Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1581362 | Materials Science and Engineering: A | 2008 | 12 Pages |
Abstract
The coarsening of the three-dimensional microstructure resulting from phase separation during ageing at 748 K of a Fe-based PM 2000⢠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 αⲠphase. The aluminum and titanium were found to preferential partition to the iron-rich α phase. The partitioning of aluminum is consistent with theoretical calculations. The change in the scale of the chromium-enriched αⲠphase 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 α and αⲠphases 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 αⲠphase.
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
C. Capdevila, M.K. Miller, K.F. Russell, J. Chao, J.L. González-Carrasco,