Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 1240-1248 |
| Number of pages | 9 |
| Journal | Advances in Materials Technology for Fossil Power Plants |
| Volume | 2024-October |
| Issue number | 2025 |
| DOIs | |
| State | Published - 2024 |
| Event | 10th International Conference on Advances in Materials, Manufacturing, and Repair for Power Plants, EPRI 2024 - Bonita Springs, United States Duration: Oct 15 2024 → Oct 18 2024 |
Funding
This work was performed in support of the US DOE Office of Fossil Energy and Carbon Management through the eXtremeMAT (XMAT) program under Crosscutting Technology High Performance Materials Research Program. SEM characterization was supported by the Center for Nanophase Materials Sciences (CNMS), which is a US Department of Energy, Office of Science User Facility at Oak Ridge National Laboratory.
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