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<p>Spatial variations in cooling rate during electro-gas welding of EH36 steel produce heterogeneous <i>δ</i> grain sizes in the weld metal, ranging from 118.9 <i>μ</i>m in the columnar grain zone (CGZ) to 41.3 <i>μ</i>m in the equiaxed grain zone (EGZ). Correspondingly, the prior austenite grain (PAG) size decreases from 191.9 to 70.1 <i>μ</i>m. Larger PAGs in the CGZ promote acicular ferrite formation, whereas smaller PAGs in the EGZ favor bainite formation, leading to pronounced microstructural inhomogeneity.</p>

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Prior Austenite Grain Size Enabled Microstructural Inhomogeneity in the Electro-Gas Weld Metal of EH36 Shipbuilding Steel

  • 期刊论文

  • 发表日期：

    2026年7月17日

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  • Yibo Wan,
  • Xu Xie,
  • Ming Zhong,
  • Bin Yu,
  • Yongwu Wu,
  • Cong Wang

摘要

Spatial variations in cooling rate during electro-gas welding of EH36 steel produce heterogeneous δ grain sizes in the weld metal, ranging from 118.9 μm in the columnar grain zone (CGZ) to 41.3 μm in the equiaxed grain zone (EGZ). Correspondingly, the prior austenite grain (PAG) size decreases from 191.9 to 70.1 μm. Larger PAGs in the CGZ promote acicular ferrite formation, whereas smaller PAGs in the EGZ favor bainite formation, leading to pronounced microstructural inhomogeneity.