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<p>Welding characteristics of lightweight austenitic steels (LWAS) with <i>κ</i>-carbide suppression could broaden their potential structural applications. The present work investigates the gas tungsten arc-welded (GTAW) characteristics of wrought single-phase and recrystallized Fe–30Mn–5Al–1C–3Mo (wt pct) LWAS, correlating the as-weld microstructure with room temperature deformation behaviour. Microstructural evolution is characterised using optical, FESEM, EBSD, and XRD, whilst deformation behaviour is studied by micro- and nano-hardness, along with quasi-static uniaxial tensile tests. The fusion zone showed Mo and Mn-enriched hard dendritic regions, and Fe and Al-enriched soft interdendritic regions, along with Mo-enriched carbides at the interdendrites, which are validated using Scheil solidification analysis. The effective partitioning coefficients of elements present, along with non-equilibrium solidification during welding, led to this microstructural gradient. An increase in weldment’s yield and tensile strengths by ~ 36 and 12.5 pct, with a drop in fracture strain by ~ 26 pct, is attributed to the local strength gradient of the fusion zone with hard (~ 2.7 ± 0.2 GPa) and soft (~ 2.2 ± 0.4 GPa) regions that altered the mean free path of dislocations. Furthermore, a purely ductile fracture, characterized by uniform strain localization through dislocation-assisted slip across the weldment, constrained the fracture to the base metal region.</p>

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Gas Tungsten Arc Welding Characteristics of Fe–30Mn–5Al–1C–3Mo (Wt Pct) Lightweight Austenitic Steel

  • 期刊论文

  • 发表日期：

    2026年7月11日

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  • Kotla Sairam,
  • Ambe Radha,
  • S. Satyanarayana,
  • M. P. Phaniraj,
  • Korla Rajesh

摘要

Welding characteristics of lightweight austenitic steels (LWAS) with κ-carbide suppression could broaden their potential structural applications. The present work investigates the gas tungsten arc-welded (GTAW) characteristics of wrought single-phase and recrystallized Fe–30Mn–5Al–1C–3Mo (wt pct) LWAS, correlating the as-weld microstructure with room temperature deformation behaviour. Microstructural evolution is characterised using optical, FESEM, EBSD, and XRD, whilst deformation behaviour is studied by micro- and nano-hardness, along with quasi-static uniaxial tensile tests. The fusion zone showed Mo and Mn-enriched hard dendritic regions, and Fe and Al-enriched soft interdendritic regions, along with Mo-enriched carbides at the interdendrites, which are validated using Scheil solidification analysis. The effective partitioning coefficients of elements present, along with non-equilibrium solidification during welding, led to this microstructural gradient. An increase in weldment’s yield and tensile strengths by ~ 36 and 12.5 pct, with a drop in fracture strain by ~ 26 pct, is attributed to the local strength gradient of the fusion zone with hard (~ 2.7 ± 0.2 GPa) and soft (~ 2.2 ± 0.4 GPa) regions that altered the mean free path of dislocations. Furthermore, a purely ductile fracture, characterized by uniform strain localization through dislocation-assisted slip across the weldment, constrained the fracture to the base metal region.