A novel ultrafine-grained Fe−22Mn−0.6C TWIP steel with superior strength and ductility

Journal Article · Sat Apr 15 04:00:00 EDT 2017 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2016.12.026· OSTI ID:22689736

Bai, Y. ^[1]; Zhao, L. J. ^[1]; Gao, S. ^[1]; Yang, H. K. ^[2]; Shibata, A. ^[1]; Zhang, Z. F. ^[2]; Tsuji, N. ^[1]

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1. Department of Materials Science and Engineering, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501 (Japan)
2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016 (China)

A fully recrystallized ultrafine-grained (UFG) Fe−22wt.%Mn−0.6wt.%C twinning-induced plasticity (TWIP) steel with mean grain size of 576 nm was fabricated by cold rolling and annealing process. Tensile test showed that this UFG steel possessed high yield strength of 785 MPa, and unprecedented uniform elongation of 48%. The Hall-Petch relationship was verified from the coarse-grained (CG) regime to the ultrafine-grained (UFG) regime. The microstructures at specified tensile strains were characterized by electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM). The microstructures and strain hardening behavior of the UFG TWIP steel were compared with the CG counterpart. The strong strain hardening capability of the UFG steel is supposed to be responsible for the high strength and good ductility. - Highlights: • A fully recrystallized Fe−22Mn−0.6C TWIP steel with mean grain size of 576 nm was fabricated. • The ultrafine-grained (UFG) steel exhibits strong strain-hardening capability, excellent strength and ductility. • The Hall-Petch relationship is fitted well from the CG regime to the UFG regime.

• OSTI ID: 22689736
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Vol. 126; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
BACKSCATTERING
COMPARATIVE EVALUATIONS
DUCTILITY
ELECTRON DIFFRACTION
ELONGATION
GRAIN SIZE
MECHANICAL TESTS
PLASTICITY
PRESSURE RANGE MEGA PA 100-1000
ROLLING
STEELS
STRAIN HARDENING
STRAINS
TRANSMISSION ELECTRON MICROSCOPY
TWINNING
YIELD STRENGTH