Characterization of Precipitation-Strengthening Heat-Resistant Austenitic Stainless Steels for Life-Prediction Modeling
- Oak Ridge National Laboratory (ORNL)
- Los Alamos National Laboratory (LANL)
- Idaho National Laboratory (INL)
- NETL
In this study, the role of minor alloying additions in 347H stainless steels (UNS34709, ASTM A240/240M) on creep-rupture properties at 650-750°C and microstructure evolution during isothermal exposure at 750°C has been investigated, aiming to provide the experimental dataset as boundary conditions of physics-based modeling for material/component life prediction. Four different 347H heats containing various amounts of boron and nitrogen additions were prepared and evaluated. The combined additions of B and N are found to stabilize the strengthening secondary M23C6 carbides and retarding the transition from M23C6 to sigma phase precipitates during thermal exposure. The observed kinetics of microstructure evolution reasonably explains the improvement of creep-rupture properties of 347H stainless steels with the B and N additions.
- Research Organization:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
- Sponsoring Organization:
- USDOE Office of Fossil Energy and Carbon Management (FECM); USDOE Office of Fossil Energy and Carbon Management (FECM), Office of Carbon Management (FE-20)
- OSTI ID:
- 2477350
- Resource Relation:
- Conference: Conference Name: 10th International Conference on Advances in Materials, Manufacturing & Repair for Power Plants Location: Bonita Springs, FL, United States Start Date: 10/15/2024 12:00:00 AM End Date: 10/18/2024 12:00:00 AM
- Country of Publication:
- United States
- Language:
- English
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