Journal
SCRIPTA MATERIALIA
Volume 68, Issue 6, Pages 348-353Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2012.08.013
Keywords
Lightweight steels; Ordered carbide; Decomposition; Atom probe tomography
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Funding
- POSCO
- BK21
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We study the structure and chemical composition of the kappa-carbide formed as a result of isothermal transformation in an Fe-3.0Mn-5.5Al-0.3C alloy using transmission electron microscopy and atom probe tomography. Both methods reveal the evolution of kappa-particle morphology as well as the partitioning of solutes. We propose that the kappa-phase is formed by a eutectoid reaction associated with nucleation growth. The nucleation of kappa-carbide is controlled by both the ordering of Al partitioned to austenite and the carbon diffusion at elevated temperatures. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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