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Effect of Hydrogen on Evolution of Deformation Microstructure in Low-Carbon Steel with Ferrite Microstructure

35 Pages Posted: 12 May 2021 Publication Status: Under Review

See all articles by Kazuho Okada

Kazuho Okada

Kyoto University - Department of Materials Science and Engineering

Akinobu Shibata

Kyoto University - Department of Materials Science and Engineering; National Institute for Materials Science - Elements Strategy Initiative for Structural Materials (ESISM)

Wu Gong

Kyoto University - Center for Elements Strategy Initiative for Structural Materials (ESISM)

Nobuhiro Tsuji

Kyoto University - Department of Materials Science and Engineering; Elements Strategy Initiative for Structural Materials (ESISM)

Abstract

In this study, the deformation microstructure of hydrogen-charged ferritic-pearlitic 2Mn-0.1C steel was characterized using SEM-BSE, SEM-EBSD, TEM, and neutron diffraction. The microscopic mechanism of hydrogen-related quasi-cleavage fracture along the {011} planes was also discussed.  It was found that hydrogen increased the velocity of screw dislocations, leading to a tangled dislocation morphology, even at the initial stage of deformation (e = 3%). In addition, the density of screw dislocations at the later stage of deformation (e = 20%) increased in the presence of hydrogen. Based on the experimental results, it is proposed that a high density of vacancies accumulated along {011} slip planes by jog-dragging of screw dislocations, and coalescence of the accumulated vacancies led to the hydrogen-related quasi-cleavage fracture along the {011} slip planes.

Suggested Citation

Okada, Kazuho and Shibata, Akinobu and Gong, Wu and Tsuji, Nobuhiro, Effect of Hydrogen on Evolution of Deformation Microstructure in Low-Carbon Steel with Ferrite Microstructure. Available at SSRN: https://ssrn.com/abstract=3844707 or http://dx.doi.org/10.2139/ssrn.3844707

Kazuho Okada (Contact Author)

Kyoto University - Department of Materials Science and Engineering ( email )

Japan

Akinobu Shibata

Kyoto University - Department of Materials Science and Engineering ( email )

Yoshida-Honmachi
Sakyo-ku
Kyoto, 606-8501
Japan

National Institute for Materials Science - Elements Strategy Initiative for Structural Materials (ESISM)

Japan

Wu Gong

Kyoto University - Center for Elements Strategy Initiative for Structural Materials (ESISM) ( email )

Kyoto
Japan

Nobuhiro Tsuji

Kyoto University - Department of Materials Science and Engineering ( email )

Yoshida-Honmachi
Sakyo-ku
Kyoto, Kyoto 606-8501
Japan

HOME PAGE: http://www.tsujilab.mtl.kyoto-u.ac.jp

Elements Strategy Initiative for Structural Materials (ESISM)

Kyoto University
Japan

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