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<p>Wire arc additive manufacturing of SS304L–Inconel 718 bimetallic wall was fabricated by using the cold metal transfer technique with the optimal parameters (current = 160 A, welding speed = 300&#xa0;mm/min). It can be inferred that a thin interface developed between the SS304L–IN718 wall, with no evidence of crack or fissure formation. The WAAM-processed SS304L features columnar and equiaxed microstructures, whereas the IN718 exhibits dendritic structures. The existence of Laves phase in the IN718 and interface region was identified from SEM analysis. Energy-dispersive x-ray spectroscopy elemental mapping reveals a gradual transition of elements (Fe, Ni, and Cr) across the interface with minimal segregation from IN718 to SS304L region. Electron backscatter diffraction analysis of an interface region shows continuous crystallographic growth characterized by large, elongated grains with consistent orientation. To validate the above-mentioned metallurgical characteristics, the investigation on mechanical properties was performed. The microhardness results exhibit a consistent range of 215.9–231.0 HV for SS304L, 169.1–183.0 HV for interface and 240.3–253.5 HV for IN718. The tensile analysis was carried out for two orientations (0° and 90°). Results exhibit the UTS of IN718 and SS304L enhancement by 7.03% and 6.30%, respectively, due to the existence of finer grains caused by low heat input. The WAAM process shows the ability to fabricate bimetallic components with controlled properties. </p>

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Mechanical and Metallurgical Properties of SS304L–IN718 Bimetallic Wall Deposited using Cold Metal Transfer

  • 期刊论文

  • 发表日期：

    2025年5月16日

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  • D. Vinoth Kumar,
  • A. Karpagaraj,
  • T. G. Loganathan

摘要

Wire arc additive manufacturing of SS304L–Inconel 718 bimetallic wall was fabricated by using the cold metal transfer technique with the optimal parameters (current = 160 A, welding speed = 300 mm/min). It can be inferred that a thin interface developed between the SS304L–IN718 wall, with no evidence of crack or fissure formation. The WAAM-processed SS304L features columnar and equiaxed microstructures, whereas the IN718 exhibits dendritic structures. The existence of Laves phase in the IN718 and interface region was identified from SEM analysis. Energy-dispersive x-ray spectroscopy elemental mapping reveals a gradual transition of elements (Fe, Ni, and Cr) across the interface with minimal segregation from IN718 to SS304L region. Electron backscatter diffraction analysis of an interface region shows continuous crystallographic growth characterized by large, elongated grains with consistent orientation. To validate the above-mentioned metallurgical characteristics, the investigation on mechanical properties was performed. The microhardness results exhibit a consistent range of 215.9–231.0 HV for SS304L, 169.1–183.0 HV for interface and 240.3–253.5 HV for IN718. The tensile analysis was carried out for two orientations (0° and 90°). Results exhibit the UTS of IN718 and SS304L enhancement by 7.03% and 6.30%, respectively, due to the existence of finer grains caused by low heat input. The WAAM process shows the ability to fabricate bimetallic components with controlled properties.