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Impact toughness variations of EH36 weld metal treated by CaF2–SiO2–MnO submerged arc welding flux

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Abstract

Fused ternary CaF2–SiO2–MnO fluxes have been manufactured and applied to join EH36 shipbuilding steel under high heat input submerged arc welding. Five fluxes have been designed to clarify the effect of MnO content in CaF2–SiO2–MnO flux on the impact toughness of the weld metal, with the added amount of MnO from 10 to 50 wt.% at the expense of CaF2. With the increase in MnO content, the Charpy impact energy increases first and then decreases, experiencing a maximum value at 30 wt.% MnO. Microstructure of the weld metals has also been studied to account for impact toughness variations. It has been demonstrated that the highest acicular ferrite volume fraction in the weld metal is achieved at 30 wt.% MnO, which is concurrent to the maximum value of Charpy impact energy. It is believed that the Mn and O content variations in the weld metal contribute synergistically to such an interesting phenomenon.

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Acknowledgements

The authors sincerely thank the State Key Laboratory of Refractories and Metallurgy (Grant No. G202206), National Natural Science Foundation of China (Grant Nos. U20A20277 and 52150610494), and 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, Da-ming Guo & Cong Wang

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

    Ming Zhong, 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 Cong Wang.

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Zhong, M., Guo, Dm., Basu, S. et al. Impact toughness variations of EH36 weld metal treated by CaF2–SiO2–MnO submerged arc welding flux. J. Iron Steel Res. Int. 30, 1873–1878 (2023). https://doi.org/10.1007/s42243-023-01017-0

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  • DOI: https://doi.org/10.1007/s42243-023-01017-0

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