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<p>Pulsed gas tungsten arc welding-based wire arc additive manufacturing (GTAW–WAAM) was employed to fabricate an Alloy 82 (ERNiCr-03) wall structure with refined grain morphology through suppression of niobium segregation. The investigation on the built-up WAAM structure was analyzed through metallographic and mechanical characterizations. The machined cross section of the Alloy 82 WAAM was examined to investigate metallography studies, which revealed the presence of columnar dendrites in the bottom layer of the deposition. As the deposition layer increased, the occurrence of equiaxed grains was observed. It was noted that there was no solidification cracking during the deposition, but the solidified grain boundaries (SGBs) and migrated grain boundaries (MGBs) were observed despite having a fully γ austenitic matrix. The precipitation of MC carbide and traces of Laves phase were noticed at the bottom region of the WAAM, comparatively less in the top areas. The x-ray diffraction (XRD) peaks indicate the γ-(Ni), γ’-(Ni<sub>3</sub>Al), γ”-(Ni<sub>3</sub>Cr), and primary carbide precipitate (NiC) phases, and the WAAM-built Alloy 82 exhibited a hardness range of 257 to 298 HV. The mixed mode of quasi-cleavage fracture was obtained with a fracture strength of 687 ± 4&#xa0;MPa and toughness of 45 ± 2&#xa0;J.</p>

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Effect of Niobium Segregation on the Structure–Property Relationship of Alloy 82 by Pulsed WAAM

  • 期刊论文

  • 发表日期：

    2026年2月12日

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  • S. M. Muthu,
  • S. Senthur Prabu,
  • Julia Sebastian,
  • S. Sujai,
  • D. T. Arunkumar,
  • Sabarinathan Palaniappan,
  • K. Jithesh

摘要

Pulsed gas tungsten arc welding-based wire arc additive manufacturing (GTAW–WAAM) was employed to fabricate an Alloy 82 (ERNiCr-03) wall structure with refined grain morphology through suppression of niobium segregation. The investigation on the built-up WAAM structure was analyzed through metallographic and mechanical characterizations. The machined cross section of the Alloy 82 WAAM was examined to investigate metallography studies, which revealed the presence of columnar dendrites in the bottom layer of the deposition. As the deposition layer increased, the occurrence of equiaxed grains was observed. It was noted that there was no solidification cracking during the deposition, but the solidified grain boundaries (SGBs) and migrated grain boundaries (MGBs) were observed despite having a fully γ austenitic matrix. The precipitation of MC carbide and traces of Laves phase were noticed at the bottom region of the WAAM, comparatively less in the top areas. The x-ray diffraction (XRD) peaks indicate the γ-(Ni), γ’-(Ni3Al), γ”-(Ni3Cr), and primary carbide precipitate (NiC) phases, and the WAAM-built Alloy 82 exhibited a hardness range of 257 to 298 HV. The mixed mode of quasi-cleavage fracture was obtained with a fracture strength of 687 ± 4 MPa and toughness of 45 ± 2 J.