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<p>In the past decade, dissimilar material joining has been popularized due to the requirement in various sectors such as aerospace, nuclear, and defense. The proposed work aims to join dissimilar metals, Inconel718 (IN718), to super duplex stainless steel 2507 (SDSS2507). Activated tungsten inert gas welding was performed to prepare the butt weld. The welding speed was varied in the range of 70 to 110&#xa0;mm/min to prepare the IN718-SDSS2507 dissimilar butt welds. Researchers performed mechanical and metallurgical studies to examine the behavior of welds. The weld metal microstructure showed the presence of the carbide’s precipitates Cr<sub>23</sub>C<sub>6</sub>, Mo<sub>2</sub>C, Nb<sub>2</sub>C precipitates, and Laves phase. The molybdenum and niobium segregation were decreased because the heat input decreased from 1.78 to 1.13&#xa0;kJ/mm. The maximum ultimate tensile strength, 844&#xa0;MPa, was attained at 90&#xa0;mm/min welding speed. The volumetric fraction of secondary phase formation reached 12.47% at a heat input (HI) of 1.39&#xa0;kJ/mm. Grain coarsening and hardness dipping were observed in the heat-affected zone of the SDSS2507 side. An in-depth examination of the relationship between microstructure and mechanical properties in A-TIG IN718-SSDS2507 weld joints was discussed.</p>

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Mechanical and microstructural studies on the Inconel718-SDSS2507 A-TIG dissimilar welded joints

  • 期刊论文

  • 发表日期：

    2025年2月18日

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  • Anilkumar S,
  • Anoj Giri

摘要

In the past decade, dissimilar material joining has been popularized due to the requirement in various sectors such as aerospace, nuclear, and defense. The proposed work aims to join dissimilar metals, Inconel718 (IN718), to super duplex stainless steel 2507 (SDSS2507). Activated tungsten inert gas welding was performed to prepare the butt weld. The welding speed was varied in the range of 70 to 110 mm/min to prepare the IN718-SDSS2507 dissimilar butt welds. Researchers performed mechanical and metallurgical studies to examine the behavior of welds. The weld metal microstructure showed the presence of the carbide’s precipitates Cr23C6, Mo2C, Nb2C precipitates, and Laves phase. The molybdenum and niobium segregation were decreased because the heat input decreased from 1.78 to 1.13 kJ/mm. The maximum ultimate tensile strength, 844 MPa, was attained at 90 mm/min welding speed. The volumetric fraction of secondary phase formation reached 12.47% at a heat input (HI) of 1.39 kJ/mm. Grain coarsening and hardness dipping were observed in the heat-affected zone of the SDSS2507 side. An in-depth examination of the relationship between microstructure and mechanical properties in A-TIG IN718-SSDS2507 weld joints was discussed.