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Reduction of Cracks During Punching Process by Cementite in High Tensile Strength Steel Sheets

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Abstract

An experimental study on high tensile strength steel sheets with ferritic and ferrite–cementite microstructures was performed with the objective of determining the crack formation and propagation mechanism in the punching process. In addition, the effect of dispersed cementites was also investigated. SEM, EPMA, and EBSD analyses confirmed that voids initiate at the ferrite-inclusion/precipitate (TiN, TiS, and cementite) interface, and the voids then propagate into the ferrite matrix by cleavage. EPMA, EBSD, and TEM/EDS demonstrated that cracks which formed within and near a center segregation area propagate along the Mn center segregation by intergranular fracture due to Mn segregation at the grain boundary. In addition to TiN and TiS, observation of the number of cracks, the length of cracks in the punched surface, and the number density of voids in tensile fracture parts indicated that dispersed cementites are also void formation factors, and cementites decrease the number of cracks and average crack length in the punched surface of ferrite–cementite steel sheets by reducing the stress applied to the voids.

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Acknowledgments

The authors are deeply grateful to Mr. S. Takagi, Mr. T. Mino, and Mr. S. Enomoto (Kagami Memorial Research Institute for Materials Science and Technology, Waseda Univ.) for technical support of the EPMA, EBSD, and TEM/EDS analyses.

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Authors and Affiliations

  1. Graduate School of Fundamental Science and Engineering, Waseda University, 59-305, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan

    Takehiro Okano & Chikara Inoue

  2. Faculty of Fundamental Science and Engineering, Kagami Memorial Research Institute of Materials Science and Technology, Waseda University, 59-305, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan

    Shinsuke Suzuki

  3. JFE Steel Corporation, 1-1 Minamiwataridacho, Kawasaki, Kanagawa, 210-0855, Japan

    Kazuhiko Yamazaki & Shunsuke Toyoda

Authors
  1. Takehiro Okano
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  2. Chikara Inoue
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  3. Shinsuke Suzuki
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  4. Kazuhiko Yamazaki
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  5. Shunsuke Toyoda
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Corresponding author

Correspondence to Chikara Inoue.

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Manuscript submitted August 7, 2018.

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Okano, T., Inoue, C., Suzuki, S. et al. Reduction of Cracks During Punching Process by Cementite in High Tensile Strength Steel Sheets. Metall Mater Trans A 50, 884–893 (2019). https://doi.org/10.1007/s11661-018-5043-z

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  • DOI: https://doi.org/10.1007/s11661-018-5043-z

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