Scholarlink

<p>A dissimilar weld joint between 316L stainless steel (SS) and Grade 91 steel was successfully fabricated via electron beam welding (EBW). The full penetration was achieved at electron beam current of 45&#xa0;mA, while incomplete fusion occurred at lower currents (25-35&#xa0;mA). Microstructural characterization demonstrated that the fusion zone primarily comprised martensite with minor austenite, resulting from rapid cooling kinetics. The fusion zone showed high hardness, while the overall joint performance was limited by the HAZ near the 316L SS side, a consequence of the solid-solution strengthening and the dislocation strengthening formed in the fusion zone under the extreme cooling rates of EBW. Tensile and charpy impact failure localized at the heat-affected zone near 316L SS side, attributed to strain partitioning to the softer austenitic phase. Corrosion assessments in 3.5&#xa0;wt.% NaCl and 1&#xa0;mol/L H<sub>2</sub>SO<sub>4</sub> solution showed the weld’s corrosion resistance ranked between the two base metals, outperforming Grade 91&#xa0;steel but remaining inferior to 316L SS. These findings provide fundamental microstructural and mechanical insights into as-welded 316L SS-Grade 91 steel dissimilar joints, which may inform future research toward potential energy-sector applications.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Study on the Microstructure and Properties of Electron Beam Welded 316L SS-Grade 91 Steel Dissimilar Weld Joint

  • 期刊论文

  • 发表日期：

    2026年7月27日

查看全文
  • Xueping Ding,
  • Shihui Wang,
  • Kehan Li,
  • Yuan Gong,
  • Jipeng Qiu

摘要

A dissimilar weld joint between 316L stainless steel (SS) and Grade 91 steel was successfully fabricated via electron beam welding (EBW). The full penetration was achieved at electron beam current of 45 mA, while incomplete fusion occurred at lower currents (25-35 mA). Microstructural characterization demonstrated that the fusion zone primarily comprised martensite with minor austenite, resulting from rapid cooling kinetics. The fusion zone showed high hardness, while the overall joint performance was limited by the HAZ near the 316L SS side, a consequence of the solid-solution strengthening and the dislocation strengthening formed in the fusion zone under the extreme cooling rates of EBW. Tensile and charpy impact failure localized at the heat-affected zone near 316L SS side, attributed to strain partitioning to the softer austenitic phase. Corrosion assessments in 3.5 wt.% NaCl and 1 mol/L H2SO4 solution showed the weld’s corrosion resistance ranked between the two base metals, outperforming Grade 91 steel but remaining inferior to 316L SS. These findings provide fundamental microstructural and mechanical insights into as-welded 316L SS-Grade 91 steel dissimilar joints, which may inform future research toward potential energy-sector applications.