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<p>MnO–SiO<sub>2</sub>–TiO<sub>2</sub> fluxes of known compositions have been applied to manufacture submerged arc welding of EH550 offshore engineering steel. It has been found that the volume fraction of acicular ferrite (AF) decreases slightly from 60 to 52 pct with an increase in TiO<sub>2</sub>. Concurrently, morphologies of AFs transform from typical bulky to slender shape, resulting in a striking increase in aspect ratio from 5.62 to 8.01, boding well toward enhanced fracture toughness for the weld metal.</p>

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Acicular Ferrite Aspect Ratio Variations in the Weld Metal of EH550 Offshore Engineering Steel Processed by MnO–SiO2–TiO2 Fluxes

  • 期刊论文

  • 发表日期：

    2025年5月28日

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  • Junjie Ma,
  • Ming Zhong,
  • Yanyun Zhang,
  • Xiaobo Yuan,
  • Imants Kaldre,
  • Ishwar Kapoor,
  • Peter Janos Szabo,
  • Cong Wang

摘要

MnO–SiO2–TiO2 fluxes of known compositions have been applied to manufacture submerged arc welding of EH550 offshore engineering steel. It has been found that the volume fraction of acicular ferrite (AF) decreases slightly from 60 to 52 pct with an increase in TiO2. Concurrently, morphologies of AFs transform from typical bulky to slender shape, resulting in a striking increase in aspect ratio from 5.62 to 8.01, boding well toward enhanced fracture toughness for the weld metal.