Impact toughness variations of EH36 weld metal treated by CaF2–SiO2–MnO submerged arc welding flux
Ming Zhong1,2,3, Da-ming Guo1,2, Somnath Basu4, Cong Wang1,2
1 Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang 110819, Liaoning, China 2 School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China 3 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China 4 Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai 400076, Maharashtra, India
Impact toughness variations of EH36 weld metal treated by CaF2–SiO2–MnO submerged arc welding flux
Ming Zhong1,2,3, Da-ming Guo1,2, Somnath Basu4, Cong Wang1,2
1 Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang 110819, Liaoning, China 2 School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China 3 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China 4 Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai 400076, Maharashtra, India
摘要 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.
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.
Ming Zhong,Da-ming Guo,Somnath Basu, et al. Impact toughness variations of EH36 weld metal treated by CaF2–SiO2–MnO submerged arc welding flux[J]. Journal of Iron and Steel Research International, 2023, 30(09): 1873-1878.
2023, Vol. 30 
