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Atomistic investigations of kappa-carbide precipitation in austenitic Fe-Mn-Al-C lightweight steels and the effect of Mo addition

Title
Atomistic investigations of kappa-carbide precipitation in austenitic Fe-Mn-Al-C lightweight steels and the effect of Mo addition
Authors
Moon, J[Moon, Joonoh]Park, SJ[Park, Seong-Jun]Jang, JH[Jang, Jae Hoon]Lee, TH[Lee, Tae-Ho]Lee, CH[Lee, Chang-Hoon]Hong, HU[Hong, Hyun-Uk]Suh, DW[Suh, Dong-Woo]Kim, SH[Kim, Seong Hoon]Han, HN[Han, Heung Nam]Lee, BH[Lee, Bong Ho]
DGIST Authors
Lee, BH[Lee, Bong Ho]
Issue Date
2017-01-15
Citation
Scripta Materialia, 127, 97-101
Type
Article
Article Type
Article
Keywords
AluminumAtom-Probe TomographyAtom Probe Tomography (APT)AusteniteCalculationsCarbide PrecipitationCarbidesEnergy ContributionFirst-Principles CalculationFirst-Principles CalculationsFormation EnergiesHigh Resolution Transmission Electron MicroscopyKappa-Carbide PrecipitationLight-Weight SteelLight-Weight SteelsManganeseNanoindentationNanoindentation ExperimentsPrecipitation BehaviorProbesStrain EnergyTransmission Electron Microscopy
ISSN
1359-6462
Abstract
The effect of Mo addition on precipitation behavior of κ-(Fe,Mn)3AlC during aging in austenitic Fe-Mn-Al-C lightweight steels was investigated. First-principles calculations indicate that substitution of Fe or Mn by Mo in κ-carbide is energetically unfavorable in the respect to formation energy, and it, moreover, increases strain energy contribution to interfacial energy between austenite matrix and κ-carbide. Atom probe tomography (APT) and transmission electron microscopy (TEM) analysis showed the results consistent with the calculations, i.e., Mo didn't partition into κ-carbide and delayed κ-carbide precipitation. Finally, nanoindentation experiments presented that Mo addition changed the aging hardening behavior, corresponding to κ-carbide precipitation behavior. © 2016 Acta Materialia Inc.
URI
http://hdl.handle.net/20.500.11750/2048
DOI
10.1016/j.scriptamat.2016.08.036
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Related Researcher
Files:
There are no files associated with this item.
Collection:
Center for Core Research Facilities1. Journal Articles


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