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Sci Technol Adv Mater. 2013 Mar 12;14(1):014204. eCollection 2013 Feb.

Deformation behavior of duplex austenite and ε-martensite high-Mn steel.

Author information

1
Graduate Institute of Ferrous Technology, POSTECH, 790-784 Pohang, Korea.
2
Department of Materials Science and Engineering, POSTECH, 790-784 Pohang, Korea.
3
Department of Materials Science and Engineering, Seoul National University, 151-744 Seoul, Korea.
4
Plate Research Group, Technical Research Laboratories, POSCO, 790-785 Pohang, Korea.
5
Graduate Institute of Ferrous Technology, POSTECH, 790-784 Pohang, Korea; Center for Advanced Aerospace Materials, POSTECH, 790-784 Pohang, Korea.

Abstract

Deformation and work hardening behavior of Fe-17Mn-0.02C steel containing ε-martensite within the austenite matrix have been investigated by means of in situ microstructural 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 of ε-martensite → α'-martensite. Moreover, reverse transformation of ε-martensite → austenite has also been observed during deformation. It originates from the formation of stacking faults within the deformed ε-martensite, resulting in the formation of 6H-long periodic ordered structure.

KEYWORDS:

10.07; 30.03; 30.04; austenite; deformation-induced martensitic transformation; high-Mn steel; stacking faults

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