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Ferrite features in simulated transition zone of EH36 shipbuilding steel submerged arc welded by CaF2–SiO2–MnO fluxes

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Abstract

Ferrite features in the simulated transition zone welded with CaF2–SiO2–MnO fluxes containing various MnO contents have been investigated. Confocal laser scanning microscopy has been applied to simulate the thermal cycling of the transition zone and the phase transformations during cooling have been in-situ observed. It has been found that the appearance temperature for ferrite side plate decreases with increasing Mn content in the weld metals caused by MnO content increasing. Meanwhile, growth rates for both ferrite side plate and acicular ferrite are significantly enhanced with a higher Mn content of weld metal. Furthermore, from the statistical fractions of salient microstructures, for all samples, the acicular ferrite, grain boundary ferrite, and polygonal ferrite take over more than 90%. It has also been demonstrated that with the increase in Mn content, the ferrite side plate fraction increases slightly from 5% to 10% and the acicular ferrite fraction shows a tendency of first increasing and then decreasing, which experiences the maximum with the flux containing 30 wt.% MnO. This phenomenon is believed to be controlled by the O and Mn contents in weld metals synergistically.

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Acknowledgements

The authors sincerely thank the Spring Sunshine Plan (Chunhui) Research Project of Ministry of Education of China (Grant No. HZKY20220437), the State Key Laboratory of Refractories and Metallurgy (Grant No. G202206), the National Natural Science Foundation of China (Grant Nos. U20A20277 and 52150610494), and the National Key Research and Development Program of China (Grant No. 2022YFE0123300).

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Authors and Affiliations

  1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang, 110819, Liaoning, China

    Ming Zhong, Dong Hu, Da-ming Guo & Cong Wang

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

    Ming Zhong, Dong Hu, Da-ming Guo & Cong Wang

  3. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Ming Zhong

  4. Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai, 400076, Maharashtra, India

    Somnath Basu

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  1. Ming Zhong
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Correspondence to Ming Zhong.

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Ming Zhong is a youth editorial board member and Cong Wang is an editorial board member for Journal of Iron and Steel Research International and were not involved in the editorial review or the decision to publish this article. The authors have no relevant financial or nonfinancial interests to disclose.

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Zhong, M., Hu, D., Guo, Dm. et al. Ferrite features in simulated transition zone of EH36 shipbuilding steel submerged arc welded by CaF2–SiO2–MnO fluxes. J. Iron Steel Res. Int. 31, 790–796 (2024). https://doi.org/10.1007/s42243-023-01162-6

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