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Delayed cracking in hot stamping with hot trimming for ultra-high strength steel components

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Abstract

Hydrogen-induced delayed cracking in hot stamping with hot trimming for ultra-high strength steel components at various trimming temperatures was investigated. The trimming temperature of a heated quenchable sheet was adjusted by rapid cooling with the upper punch and die, and then, the sheet was trimmed and die-quenched. A cathode hydrogen charging test was performed to examine the occurrence of delayed cracking at trimmed edges, and then, tensile strength and total elongation of the hydrogen-charged specimen were measured from the tensile test. Below, a martensite transformation start temperature of 420 °C, the fracture surface and the tensile residual stress became large, and delayed cracking was caused on the fracture surfaces of the sheared edges. Although no delayed cracking of the hydrogen-charged specimen occurred above 420 °C, the tensile strength and total elongation were reduced by hydrogen embrittlement. The critical temperature of delayed cracking for a thin sheet having 1.0 mm in thickness rose to 600 °C.

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Funding

This work was supported by JSPS KAKENHI Grant-in-Aid for Scientific Research (B) of Number JP18H01749.

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Authors and Affiliations

  1. Department of Mechanical Engineering, School of Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo, Japan

    Yuki Nakagawa

  2. Department of Mechanical Engineering, Toyohashi University of Technology, Toyohashi, Aichi, 441-8580, Japan

    Ken-ichiro Mori & Ryo Umemiya

  3. Division of Systems Research, Faculty of Engineering, Yokohama National University, Yokohama, Kanagawa, 240-8501, Japan

    Tomoyoshi Maeno

Authors
  1. Yuki Nakagawa
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  2. Ken-ichiro Mori
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  3. Tomoyoshi Maeno
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  4. Ryo Umemiya
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Correspondence to Yuki Nakagawa.

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Nakagawa, Y., Mori, Ki., Maeno, T. et al. Delayed cracking in hot stamping with hot trimming for ultra-high strength steel components. Int J Adv Manuf Technol 105, 5081–5090 (2019). https://doi.org/10.1007/s00170-019-04599-w

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  • DOI: https://doi.org/10.1007/s00170-019-04599-w

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