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Effective microstructure unit in control of impact toughness in CGHAZ for high strength bridge steel

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Abstract

The high strength bridge steel was processed with the simulated coarse grain heat affected zone (CGHAZ) thermal cycle with heat input varying from 30 to 60 kJ/cm, the microstructures were investigated by means of optical microscope (OM), scanning electron microscope (SEM), electron backscattering diffraction (EBSD) and transmission electron microscope (TEM), and the impact properties were evaluated from the welding thermal cycle treated samples. The results indicate that the microstructure is primarily composed of lath bainite. With decreasing heat input, both bainite packet and block are significantly refined, and the toughness has an increasing tendency due to the grain refinement. The fracture surfaces all present cleavage or fracture for the samples with different heat inputs. Moreover, the average cleavage facet size for the CGHAZ is nearly equal to the average bainite packet size and the bainitic packet boundary can strongly impede the crack propagation, indicating that the bainitic packet is the most effective unit in control of impact toughness in the simulated CGHAZ of high strength bridge steel.

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Acknowledgments

Thanks for the supporting tests of State Key Laboratory of Material Processing and Die & Mould Technology and Analysis and Test Center in Huazhong University of Science and Technology.

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Authors and Affiliations

  1. State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China

    Xiuzhi Yang  (杨秀芝), Lichao Zhang  (张李超), Yusheng Shi  (史玉升) & Shengfu Yu

  2. Institute of Mechanical Engineering, Hubei Polytechnic University, Huangshi, 435003, China

    Xiuzhi Yang  (杨秀芝), Chunfa Dong & Wenlin Hua

  3. Institute of Mechanical Engineering, Wuhan Textile University, Wuhan, 430073, China

    Xuan Li

Authors
  1. Xiuzhi Yang  (杨秀芝)
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  2. Lichao Zhang  (张李超)
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  3. Yusheng Shi  (史玉升)
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  4. Shengfu Yu
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  6. Wenlin Hua
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  7. Xuan Li
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Corresponding authors

Correspondence to Lichao Zhang  (张李超) or Yusheng Shi  (史玉升).

Additional information

Supported by the National 863 Program of China (No.2015AA042505), State Key Laboratory of Materials Processing and Die & Mould Technology of Huazhong University of Science and Technology (No.P2018-014), Major Science and Technology Project in Guangdong Province (No.2014B010130001)

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Yang, X., Zhang, L., Shi, Y. et al. Effective microstructure unit in control of impact toughness in CGHAZ for high strength bridge steel. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 33, 177–184 (2018). https://doi.org/10.1007/s11595-018-1803-2

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  • DOI: https://doi.org/10.1007/s11595-018-1803-2

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