Hydrogen-assisted failure in a twinning-induced plasticity steel studied under in situ hydrogen charging by electron channeling contrast imaging

Motomichi Koyama; Eiji Akiyama; Kaneaki Tsuzaki; Dierk Raabe

doi:10.1016/j.actamat.2013.04.030

Hydrogen-assisted failure in a twinning-induced plasticity steel studied under in situ hydrogen charging by electron channeling contrast imaging

Motomichi Koyama, Eiji Akiyama, Kaneaki Tsuzaki, Dierk Raabe

IMR - Materials Design Division

Research output: Contribution to journal › Article › peer-review

216 Citations (Scopus)

Abstract

We investigated the hydrogen embrittlement of a Fe-18Mn-1.2%C (wt.%) twinning-induced plasticity steel, focusing on the influence of deformation twins on hydrogen-assisted cracking. A tensile test under ongoing hydrogen charging was performed at low strain rate (1.7 × 10^-6 s ^-1) to observe hydrogen-assisted cracking and crack propagation. Hydrogen-stimulated cracks and deformation twins were observed by electron channeling contrast imaging. We made the surprising observation that hydrogen-assisted cracking was initiated both at grain boundaries and also at deformation twins. Also, crack propagation occurred along both types of interfaces. Deformation twins were shown to assist intergranular cracking and crack propagation. The stress concentration at the tip of the deformation twins is suggested to play an important role in the hydrogen embrittlement of the Fe-Mn-C twining-induced plasticity steel.

Original language	English
Pages (from-to)	4607-4618
Number of pages	12
Journal	Acta Materialia
Volume	61
Issue number	12
DOIs	https://doi.org/10.1016/j.actamat.2013.04.030
Publication status	Published - 2013 Jul

Keywords

Crack propagation
Electron channeling contrast imaging
Hydrogen embrittlement
Mechanical properties
Twinning-induced plasticity (TWIP) steel

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10.1016/j.actamat.2013.04.030

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title = "Hydrogen-assisted failure in a twinning-induced plasticity steel studied under in situ hydrogen charging by electron channeling contrast imaging",

abstract = "We investigated the hydrogen embrittlement of a Fe-18Mn-1.2%C (wt.%) twinning-induced plasticity steel, focusing on the influence of deformation twins on hydrogen-assisted cracking. A tensile test under ongoing hydrogen charging was performed at low strain rate (1.7 × 10-6 s -1) to observe hydrogen-assisted cracking and crack propagation. Hydrogen-stimulated cracks and deformation twins were observed by electron channeling contrast imaging. We made the surprising observation that hydrogen-assisted cracking was initiated both at grain boundaries and also at deformation twins. Also, crack propagation occurred along both types of interfaces. Deformation twins were shown to assist intergranular cracking and crack propagation. The stress concentration at the tip of the deformation twins is suggested to play an important role in the hydrogen embrittlement of the Fe-Mn-C twining-induced plasticity steel.",

keywords = "Crack propagation, Electron channeling contrast imaging, Hydrogen embrittlement, Mechanical properties, Twinning-induced plasticity (TWIP) steel",

author = "Motomichi Koyama and Eiji Akiyama and Kaneaki Tsuzaki and Dierk Raabe",

note = "Funding Information: The authors gratefully acknowledge the financial support by the Elements Strategy Initiative for Structural Materials (ESISM) through the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan. M.K. acknowledges the Research Fellowship of the Japan Society for the Promotion of Science for Young Scientists. The Materials Manufacturing and Engineering Station and Materials Analysis Station at the National Institute for Materials Science supported this work through the production of the samples and the analysis of the chemical compositions.",

year = "2013",

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doi = "10.1016/j.actamat.2013.04.030",

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AU - Koyama, Motomichi

AU - Akiyama, Eiji

AU - Tsuzaki, Kaneaki

AU - Raabe, Dierk

N1 - Funding Information: The authors gratefully acknowledge the financial support by the Elements Strategy Initiative for Structural Materials (ESISM) through the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan. M.K. acknowledges the Research Fellowship of the Japan Society for the Promotion of Science for Young Scientists. The Materials Manufacturing and Engineering Station and Materials Analysis Station at the National Institute for Materials Science supported this work through the production of the samples and the analysis of the chemical compositions.

PY - 2013/7

Y1 - 2013/7

N2 - We investigated the hydrogen embrittlement of a Fe-18Mn-1.2%C (wt.%) twinning-induced plasticity steel, focusing on the influence of deformation twins on hydrogen-assisted cracking. A tensile test under ongoing hydrogen charging was performed at low strain rate (1.7 × 10-6 s -1) to observe hydrogen-assisted cracking and crack propagation. Hydrogen-stimulated cracks and deformation twins were observed by electron channeling contrast imaging. We made the surprising observation that hydrogen-assisted cracking was initiated both at grain boundaries and also at deformation twins. Also, crack propagation occurred along both types of interfaces. Deformation twins were shown to assist intergranular cracking and crack propagation. The stress concentration at the tip of the deformation twins is suggested to play an important role in the hydrogen embrittlement of the Fe-Mn-C twining-induced plasticity steel.

AB - We investigated the hydrogen embrittlement of a Fe-18Mn-1.2%C (wt.%) twinning-induced plasticity steel, focusing on the influence of deformation twins on hydrogen-assisted cracking. A tensile test under ongoing hydrogen charging was performed at low strain rate (1.7 × 10-6 s -1) to observe hydrogen-assisted cracking and crack propagation. Hydrogen-stimulated cracks and deformation twins were observed by electron channeling contrast imaging. We made the surprising observation that hydrogen-assisted cracking was initiated both at grain boundaries and also at deformation twins. Also, crack propagation occurred along both types of interfaces. Deformation twins were shown to assist intergranular cracking and crack propagation. The stress concentration at the tip of the deformation twins is suggested to play an important role in the hydrogen embrittlement of the Fe-Mn-C twining-induced plasticity steel.

KW - Crack propagation

KW - Electron channeling contrast imaging

KW - Hydrogen embrittlement

KW - Mechanical properties

KW - Twinning-induced plasticity (TWIP) steel

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Hydrogen-assisted failure in a twinning-induced plasticity steel studied under in situ hydrogen charging by electron channeling contrast imaging

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