Abstract
The roles of the alloying elements in three nanostructured ferritic alloys (14YWT, MA957 and Eurofer 97) have been established through the characterisation of the microstructure by atom probe tomography and spectrum imaging in a transmission electron microscope. Cr, W, Mo, Ti and Y were found in the ferrite matrix and contributed to solid solution hardening. Ti, Y, C, O and N were found in high number densities of precipitates and nanoclusters both in the grain interior and on grain boundaries and thereby contributed to precipitation hardening. Cr, W and Mo were enriched at the intraparticle regions of the grain boundaries. The solute segregation and precipitation pinned the grain boundaries and contributed to the excellent creep properties of the alloys.
| Original language | English |
|---|---|
| Pages (from-to) | 729-734 |
| Number of pages | 6 |
| Journal | Energy Materials: Materials Science and Engineering for Energy Systems |
| Volume | 6 |
| Issue number | 1 |
| State | Published - 2012 |
Keywords
- Atom probe tomography
- Grain boundaries
- Nanostructured ferritic alloys
- Oxide dispersion strengthened steels
- Solute segregation
- Spectrum imaging