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<p>Weld metal microstructures of EH36 shipbuilding steel, processed by electro-gas welding with varying CaF<sub>2</sub>–SiO<sub>2</sub> flux-cored wires, have been investigated. Quantified data indicate that introducing SiO<sub>2</sub> leads to an appreciable uptake of acicular ferrite fraction and a simultaneous decrease in bainite. Such microstructural evolution has been primarily attributed to the reduced levels of C and Mn (from 0.151 to 0.137 wt pct and 2.058 to 1.744 wt pct, respectively), which are primarily enabled by SiO<sub>2</sub> decomposition.</p>

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Alloying Element Variation-Induced Microstructural Responses in Electro-Gas Welded Metals Subjected to CaF2–SiO2 Flux-Cored Wires

  • 期刊论文

  • 发表日期：

    2025年7月6日

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  • Yibo Wan,
  • Ming Zhong,
  • Xu Xie,
  • Xiaodong Zou,
  • Imants Kaldre,
  • Cong Wang

摘要

Weld metal microstructures of EH36 shipbuilding steel, processed by electro-gas welding with varying CaF2–SiO2 flux-cored wires, have been investigated. Quantified data indicate that introducing SiO2 leads to an appreciable uptake of acicular ferrite fraction and a simultaneous decrease in bainite. Such microstructural evolution has been primarily attributed to the reduced levels of C and Mn (from 0.151 to 0.137 wt pct and 2.058 to 1.744 wt pct, respectively), which are primarily enabled by SiO2 decomposition.