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Static fracture toughness of ultra-fine grained steels processed by thermo-mechanical warm rolling

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Abstract

Ultra-fine grained steels were recently developed by thermo-mechanical warm rolling. Their low-temperature fracture toughness was evaluated in terms of crack tip opening displacement (CTOD) in this paper. Effect of temperature on CTOD and the correlation between CTOD and grain size were investigated, and the experimental results showed that refining ferrite grains can increase the fracture toughness of steel and lower the sensitivity of fracture toughness to temperature. The fracture toughness of the developed ultra-fine grained steels was superior to that of hot-rolled steel SM490B with similar chemical composition.

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Authors and Affiliations

  1. Materials Reliability Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan

    Hai Qiu, Keitaro Enami, Kazuo Hiraoka & Kotobu Nagai

  2. Faculty of Science and Technology, Sophia University, 7-1 Kioi, Chiyoda, Tokyo, 102-8554, Japan

    Yukito Hagihara

Authors
  1. Hai Qiu
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  2. Keitaro Enami
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  3. Kazuo Hiraoka
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  4. Kotobu Nagai
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  5. Yukito Hagihara
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Correspondence to Hai Qiu.

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Qiu, H., Enami, K., Hiraoka, K. et al. Static fracture toughness of ultra-fine grained steels processed by thermo-mechanical warm rolling. J Mater Sci 43, 1910–1913 (2008). https://doi.org/10.1007/s10853-007-2430-z

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  • DOI: https://doi.org/10.1007/s10853-007-2430-z

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