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Effects of Zr addition on evolution behavior of inclusions in EH36 shipbuilding steel: from casting to welding

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Abstract

The inclusions evolution behavior in the continuous casting slab, rolled plates, and simulated welding samples of EH36 steels with and without Zr addition has been systematically investigated. The inclusions in plain EH36 steel are almost composed of Al–Ca–S–O(–Mn) and undergo negligible changes during the whole process. With Zr addition, a large amount of individually fine MnS precipitates and Zr-containing inclusions are generated. In the rolled EH36-Zr sample, Zr-containing complex inclusions are effective to promote the nucleation of acicular ferrite on the surface, which are hardly found in the simulated welding sample of EH36-Zr steel due to the segregation of soluble Ti and Zr on the grain boundary.

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Acknowledgements

The authors would like to acknowledge National Natural Science Foundation of China (Grant Nos. 51622401 and 51628402), National Key Research and Development Program of China (2016YFB0300602) and Global Talents Recruitment Program (1000 Plan) for the financial supports. The supports from Research Fund for Central Universities (N150205001), Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences (2015KF04), and State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology (AWJ-16-Z04) are also appreciated.

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Shenyang, 110819, Liaoning, China

    Xiao-dong Zou, Jin-cheng Sun, Da-peng Zhao & Cong Wang

  2. Department of Materials Engineering, The University of Tokyo, Tokyo, 113-8656, Japan

    Hiroyuki Matsuura

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  1. Xiao-dong Zou
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  2. Jin-cheng Sun
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  3. Da-peng Zhao
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  4. Hiroyuki Matsuura
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  5. Cong Wang
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Correspondence to Cong Wang.

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Zou, Xd., Sun, Jc., Zhao, Dp. et al. Effects of Zr addition on evolution behavior of inclusions in EH36 shipbuilding steel: from casting to welding. J. Iron Steel Res. Int. 25, 164–172 (2018). https://doi.org/10.1007/s42243-018-0022-6

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  • DOI: https://doi.org/10.1007/s42243-018-0022-6

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