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Notch-Fatigue Properties of Advanced TRIP-Aided Bainitic Ferrite Steels

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Abstract

To develop a transformation-induced plasticity (TRIP)-aided bainitic ferrite steel (TBF steel) with high hardenability for a common rail of the next generation diesel engine, 0.2 pct C-1.5 pct Si-1.5 pct Mn-0.05 pct Nb TBF steels with different contents of Cr, Mo, and Ni were produced. The notch-fatigue strength of the TBF steels was investigated and was related to the microstructural and retained austenite characteristics. If Cr, Mo, and/or Ni were added to the base steel, then the steels achieved extremely higher notch-fatigue limits and lower notch sensitivity than base TBF steel and the conventional structural steels. This was mainly associated with (1) carbide-free and fine bainitic ferrite lath structure matrix without proeutectoid ferrite, (2) a large amount of fine metastable retained austenite, and (3) blocky martensite phase including retained austenite, which may suppress a fatigue crack initiation and propagation.

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Acknowledgments

This study was supported by grants from Adaptable and Seamless Technology Transfer Program through target-driven R&D, Japan Science and Technology Agency, and the Grant-in-Aid for Scientific Research (B), The Ministry of Education, Science, Sports and Culture, Japan (No.2008-20360311).

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Authors and Affiliations

  1. Graduate School, Shinshu University, 4-17-1, Wakasato, Nagano, 380-8553, Japan

    Nobuo Yoshikawa (Graduate Student) & Junya Kobayashi (Graduate Student)

  2. Department of Mechanical Systems Engineering, Shinshu University, 4-17-1, Wakasato, Nagano, 380-8553, Japan

    Koh-ichi Sugimoto (Professor)

Authors
  1. Nobuo Yoshikawa
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  2. Junya Kobayashi
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  3. Koh-ichi Sugimoto
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Correspondence to Koh-ichi Sugimoto.

Additional information

Manuscript submitted December 18, 2011.

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Yoshikawa, N., Kobayashi, J. & Sugimoto, Ki. Notch-Fatigue Properties of Advanced TRIP-Aided Bainitic Ferrite Steels. Metall Mater Trans A 43, 4129–4136 (2012). https://doi.org/10.1007/s11661-012-1246-x

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