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Impact toughness scattering of bainitic steel in the ductile-brittle transition temperature region

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Abstract

The impact toughness scattering in the ductile-brittle transition temperature (DBTT) region was experimentally examined on mixed and homogeneous grains of low alloy high strength bainitic steel under dynamic loading conditions. The results revealed that the mixed grain microstructure had larger impact toughness scattering than the homogeneous one, and the impact toughness scattering was mainly caused by the scattering in the cleavage fracture stress σ f. The value of σ f is related to the size of the microcrack formed in the bainitic packet. When a bainitic packet-sized microcrack propagates from one bainitic packet into the adjacent packet, cleavage fracture occurs. The cleavage fracture is controlled by the few coarse packets in the microstructures, and the σ f scattering is influenced by the varied distances/relative locations between these coarse packets, and homogenizing the distribution of fine bainitic packet sizes is an effective way to reduce the impact toughness scattering in the DBTT region.

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Authors and Affiliations

  1. State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Kun Shi  (石昆), Jiangbiao Chen, Lingti Kong, Jinfu Li & Hanqian Zhang  (张汉谦)

  2. School of Materials and Metallurgy, Northeastern University, Shenyang, 110004, China

    Hong Hou

  3. Baosteel Research Institute, Baoshan Iron & Steel Co.,Ltd., Shanghai, 201900, China

    Hanqian Zhang  (张汉谦)

Authors
  1. Kun Shi  (石昆)
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  2. Jiangbiao Chen
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  3. Hong Hou
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  4. Lingti Kong
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  5. Jinfu Li
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  6. Hanqian Zhang  (张汉谦)
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Corresponding author

Correspondence to Hanqian Zhang  (张汉谦).

Additional information

Sponsored by the National Basic Research Program of China (No. 2011CB610405), the Reactor Material Development Research Project of Shanghai Baoshan Iron & Steel Research Institute (No. X08ECEJ190)

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Shi, K., Chen, J., Hou, H. et al. Impact toughness scattering of bainitic steel in the ductile-brittle transition temperature region. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 31, 636–643 (2016). https://doi.org/10.1007/s11595-016-1422-8

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  • DOI: https://doi.org/10.1007/s11595-016-1422-8

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