Atomistic investigations of κ-carbide precipitation in austenitic Fe-Mn-Al-C lightweight steels and the effect of Mo addition. (15th January 2017)

• Record Type: Journal Article
• Authors: Moon, Joonoh; Park, Seong-Jun; Jang, Jae Hoon; Lee, Tae-Ho; Lee, Chang-Hoon; Hong, Hyun-Uk; Suh, Dong-Woo; Kim, Seong Hoon; Han, Heung Nam; Lee, Bong Ho
• Is Part Of: Scripta materialia. Volume 127(2017)
• Page Start: 97
• Page End: 101
• Publication Date: 2017-01-15
• Subjects: Lightweight steel -- κ-Carbide precipitation -- Atom probe tomography (APT) -- First-principles calculations -- Nanoindentation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.08.036
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The effect of Mo addition on precipitation behavior of κ-(Fe, Mn)3 AlC 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. Graphical abstract: