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<p>The microstructure and mechanical properties of Inconel 718 superalloy were studied using double pulse metal inert gas (DP-MIG) welding process at different thermal pulse frequencies (<i>T</i><sub>F</sub>) such as 2, 5 and 8&#xa0;Hz. Microstructures shows coarser as well as elongated grain morphology with columnar dendritic structure. The intensity and volume fraction of <i>γ</i>′ and <i>γ</i>′′ phase vary as <i>T</i><sub>F</sub> increases which was noticed from x-ray diffraction analysis (XRD). From electron backscattered diffraction (EBSD) technique, the % of low-angle grain boundaries (LAGBs) increases, whereas the % of high-angle grain boundaries (HAGBs) decreases as <i>T</i><sub>F</sub> increases. Better ultimate tensile strength (UTS) of 705&#xa0;MPa at a <i>T</i><sub>F</sub> of 5&#xa0;Hz with a joint efficiency of 90% of the base metal (789&#xa0;MPa) than other weldments is observed. The presence of dimple network, microcracks and cleavage facets ensures the ductile mode of fracture.</p>

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Effect of Thermal Pulse Frequency on Microstructural and Mechanical Properties of Inconel 718 Superalloy by Double Pulse Metal Inert Gas Welding

  • 期刊论文

  • 发表日期：

    2025年6月19日

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  • M. Shantharaj,
  • Thangaraju Rajasekaran

摘要

The microstructure and mechanical properties of Inconel 718 superalloy were studied using double pulse metal inert gas (DP-MIG) welding process at different thermal pulse frequencies (TF) such as 2, 5 and 8 Hz. Microstructures shows coarser as well as elongated grain morphology with columnar dendritic structure. The intensity and volume fraction of γ′ and γ′′ phase vary as TF increases which was noticed from x-ray diffraction analysis (XRD). From electron backscattered diffraction (EBSD) technique, the % of low-angle grain boundaries (LAGBs) increases, whereas the % of high-angle grain boundaries (HAGBs) decreases as TF increases. Better ultimate tensile strength (UTS) of 705 MPa at a TF of 5 Hz with a joint efficiency of 90% of the base metal (789 MPa) than other weldments is observed. The presence of dimple network, microcracks and cleavage facets ensures the ductile mode of fracture.