title: Deformation behavior of duplex austenite andε-martensite high-Mn steel.
abstract: Deformation and work hardening behavior of Fe-17Mn-0.02C steel containingε-martensite within the austenite matrix have been investigated by means ofin situmicrostructural observations and x-ray diffraction analysis. During deformation, the steel shows the deformation-induced transformation of austenite →ε-martensite →α'-martensite as well as the direct transformation of austenite →α'-martensite. Based on the calculation of changes in the fraction of each constituent phase, we found that the phase transformation of austenite →ε-martensite is more effective in work hardening than that ofε-martensite →α'-martensite. Moreover, reverse transformation ofε-martensite → austenite has also been observed during deformation. It originates from the formation of stacking faults within the deformedε-martensite, resulting in the formation of 6H-long periodic ordered structure.
authors.affiliation: Graduate Institute of Ferrous Technology, POSTECH, 790-784 Pohang, Korea.
authors.forename: Ki Hyuk
authors.initials: KH
authors.lastname: Kwon
authors.affiliation: Department of Materials Science and Engineering, POSTECH, 790-784 Pohang, Korea.
authors.forename: Byeong-Chan
authors.initials: BC
authors.lastname: Suh
authors.affiliation: Department of Materials Science and Engineering, Seoul National University, 151-744 Seoul, Korea.
authors.forename: Sung-Il
authors.initials: SI
authors.lastname: Baik
authors.affiliation: Department of Materials Science and Engineering, Seoul National University, 151-744 Seoul, Korea.
authors.forename: Young-Woon
authors.initials: YW
authors.lastname: Kim
authors.affiliation: Plate Research Group, Technical Research Laboratories, POSCO, 790-785 Pohang, Korea.
authors.forename: Jong-Kyo
authors.initials: JK
authors.lastname: Choi
authors.affiliation: Graduate Institute of Ferrous Technology, POSTECH, 790-784 Pohang, Korea; Center for Advanced Aerospace Materials, POSTECH, 790-784 Pohang, Korea.
authors.forename: Nack J
authors.initials: NJ
authors.lastname: Kim
keywords: 10.07; 30.03; 30.04; austenite; deformation-induced martensitic transformation; high-Mn steel; stacking faults