The approach to equilibrium during tempering of a bulk nanocrystalline steel: an atom probe investigation |
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Authors: | F G Caballero M K Miller C Garcia-Mateo |
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Affiliation: | (1) Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Avda Gregorio del Amo, 8, Madrid, 28040, Spain;(2) Materials Science and Technology Division, Oak Ridge National Laboratory (ORNL), P.O. Box 2008, Oak Ridge, TN 37831-6136, USA |
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Abstract: | A local electrode atom probe has been used to analyze the solute partitioning during bainite transformation in a novel, nanocrystalline
bainitic steel. Atom probe results show the absence of any partitioning of substitutional elements between the phases involved.
The results are fully consistent with the diffusionless transformation of austenite to bainite. However, substitutional elements
are expected to redistribute approaching an equilibrium phase boundary as the mixture of bainitic ferrite and retained austenite
is tempered. The compositional analysis of the austenite/ferrite interface by atom probe tomography indicates that retained
austenite decomposes during tempering before equilibrium is reached at the interface. |
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