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<p>Fe–31Mn–8Al–1.2C low-density (LD) austenitic steel is characterized by high strength, ductility, and weight reduction, making it suitable for mass-efficient applications. In this research work, the influence of laser power (750, 975, 1125 W) on the microstructure and mechanical behavior of autogenous fiber laser-welded joints of LD steel was investigated. The plates were microstructurally conditioned. LOM/SEM analysis revealed dendritic structures in the FZ. The finest FZ/PMZ grains occurred at 975 W (27.9 and 51.5&#xa0;μm), while HAZ/GGZ significant refinement was at 1125 W. Porosities were smaller at 975 W. Vickers profiles exhibited higher hardness in FZ than HAZ. A single-phase γ-austenitic matrix was confirmed by X-ray diffraction, while the presence of low-volume κ-carbides, AlN, and MnS at equilibrium was predicted by JMatPro®. These results highlight the importance of optimizing laser parameters to control weld microstructure and improve mechanical properties.</p> Graphical abstract <p></p>

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Influence of laser power on the microstructure and mechanical properties of the welded joint of Fe–31Mn–8Al–1.2C low-density austenitic steel by autogenous fiber laser welding

  • 期刊论文

  • 发表日期：

    2026年1月21日

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  • C. E. Coronado-Alba,
  • I. Mejía,
  • H. Hernández-Belmontes

摘要

Fe–31Mn–8Al–1.2C low-density (LD) austenitic steel is characterized by high strength, ductility, and weight reduction, making it suitable for mass-efficient applications. In this research work, the influence of laser power (750, 975, 1125 W) on the microstructure and mechanical behavior of autogenous fiber laser-welded joints of LD steel was investigated. The plates were microstructurally conditioned. LOM/SEM analysis revealed dendritic structures in the FZ. The finest FZ/PMZ grains occurred at 975 W (27.9 and 51.5 μm), while HAZ/GGZ significant refinement was at 1125 W. Porosities were smaller at 975 W. Vickers profiles exhibited higher hardness in FZ than HAZ. A single-phase γ-austenitic matrix was confirmed by X-ray diffraction, while the presence of low-volume κ-carbides, AlN, and MnS at equilibrium was predicted by JMatPro®. These results highlight the importance of optimizing laser parameters to control weld microstructure and improve mechanical properties.

Graphical abstract