ID | 60106 |
著者 |
Okayasu, Mitsuhiro
Graduate School of Natural Science and Technology, Okayama University
ORCID
Kaken ID
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Sato, Masaya
Graduate School of Natural Science and Technology, Okayama University
ORCID
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Ishida, Daiki
Graduate School of Natural Science and Technology, Okayama University
Senuma, Takehide
Graduate School of Natural Science and Technology, Okayama University
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抄録 | Hydrogen embrittlement (HE) characteristics in Fe–C–Mn-xNb steels were examined via various analyses, including electron backscatter diffraction analysis, scanning transmission electron microscopy and three-dimensional atom-probe tomography. For the investigation, the steel samples were prepared with varying Nb contents and heat treatment processes. The material properties of steel samples that were subjected to: (i) water quenching and (ii) quenching and tempering at 170 °C for 20 min, were determined to be nearly similar, although different degrees of HE were detected. After the tempering process, ε-carbide precipitated clearly in the matrix, which could act as a trapping site for hydrogen atoms and lead to improved HE resistance. Moreover, with addition of Nb, niobium base precipitates (e.g., NbC) with a diameter of a few nanometers were obtained in the martensite matrix, which could also function as hydrogen trapping sites. There was slight improvement in the HE resistance with NbC. Hydrogen-assisted failure mechanisms under both static and cyclic loading were observed with intergranular brittle cracking for the water quenched sample, even though the brittle and ductile mix failure mode was detected for the sample after the quenching and tempering process.
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キーワード | Steel
Hydrogen embrittlement;
Trapping site
Niobium carbide;
ε-carbide
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発行日 | 2020-06-18
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出版物タイトル |
Materials Science and Engineering: A
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巻 | 791巻
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出版者 | Elsevier
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開始ページ | 139598
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ISSN | 0921-5093
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NCID | AA10720420
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資料タイプ |
学術雑誌論文
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言語 |
英語
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OAI-PMH Set |
岡山大学
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著作権者 | © 2020 Elsevier B.V.
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論文のバージョン | author
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DOI | |
関連URL | isVersionOf https://doi.org/10.1016/j.msea.2020.139598
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ライセンス | https://creativecommons.org/licenses/by-nc-nd/4.0/
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