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Effects of Microalloying on the Impact Toughness of Ultrahigh-Strength TRIP-Aided Martensitic Steels

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Abstract

The effects of the addition of Cr, Mo, and/or Ni on the Charpy impact toughness of a 0.2 pct C-1.5 pct Si-1.5 pct Mn-0.05 pct Nb transformation-induced plasticity (TRIP)-aided steel with a lath-martensite structure matrix (i.e., a TRIP-aided martensitic steel or TM steel) were investigated with the aim of using the steel in automotive applications. In addition, the relationship between the toughness of the various alloyed steels and their metallurgical characteristics was determined. When Cr, Cr-Mo, or Cr-Mo-Ni was added to the base steel, the TM steel exhibited a high upper-shelf Charpy impact absorbed value that ranged from 100 to 120 J/cm2 and a low ductile–brittle fracture appearance transition temperature that ranged from 123 K to 143 K (−150 °C to −130 °C), while also exhibiting a tensile strength of about 1.5 GPa. This impact toughness of the alloyed steels was far superior to that of conventional martensitic steel and was caused by the presence of (i) a softened wide lath-martensite matrix, which contained only a small amount of carbide and hence had a lower carbon concentration, (ii) a large amount of finely dispersed martensite-retained austenite complex phase, and (iii) a metastable retained austenite phase of 2 to 4 vol pct in the complex phase, which led to plastic relaxation via strain-induced transformation and played an important role in the suppression of the initiation and propagation of voids and/or cleavage cracks.

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Acknowledgments

This study was supported by Grants from the Adaptable and Seamless Technology Transfer Program through Target-driven R&D, the Japan Science and Technology Agency.

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Authors and Affiliations

  1. Japan Society for the Promotion of Science, Shinshu University, 4-17-1 Wakasato, Nagano, 380-8553, Japan

    Junya Kobayashi (Research Fellow)

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

    Daiki Ina (Graduate Student) & Yuji Nakajima (Graduate Student)

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

    Koh-ichi Sugimoto (Professor)

Authors
  1. Junya Kobayashi
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  2. Daiki Ina
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  3. Yuji Nakajima
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  4. Koh-ichi Sugimoto
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Corresponding author

Correspondence to Junya Kobayashi.

Additional information

Manuscript submitted February 27, 2013.

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Kobayashi, J., Ina, D., Nakajima, Y. et al. Effects of Microalloying on the Impact Toughness of Ultrahigh-Strength TRIP-Aided Martensitic Steels. Metall Mater Trans A 44, 5006–5017 (2013). https://doi.org/10.1007/s11661-013-1882-9

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  • DOI: https://doi.org/10.1007/s11661-013-1882-9

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