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An Integrated Study on the Evolution of Inclusions in EH36 Shipbuilding Steel with Mg Addition: From Casting to Welding

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Abstract

Inclusion evolution behaviors, in terms of composition, size, and number density, and associated influence on the microstructures of the as-cast slabs, rolled plates, and simulated welded samples of plain EH36 and EH36-Mg shipbuilding steels have been systematically investigated. The results indicate that the inclusions in the as-cast plain EH36 are almost Al-Ca-S-O-(Mn) complex oxides with sizes ranging from 1.0 to 2.0 μm. After Mg addition, a large amount of individually fine MnS precipitates and Mg-containing Ti-Al-Mg-O-(Mn-S) complex inclusions are generated, which significantly refine the microstructure and are conducive to the nucleation of acicular ferrite in the rolled and welded sample. Moreover, after rolling and welding thermal simulation, the number of individual MnS decreases gradually due to its precipitation on the surface of Ti-Al-Mg-O oxides.

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Acknowledgments

The authors feel immensely grateful to the enabling financial support from National Natural Science Foundation of China (51622401 and 51628402), National Key Research and Development Program of China (2016YFB0300602), and Global Talents Recruitment Program endowed by the Chinese Government. We would also like to thank the support 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).

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Authors and Affiliations

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

    Xiaodong Zou, Dapeng Zhao, Jincheng Sun & Cong Wang

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

    Hiroyuki Matsuura

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  1. Xiaodong Zou
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  2. Dapeng Zhao
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  3. Jincheng Sun
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  4. Cong Wang
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  5. Hiroyuki Matsuura
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Correspondence to Cong Wang.

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Manuscript submitted August 15, 2017.

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Zou, X., Zhao, D., Sun, J. et al. An Integrated Study on the Evolution of Inclusions in EH36 Shipbuilding Steel with Mg Addition: From Casting to Welding. Metall Mater Trans B 49, 481–489 (2018). https://doi.org/10.1007/s11663-017-1163-x

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