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<p>The joining of dissimilar materials is essential due to the aerospace, nuclear, and defense application requirements. The present work focuses on the weldability of dissimilar metals, Inconel 718-super duplex stainless steel 2507 (SSDS 2507). Laser welding with varying heat inputs ranging from 2&#xa0;kJ/mm to 1.2&#xa0;kJ/mm was used to prepare butt welds. The welding speed was varied from 60&#xa0;mm/min to 100&#xa0;mm/min to control the heat input. Mechanical and metallurgical characterization was performed to study the behavior of the Inconel 718-SDSS 2507 dissimilar weld joint. The weld metal microstructure showed the formation of the Cr<sub>23</sub>C6, Mo<sub>2</sub>C, and Nb<sub>2</sub>C precipitates and the Laves phase. The volumetric fraction of secondary phase formation is 8.65%, and the maximum ultimate tensile strength attained the value of 864&#xa0;MPa at the heat input of 1.33&#xa0;kJ/mm. Grain coarsening and hardness dipping were examined at the range of the heat-affected zone in the SDSS 2507 side for every case.</p>

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Microstructure and Mechanical Properties of Dissimilar Inconel 718-SDSS 2507 Laser Welds with Varying Heat Input

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • S. Anilkumar,
  • Anoj Giri

摘要

The joining of dissimilar materials is essential due to the aerospace, nuclear, and defense application requirements. The present work focuses on the weldability of dissimilar metals, Inconel 718-super duplex stainless steel 2507 (SSDS 2507). Laser welding with varying heat inputs ranging from 2 kJ/mm to 1.2 kJ/mm was used to prepare butt welds. The welding speed was varied from 60 mm/min to 100 mm/min to control the heat input. Mechanical and metallurgical characterization was performed to study the behavior of the Inconel 718-SDSS 2507 dissimilar weld joint. The weld metal microstructure showed the formation of the Cr23C6, Mo2C, and Nb2C precipitates and the Laves phase. The volumetric fraction of secondary phase formation is 8.65%, and the maximum ultimate tensile strength attained the value of 864 MPa at the heat input of 1.33 kJ/mm. Grain coarsening and hardness dipping were examined at the range of the heat-affected zone in the SDSS 2507 side for every case.