on Superalloy 718 and Derivatives (2023)
|
| Symposium
|
Superalloy 718 and Derivatives
|
| Presentation Title |
Manufacturing Large Superalloy Pipe Bends |
| Author(s) |
John J. De Barbadillo, Brian Baker |
| On-Site Speaker (Planned) |
John J. De Barbadillo |
| Abstract Scope |
The U.S. Department of Energy, through its’ office of Fossil Energy has funded programs to develop materials technology for advanced energy systems such as Advanced Ultra-supercritical (AUSC) coal-fired steam boilers and turbines. The AUSC plant would operate in the 700-800°C temperature range which requires the use of nickel-base alloys to meet design creep -rupture life requirements for welded structures. Specific components include large-diameter, heavy-wall pipes, induction bends and forged fittings. INCONEL alloy 740H is a γʹ-strengthened nickel-base superalloy that was developed for this application and down-selected for the manufacturing demonstration program. Work was recently completed on the Phase 2 program under DOE contract DE-FE0025064 that had the goal of demonstrating the ability of US industrial supply chain to manufacture full-scale components. Alloy 740H contains 16-20% γʹ and is sensitive to thermal stress cracking and auto-aging which affects each stage of the manufacturing operation. This paper describes the manufacture of these components at Special Metals and various subcontractors, the resulting material properties, and the mitigation of process cracking encountered in this work. The test articles are now stored at Oak Ridge National Laboratory awaiting future programs for more detailed material characterization. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |