Abstract
The microstructural evolution, specifically of grain boundaries, precipitates, and dislocations in thermomechanically processed (TMP) Alloy 800H samples was characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), electron backscattered diffraction (EBSD), transmission electron microscopy (TEM), and atomic force microscopy (AFM). The TMP not only significantly increased the fraction of low-Σ coincidence site lattice boundaries, but also introduced nanoscale precipitates in the matrix and altered the distribution of dislocations. Statistical analysis indicates that the morphology and distribution of grain boundary precipitates were dependent on grain boundary types. The microstructure optimization played a synergistic effect on the significantly increased strength with comparable ductility and enhanced intergranular corrosion resistance and creep-fatigue life compared to the as-received samples.
| Original language | English |
|---|---|
| Pages (from-to) | 2755-2761 |
| Number of pages | 7 |
| Journal | Materials Science and Engineering: A |
| Volume | 528 |
| Issue number | 6 |
| DOIs | |
| State | Published - Mar 15 2011 |
Funding
This work was supported by the Department of Energy Generation IV Initiative program and the Idaho National Laboratory ATR program. CompuTherm LLC is acknowledged for kindly providing the license for using their products Pandat software and PanFe-database. This research utilized NSF-supported shared facilities at the University of Wisconsin.
| Funders | Funder number |
|---|---|
| Idaho National Laboratory |
Keywords
- Carbides
- Dislocations
- Grain boundaries
- Precipitation
- Thermomechanical processing