PHASE SEPARATION IN PM 2000 FE-BASE ODS ALLOY: EXPERIMENTAL STUDY AT THE ATOMIC LEVEL
- CENIM-CSIC, Madrid, Spain
- ORNL
The coarsening of the three-dimensional microstructure resulting from phase separation during ageing at 748 K of a Fe-based PM 2000{trademark} oxide dispersion strengthened (ODS) steel has been investigated by atom probe tomography and hardness measurements. Phase separation resulted in the formation of isolated particles of the chromium-enriched {alpha}{prime} phase. The aluminum and titanium were found to preferential partition to the iron-rich {alpha} phase. The partitioning of aluminum is consistent with theoretical calculations. The change in the scale of the chromium-enriched {alpha}{prime} phase was found to fit a power law with a time exponent of 0.32 in accordance with that predicted by the classical Lifshitz, Slyozov and Wagner (LSW) theory. The solute concentrations of the coexisting {alpha} and {alpha}{prime} phases were estimated from concentration frequency distributions with the Langer-Bar-on-Miller (LBM) method and proximity histograms. The hardness was linearly related to the chromium content of the {alpha}{prime} phase.
- Research Organization:
- Oak Ridge National Laboratory (ORNL); Shared Research Equipment Collaborative Research Center
- Sponsoring Organization:
- SC USDOE - Office of Science (SC)
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 936036
- Journal Information:
- Materials Science and Engineering A, Journal Name: Materials Science and Engineering A Journal Issue: 1-2 Vol. 490
- Country of Publication:
- United States
- Language:
- English
Similar Records
Influence of the - phase separation on the tensile properties of Fe-base ODS PM 2000 alloy
In-situ X-ray diffraction study of diffusion-controlled coarsening kinetics in an Ni-Si alloy. [Ni-12. 5 at% Si]