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Deformation Structure Around a Crack in γ′-Fe4N Layer of Nitrided Extra-Low-Carbon Steel Subjected to Cyclic Tensile Test

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Abstract

Numerous slip bands were detected in the γ′ layer of nitrided steel subjected to cyclic tensile testing, indicating that γ′ can easily deform plastically under a low-applied stress (175 MPa). A crack arrested inside a γ′ grain propagated along the {100} and {111} planes, and planar dislocations were emitted from the crack tip. The stress concentration at the crack tip induced a cleavage fracture and slipping-off in the γ′, leading to a crack propagation.

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The authors are grateful to the ONEX Corporation for conducting the nitriding treatment and thank the Kanagawa Institute of Industrial Science and Technology for FIB and TEM studies. The authors are grateful to the Research Consortium for Fatigue Damage on Surface Hardened Alloy Steels, and the Research Center for Green Material Innovation in Yokohama National University. The authors also thank Dr. Shinichi Takagi of the Kanagawa Institute of Industrial Science and Technology for his valuable comments. This study is financially supported by the Grant-in-Aid for Scientific Research (KAKENHI) Grant No. 20K1460

On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Authors and Affiliations

  1. Faculty of Mechanical Engineering, Institute of Science and Engineering, Kanazawa University, Kakumamachi, Kanazawa, Ishikawa, 920-1192, Japan

    Norimitsu Koga

  2. Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama, 240-8501, Japan

    Kento Tanahara

  3. Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama, 240-8501, Japan

    Osamu Umezawa

  4. Center of Advanced Innovation Technologies, Vysoká Škola Báňská - Technical University of Ostrava, 17. listopadu 15, 708 33, Ostrava-Poruba, Czech Republic

    Osamu Umezawa

Authors
  1. Norimitsu Koga
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  2. Kento Tanahara
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  3. Osamu Umezawa
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Correspondence to Norimitsu Koga.

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Manuscript submitted November 14, 2021; accepted January 14, 2022.

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Koga, N., Tanahara, K. & Umezawa, O. Deformation Structure Around a Crack in γ′-Fe4N Layer of Nitrided Extra-Low-Carbon Steel Subjected to Cyclic Tensile Test. Metall Mater Trans A 53, 1150–1155 (2022). https://doi.org/10.1007/s11661-022-06607-3

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  • DOI: https://doi.org/10.1007/s11661-022-06607-3

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