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Atomistic investigations of kappa-carbide precipitation in austenitic Fe-Mn-Al-C lightweight steels and the effect of Mo addition
- Atomistic investigations of kappa-carbide precipitation in austenitic Fe-Mn-Al-C lightweight steels and the effect of Mo addition
- 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
- Scripta Materialia, 127, 97-101
- Article Type
- Aluminum; Atom-Probe Tomography; Atom Probe Tomography (APT); Austenite; Calculations; Carbide Precipitation; Carbides; Energy Contribution; First-Principles Calculation; First-Principles Calculations; Formation Energies; High Resolution Transmission Electron Microscopy; Kappa-Carbide Precipitation; Light-Weight Steel; Light-Weight Steels; Manganese; Nanoindentation; Nanoindentation Experiments; Precipitation Behavior; Probes; Strain Energy; Transmission Electron Microscopy
- 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.
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