Simultaneously enhancing the strength and ductility of Fe–Mn–C twinning-induced plasticity steel via Cr/N alloying

Liu shuai; Huang Jiulong; Ge Yinlei; Sun Weijie; Li dongdong; Feng Yunli

Journal of Materials Research and Technology (Sep 2024)

Simultaneously enhancing the strength and ductility of Fe–Mn–C twinning-induced plasticity steel via Cr/N alloying

Liu shuai,
Huang Jiulong,
Ge Yinlei,
Sun Weijie,
Li dongdong,
Feng Yunli

Affiliations

Liu shuai: College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, China; Corresponding author. College of Metallurgy and Energy, North China University of science and technology, Tangshan, 063210, China.
Huang Jiulong: College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, China
Ge Yinlei: College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, China
Sun Weijie: College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, China
Li dongdong: College of Mechanical Engineering, North China University of Science and Technology, Tangshan 063210, China
Feng Yunli: College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, China

Journal volume & issue: Vol. 32
pp. 3310 – 3317

Abstract

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The effect of Cr/N alloying on the tensile deformation behavior of Fe–Mn–C twinning-induced plasticity steel was investigated through monotonic tensile tests, X-ray diffraction, electron back-scattered diffraction, transmission electron microscopy, and digital image correlation technique. The results demonstrate that the addition of Cr/N significantly enhances both the strength and ductility of Fe–18Mn-0.6C steel while dynamic strain aging (DSA) behavior weakens or even disappears. Compared with that in the Fe–18Mn-0.6C steel, more densely-spaced, thinner deformation twins were formed in the Cr/N-alloyed steel. Moreover, the Cr/N additions promote deformation twins to form over a wider strain range. This unique twinning behavior leads to a sustained high strain-hardening rate at higher strains, thereby delaying plastic instability and concurrently enhancing strength and ductility.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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